TM HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 Data Sheet June 2000 File Number Low Power Universal SLIC Family Features The UniSLIC14 is a family of Ultra Low Power SLICs. The feature set and common pinouts of the UniSLIC14 family positions it as a universal solution for: Plain Old Telephone Service (POTS), PBX, Central Office, Loop Carrier, Fiber in the Loop, ISDN-TA and NT1+, Pairgain and Wireless Local Loop. • Ultra Low Active Power (OHT) < 60mW 4659.5 • Single/Dual Battery Operation • Automatic Silent Battery Selection • Power Management/Shutdown • Battery Tracking Anti Clipping The UniSLIC14 family achieves its ultra low power operation through: Its automatic single and dual battery selection (based on line length) and battery tracking anti clipping to ensure the maximum loop coverage on the lowest battery voltage. This architecture is ideal for power critical applications such as ISDN NT1+, Pairgain and Wireless local loop products. • Single 5V Supply with 3V Compatible Logic • Zero Crossing Ring Control - Zero Voltage On/Zero Current Off • Tip/Ring Disconnect • Pulse Metering Capability • 4 Wire Loopback The UniSLIC14 family has many user programmable features. This family of SLICs delivers a low noise, low component count solution for Central Office and Loop Carrier universal voice grade designs. The product family integrates advanced pulse metering, test and signaling capabilities, and zero crossing ring control. • Programmable Current Feed The UniSLIC14 family is designed in the Intersil “Latch” free Bonded Wafer process. This process dielectrically isolates the active circuitry to eliminate any leakage paths as found in our competition’s JI process. This makes the UniSLIC14 family compliant with “hot plug” requirements and operation in harsh outdoor environments. • Selectable Transmit Gain 0dB/-6dB TRLY1 STATE DECODER AND DETECTOR LOGIC RING AND TEST RELAY DRIVERS TRLY2 DT DR ZERO CURRENT CROSSING RING TRIP DETECTOR LOOP CURRENT DETECTOR GKD/LOOP LENGTH DETECTOR LINE FEED CONTROL 2-WIRE RING BGND AGND INTERFACE 4-WIRE INTERFACE VF SIGNAL PATH VBH VBL VCC C1 C2 C3 C4 C5 SHD GKD_LVM CRT_REV_LVM POLARITY REVERSAL TIP • Programmable Loop Detect Threshold • Programmable On-Hook and Off-Hook Overheads • Programmable Overhead for Pulse Metering • Programmable Polarity Reversal Time • 2 Wire Impedance Set by Single Network • Loop and Ground Key Detectors • On-Hook Transmission • Common Pinout • HC55121 - Polarity Reversal Block Diagram RRLY • Programmable Resistive Feed BATTERY SELECTION AND BIAS NETWORK PULSE METERING SIGNAL PATH ILIM RSYNC_REV ROH CDC RDC_RAC RD VTX VRX PTG ZT CH • HC55130 - -63dB Longitudinal Balance • HC55140 - Polarity Reversal - Ground Start - Line Voltage Measurement - 2 Wire Loopback - -63dB Longitudinal Balance • HC55142 - Polarity Reversal - Ground Start - Line Voltage Measurement - 2.2VRMS Pulse Metering - 2 Wire Loopback • HC55150 - Polarity Reversal - Line Voltage Measurement - 2.2VRMS Pulse Metering - 2 Wire Loopback Applications • Related Literature - AN9871, User’s Guide for UniSLIC14 Eval Board SPM 4-1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil and Design is a trademark of Intersil Corporation. | Copyright © Intersil Corporation 2000 HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 Ordering Information MAX LOOP CURRENT (mA) PART NUMBER POLARITY REVERSAL GND START GND KEY LINE VOLTAGE MEASUREMENT † 2 TEST PULSE RELAY METERING DRIVERS 2 WIRE LOOPBACK † TEMP LONGITUDINAL RANGE BALANCE (oC) PKG. NO. HC55120CB 30 • 53dB 0 to 70 M28.3 SOIC HC55120CM 30 • 53dB 0 to 70 N28.45 PLCC HC55121IB 30 • • • • 53dB -40 to 85 M28.3 SOIC HC55121IM 30 • • • • 53dB -40 to 85 N28.45 PLCC HC55130IB 45 63dB -40 to 85 M28.3 SOIC HC55130IM 45 63dB -40 to 85 N28.45 PLCC HC55131IM 45 63dB -40 to 85 N32.45x55 PLCC HC55140IB 45 • • • • • 63dB -40 to 85 M28.3 SOIC HC55140IM 45 • • • • • 63dB -40 to 85 N28.45 PLCC HC55141IM 45 • • • • • 63dB -40 to 85 N32.45x55 PLCC HC55142IB 45 • • • • • • 63dB -40 to 85 M28.3 SOIC HC55142IM 45 • • • • • • 63dB -40 to 85 N28.45 PLCC HC55143IM 45 • • • • • • 63dB -40 to 85 N32.45x55 PLCC HC55150CB 45 • • • • 55dB 0 to 70 M28.3 SOIC HC55150CM 45 • • • • 55dB 0 to 70 N28.45 PLCC HC55151CM 45 • • • • 55dB 0 to 70 N32.45x55 PLCC • • • • HC5514XEVAL1 Evaluation board † Available by placing SLIC in Test mode. Device Operating Modes C3 C2 C1 0 0 0 0 0 0 0 DESCRIPTION HC55120 HC55121 HC55130/1 HC55140/1 HC55142/3 HC55150/1 Open Circuit 4-Wire Loopback • • • • • • 1 Ringing • • • • • • 1 0 Forward Active • • • • • • 1 1 Test Forward Active 2 Wire Loopback and Line Voltage Measurement • • • 1 0 0 Tip Open Ground Start • • 1 0 1 Reserved • • • 1 1 0 Reverse Active • • • 1 1 1 Test Reverse Active Line Voltage Measurement • • • 4-2 • • • • • HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 Absolute Maximum Ratings TA = 25oC Thermal Information Temperature, Humidity Storage Temperature Range . . . . . . . . . . . . . . . . -65oC to 150oC Operating Temperature Range. . . . . . . . . . . . . . . -40oC to 110oC Operating Junction Temperature Range. . . . . . . . -40oC to 150oC Power Supply (-40oC ≤ TA ≤ 85oC) Supply Voltage VCC to GND . . . . . . . . . . . . . . . . . . . . -0.4V to 7V Supply Voltage VBL to GND . . . . . . . . . . . . . . . . . . . .-VBH to 0.4V Supply Voltage VBH to GND, Continuous. . . . . . . . . . -75V to 0.4V Supply Voltage VBH to GND, 10ms . . . . . . . . . . . . . . -80V to 0.4V Relay Driver Ring Relay Supply Voltage . . . . . . . . . . . . . . . . . . . . . . 0V to 14V Ring Relay Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50mA Digital Inputs, Outputs (C1, C2, C3, C4, C5, SHD, GKD_LVM) Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.4V to VCC Output Voltage (SHD, GKD_LVM Not Active). . . . . . -0.4V to VCC Output Current (SHD, GKD_LVM) . . . . . . . . . . . . . . . . . . . . . 5mA ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .500V Gate Count. . . . . . . . . . . . . . . . . . . . . . . .543 Transistors, 51 Diodes Tipx and Ringx Terminals (-40oC ≤ TA ≤ 85oC) Tipx or Ringx Current . . . . . . . . . . . . . . . . . . . . -100mA to 100mA Thermal Resistance (Typical, Note 1) θJA 28 Lead PLCC Package. . . . . . . . . . . . . . . . . . . . . . 52oC/W 28 Lead SOIC Package . . . . . . . . . . . . . . . . . . . . . . 45oC/W 32 Lead PLCC Package. . . . . . . . . . . . . . . . . . . . . . 66.2oC/W Continuous Power Dissipation at 85oC 28 Lead PLCC Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.5W 28 Lead SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.0W 32 Lead PLCC Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.4W Lead Temperature (Soldering 10s) . . . . . . . . . . . . . . . . . . . . . . . . 300oC (PLCC, SOIC - Lead Tips Only) Derate above 70oC Tip and Ring Terminals Tipx or Ringx, Current, Pulse < 10ms, TREP > 10s . . . . . . . . . .2A Tipx or Ringx, Current, Pulse < 1ms, TREP > 10s . . . . . . . . . . .5A Tipx or Ringx, Current, Pulse < 10µs, TREP > 10s . . . . . . . . .15A Tipx or Ringx, Current, Pulse < 1µs, TREP > 10s . . . . . . . . . .20A Tipx or Ringx, Pulse < 250ns, TREP > 10s 20A CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. NOTE: 1. θJA is measured with the component mounted on an evaluation PC board in free air. Typical Operating Conditions These represent the conditions under which the device was developed and are suggested as guidelines. PARAMETER MIN TYP MAX UNITS 0 - 70 oC -40 - 85 oC VBH with Respect to GND -58 - -8 V VBL with Respect to GND VBH - 0 V VCC with Respect to GND 4.75 - 5.25 V Ambient Temperature CONDITIONS HC55120, HC55150/1 HC55121, HC55130/1, HC55140/1, HC55142/3 4-3 PARAMETER TEST CONDITIONS MIN TYP MAX UNITS HC55120 HC55121 HC55130/1 HC55140/1 HC55142/3 HC55150/1 2-WIRE PORT 4-4 Overload Level, Off Hook Forward and Reverse 1% THD, IDCMET ≥ 18mA (Note 2, Figure 1) 3.2 - - VPEAK Forward Only • Forward Only • • • Overload Level, On Hook Forward and Reverse 1% THD, IDCMET ≤ 5mA (Note 3, Figure 1) 1.3 - - VPEAK Forward Only • Forward Only • • • Input Impedance (Into Tip and Ring) - ZT /200 - Ω • • • • • • Longitudinal Impedance (Tip, Ring) 0 < f < 100Hz (Note 4, Figure 2) Forward and Reverse - 0 - Ω/Wire Forward Only • Forward Only • • • 28 - - mARMS/Wire Forward Only • Forward Only • • • LONGITUDINAL CURRENT LIMIT (TIP, RING) On-Hook, Off-Hook (Active), RL = 736Ω Forward and Reverse No False Detections, (Loop Current), LB > 45dB (Notes 5, 6, Figures 3A, 3B) TIP AT 1VRMS VTX 0 < f < 100Hz EL C VTR TIP VTX RING VRX VT 300Ω RL 300Ω IDCMET ERX RING VR AR VRX LZT = VT/AT FIGURE 2. LONGITUDINAL IMPEDANCE FIGURE 1. OVERLOAD LEVEL (OFF HOOK, ON HOOK) 368Ω 368Ω A 10µF LZR = VR/AR VTX TIP A C TIP VTX VTX C EL EL 10µF C A RING VRX 368Ω SHD FIGURE 3A. LONGITUDINAL CURRENT LIMIT ON-HOOK (ACTIVE) A RING 368Ω VRX SHD FIGURE 3B. LONGITUDINAL CURRENT LIMIT OFF-HOOK (ACTIVE) HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 TA = -40oC to 85oC, VCC = +5V ±5%, VBH = -48V, VBL = -24V, PTG = Open, RP1 = RP2 = 0Ω, ZT = 120kΩ, RLIM = 38.3kΩ, RD = 50kΩ, RDC_RAC = 20kΩ, ROH = 40kΩ, CH = 0.1µF, CDC = 4.7µF, CRT/REV = 0.47µF, GND = 0V, RL = 600Ω. Unless Otherwise Specified. (•) Symbol used to indicate the test applies to the part. (NA) symbol used to indicate the test does not apply to the part. Electrical Specifications TA = -40oC to 85oC, VCC = +5V ±5%, VBH = -48V, VBL = -24V, PTG = Open, RP1 = RP2 = 0Ω, ZT = 120kΩ, RLIM = 38.3kΩ, RD = 50kΩ, RDC_RAC = 20kΩ, ROH = 40kΩ, CH = 0.1µF, CDC = 4.7µF, CRT/REV = 0.47µF, GND = 0V, RL = 600Ω. Unless Otherwise Specified. (•) Symbol used to indicate the test applies to the part. (NA) symbol used to indicate the test does not apply to the part. (Continued) PARAMETER TEST CONDITIONS MIN TYP MAX UNITS HC55120 HC55121 MIN MIN HC55130/1 HC55140/1 HC55142/3 HC55150/1 OFF-HOOK LONGITUDINAL BALANCE Longitudinal to Metallic (Note 7) Forward and Reverse 4-5 Longitudinal to Metallic (Note 7) Forward and Reverse Longitudinal to 4-Wire (Note 9) (Forward and Reverse) IEEE 455 - 1985, RLR, RLT = 368Ω Normal Polarity: Forward Only MIN MIN MIN MIN 55 Forward Only 0.2kHz < f < 1.0kHz, 0oC to 70oC - - - dB 53 NA NA NA NA 1.0kHz < f < 3.4kHz, 0oC to 70oC - - - dB 53 NA NA NA NA 55 0.2kHz < f < 1.0kHz, -40oC to 85oC - - - dB NA 53 63 63 63 NA 1.0kHz < f < 3.4kHz, -40oC to 85oC - - - dB NA 53 58 58 58 NA Reverse Polarity 0.2kHz < f < 3.4kHz, (Figure 4) - - - dB NA 53 NA 58 58 55 MIN MIN MIN MIN MIN MIN 55 RLR, RLT = 300Ω, Normal Polarity: Forward Only Forward Only 0.2kHz < f < 1.0kHz, 0oC to 70oC - - - dB 53 NA NA NA NA 1.0kHz < f < 3.4kHz, 0oC to 70oC - - - dB 53 NA NA NA NA 55 0.2kHz < f < 1.0kHz, -40oC to 85oC - - - dB NA 53 63 63 63 NA 1.0kHz < f < 3.4kHz, -40oC to 85oC - - - dB NA 53 58 58 58 NA Reverse Polarity 0.2kHz < f < 3.4kHz, (Figure 4) - - - dB NA 53 NA 58 58 55 MIN MIN MIN MIN MIN MIN 61 Normal Polarity: Forward Only 0.2kHz < f < 1.0kHz, 0oC to 70oC - - - dB 1.0kHz < f < 3.4kHz, 0oC to 70oC 0.2kHz < f < 1.0kHz, -40oC to 85oC 1.0kHz < f < 3.4kHz, -40oC to 85oC - - - - - - - - - Reverse Polarity 0.2kHz < f < 3.4kHz, (Figure 4) - - Forward Only 53 NA NA NA NA dB 53 NA NA NA NA 61 dB NA 53 63 63 63 NA dB NA 53 58 58 58 NA dB NA 53 NA 58 58 61 Metallic to Longitudinal (Note 10) Forward and Reverse FCC Part 68, Para 68.310 (Note 8) 0.2kHz < f < 3.4kHz, (Figure 5) 40 50 - dB Forward Only • Forward Only • • • 4-Wire to Longitudinal (Note 11) Forward and Reverse 0.2kHz < f < 3.4kHz, (Figure 5) 40 - - dB Forward Only • Forward Only • • • HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 Electrical Specifications PARAMETER TEST CONDITIONS MIN TYP MAX UNITS HC55120 RLT TIP EL HC55121 HC55130/1 HC55140/1 HC55142/3 HC55150/1 RLT 300Ω VTX C VTX TIP VTX 2.16µF ETR VTR ERX C 2.16µF 4-6 VL RING RLR VRX RLR 300Ω FIGURE 4. LONGITUDINAL TO METALLIC AND LONGITUDINAL TO 4-WIRE BALANCE 2-Wire Return Loss Forward and Reverse VRX RING FIGURE 5. METALLIC TO LONGITUDINAL AND 4-WIRE TO LONGITUDINAL BALANCE 0.2kHz to 1.0kHz (Note 12, Figure 6) 30 35 - dB 1.0kHz to 3kHz (Note 12, Figure 6) 23 25 - dB Forward Only 3kHz to 3.4kHz (Note 12, Figure 6) 21 23 - dB -2.6 -2.2 -1.8 V Forward Only • Active, IL < 5mA -46.4 -45.3 -44.2 V Tip open, IL < 5mA -46.4 -45.3 -44.2 V Forward Only • Forward Only • • • Forward Only • • • • Forward Only • • • TIP IDLE VOLTAGE (User Programmable) TIPX Idle Voltage Active, IL < 5mA Forward and Reverse RING IDLE VOLTAGE (User Programmable) RINGX Idle Voltage Forward and Reverse VTR Forward and Reverse Active, IL < 5mA 41 43.1 45 V Forward Only • Forward Only • • • VTR(ROH) Pulse Metering Forward and Reverse Active, IL≥ 8.5mA, ROH = 50kΩ 36 38.1 - V NA • NA NA • • ZD TIP R TIP VTX VTX VTR VM 600Ω VS R VTX EG ZL RL ZIN RING VRX RING VRX RLR FIGURE 6. TWO-WIRE RETURN LOSS FIGURE 7. OVERLOAD LEVEL (4-WIRE TRANSMIT PORT), OUTPUT OFFSET VOLTAGE AND HARMONIC DISTORTION HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 TA = -40oC to 85oC, VCC = +5V ±5%, VBH = -48V, VBL = -24V, PTG = Open, RP1 = RP2 = 0Ω, ZT = 120kΩ, RLIM = 38.3kΩ, RD = 50kΩ, RDC_RAC = 20kΩ, ROH = 40kΩ, CH = 0.1µF, CDC = 4.7µF, CRT/REV = 0.47µF, GND = 0V, RL = 600Ω. Unless Otherwise Specified. (•) Symbol used to indicate the test applies to the part. (NA) symbol used to indicate the test does not apply to the part. (Continued) Electrical Specifications TA = -40oC to 85oC, VCC = +5V ±5%, VBH = -48V, VBL = -24V, PTG = Open, RP1 = RP2 = 0Ω, ZT = 120kΩ, RLIM = 38.3kΩ, RD = 50kΩ, RDC_RAC = 20kΩ, ROH = 40kΩ, CH = 0.1µF, CDC = 4.7µF, CRT/REV = 0.47µF, GND = 0V, RL = 600Ω. Unless Otherwise Specified. (•) Symbol used to indicate the test applies to the part. (NA) symbol used to indicate the test does not apply to the part. (Continued) PARAMETER TEST CONDITIONS MIN TYP MAX UNITS HC55120 HC55121 HC55130/1 HC55140/1 HC55142/3 HC55150/1 Overload Level, Off Hook (IL≥ 18mA) (ZL > 20kΩ, IL 1% THD) (Note 13, Forward and Reverse Figure 7) TA = 0oC to 85oC TA = -40oC to 0oC 3.2 - - VPEAK Forward Only • Forward Only • • • 3.0 - - VPEAK Overload Level, On Hook (IL ≤ 5mA) (ZL > 20kΩ, 1% THD) Forward and Reverse (Note 14, Figure 7) 1.3 - - VPEAK Forward Only • Forward Only • • • -200 - 200 mV Forward Only • Forward Only • • • • • • • • • • • • • • • • • • • • • • • • 4-WIRE TRANSMIT PORT (VTX) 4-7 VTX Output Offset Voltage Forward and Reverse EG = 0, ZL = ∞, (Note 15, Figure 7) Output Impedance (Guaranteed by Design) 0.2kHz < f < 03.4kHz - 0.1 1 Ω 0.2kHz < f < 3.4kHz - 500 600 kΩ 4-WIRE RECEIVE PORT (VRX) VRX Input Impedance (Guaranteed by Design) FREQUENCY RESPONSE (OFF-HOOK) 2-Wire to 4-Wire Forward and Reverse Relative to 0dBm at 1.0kHz, ERX = 0V 0.3kHz < f < 3.4kHz 4-Wire to 2-Wire Forward and Reverse 4-Wire to 4-Wire Forward and Reverse -0.15 - 0.15 dB f = 8.0kHz (Note 16, Figure 8) - 0.24 0.5 dB f = 12kHz (Note 16, Figure 8) - 0.58 1.0 dB f = 16kHz (Note 16, Figure 8) - 1.0 1.5 dB Relative to 0dBm at 1.0kHz, EG = 0V 0.3kHz < f < 3.4kHz -0.15 - 0.15 dB f = 8kHz (Note 17, Figure 8) -0.5 0.24 - dB f = 12kHz (Note 17, Figure 8) -1.0 0.58 - dB f = 16kHz (Note 17, Figure 8) -1.5 1.0 - dB 0.3kHz < f < 3.4kHz (Note 18, Figure 8) -0.15 - 0.15 dB 8kHz, 12kHz, 16kHz (Note 18, Figure 8) 0 0.5 dB Relative to 0dBm at 1.0kHz, EG = 0V TIP -0.5 Forward Only Forward Only • Forward Only Forward Only • Forward Only Forward Only • VTX TIP VTX VTX VTX EG RL 600Ω OPEN VTR PTG RL 600Ω VTR ERX RING VRX FIGURE 8. FREQUENCY RESPONSE, INSERTION LOSS, GAIN TRACKING AND HARMONIC DISTORTION RING VRX FIGURE 9. IDLE CHANNEL NOISE HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 Electrical Specifications TA = -40oC to 85oC, VCC = +5V ±5%, VBH = -48V, VBL = -24V, PTG = Open, RP1 = RP2 = 0Ω, ZT = 120kΩ, RLIM = 38.3kΩ, RD = 50kΩ, RDC_RAC = 20kΩ, ROH = 40kΩ, CH = 0.1µF, CDC = 4.7µF, CRT/REV = 0.47µF, GND = 0V, RL = 600Ω. Unless Otherwise Specified. (•) Symbol used to indicate the test applies to the part. (NA) symbol used to indicate the test does not apply to the part. (Continued) PARAMETER TEST CONDITIONS MIN TYP MAX UNITS HC55120 HC55121 HC55130/1 HC55140/1 HC55142/3 HC55150/1 Forward Only • Forward Only • • • INSERTION LOSS 2-Wire to 4-Wire Forward and Reverse 0dBm, 1kHz 4-8 4-Wire to 2-Wire Forward and Reverse PTG = Open (Note 19, Figure 8) -0.2 - 0.2 dB PTG = GND (Note 20, Figure 8) -6.22 -6.02 -5.82 dB 0dBm, 1kHz (Note 21, Figure 8) -0.2 - 0.2 dB Forward Only • Forward Only • • • Forward Only • Forward Only • • • Forward Only • Forward Only • • • Forward Only • Forward Only • • • Forward Only • Forward Only • • • GAIN TRACKING (Ref = -10dBm, at 1.0kHz) 2-Wire to 4-Wire Forward and Reverse 4-Wire to 2-Wire Forward and Reverse -40dBm to +3dBm (Note 22, Figure 8) -0.1 - 0.1 dB -55dBm to -40dBm (Note 22, Figure 8) -0.2 - 0.2 dB -40dBm to +3dBm (Note 23, Figure 8) -0.1 - 0.1 dB -55dBm to -40dBm (Note 23, Figure 8) -0.2 - 0.2 dB NOISE Idle Channel Noise at 2-Wire C-Message Weighting - 10.5 13 dBrnC Forward and Reverse Psophometric Weighting (Note 24, Note 30, Figure 9) - -79.5 -77 dBmp Idle Channel Noise at 4-Wire C-Message Weighting - 10.5 13 dBrnC Forward and Reverse Psophometrical Weighting (Note 25, Note 30, Figure 9) - -79.5 -77 dBmp 2-Wire to 4-Wire Forward and Reverse 0dBm, 0.3kHz to 3.4kHz (Note 26, Figure 7) - -67 -50 dB Forward Only • Forward Only • • • 4-Wire to 2-Wire Forward and Reverse 0dBm, 0.3kHz to 3.4kHz (Note 27, Figure 8) - -67 -50 dB Forward Only • Forward Only • • • HARMONIC DISTORTION TIP VBH VTX 7kΩ TIP VTX RING VRX S RL 600Ω RLIM RLIM 38.3kΩ VTR IR1 R1 RING VRX FIGURE 10. CONSTANT LOOP CURRENT TOLERANCE FIGURE 11. TIPX VOLTAGE HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 Electrical Specifications TA = -40oC to 85oC, VCC = +5V ±5%, VBH = -48V, VBL = -24V, PTG = Open, RP1 = RP2 = 0Ω, ZT = 120kΩ, RLIM = 38.3kΩ, RD = 50kΩ, RDC_RAC = 20kΩ, ROH = 40kΩ, CH = 0.1µF, CDC = 4.7µF, CRT/REV = 0.47µF, GND = 0V, RL = 600Ω. Unless Otherwise Specified. (•) Symbol used to indicate the test applies to the part. (NA) symbol used to indicate the test does not apply to the part. (Continued) PARAMETER TEST CONDITIONS MIN TYP MAX UNITS HC55120 HC55121 HC55130/1 HC55140/1 HC55142/3 HC55150/1 0.92IL IL 1.08IL mA Forward Only • Forward Only • • • - - -200 µA • • • • • • • • • • • • • • • BATTERY FEED CHARACTERISTICS 4-9 Constant Loop Current Tolerance 18mA ≤ IL ≤ 45mA, IL = 26.5mA, RLIM = 38.3kΩ Forward and Reverse (Note 27, Figure 10) Tip Open State TIPX Leakage Current S = Closed (Figure 11) Tip Open State RINGX Current R1 = 0Ω, VBH = -48V, RLIM = 38.3kΩ 22.6 26.8 31 mA R1 = 2.5kΩ, VBH = -48V (Figure 11) 15.5 17.1 18.2 mA - 42.8 - V • • • -5.3 -4.8 -4.3 V NA NA NA • • NA -48V Through 7kΩ, Ring Lead to Ground Through 150Ω (Figure 11) -5.3 -4.8 -4.3 V NA NA NA • • NA (Active) RL = 0Ω -20 0 20 µA • • • • • • 0.9ILTh ILTh 1.1ILTh mA Forward Only • • • • • Tip Open State RINGX Voltage 5mA < IR1 < 26mA (Figure 11) Tip Voltage (Ground Start) Active State, (S Open) R1 = 150Ω (Figure 11) Tip Voltage (Ground Start) Active State, (S Closed) Tip Lead to Open Circuit State Loop Current LOOP CURRENT DETECTOR Programmable Threshold ILTh = (500/ RD) ≥ 5mA, Forward and Reverse ILTh = 8.5mA • Forward Only RD = 58.8kΩ GROUND KEY DETECTOR Ground Key Detector Threshold Tip/Ring Current Difference Tip Open 5 8 11 mA Active (Note 29, R1 = 2.5kΩ, Figure 12) 12.5 20 27.5 mA Pulse Width = (20)(CREV.../ILIM) 0.32 0.36 0.4 NA NA • • ms/V NA NA NA • • • • • • • • • • • • • • • LINE VOLTAGE MEASUREMENT Pulse Width (GKD_LVM) RING TRIP DETECTOR (DT, DR) Ring Trip Comparator Current Source Res = 2MΩ - 2 - µA Input Common-Mode Range Source Res = 2MΩ - - ±200 V HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 Electrical Specifications TA = -40oC to 85oC, VCC = +5V ±5%, VBH = -48V, VBL = -24V, PTG = Open, RP1 = RP2 = 0Ω, ZT = 120kΩ, RLIM = 38.3kΩ, RD = 50kΩ, RDC_RAC = 20kΩ, ROH = 40kΩ, CH = 0.1µF, CDC = 4.7µF, CRT/REV = 0.47µF, GND = 0V, RL = 600Ω. Unless Otherwise Specified. (•) Symbol used to indicate the test applies to the part. (NA) symbol used to indicate the test does not apply to the part. (Continued) PARAMETER TEST CONDITIONS MIN TYP MAX UNITS HC55120 HC55121 HC55130/1 HC55140/1 HC55142/3 HC55150/1 • • • • • • • • • • • • • • • RING RELAY DRIVER VSAT at 30mA IOL = 30mA - 0.2 0.5 V VSAT at 40mA IOL = 40mA - 0.52 0.8 V Off State Leakage Current VOH = 13.2V - 0.1 10 µA • • • 4-10 TEST RELAY DRIVER (TRLY1, TRLY2) VSAT at 30mA IOL = 30mA - 0.3 0.5 V NA NA NA/• NA/• NA/• NA/• VSAT at 40mA IOL = 40mA - 0.62 0.9 V NA NA NA/• NA/• NA/• NA/• Off State Leakage Current VOH = 13.2V - - 10 µA NA NA NA/• NA/• NA/• NA/• • • • • • • • • • • • • • • • • • • • • • • • • TIP VTX VRX RING 2.5kΩ SHD FIGURE 12. GROUND KEY DETECT DIGITAL INPUTS (C1, C2, C3) Input Low Voltage, VIL 0 - 0.8 V Input High Voltage, VIH 2.0 - VCC V Input Low Current, IIL VIL = 0.4V - - -10 µA Input High Current, IIH VIH = 2.5V - 25 50 µA - - 0.5 V Forward Only • Forward Only • • • 2.7 - - V Forward Only • Forward Only • • • - - 0.5 V GKD GKD NA GKD_ LVM GKD_ LVM LVM 2.7 - - V GKD GKD NA GKD_ LVM GKD_ LVM LVM - 15 - kΩ • • • • • • DETECTOR OUTPUTS (SHD, GKD_LVM) SHD Output Low Voltage, VOL Forward, Reverse IOL = 1mA SHD Output High Voltage, VOH Forward, Reverse IOH = 100µA GKD_LVM Output Low Voltage, VOL Forward and Tip Open IOL = 1mA R1 = 2.5kΩ (Figure 11) GKD_LVM Output High Voltage, VOH Forward and Tip Open IOH = 100µA Internal Pull-Up Resistor HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 Electrical Specifications TA = -40oC to 85oC, VCC = +5V ±5%, VBH = -48V, VBL = -24V, PTG = Open, RP1 = RP2 = 0Ω, ZT = 120kΩ, RLIM = 38.3kΩ, RD = 50kΩ, RDC_RAC = 20kΩ, ROH = 40kΩ, CH = 0.1µF, CDC = 4.7µF, CRT/REV = 0.47µF, GND = 0V, RL = 600Ω. Unless Otherwise Specified. (•) Symbol used to indicate the test applies to the part. (NA) symbol used to indicate the test does not apply to the part. (Continued) PARAMETER TEST CONDITIONS MIN TYP MAX UNITS HC55120 HC55121 - 25 - mW Forward Only • HC55130/1 HC55140/1 HC55142/3 HC55150/1 POWER DISSIPATION (VBH = -48V, VBL = -24V) 4-11 Open Circuit State C1, C2, C3 = 0, 0, 0 On-Hook, Active C1, C2, C3 = 0, 1, 0 C1, C2, C3 = 1, 1, 0 Forward and Reverse IL = 0mA, Longitudinal Current = 0mA Forward Only • • • • • • • - 52 - mW Forward Only • Forward Only • • • - 2.25 3.0 mA Forward Only • Forward Only • • • VBH Current, IBH - 0.3 0.45 mA Forward Only • Forward Only • • • VBL Current, IBL - 0.022 0.035 mA Forward Only • Forward Only • • • - 2.7 3.6 mA Forward Only • Forward Only • • • - 0.8 1.06 mA Forward Only • Forward Only • • • - - 0.01 mA Forward Only • Forward Only • • • - 40 - dB Forward Only • Forward Only • • • VBH to 2 or 4 Wire Port Forward and Reverse - 40 - dB Forward Only • Forward Only • • • VBL to 2 or 4 Wire Port Forward and Reverse - 40 - dB Forward Only • Forward Only • • • - 175 - oC • • • • • • POWER SUPPLY CURRENTS (VBH = -48V, VBL = -24V) VCC Current, ICC VCC Current, ICC Forward and Reverse VBH Current, IBH Forward and Reverse Open Circuit State Active State IL = 0mA, Longitudinal Current = 0mA VBL Current, IBL Forward and Reverse POWER SUPPLY REJECTION RATIOS VCC to 2 or 4 Wire Port Forward and Reverse Active State RL = 600Ω 50Hz < f < 3400Hz, VIN =100mV TEMPERATURE GUARD Junction Threshold Temperature HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 Electrical Specifications HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 Notes 2. Overload Level (Two-Wire Port, Off Hook) - The overload level is specified at the 2-wire port (VTR) with the signal source at the 4-wire receive port (ERX). RL = 600Ω, IDCMET ≥ 18mA. Increase the amplitude of ERX until 1% THD is measured at VTR. Reference Figure 1. 3. Overload Level (Two-Wire Port, On Hook) - The overload level is specified at the 2-wire port (VTR) with the signal source at the 4-wire receive port (ERX). RL = ∞, IDCMET = 0mA. Increase the amplitude of ERX until 1% THD is measured at VTR. Reference Figure 1. 4. Longitudinal Impedance - The longitudinal impedance is computed using the following equations, where TIP and RING voltages are referenced to ground. LZT, LZR, VT, VR, AR and AT are defined in Figure 2. (TIP) LZT = VT /AT (RING) LZR = VR /AR where: EL = 1VRMS (0Hz to 100Hz) 5. Longitudinal Current Limit (On-Hook Active) - On-Hook longitudinal current limit is determined by increasing the (60Hz) amplitude of EL (Figure 3A) until the 2-wire longitudinal current is greater than 28mARMS/Wire. Under this condition, SHD pin remains low (no false detection) and the 2-wire to 4-wire longitudinal balance is verified to be greater than 45dB (LB2-4 = 20log VTX/EL). 6. Longitudinal Current Limit (Off-Hook Active) - Off-Hook longitudinal current limit is determined by increasing the (60Hz) amplitude of EL (Figure 3B) until the 2-wire longitudinal current is greater than 28mARMS/Wire. Under this condition, SHD pin remains high (no false detection) and the 2-wire to 4-wire longitudinal balance is verified to be greater than 45dB (LB2-4 = 20log VTX/EL). 7. Longitudinal to Metallic Balance - The longitudinal to metallic balance is computed using the following equation: BLME = 20 log (EL /VTR), where: EL and VTR are defined in Figure 4. 8. Metallic to Longitudinal FCC Part 68, Para 68.310 - The metallic to longitudinal balance is defined in this spec. 9. Longitudinal to Four-Wire Balance - The longitudinal to 4-wire balance is computed using the following equation: BLFE = 20 log (EL /VTX), EL and VTX are defined in Figure 4. 10. Metallic to Longitudinal Balance - The metallic to longitudinal balance is computed using the following equation: BMLE = 20 log (ETR /VL), ERX = 0 where: ETR, VL and ERX are defined in Figure 5. 11. Four-Wire to Longitudinal Balance - The 4-wire to longitudinal balance is computed using the following equation: BFLE = 20 log (ERX /VL), ETR = source is removed. where: ERX, VL and ETR are defined in Figure 5. 12. Two-Wire Return Loss - The 2-wire return loss is computed using the following equation: r = -20 log (2VM /VS) where: ZD = The desired impedance; e.g., the characteristic impedance of the line, nominally 600Ω. (Reference Figure 6). 13. Overload Level (4-Wire Port Off-Hook) - The overload level is specified at the 4-wire transmit port (VTX) with the signal source (EG) at the 2-wire port, ZL = 20kΩ, RL = 600Ω (Reference Figure 7). Increase the amplitude of EG until 1% THD is measured at VTX. Note the PTG pin is open, and the gain from the 2-wire port to the 4-wire port is equal to 1. 14. Overload Level (4-Wire Port On-Hook) - The overload level is specified at the 4-wire transmit port (VTX) with the signal source (EG) at the 2-wire port, ZL = 20kΩ, RL = ∞ (Reference Figure 7). Increase the amplitude of EG until 1% THD is measured at VTX. Note the PTG pin is open, and the gain from the 2-wire port to the 4-wire port is equal to 1. 15. Output Offset Voltage - The output offset voltage is specified with the following conditions: EG = 0, RL = 600Ω, ZL = ∞ and is measured at VTX. EG, RL, VTX and ZL are defined in Figure 7. 16. Two-Wire to Four-Wire Frequency Response - The 2-wire to 4-wire frequency response is measured with respect to EG = 0dBm at 1.0kHz, ERX = 0V (VRX input floating), RL = 600Ω. The frequency response is computed using the following equation: F2-4 = 20 log (VTX /VTR), vary frequency from 300Hz to 3.4kHz and compare to 1kHz reading. VTX, VTR, RL and EG are defined in Figure 8. 17. Four-Wire to Two-Wire Frequency Response - The 4-wire to 2wire frequency response is measured with respect to ERX = 0dBm at 1.0kHz, EG source removed from circuit, RL = 600Ω. The frequency response is computed using the following equation: F4-2 = 20 log (VTR /ERX), vary frequency from 300Hz to 3.4kHz and compare to 1kHz reading. VTR, RL and ERX are defined in Figure 8. 18. Four-Wire to Four-Wire Frequency Response - The 4-wire to 4-wire frequency response is measured with respect to ERX = 0dBm at 1.0kHz, EG source removed from circuit, RL = 600Ω. The frequency response is computed using the following equation: F4-4 = 20 log (VTX /ERX), vary frequency from 300Hz to 3.4kHz and compare to 1kHz reading. VTX , RL and ERX are defined in Figure 8. 19. Two-Wire to Four-Wire Insertion Loss (PTG = Open) - The 2-wire to 4-wire insertion loss is measured with respect to EG = 0dBm at 1.0kHz input signal, ERX = 0 (VRX input floating), RL = 600Ω and is computed using the following equation: L2-4 = 20 log (VTX /VTR) where: VTX, VTR, RL and EG are defined in Figure 8. (Note: The fuse resistors, RF, impact the insertion loss. The specified insertion loss is for RF1 = RF2 = 0). 20. Two-Wire to Four-Wire Insertion Loss (PTG = AGND) - The 2-wire to 4-wire insertion loss is measured with respect to EG = 0dBm at 1.0kHz input signal, ERX = 0 (VRX input floating), RL = 600Ω and is computed using the following equation: L2-4 = 20 log (VTX /VTR) where: VTX, VTR, RL and EG are defined in Figure 8. (Note: The fuse resistors, RF, impact the insertion loss. The specified insertion loss is for RF1 = RF2 = 0). 21. Four-Wire to Two-Wire Insertion Loss - The 4-wire to 2-wire insertion loss is measured based upon ERX = 0dBm, 1.0kHz input signal, EG source removed from circuit, RL = 600Ω and is computed using the following equation: L4-2 = 20 log (VTR /ERX) where: VTR, RL and ERX are defined in Figure 8. 22. Two-Wire to Four-Wire Gain Tracking - The 2-wire to 4-wire gain tracking is referenced to measurements taken for EG = -10dBm, 1.0kHz signal, ERX = 0 (VRX output floating), RL = 600Ω and is computed using the following equation. G2-4 = 20 • log (VTX /VTR) vary amplitude -40dBm to +3dBm, or -55dBm to -40dBm and compare to -10dBm reading. VTX, RL and VTR are defined in Figure 8. 4-12 HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 23. Four-Wire to Two-Wire Gain Tracking - The 4-wire to 2-wire gain tracking is referenced to measurements taken for ERX = -10dBm, 1.0kHz signal, EG source removed from circuit, RL = 600Ω and is computed using the following equation: G4-2 = 20 • log (VTR /ERX) vary amplitude -40dBm to +3dBm, or -55dBm to -40dBm and compare to -10dBm reading. VTR, RL and ERX are defined in Figure 8. The level is specified at the 4-wire receive port and referenced to a 600Ω impedance level. 24. Two-Wire Idle Channel Noise - The 2-wire idle channel noise at VTR is specified with the 2-wire port terminated in 600Ω (RL) and with the 4-wire receive port (VTX) floating (Reference Figure 9). 25. Four-Wire Idle Channel Noise - The 4-wire idle channel noise at VTX is specified with the 2-wire port terminated in 600Ω (RL). The noise specification is with respect to a 600Ω impedance level at VTX. The 4-wire receive port (VTX) floating (Reference Figure 9). 26. Harmonic Distortion (2-Wire to 4-Wire) - The harmonic distortion is measured within the voice band with the following conditions. EG = 0dBm at 1kHz, RL = 600Ω. Measurement taken at VTX. (Reference Figure 7). 27. Harmonic Distortion (4-Wire to 2-Wire) - The harmonic distortion is measured within the voice band with the following conditions. ERX = 0dBm0. Vary frequency between 300Hz and 3.4kHz, RL = 600Ω. Measurement taken at VTR. (Reference Figure 8). 28. Constant Loop Current - The constant loop current is calculated using the following equation: IL = 1000/RLIM = VTR/600 (Reference Figure 10). 29. Ground Key Detector - (TRIGGER) Ground the Ring pin through a 2.5kΩ resistor and verify that GKD goes low. (RESET) Disconnect the Ring pin and verify that GKD goes high. (Hysteresis) Compare difference between trigger and reset. 30. Electrical Test - Not tested in production at -40oC. Circuit Operation and Design Information The tip and ring voltages for various loop resistances are shown in Figure 13. The tip voltage remains relatively constant as the ring voltage moves to limit the loop current for short loops. . 35 30 LOOP CURRENT (mA) The UniSLIC14 family of SLICs are voltage feed current sense Subscriber Line Interface Circuits (SLIC). For short loop applications, the voltage between the tip and ring terminals varies to maintain a constant loop current. For long loop applications, the voltage between the tip and ring terminals are relatively constant and the loop current varies in proportion to the load. CONSTANT TIP TO RING VOLTAGE REGION 25 20 CONSTANT LOOP CURRENT REGION 15 VBH = -48V RD = 41.2kΩ ROH = 38.3kΩ RDC_RAC = 19.6kΩ RILim = 33.2kΩ 10 5 The loop current for various loop resistances are shown in Figure 14. For short loops, the loop current is limited to the programmed current limit, set by RILIM. For long loop applications, the loop current varies in accordance with Ohms law for the given tip to ring voltage and the loop resistance. 0 -2.5V TIP TIP AND RING VOLTAGES (V) -5 -10 CONSTANT TIP TO RING VOLTAGE REGION -15 VBH = -48V RD = 41.2kΩ ROH = 38.3kΩ RDC_RAC = 19.6kΩ RILim = 33.2kΩ -25 -30 -35 -40 -45 CONSTANT LOOP CURRENT REGION -44.5V -50 200 600 1000 1400 1800 2000 4K 6K 8K 10K LOOP RESISTANCE (Ω) FIGURE 13. TIP AND RING VOLTAGES vs LOOP RESISTANCE 4-13 200 600 1K 1.4K 1.8K 2.2K 2.6K 3.0K 3.4K 3.8K LOOP RESISTANCE (Ω) FIGURE 14. LOOP CURRENT vs LOOP RESISTANCE The following discussion separates the SLIC’s operation into its DC and AC paths, then follows up with additional circuit and design information. DC Feed Curve RING -20 0 The DC feed curve for the UniSLIC14 family is user programmable. The user defines the on hook and off hook overhead voltages (including the overhead voltage for off hook pulse metering if applicable), the maximum and minimum loop current limits, the switch hook detect threshold and the battery voltage. From these requirements, the DC feed curve is customized for optimum operation in any given application. An Excel spread sheet to calculate the external components can be downloaded off our web site www.intersil.com/telecom/unislic14.xls. HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 VBH 2.5V † SLIC SELF PROGRAMMING TIP TO RING ABSOLUTE VOLTAGE (V) VOH(on) AT LOAD CONSTANT CURRENT REGION VOH(off) AT LOAD RSAT 60kΩ SLOPE ) ax P(m OO IOH RL ISH- ISHD ILOOP(min) ILOOP(max) LOOP CURRENT (mA) † Internal overhead voltage automatically generated by the SLIC. FIGURE 15. UniSLIC14 DC FEED CURVE On Hook Overhead Voltage TIP TO RING VOLTAGE The on hook overhead voltage at the load (VOH(on) at Load) is independent of the VBH 2.5V battery voltage. Once set, the VOH(on) ON HOOK OVERHEAD on hook voltage remains constant as the VBH battery voltage changes. The on hook ISH- ISHD voltage also remains constant LOOP CURRENT over temperature and line ISH- = ISHD(0.6) leakages up to 0.6 times the Switch Hook Detect threshold (ISHD ). The maximum loop current for a constant on hook overhead voltage is defined as ISH-. DC FEED CURVE VBH To account for any process and temperature variations in the performance of the SLIC, 1.5V is added to the overhead voltage requirement for the on hook case in Equation 1 and 2.0V for the off hook case in Equation 3. Note the 2.5V overhead is automatically generated in the SLIC and is not part of the external overhead programming. 2RP (EQ. 1) UniSLIC14 2RS VZL TIP AND RING AMPLIFIERS INTERNAL SENSE RESISTORS ZL 2R P + 2R S V OH ( ON, OFF ) = ------------------------------ V ZL ZL Where: VZL is the required on hook or offhook transmission delivered to the load. (LOAD) The on hook overhead voltage, required for a given signal level at the load, must take into account the AC voltage drop across the 2 external protection resistors (RP) and the 2 internal sense resistors (RS) as shown in Figure 16. The AC on hook overload voltage is calculated using Equation 1. 2R P + 2R S V OH ( on ) at Load = V sp ( on ) × 1 + ------------------------------ + 1.5V ZL REQUIRED OVERHEAD VOLTAGE VOH (ON, OFF) EXTERNAL PROTECTION RESISTOR FIGURE 16. OVERHEAD VOLTAGE OF THE TIP AND RING AMPLIFIERS Off Hook Overhead Voltage VOH(on) at Load = On hook overhead voltage at load Vsp(on) = Required on hook transmission for speech RP = Protection Resistors (Typically 30Ω) RS = Internal Sense Resistors (40Ω) ZL = AC load impedance for (600Ω) 1.5V = Additional on hook overhead voltage requirement 4-14 DC FEED CURVE TIP TO RING VOLTAGE where VBH VSAT VOH(off) 2.5V OFF HOOK OVER HEAD ILOOP(min) LOOP CURRENT The off hook overhead voltage VOH(off) at Load is also independent of the VBH battery voltage and remains constant over temperature. The required off hook overhead voltage is the sum of the AC and DC voltage drops across the internal sense resistors (RS), the HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 The off hook overhead voltage is defined in Equation 2 and calculated using Equation 3. V OH ( off ) at Load = V OH ( Rsense ) + V sp ( off ) + V pm ( off ) (EQ. 2) where: VOH(off) at Load = Off hook overhead voltage at load Before using this RSAT value, to calculate the RDC_RAC resistor, we need to verify that the on hook requirements will also be met. TIP TO RING VOLTAGE protection resistors (RP), the required (peak) off hook voltage for speech (Vsp(off)) and the required (peak) off hook voltage for the pulse metering (Vpm(off)), if applicable. DC FEED CURVE VBH VSAT VOH(on) VOH(Rsense) = Required overhead for the DC voltage drop across sense resistors (2RS x Iloop(max)) Vsp(off) = Required (peak) off hook AC voltage for speech Vpm(off) = Required (peak) off hook AC voltage for pulse metering 2R P + 2R S V OH(off) at Load = 80 × I LOOP ( max ) + V sp ( off ) × 1 + ------------------------------ ZL 2R P + 2R S + V pm ( off ) × 1 + ------------------------------ + 2.0V Z pm (EQ. 3) 2.5V RSAT ISH-(min) LOOP CURRENT VOH(on) AT LOAD RSAT ISH-(min) 2.85V R SAT ( on ) = ------------------ = 395Ω 7.2mA The on hook overhead voltage calculated with the off hook RSAT (RSAT(off)), is given in Equation 5 and equals 3.0V. The on hook overhead calculated with Equation 1 equals 2.85V for the given system requirements (recommended application circuit in back of data sheet): Switch Hook Detect threshold = 12mA, ISH- = (0.6)12mA = 7.2mA, Vsp(on) = 0.775VRMS Thus, the on hook overhead requirements of 2.85V will be met if we use the RSAT(off) value. V OH ( on ) = ( ISH- ) ( R SAT ( off ) ) (EQ. 5) where: V OH ( on ) = 7.2mA × 417Ω 80 = 2Rs + 2RINT (reference Figure 17) V OH ( on ) = 3.0V Zpm = Pulse metering load impedance (typically 200Ω). If the on hook overhead requirement is not met, then we need to use the RSAT(on) value to determine the RDC_RAC resistor value. The external saturation guard resistor RDC_RAC is equal to 50 times RSAT. 2.0V = Additional off hook overhead voltage requirement RSAT Resistance Calculation TIP TO RING VOLTAGE The RSAT resistance of the DC feed curve is used to determine the value of the RDC_RAC resistor (Equation 6). The value of this resistor has an effect on both the on hook and off hook overheads. In most applications the off hook condition will dominate the overhead requirements. Therefore, we’ll start by calculating the RSAT value for the off hook conditions and then verify that the on hook conditions are also satisfied. DC FEED CURVE VBH VSAT VOH(off) 2.5V RSAT When considering the Off hook condition, RSAT is equal to VOH(off) at Load divided by Iloop(min) (Equation 4). For the given system requirements (recommended application circuit in back of ILOOP(min) data sheet): Iloop (min) = LOOP CURRENT 20mA, Iloop (max) = 30mA, RSAT VOH(off) AT LOAD Vsp(off) = 3.2VPEAK, Vspm(off) = 0VPEAK, ILOOP(min) VOH(off) at Load = 8.34V the value of RSAT(off) is equal to 417Ω as calculated in Equation 4. V OH(off) at Load 8.34V R SAT(off) = ---------------------------------------- = ---------------- = 417Ω I LOOP(min) 20mA 4-15 (EQ. 4) In the example above RSAT would equal 417Ω and RDC_RAC would then equal to 20.85kΩ (closest standard value is 21kΩ). RDC_RAC = 50 x R SAT (EQ. 6) The Switch Hook Detect threshold current is set by resistor RD and is calculated using Equation 7. For the above example RD is calculated to be 41.6kΩ (500/12mA). The next closest standard value is 41.2kΩ. 500 R D = -----------I SHD (EQ. 7) The true value of ISH-, for the selected value of RD is given by Equation 8: 500 ISH- = ---------- (0.6) RD (EQ. 8) For the example above, ISH- equals 7.28mA (500 x 0.6/ 41.2K). Verify that the value of ISH- is above the suspected line leakage of the application. The UniSLIC family will provide a constant on hook voltage level for leakage currents up to this value of line leakage. TIP TO RING VOLTAGE HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 DC FEED CURVE VBH VSAT 2.5V OFF HOOK OVER HEAD VOH(off) The ROH resistor, which is used to set the offhook overhead voltage, is calculated using Equations 9 and 10. IOH Node Equation V RX VA ------------- - ------------- = I X 500k 500k Substitute Equation 14 into Equation 15 IOH is defined as the difference between the ILOOP(min) ISHILOOP(min) and ISH-. LOOP CURRENT Substituting Equation 8 for ISH- into Equation 9 and solving for ROH defines ROH in terms of ILOOP(min) and RD. V RX I M ( Z TR – 2R P ) I X = ------------- - ----------------------------------------500k 1000k 500 500 R OH = ---------- = -------------------------------------------I OH I LOOP(min) - ISH- Substitute Equation 16 into Equation 17 (EQ. 9) R D 500 R OH = -----------------------------------------------------------RD I - 500(.6) (EQ. 10) LOOP(min) The current limit is set by a single resistor and is calculated using Equation 11. 1000 R LIM = ----------------------------I LOOP(max) (EQ. 11) (EQ. 16) Loop Equation I X 500k - V TX ′ + I X 500k = 0 V TX ′ = 2V RX – I M ( Z TR – 2R P ) Equation 10 can be used to determine the actual ISH- value resulting from the RD resistor selected. The value of RD should be the next standard value that is lower than that calculated. This will insure meeting the ILOOP(min) requirement. ROH for the above example equals 39.1kΩ. (EQ. 15) Loop Equation V TR -I M 2R P + V TX ′ = 0 (EQ. 17) (EQ. 18) (EQ. 19) Substitute Equation 18 into Equation 19 V TR = I M Z TR – 2V RX (EQ. 20) Substituting -VTR/ZL into Equation 20 for IM and rearranging to solve for VTR results in Equation 21 Z TR V TR 1 + ----------- = – 2 V RX ZL (EQ. 21) where: TIP TO RING VOLTAGE The maximum loop VBH resistance is calculated using Equation 12. The 2.5V VSAT resistance of the VOH(off) protection resistors X) A (2RP) is subtracted out M P( R LOO to obtain the maximum ILOOP(min) loop length to meet the LOOP CURRENT required off hook overhead voltage. If RLOOP(MAX) meets the loop length requirements you are done. If the loop length needs to be longer, then consider adjusting one of the following: 1) the SHD threshold, 2) minimum loop current requirement or 3) the on and off hook signal levels. DC FEED CURVE V BH – [ V SAT + 2V + V OH ( off ) ] R LOOP(max) = ------------------------------------------------------------------------------- -2R P I LOOP(min) (EQ. 12) VRX = The input voltage at the VRX pin. VA = An internal node voltage that is a function of the loop current detector and the impedance matching networks. IX = Internal current in the SLIC that is the difference between the input receive current and the feedback current. IM = The AC metallic current. RP = A protection resistor (typical 30Ω). ZT = An external resistor/network for matching the line impedance. VTX´= The tip to ring voltage at the output pins of the SLIC. VTR = The tip to ring voltage including the voltage across the protection resistors. ZL = The line impedance. ZTR = The input impedance of the SLIC including the protection resistors. SLIC in the Active Mode Figure 17 shows a simplified AC transmission model. Circuit analysis yields the following design equations: 1 V A = I M × 2R S × ---------- × 200 ( Z TR – 2R P ) × 5 80k (EQ. 13) IM V A = ------- ( Z TR – 2R P ) 2 (EQ. 14) (AC) 4-Wire to 2-Wire Gain The 4-wire to 2-wire gain is equal to VTR/VRX. From Equation 21 and the relationship ZT = 200(ZTR-2RP). V TR ZL ZL G 4-2 = ----------- = -2 ------------------------- = – 2 ---------------------------------------------V RX Z L + Z TR ZT Z L + ---------- + 2R P 200 (EQ. 22) Notice that the phase of the 4-wire to 2-wire signal is 180o out of phase with the input signal. 4-16 HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 IX + - TIP IM + 500K IM - RS A=1 + + 20Ω 20Ω RP ZTR RINT VTX 500K + VTX - ZL + VTR - PTG 500K IX - IM + RING IX UniSLIC14 VTX´ + + EG - IX - + RS RINT 20Ω RP + IX 20Ω VRX + - 500K 500K 500K + VRX - 1/80K 5 I VA = IM(ZTR-2RP) 2 ZT = 200 (ZTR - 2RP) FIGURE 17. SIMPLIFIED AC TRANSMISSION CIRCUIT (AC) 2-Wire to 4-Wire Gain The 2-wire to 4-wire gain is equal to VTX/EG with VRX = 0 Notice that the phase of the 2-wire to 4-wire signal is in phase with the input signal. (AC) 4-Wire to 4-Wire Gain Loop Equation – E G + Z L I M + 2R P I M – V TX ′ = 0 (EQ. 23) From Equation 18. From Equation 18 with VRX = 0 V TX ′ = – I M ( Z TR – 2R P ) (EQ. 24) Substituting Equation 24 into Equation 23 and simplifying. E G = I M ( Z L + Z TR ) (EQ. 29) Substituting -VTR /ZL into Equation 29 for IM results in Equation 30. (EQ. 26) V TR ( Z TR – 2R P ) V TX = – 2 V RX – --------------------------------------------ZL A more useful form of the equation is rewritten in terms of VTX /VTR. A voltage divider equation is written to convert from EG to VTR as shown in Equation 27. Z TR V TR = ------------------------ E G Z TR + Z L V TX ′ = – V TX = – 2 V RX + I M ( Z TR – 2R P ) (EQ. 25) By design, VTX = -VTX´, therefore V TX I M ( Z TR – 2R P ) ( Z TR – 2R P ) G 2-4 = ---------- = ---------------------------------------- = --------------------------------I M ( Z L + Z TR ) EG ( Z L + Z TR ) The 4-wire to 4-wire gain is equal to VTX/VRX, EG = 0. (EQ. 30) Substituting Equation 21 for VTR in Equation 30 and simplifying results in Equation 31. V TX Z L + 2R P G 4 – 4 = ----------- = – 2 ------------------------ V RX Z L + Z TR (EQ. 31) (EQ. 27) (AC) 2-Wire Impedance Rearranging Equation 27 in terms of EG, and substituting into Equation 26 results in an equation for 2-wire to 4-wire gain that’s a function of the synthesized input impedance of the SLIC (ZTR) and the protection resistors (RP). (EQ. 28) V TX Z TR - 2R P G 2-4 = ----------- = ----------------------------V TR Z TR The AC 2-wire impedance (ZTR) is the impedance looking into the SLIC, including the fuse resistors. The formula to calculate the proper ZT for matching the 2-wire impedance is shown in Equation 32. Z T = 200 • ( Z TR – 2R P ) Equation 32 can now be used to match the SLIC’s impedance to any known line impedance (ZTR). 4-17 (EQ. 32) HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 EXAMPLE: Off hook Ring Voltage in Current Limit Calculate ZT to make ZTR = 600Ω in series with 2.16µF. RP = 30Ω. V RING ( CL ) = V TIP ( offhook ) – I LOOP ( MAX ) R L – 0.2V 1 Z T = 200 600 + ----------------------------------- – ( 2 ) ( 30 ) –6 jω2.16X10 (EQ. 33) ZT = 114kΩ in series with 0.0108µF. Note: Some impedance models, with a series capacitor, will cause the op-amp feedback to behave as an open circuit DC. A resistor with a value of about 10 times the reactance of the ZT capacitor (2.16µF/200 = 10.8nF) at the low frequency of interest (200Hz for example) can be placed in parallel with the capacitor in order to solve the problem (736kΩ for a 10.8nF capacitor). (EQ. 37) The off hook ring to ground voltage (not in current limit) is calculated using Equation 38. The 1.5V results from the SLIC self programming. ILOOP(min) is the minimum loop current allowed by the design and the value of RSAT(off) is calculated in Equation 4. Off hook Ring Voltage not in Current Limit R SAT ( off ) V RING ( NCL ) = V BH + 1.5V + ( I LOOP ( min ) ) -------------------------- 2 – I LOOP ( MIN ) × R P (EQ. 38) Layout Considerations Calculating Tip and Ring Voltages The on hook tip to ground voltage is calculated using Equation 34. The minus 1.0 volt results from the SLIC self programming. ISH- is the maximum loop current for a constant on hook overhead voltage (ISH- = ISHD(0.6)) and the value of RSAT(off) is calculated in Equation 4. On hook Tip Voltage R SAToff V TIP ( onhook ) = – 1.0V + – ( ISH- ) ---------------------- 2 (EQ. 34) The off hook tip to ground voltage is calculated using Equation 35. ILOOP(min) is the minimum loop current allowed by the design and the value of RSAT(off) is calculated in Equation 4. Off hook Tip Voltage R SAT ( off ) V TIP ( offhook ) = – 1V – ( I LOOP ( min ) ) -------------------------2 – I LOOP ( MAX ) × R P (EQ. 35) The on hook ring to ground voltage is calculated using Equation 36. The 1.5 volt results from the SLIC self programming. ISH- is the maximum loop current for a constant on hook overhead voltage (ISH- = ISHD(0.6)) and the value of RSAT(off) is calculated in Equation 4. On hook Ring Voltage R SAT ( off ) V RING ( onhook ) = V BH + 1.5V + ( ISH ) -------------------------- 2 (EQ. 36) The calculation of the ring voltage with respect to ground in the off hook condition is dependent upon whether the SLIC is in current limit or not. The off hook ring to ground voltage (in current limit) is calculated using Equation 37. ILIM is the programmed loop current limit and RL is the load resistance across tip and ring. The minus 0.2V is a correction factor for the 60kΩ slope in Figure 15. 4-18 Systems with Dual Supplies (VBH and VBL) If the VBL supply is not derived from the VBH supply, it is recommended that an additional diode be placed in series with the VBH supply. The orientation of this diode is anode on pin 8 of the device and cathode to the external supply. This external diode will inhibit large currents and potential damage to the SLIC, in the event the VBH supply is shorted to GND. If VBL is derived from VBH then this diode is not required. Floating the PTG Pin The PTG pin is a high impedance pin (500kΩ) that is used to program the 2-wire to 4-wire gain to either 0dB or -6dB. If 0dB is required, it is necessary to float the PTG pin. The PC board interconnect should be as short as possible to minimize stray capacitance on this pin. Stray capacitance on this pin forms a low pass filter and will cause the 2-wire to 4-wire gain to roll off at the higher frequencies. If a 2-wire to 4-wire gain of -6dB is required, the PTG pin should be grounded as close to the device as possible. SPM Pin For optimum performance, the PC board interconnect the SPM pin should be as short as possible. If pulses metering is not being used, then this pin should be grounded as close to the device pin as possible. RLIM Pin The current limiting resistor RLIM needs to be as close to the RLIM pin as possible. Layout of the 2-Wire Impedance Matching Resistor ZT Proper connection to the ZT pin is to have the external ZT network as close to the device pin as possible. The ZT pin is a high impedance pin that is used to set the proper feedback for matching the impedance of the 2-wire side. This will eliminate circuit board capacitance on this pin to maintain the 2-wire return loss across frequency. HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 TABLE 1. DETECTOR STATES OUTPUT STATE C3 C2 C1 0 0 0 0 Open Circuit State SLIC OPERATING STATE 4 wire loopback test capability ACTIVE DETECTOR 1 0 0 1 Ringing State (Previous State cannot be Reverse Active State) Ring Trip Detector 2 0 1 0 Forward Active State Loop Current Detector SHD GKD_ LVM HIGH HIGH HIGH Ground Key Detector 3 0 1 1 Test Active State On Hook Loopback Detector Requires previous state to be in the Ground Key Detector Forward Active state to determine the On hook or Off hook status of the line. Off Hook Loop Current Detector Line Voltage Detector 4 1 0 0 Tip Open - Ground Start State Ground Key Detector 5 1 0 1 Reserved Reserved 6 1 1 0 Reverse Active State Loop Current Detector LOW HIGH LOW N/A N/A Ground Key Detector 7 8 1 X 1 X 1 X Test Reversal Active State On Hook Loop Current Detector Requires previous state to be in the Reverse Active state to determine the Off Hook Loop Current Detector On hook or Off hook status of the line. Line Voltage Detector LOW Thermal Shutdown LOW Digital Logic Inputs Table 1 is the logic truth table for the 3V to 5V logic input pins. A combination of the control pins C3, C2 and C1 select 1 of the possible 6 operating states. The 8th state listed is Thermal Shutdown. Thermal Shutdown protection is invoked if a fault condition on the tip or ring causes the junction temperature of the die to exceed 175oC. A description of each operating state and the control logic follows: Open Circuit State (C3 = 0, C2 = 0, C1 = 0) In this state, the tip and ring outputs are in a high impedance condition (>1MΩ). No supervisory functions are available and SHD and GKD outputs are at a TTL high level. 4-wire loopback testing can be performed in this state. With the PTG pin floating, the signal on the VTX output is 180o out of phase and approximately 2 times the VRX input signal. If the PTG pin is grounded, then the amplitude will be approximately the same as its input and 180o out of phase. Ringing State (C3 = 0, C2 = 0, C1 = 1) In this state, the output of the ring relay driver pin (RRLY) goes low (energizing the ring relay to connect the ringing signal to the phone) if either of the following two conditions are satisfied: 4-19 HIGH LOW (1) The RSYNC_REV pin is grounded through a resistor This connection enables the RRLY pin to go low the instant the ringing state is invoked, without any regard for the ringing voltage (90VRMS -120VRMS) across the relay contacts. The resistor (34.8kΩ to 70kΩ) is required to limit the current into the RSYNC_REV pin. (2) A ring sync pulse is applied to the RSYNC_REV pin This connection enables the RRLY pin to go low at the command of a ring sync pulse. A ring sync pulse should go low at zero voltage crossing of the ring signal. This pulse should have a rise and fall time <400µs and a minimum pulse width of 2ms. Zero ring current detection is performed automatically inside the SLIC. This feature de-energizes the ring relay slightly before zero current occurs to partially compensate for the delay in the opening of the relay. The SHD output will go low when the subscriber goes off hook. Once SHD is activated, an internal latch will prohibit the re-ringing of the line until the ringing code is removed and then reapplied. The state prior to ringing the phone, can not be the Reverse Active State. In the reverse active state the polarity of the voltage on the CRT_REV_LVM capacitor, will make it appear as if the subscriber is off hook. This subsequently will activate an internal latch prohibiting the ringing of the line. HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 The GKD_LVM output is disabled (TTL high level) during the ringing state. Reference the Section titled “Ringing the Phone” for more information. Forward Active State (C3 = 0, C2 = 1, C1 = 0) In this state, the SLIC is fully functional. The tip voltage is more positive than the ring voltage. The tip and ring output voltages are an unbalanced DC feed, reference Figure 13. Both SHD and GKD supervisory functions are active. Reference the section titled “DC Feed Curve” for more information. Test Active State (C3 = 0, C2 = 1, C1 = 1) Proper operation of the Test Active State requires the previous state be the Forward Active state to determine the on hook or off hook status of the line. In this state, the SLIC can perform two different tests. If the subscriber is on hook when the state is entered, a loopback test is performed by switching an internal 600Ω resistor between tip and ring. The current flows through the internal 600Ω is unidirectional via blocking diodes. (Cannot be used in reverse.) When the loopback current flows, the SHD output will go low and remain there until the state is exited. This is intended to be a short test since the ability to detect subscriber off hook is lost during loopback testing. Reference the section titled “Loopback Tests” for more information. If the subscriber is off hook when the state is entered, a Line Voltage Measurement test is performed. The output of the GKD_LVM pin is a pulse train. The pulse width of the active low portion of the signal is proportional to the voltage across the tip and ring pins. If the loop length is such that the SLIC is operating in constant current, the tip to ring voltage can be used to determine the length of the line under test. The longer the line, the larger the tip to ring voltage and the wider the pulse. This relationship can determine the length of the line for setting gains in the system. Reference the section titled “Operation of Line Voltage Measurement” for more information. performs three different functions: Ring trip filtering, polarity reversal time and line voltage measurement. It is recommended that programming of the reversal time be accomplished by changing the value of RSYNC_REV resistor (see Figure 18). The value of RSYNC_REV resistor is limited between 34.8K (10ms) and 73.2k (21ms). Equation 39 gives the formula for programming the reversal time. RSYNC – REV = 3.47kΩ × ReversalTime ( ms ) (EQ. 39) Both SHD and GKD supervisory functions are active. Reference the section titled “Polarity Reversal” for more information. Test Reversal Active State (C3 = 1, C2 = 1, C1 = 1) Proper operation of the Test Reversal Active State requires the previous state be the Reverse Active state to determine the on hook or off hook status of the line. If the subscriber is on hook when the state is entered, the SLIC’s tip and ring voltages are the same as the Reverse Active state. The SHD output will go low when the subscriber goes off hook and the GKD_LVM output is disabled (TTL level high). (Note: operation is the same as the Reverse Active state with the GKD_LVM output disabled.) If the subscriber is off hook when the state is entered, a Line Voltage Measurement test is performed. The output of the GKD_LVM pin is a pulse train. The pulse width of the active low portion of the signal is proportional to the voltage across the tip and ring pins. If the loop length is such that the SLIC is operating in constant current mode, the tip to ring voltage can be used to determine the length of the line under test. The longer the line, the larger the tip to ring voltage and the wider the pulse. This relationship can determine the length of the line for setting gains in the system. Reference the section titled “Operation of Line Voltage Measurement” for more information. Tip Open State (C3 = 1, C2 = 0, C1 = 0) Thermal Shutdown In this state, the tip output is in a high impedance state (>250kΩ) and the ring output is capable of full operation, i.e. has full longitudinal current capability. The Tip Open/Ground Start state is used to interface to a PBX incoming 2-wire trunk line. When a ground is applied through a resistor to the ring lead, this current is detected and presented as a TTL logic low on the SHD and GKD_LVM output pins. The UniSLIC14’s thermal shutdown protection is invoked if a fault condition causes the junction temperature of the die to exceed about 175oC. Once the thermal limit is exceeded, both detector outputs go low (SHD and GKD_LVM) and one of two things can happen. Reverse Active State (C3 = 1, C2 = 1, C1 = 0) For marginal faults where loop current is flowing during the time of the over-temperature condition, foldback loop current limiting reduces the loop current by reducing the tip to ring voltage. An equilibrium condition will exist that maintains the junction temperature at about 175oC until the fault condition is removed. In this state, the SLIC is fully functional. The ring voltage is more positive than the tip voltage. The tip and ring output voltages are an unbalanced DC feed, reference Figure 13. The polarity reversal time is determined by the RC time constant of the RSYNC_REV resistor and the CRT_REV_LVM capacitor. Capacitor CRT_REV_LVM For short circuit faults (tip or ring to ground, or to a supply, etc.) that result in an over-temperature condition, the foldback current limiting will try to maintain an equilibrium at about 175oC. If the junction temperature keeps rising, the device will thermally shutdown and disconnect tip and ring until the junction temperature falls to approximately 150oC. Reserved (C3 = 1, C2 = 0, C1 = 1) This state is undefined and reserved for future use. 4-20 HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 Supervisory Functions Switch Hook Detect Threshold The Switch Hook Detect Threshold is programmed with a single external resistor (RD). The output of the SHD pin goes low when an off hook condition is detected. Ground Key Detect Threshold The Ground Key Detect Threshold is set internally and is not user programmable. The RSYNC_REV pin is designed to allow the ring sync pulse to be present at all times. There is no need to gate the ring sync pulse on and off. The logic control for the RSYNC_REV pin cannot be an open collector. It must be high (push-pull logic output stage / pull up resistor to VCC), low or being clocked by the ring sync pulse. When the RSYNC_REV pin is high the ring relay pin is disabled. When the RSYNC_REV pin is low the ring relay pin is activated the instant the logic code for ringing is applied. OPENING THE RING RELAY AT ZERO CURRENT Ringing the Phone The UniSLIC14 family handles all the popular ringing formats with high or low side ring trip detection. High side detection is possible because of the high common mode range on the ring signal detect input pins (DT, DR). To minimize power drain from the ring generator, when the phone is not being rung, the sense resistors are typically 2MΩ. This reduces the current draw from the ring generator to just a few microamps. When the subscriber goes off hook during ringing, the UniSLIC14 family automatically releases the ring relay and DC feed is applied to the loop. The UniSLIC14 family has very low power dissipation in the on hook active mode. This enables the SLIC (during the ring cadence) to be powered up in the active state, avoiding unnecessary powering up and down of the SLIC. The control logic is designed to facilitate easy implementation of the ring cadence, requiring only one bit change to go from active to ringing and back again. DT, DR AND RRLY INPUTS Ring trip detection will occur when the DR pin goes more positive than DT by approximately 4V. The ring relay driver pin, RRLY, has an internal clamp between it’s output and ground. This eliminates the need to place an external snubber diode across the ring relay. Reducing Impulse Noise During Ringing With an increase in digital data lines being installed next to analog lines, the threat from impulse noise on analog lines is increasing. Impulse noise can cause large blocks of high speed data to be lost, defeating most error correcting techniques. The UniSLIC14 family has the capability to reduce impulse noise by closing the ring relay at zero voltage and opening the ring relay at zero current. CLOSING THE RING RELAY AT ZERO VOLTAGE Closing the ring relay at zero voltage is accomplished by providing a ring sync pulse to the RSYNC_REV pin. The ring sync pulse is synchronized to go low at the zero voltage crossing of the ring signal. The resistor R1 in Figure 18 limits the current into the RSYNC_REV pin. If a particular polarity reversal time is required, then make R1 equal to the calculated value in Equation 39. If a specific polarity reversal time is not desired, R1 equal to 50kΩ is suggested. 4-21 The ring relay is automatically opened at zero current by the SLIC. The SLIC logic requires zero ringing current in the loop and either a valid switch hook detect (SHD) or a change in the operating mode (cadence of the ringing signal) to release the ring relay. UniSLIC14 RSYNC_REV 24 R1 50kΩ INPUT FOR THE RING SYNC PULSE 5V 0V FIGURE 18. REDUCING IMPULSE NOISE USING THE RSYNC_REV PIN AND SETTING THE POLARITY REVERSAL TIME If the subscriber goes off hook during ringing, the SHD output will go low. An internal latch will sense SHD is low and disable the ring relay at zero ringing current. This prevents the ring signal from being reapplied to the line. To ring the line again, the SLIC must toggle between logic states. (Note: The previous state can not be the Reverse Active State. In the reverse state, the voltage on the CRT_REV_LVM capacitor will activate an internal latch prohibiting the ringing of the line. Figure 19 shows the sequence of events from ringing the phone to ring trip. The ring relay turns on when both the ringing code and ring sync pulse are present (A). SHD is high at this point. When the subscriber goes off hook the SHD pin goes low and stays low until the ringing control code is removed (B). This prevents the SHD output from pulsing after ring trip occurs. At the next zero current crossing of the ring signal, ring trip occurs and the ring relay releases the line to allow loop current to flow in the loop (C). HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 Polarity Reversal RINGING VOLTAGE Most of the SLICs in the UniSLIC14 family feature full polarity reversal. Full polarity reversal means that the SLIC can: transmit, determine the status of the line (on hook and off hook) and provide “silent” polarity reversal. The value of RSYNC_REV resistor is limited between 34.8k (10ms) and 73.2k (21ms). Reference Equation 39 to program the polarity reversal time. RING SYNC PULSE (A) RINGING CODE APPLIED (B) SHD OUTPUT Transhybrid Balance RINGING CURRENT IN LINE (C) RELAY DRIVER OFF ON OFF FIGURE 19. RINGING SEQUENCE Operation of Line Voltage Measurement A few of the SLICs in the UniSLIC14 family feature Line Voltage Measurement (LVM) capability. This feature provides a pulse on the GKD_LVM output pin that is proportional to the loop voltage. Knowing the loop voltage and thus the loop length, other basic cable characteristics such as attenuation and capacitance can be inferred. Decisions can be made about gain switching in the CODEC to overcome line losses and verification of the 2-wire circuit integrity. The LVM function can only be activated in the off hook condition in either the forward or reverse operating states. The LVM uses the ring signal supplied to the SLIC as a timebase generator. The loop resistance is determined by monitoring the pulse width of the output signal on the GKD_LVM pin. The output signal on the GKD_LVM pin is a square wave for which the average duration of the low state is proportional to the average voltage between the tip and ring terminals. The loop resistance is determined by the tip to ring voltage and the constant loop current. Reference Figure 20. If a low cost CODEC is chosen that does not have a transmit op-amp, the UniSLIC14 family of SLICs can solve this problem without the need for an additional op-amp. The solution is to use the Programmable Transmit Gain pin (PTG) as an input for the receive signal (VRX). When the PTG pin is connected to a divider network (R1 and R2 Figure 21) and the value of R1 and R2 is much less than the internal 500kΩ resistors, two things happen. First the transmit gain from VRX to VTX is reduced by half. This is the result of shorting out the bottom 500kΩ resistor with the much smaller external resistor. And second, the input signal from VRX is also decreased in half by resistors R1 and R2. Transhybrid balance occurs when these two, equal but opposite in phase, signals are cancelled at the input to the output buffer. + A=1 500K IX 500K VTX VTX + PTG R1 IX 500K 500K 5 R2 VRX + VRX - UniSLIC14 FIGURE 21. TRANSHYBRID BALANCE USING THE PTG PIN Although the logic state changes to the Test Active State when performing this test, the SLIC is still powered up in the active state (forward or reverse) and the subscriber is unaware the measurement is being taken. TIP RING UniSLIC14 RING GEN FREQ GKD_LVM PULSE WIDTH PROPORTIONAL TO LOOP LENGTH DR DT PULSE WIDTH RING GEN LOOP LENGTH FIGURE 20. OPERATION OF THE LINE VOLTAGE MEASUREMENT CIRCUIT 4-22 Loopback Tests 4-Wire Loopback Test This feature can be very useful in the testing of line cards during the manufacturing process and in field use. The test is unobtrusive, allowing it to be used in live systems. Reference Figure 22. Most systems do not provide 4-wire loopback test capability because of costly relays needed to switch in external loads. All the SLICs in the UniSLIC14 family can easily provide this function when configured in the Open Circuit logic state. With the PTG pin floating, the signal on the VTX output is 180o out of phase and approximately 2 times the VRX input signal. If the PTG pin is grounded, then the amplitude will be approximately the same as the input signal and 180o out of phase. HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 TIP UniSLIC14 INTERNAL 600Ω RING VTX PTG to 2-wire gain (VTR / SPM) is equal 4. Thereby lowering the input signal requirements of the pulse metering signal. + DUAL SUPPLY CODEC/FILTER VRX 2-WIRE LOOPBACK 4-WIRE LOOPBACK FIGURE 22. 4-WIRE AND 2-WIRE LOOPBACK TESTS 2-Wire Loopback Test Most of the SLICs in the UniSLIC14 family feature 2-Wire loopback testing. This loopback function is only activated when the subscriber is on hook and the logic command to the SLIC is in the Test Active State. (Note: if the subscriber is off hook and in the Test Active State, the function performed is the Line Voltage Measurement.) During the 2-wire loopback test, a 2kΩ internal resistor is switched across the tip and ring terminals of the SLIC. This allows the SHD function and the 4-wire to 4-wire AC transmission, right up to the subscriber loop, to be tested. Together with the 4-wire loopback test in the Open Circuit logic state, this 2-wire loopback test allows the complete network (including SLIC) to be tested up to the subscriber loop. Pulse Metering The HC55121, HC55142 and the HC55150 are designed to support pulse metering. They offer solutions to the following pulse metering design issues: 1) Providing adequate signal gain and current drive to the subscriber metering equipment to overcome the attenuation of this (12kHz, 16kHz) out of band signal. Note: The automatic pulse metering 2-wire impedance matching is independent of the programmed 2-wire impedance matching at voiceband frequencies. Calculation of the pulse metering gain is achieved by replacing VRX /500k in Equation 15 with SPM/125k and following the same process through to Equation 21. The UniSLIC14 sets the 2-wire input impedance of the SLIC (ZTR), including the protection resistors, equal to 200Ω. The results are shown in Equation 40. V TR ZL 200 A 4-2 = ------------- = – 8 ------------------------- = – 8 --------------------------- = – 4 SPM Z L + Z TR 200 + 200 Avoiding Clipping in the CODEC/Filter The amplitude of the returning pulse metering signal is often very large and could easily over drive the input to the CODEC/Filter. By using the same method discussed in section “Transhybrid Balance”, most if not all of the pulse metering signal can be canceled out before it reaches the input to the CODEC/Filter. This connection is shown in Figure 23. Overload Levels and Silent Polarity Reversal The pulse metering signal and voice are simultaneously transmitted, and therefore require additional overhead to prevent distortion of the signal. Reference section “Off hook Overhead Voltage” to account for the additional pulse metering signal requirements. + A=1 500K 500K PTG R1 IX 500K 1/80K 500K Adequate Signal Gain ZT R2 VRX = 0 125K SPM 12/16kHz PULSE METERING INPUT SIGNAL 5 4) Having the provision of silent polarity reversal as a backup in the case where the loop attenuates the out of band signal too much for it to be detected by the subscriber’s metering equipment. VTX IX 2) Attenuating the pulse metering transhybrid signal without severely attenuating the voice band signal to avoid clipping in the CODEC/Filter. 3) Tailoring the overload levels in the SLIC to avoid clipping of the combined voiceband and pulse metering signal. (EQ. 40) SETS 2-WIRE IMPEDANCE AT 12-16kHz EQUAL TO 200Ω UniSLIC14 Adequate signal gain and current drive to the subscriber’s metering equipment is made easier by the network shown in Figure 23. The pulse metering signal is supplied to a dedicated high impedance input pin called SPM. The circuit in Figure 23 shows the connection of a network that sets the 2-wire impedance (ZTR), at the pulse metering frequencies, to be approximately 200Ω. If the line impedance (ZL) is equal to 200Ω at the pulse metering frequencies, then the 4-Wire 4-23 FIGURE 23. PULSE METERING WITH TRANSHYBRID BALANCE Most of the SLICs in the UniSLIC14 family feature full polarity reversal. Full polarity reversal means that the SLIC can: transmit, determine the status of the line (on hook and off hook) and provide “silent” polarity reversal. Reference Equation 39 to program the polarity reversal time. HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 Interface to Dual and Single Supply CODECs Power Sharing Great care has been taken to minimize the number of external components required with the UniSLIC14 family while still providing the maximum flexibility. Figures 24A, 24B) shows the connection of the UniSLIC14 to both a dual supply CODEC/Filter and a single supply DSP CODEC/Filter. To eliminate the DC blocking capacitors between the SLIC and the CODEC/Filter when using a dual supply CODEC/Filter, both the receive and transmit leads of the SLIC are referenced to ground. This leads to a very simple SLIC to CODEC/Filter interface, as shown in Figure 24A. When using a single supply DSP CODEC/Filter the output and input of the CODEC/Filter are no longer referenced to ground. To achieve maximum voltage swing with a single supply, both the output and input of the CODEC/Filter are referenced to its own VCC/2 reference. Thus, DC blocking capacitors are once again required. By using the PTG pin of the UniSLIC14 and the externally supplied VCC/2 reference of the CODEC/Filter, one of the DC blocking capacitors can be eliminated (Figure 24B). + A=1 VTX The power dissipation in the SLIC is the sum of the smaller quiescent supply power and the much larger power that results from the loop current. The power that results from the loop current is the loop current times the voltage across the SLIC. The power sharing resistor (RPS) reduces the voltage across the SLIC, and thereby the on-chip power dissipation. The voltage across the SLIC is reduced by the voltage drop across RPS. This occurs because RPS is in series with the loop current and the negative supply. A mathematical verification follows: Given: VBH = VBL = -48V, Loop current = 30mA, RL (load across tip and ring) = 600Ω, Quiescent battery power = (48V) (0.8mA) = 38.4mW, Quiescent VCC power = (5V) (2.7mA) = 13.5mW, Power sharing resistor = 600Ω. + 1. Without power sharing, the on-chip power dissipation would be 952mW (Equation 41). DUAL SUPPLY CODEC/FILTER 2. With power sharing, the on-chip power dissipation is 412mW (Equation 42). A power redistribution of 540mW. VOUT VRX Power sharing is a method of redistributing the power away from the SLIC in short loop applications. The total system power is the same, but the die temperature of the SLIC is much lower. Power sharing becomes important if the application has a single battery supply (-48V on hook requirements for faxes and modems) and the possibility of high loop currents (reference Figure 25). This technique would prevent the SLIC from getting too hot and thermally shutting down on short loops. UniSLIC14 5V GND On-chip power dissipation without power sharing resistor. -5V PD = ( V BH ) ( 30mA ) + 38.4mW + 13.5mW – ( RL ) ( 30mA ) (EQ. 41) PD = 952mW FIGURE 24A. 2 On-chip power dissipation with 600Ω power sharing resistor. PD = ( V BH ) ( 30mA ) + 38.4mW + 13.5mW 500K + A=1 VTX VIN PTG VREF SINGLE SUPPLY DSP CODEC/FILTER VOUT 500K VRX 2 – ( R L ) ( 30mA ) – ( R PS ) ( 30mA ) 2 (EQ. 42) PD = 412mW 5V GND The design trade-off in using the power sharing resistor is loop length vs on-chip power dissipation. UniSLIC14 TIP UniSLIC14 FIGURE 24B. FIGURE 24. INTERFACE TO DUAL AND SINGLE SUPPLY CODECs Power Management The UniSLIC14 family provides two distinct power management capabilities: Power Sharing and Battery Selection 4-24 RING ON SHORT LOOPS, THE MAJORITY OF CURRENT FLOWS OUT THE VBL PIN VTX VRX VBL VBH RPS -48V -48V FIGURE 25. POWER SHARING (SINGLE SUPPLY SYSTEMS) HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 40 Battery selection is a technique, for a two battery supply system, where the SLIC automatically diverts the loop current to the most appropriate supply for a given loop length. This results in significant power savings and lowers the total power consumption on short loops. This technique is particularly useful if most of the lines are short, and the on hook condition requires a -48V battery. In Figure 26, it can be seen that for long loops the majority of the current comes from the high battery supply (VBH) and for short loops from the low battery supply (VBL). 35 LOOP CURRENT (mA) Battery Selection VBL VBH 30 25 VBH = -48V VBL = -24V RILim = 33.2kΩ 20 15 10 5 VBL VBH 100 150 200 250 300 350 400 450 475 500 525 550 575 600 700 800 900 1000 2000 0 LOOP RESISTANCE (Ω) FIGURE 26. BATTERY SELECTION (DUAL SUPPLY SYSTEMS) Pinouts - 28 Lead PLCC Packages CH RRLY PTG VTX NC VRX ZT CH RRLY PTG VTX SPM VRX HC55121 (28 LEAD PLCC) TOP VIEW ZT HC55120 (28 LEAD PLCC) TOP VIEW 4 3 2 1 28 27 26 4 3 2 1 28 27 26 RING 5 25 AGND RING 5 BGND 6 24 RSYNC BGND 6 25 AGND 24 RSYNC_REV TIP 7 23 ILIM TIP 7 23 ILIM VBH 8 22 ROH VBH 8 22 ROH VBL 9 21 RD VBL 9 21 RD 17 18 12 13 15 16 17 18 CH RRLY PTG VTX NC VRX ZT CH RRLY PTG VTX NC VRX HC55140 (28 LEAD PLCC) TOP VIEW ZT HC55130 (28 LEAD PLCC) TOP VIEW 14 SHD 16 C1 15 C2 14 C3 13 DR CDC 12 DT 19 GKD CDC CRT_REV 11 SHD 19 GKD C1 CRT 11 C2 20 VCC C3 RDC_RAC 10 DR 20 VCC DT RDC_RAC 10 4 3 2 1 28 27 26 4 3 2 1 28 27 26 RING 5 25 AGND RING 5 BGND 6 24 RSYNC BGND 6 25 AGND 24 RSYNC_REV TIP 7 23 ILIM TIP 7 23 ILIM VBH 8 22 ROH VBH 8 22 ROH VBL 9 21 RD VBL 9 21 RD RDC_RAC 10 14 15 16 17 18 12 13 14 15 16 17 18 SHD CDC DT DR C3 C2 C1 SHD 19 GKD_LVM C1 CRT_REV_ 11 LVM C2 DT 19 NC 20 VCC C3 13 RDC_RAC 10 DR 12 CDC CRT 11 20 VCC 4-25 HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 Pinouts - 28 Lead PLCC Packages (Continued) CH RRLY PTG VTX SPM VRX ZT CH RRLY PTG VTX SPM VRX HC55150 (28 LEAD PLCC) TOP VIEW ZT HC55142 (28 LEAD PLCC) TOP VIEW 4 3 2 1 28 27 26 4 3 2 1 28 27 26 RING 5 25 AGND RING 5 25 AGND BGND 6 24 RSYNC_REV TIP 7 23 ILIM TIP 7 23 ILIM VBH 8 22 ROH VBH 8 22 ROH VBL 9 21 RD VBL 9 21 RD 16 17 18 12 13 C2 C1 SHD CDC DT 14 15 16 17 18 SHD 15 C1 14 C2 13 C3 19 LVM DR CDC 12 CRT_REV_ 11 LVM DT 19 GKD_LVM 20 VCC C3 CRT_REV_ 11 LVM RDC_RAC 10 DR 20 VCC RDC_RAC 10 24 RSYNC_REV BGND 6 Pinouts - 32 Lead PLCC Packages CH RRLY PTG TRLY1 TRLY2 VTX ZT CH RRLY PTG TRLY1 TRLY2 VTX HC55121 (32 LEAD PLCC) TOP VIEW ZT HC55120 (32 LEAD PLCC) TOP VIEW 4 3 2 1 32 31 30 4 3 2 1 32 31 30 RING 5 29 NC RING 5 29 NC BGND 6 28 VRX BGND 6 28 VRX CDC 12 CDC 12 22 VCC DT 13 21 GKD DT 13 21 GKD 14 15 16 17 18 19 20 14 15 16 17 18 19 20 SHD 23 RD C1 CRT_REV 11 22 VCC C2 CRT 11 C3 24 ROH 23 RD C4 25 ILIM RDC_RAC 10 C5 VBL 9 24 ROH DR 25 ILIM SHD VBL 9 RDC_RAC 10 C1 26 RSYNC_REV C2 VBH 8 C3 27 AGND C4 VBH 8 26 RSYNC C5 TIP 7 DR TIP 7 27 AGND 4-26 HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 Pinouts - 32 Lead PLCC Packages CH RRLY PTG TRLY1 TRLY2 VTX ZT CH RRLY PTG TRLY1 TRLY2 VTX HC55140 (32 LEAD PLCC) TOP VIEW ZT HC55130 (32 LEAD PLCC) TOP VIEW 4 3 2 1 32 31 30 4 3 2 1 32 31 30 RING 5 29 NC RING 5 29 NC BGND 6 28 VRX BGND 6 28 VRX TIP 7 27 AGND TIP 7 VBH 8 26 RSYNC VBH 8 26 RSYNC_REV VBL 9 25 ILIM VBL 9 25 ILIM RDC_RAC 10 24 ROH RDC_RAC 10 24 ROH 21 GKD_LVM 15 16 17 18 19 20 14 15 C4 C3 C2 C1 SHD DR C5 17 18 19 20 CH RRLY PTG TRLY1 TRLY2 VTX ZT CH RRLY PTG TRLY1 TRLY2 VTX HC55150 (32 LEAD PLCC) TOP VIEW ZT HC55142 (32 LEAD PLCC) TOP VIEW 16 SHD 14 C5 DT 13 DR DT 13 22 VCC CDC 12 C1 21 NC 23 RD C2 CDC 12 22 VCC CRT_REV_LVM 11 C3 23 RD C4 CRT 11 27 AGND 4 3 2 1 32 31 30 4 3 2 1 32 31 30 RING 5 29 SPM RING 5 29 SPM BGND 6 28 VRX BGND 6 28 VRX 27 AGND TIP 7 VBH 8 26 RSYNC_REV 25 ILIM VBL 9 25 ILIM 24 ROH RDC_RAC 10 CRT_REV_ 11 LVM CDC 12 24 ROH DT 13 21 LVM VBH 8 26 RSYNC_REV VBL 9 RDC_RAC 10 CRT_REV_ 11 LVM CDC 12 23 RD 22 VCC 21 GKD_LVM 23 RD 14 15 16 17 18 19 20 14 15 16 17 18 19 20 C5 C4 C3 C2 C1 SHD DR C5 C4 C3 C2 C1 SHD 22 VCC DR DT 13 27 AGND TIP 7 4-27 HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 Pinouts - 28 Lead SOIC Packages HC55120 (28 LEAD SOIC) TOP VIEW HC55121 (28 LEAD SOIC) TOP VIEW 28 AGND ZT 1 28 AGND ZT 1 PTG 2 27 VTX PTG 2 27 VTX RRLY 3 26 NC RRLY 3 26 SPM CH 4 25 VRX 25 VRX CH 4 24 RSYNC RING 5 24 RSYNC_REV RING 5 BGND 6 23 ILIM BGND 6 23 ILIM TIP 7 22 ROH TIP 7 22 ROH VBH 8 21 RD VBH 8 21 RD VBL 9 20 VCC VBL 9 20 VCC RDC_RAC 10 19 SHD RDC_RAC 10 19 SHD CDC 11 18 C1 CDC 11 18 C1 DT 12 17 C2 DT 12 17 C2 DR 13 16 C3 DR 13 16 C3 15 GKD CRT 14 HC55130 (28 LEAD SOIC) TOP VIEW HC55140 (28 LEAD SOIC) TOP VIEW 28 AGND ZT 1 15 GKD CRT_REV 14 ZT 1 28 AGND PTG 2 27 VTX PTG 2 27 VTX RRLY 3 26 NC RRLY 3 26 NC 25 VRX CH 4 24 RSYNC RING 5 CH 4 RING 5 25 VRX 24 RSYNC_REV BGND 6 23 ILIM BGND 6 23 ILIM TIP 7 22 ROH TIP 7 22 ROH VBH 8 21 RD VBH 8 21 RD VBL 9 20 VCC VBL 9 20 VCC RDC_RAC 10 19 SHD RDC_RAC 10 19 SHD CDC 11 18 C1 CDC 11 18 C1 DT 12 17 C2 DT 12 17 C2 DR 13 16 C3 DR 13 16 C3 CRT 14 15 NC CRT_REV_LVM 14 4-28 15 GKD_LVM HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 Pinouts - 28 Lead SOIC Packages (Continued) HC55142 (28 LEAD SOIC) TOP VIEW HC55150 (28 LEAD SOIC) TOP VIEW 28 AGND ZT 1 ZT 1 28 AGND PTG 2 27 VTX PTG 2 27 VTX RRLY 3 26 SPM RRLY 3 26 SPM CH 4 25 VRX CH 4 25 VRX 24 RSYNC_REV RING 5 RING 5 24 RSYNC_REV BGND 6 23 ILIM BGND 6 23 ILIM TIP 7 22 ROH TIP 7 22 ROH VBH 8 21 RD VBH 8 21 RD VBL 9 RDC_RAC 10 20 VCC VBL 9 20 VCC 19 SHD RDC_RAC 10 19 SHD CDC 11 18 C1 CDC 11 18 C1 DT 12 17 C2 DT 12 17 C2 DR 13 16 C3 DR 13 16 C3 15 GKD_LVM CRT_REV_LVM 14 CRT_REV_LVM 14 15 LVM Pin Descriptions 28 PIN PLCC 32 PIN PLCC 28 PIN SOIC SYMBOL DESCRIPTION 1 1 2 PTG Programmable Transmit Gain - The 2-wire to 4-wire transmission gain is 0dB if this pin is left floating and -6.02dB if tied to ground. The -6.02dB gain option is useful in systems where Pulse Metering is used. See Figure 23. 2 2 3 RRLY 3 3 4 CH AC/DC Separation Capacitor - CH is required to properly process the AC current from the DC loop current. Recommended value 0.1µF. 4 4 1 ZT 2-Wire Impedance Matching Pin - Impedance matching of the 2-wire side is accomplished by placing an impedance between the ZT pin and ground. See Equation 32. 5 5 5 RING Connects via protection resistor RP to ring wire of subscriber pair. 6 6 6 BGND Battery ground. 7 7 7 TIP Connects via protection resistor RP to tip wire of subscriber pair. 8 8 8 VBH High Battery Supply (negative with respect to GND). 9 9 9 VBL Low Battery Supply (negative with respect to GND, magnitude ≤ VBH). 10 10 10 RDC_RAC Resistive Feed/Anti Clipping - Performs anti clipping function on constant current application and sets the slope of the resistive feed curve for constant voltage applications. 11 11 14 CRT_REV _LVM Ring Trip, Soft Polarity Reversal and Line Voltage Measurement - A capacitor when placed between the CRT_REV_LVM pin and +5V performs 3 mutually exclusive functions. When the SLIC is configured in the Ringing mode it provides filtering of the ringing signal to prevent false detect. When the SLIC is transitioning between the Forward Active State and Reverse Active State it provides Soft Polarity Reversal and performs charge storage in the Line Voltage Measurement State. Recommended value 0.47µF. 12 12 11 CDC 13 13 12 DT Tip side of Ring Trip Detector - Ring trip detection is accomplished by connecting an external network to a detector in the SLIC with inputs DT and DR. Ring trip occurs when the voltage on DT is more negative than the voltage on DR. 14 14 13 DR Ring Side of Ring Trip Detector - Ring trip detection is accomplished by connecting an external network to a detector in the SLIC with inputs DT and DR. Ring trip occurs when the voltage on DR is more positive than the voltage on DT. - 15 - C5 Activates Test Relay TRLY2. 4-29 Ring Relay Driver Output - The relay coil may be connected to a maximum of 14V. Filter Capacitor- The CDC Capacitor removes the VF signals from the battery feed control loop. HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 Pin Descriptions (Continued) 28 PIN PLCC 32 PIN PLCC 28 PIN SOIC SYMBOL - 16 - C4 Activates Test Relay TRLY1. 15 17 16 C3 TTL Compatible Logic Input. The logic states of C1, C2 and C3 determine the operating states of the SLIC. Reference Table 1 for details. 16 18 17 C2 TTL Compatible Logic Input. The logic states of C1, C2 and C3 determine the operating states of the SLIC. Reference Table 1 for details. 17 19 18 C1 TTL Compatible Logic Input. The logic states of C1, C2 and C3 determine the operating states of the SLIC. Reference Table 1 for details. 18 20 19 SHD Switch Hook Detect - Active during off hook, ground key and loopback. Reference Table 1 for details. 19 21 15 GKD_LVM 20 22 20 VCC 5V Supply. 21 23 21 RD Loop Current Threshold Programming Pin - A resistor between this pin and ground will determine the trigger level for the loop current detect circuit. See Equation 7. 22 24 22 ROH Off Hook Overload Setting Resistor - Used to set combined overhead for voice and pulse metering signals. See Equation 10. 23 25 23 ILIM Current Limit Programming Pin - A resistor between this pin and ground will determine the constant current limit of the feed curve. See Equation 11. 24 26 24 RSYNC_REV 25 27 28 AGND 26 28 25 VRX Receive Input - Ground referenced 4-wire side. 27 29 26 SPM Pulse Metering Signal Input. If pulse metering is not used, then this pin should be grounded as close to the device pin as possible. 28 30 27 VTX Transmit Output - Ground referenced 4-wire side. - 31 - TRLY2 Test Relay Driver 2. - 32 - TRLY1 Test Relay Driver 1. 4-30 DESCRIPTION Ground Key Detector and Line Voltage Measurement - Reference Table 1 for details. Ring Synchronization Input and Reversal Time Setting. A resistor between this pin and GND determines the polarity reversal time. Synchronization of the closing of the relay at zero voltage is achieved via a ring sync pulse (5V to 0V) synchronized to the ring signal zero voltage crossing (Reference Figure 18). Analog ground HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 Basic Application Circuit Voice Only 28 Lead PLCC Package R11 +5V 20 +5V OR +12V C1 2 RELAY 3 RING VCC U1 RRLY PTG CH SPM C2 RP 5 C8 U2 VTX 6 VRX RING AGND BGND ZT TIP C9 RP 7 D1 -24V -48V OPTIONAL C5 8 C7 9 R1 10 C6 12 R2 C3 VBAT VBH VBL RDC_RAC CDC RD SHD GKD_LVM DT C1 14 DR C2 11 CRT_REV_LVM C3 †R9 1 27 †R10 ††C11 26 25 4 R8 24 R7 23 R6 22 R5 21 R4 ILIM ROH 13 R12 R3 RING GENERATOR TIP RSYNC_REV ††C10 28 CODEC/FILTER † PERFORM TRANSHYBRID BALANCE WHEN USING A NON-DSP CODEC. NOT REQUIRED FOR DSP CODEC. †† NOT REQUIRED FOR NON-DSP CODEC’s. REQUIRED FOR DSP CODEC’s 18 19 17 16 15 C4 CONTROL LOGIC +5V FIGURE 27. UniSLIC14 VOICE ONLY BASIC APPLICATION CIRCUIT TABLE 2. BASIC APPLICATION CIRCUIT COMPONENT LIST COMPONENT U1 - SLIC U2 - Dual Asymmetrical Transient Voltage Suppressor VALUE TOLERANCE RATING UniSLIC14 Family N/A N/A TISP1072F3 N/A N/A RP (Line Feed Resistors) 30Ω Matched 1% 2.0W R1 (RDC_RAC Resistor) 21kΩ 1% 1/16W R2, R3 2MΩ 1% 1/16W R4 (RD Resistor) 41.2kΩ 1% 1/16W R5 (ROH Resistor) 38.3kΩ 1% 1/16W R6 (RILIM Resistor) 33.2kΩ 1% 1/16W R7 (RSYNC_REV Resistor) 34.8kΩ 1% 1/16W R8 (RZT Resistor) 107kΩ 1% 1/16W R9, R10, R11 20kΩ 1% 1/16W R12 400Ω 5% 2W C1 (Supply Decoupling), C2 0.1µF 20% 10V C5 (Supply Decoupling) 0.1µF 20% 50V C6 (Supply Decoupling) 0.1µF 20% 100V C4, C7, C10, C11 0.47µF 20% 10V C3 4.7µF 20% 50V C8, C9 2200pF 20% 100V D1, Recommended if the VBL supply is not derived from the VBH Supply 1N4004 - - Design Parameters: Maximum on hook voltage = 0.775VRMS, Maximum Off hook Voice = 3.2VPEAK, Switch Hook Threshold = 12mA, Loop Current Limit = 31mA, Synthesize Device Impedance = 540Ω (600 - 60), with 30Ω protection resistors, impedance across Tip and Ring terminals = 600Ω. Where applicable, these component values apply to the Basic Application Circuits for the HC55120, HC55121, HC55130/1, HC55140/1, HC55142/3 and HC55150/1. Pins not shown in the Basic Application Circuit are no connect (NC) pins. 4-31 HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 Basic Application Circuit Pulse Metering 28 Lead PLCC Package R11 +5V 20 +5V OR +12V VCC C1 2 RELAY RING U1 3 PTG RRLY CH SPM C2 RP 5 U2 C8 6 VTX VRX RING AGND RP C9 -24V -48V 7 D1 OPTIONAL C5 C6 8 C7 VBH 10 C3 R12 13 14 11 R3 1 RDC_RAC 25 4 R8 24 R7 23 R6 22 R5 21 R4 ILIM CDC RD SHD GKD_LVM DT C1 DR C2 CRT_REV_LVM C3 †R10 ††C11 26 ROH VBL 12 RING GENERATOR VBAT RSYNC_REV 9 R1 R2 TIP †R9 27 BGND ZT TIP ††C10 28 CODEC/FILTER 12/16kHz PULSE METERING INPUT SIGNAL † PERFORM TRANSHYBRID BALANCE WHEN USING A NON-DSP CODEC. NOT REQUIRED FOR DSP CODEC. 18 †† 19 17 NOT REQUIRED FOR NON-DSP CODEC’s. REQUIRED FOR DSP CODEC’s 16 15 C4 CONTROL LOGIC +5V FIGURE 28. UniSLIC14 PULSE METERING BASIC APPLICATION CIRCUIT TABLE 3. BASIC APPLICATION CIRCUIT COMPONENT LIST COMPONENT U1 - SLIC U2 - Dual Asymmetrical Transient Voltage Suppressor VALUE TOLERANCE RATING UniSLIC14 Family N/A N/A TISP1072F3 N/A N/A RP (Line Feed Resistors) 30Ω Matched 1% 2.0W R1 (RDC_RAC Resistor) 26.1kΩ 1% 1/16W 2MΩ 1% 1/16W R4 (RD Resistor) R2, R3 41.2kΩ 1% 1/16W R5 (ROH Resistor) 38.3kΩ 1% 1/16W R6 (RILIM Resistor) 33.2kΩ 1% 1/16W R7 (RSYNC_REV Resistor) 34.8kΩ 1% 1/16W R8 (RZT Resistor) 107kΩ 1% 1/16W R9, R10, R11 20kΩ 1% 1/16W R12 400Ω 5% 2W C1 (Supply Decoupling), C2 0.1µF 20% 10V C5 (Supply Decoupling) 0.1µF 20% 50V C6 (Supply Decoupling) 0.1µF 20% 100V C4, C7, C10, C11 0.47µF 20% 10V C3 4.7µF 20% 50V C8, C9 2200pF 20% 100V D1, Recommended if the VBL supply is not derived from the VBH Supply 1N4004 - - Design Parameters: Maximum on hook voltage = 0.775VRMS, Maximum off hook voice = 1.1VPEAK, Maximum simultaneous pulse metering signal = 2.2VRMS, Switch Hook Threshold = 12mA, Loop Current Limit = 31mA, Synthesize Device Impedance = 540Ω (600 - 60), with 30Ω protection resistors, impedance across Tip and Ring terminals = 600Ω . Where applicable, these component values apply to the Basic Application Circuits for the HC55120, HC55121, HC55130/1, HC55140/1, HC55142/3 and HC55150/1. Pins not shown in the Basic Application Circuit are no connect (NC) pins. 4-32 HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 Basic Application Circuit Voice Only 28 Lead SOIC Package R11 +5V 20 +5V OR +12V C1 3 RELAY 4 RING VCC U1 CH SPM 5 U2 C8 6 VRX RING AGND BGND ZT TIP RP C9 7 D1 OPTIONAL -24V -48V C5 8 9 C7 R1 C6 10 11 R2 C3 R12 14 R3 RING GENERATOR VBAT RSYNC_REV TIP VBH †R9 26 VBL 28 1 R8 24 R7 23 R6 22 R5 21 R4 ILIM RDC_RAC CDC RD SHD GKD_LVM DT C1 DR C2 CRT_REV_LVM C3 †R10 ††C11 25 ROH 12 13 ††C10 27 RRLY C2 RP VTX CODEC/FILTER † PERFORM TRANSHYBRID BALANCE WHEN USING A NON-DSP CODEC. NOT REQUIRED FOR DSP CODEC. †† NOT REQUIRED FOR NON-DSP CODEC’s. REQUIRED FOR DSP CODEC’s 19 15 18 17 16 C4 CONTROL LOGIC +5V FIGURE 29. UniSLIC14 VOICE ONLY BASIC APPLICATION CIRCUIT TABLE 4. BASIC APPLICATION CIRCUIT COMPONENT LIST COMPONENT U1 - SLIC U2 - Dual Asymmetrical Transient Voltage Suppressor VALUE TOLERANCE RATING UniSLIC14 Family N/A N/A TISP1072F3 N/A N/A RP (Line Feed Resistors) 30Ω Matched 1% 2.0W R1 (RDC_RAC Resistor) 21kΩ 1% 1/16W R2, R3 2MΩ 1% 1/16W R4 (RD Resistor) 41.2kΩ 1% 1/16W R5 (ROH Resistor) 38.3kΩ 1% 1/16W R6 (RILIM Resistor) 33.2kΩ 1% 1/16W R7 (RSYNC_REV Resistor) 34.8kΩ 1% 1/16W R8 (RZT Resistor) 107kΩ 1% 1/16W R9, R10, R11 20kΩ 1% 1/16W R12 400Ω 5% 2W C1 (Supply Decoupling), C2 0.1µF 20% 10V C5 (Supply Decoupling) 0.1µF 20% 50V C6 (Supply Decoupling) 0.1µF 20% 100V C4, C7, C10, C11 0.47µF 20% 10V C3 4.7µF 20% 50V C8, C9 2200pF 20% 100V D1, Recommended if the VBL supply is not derived from the VBH Supply 1N4004 - - Design Parameters: Maximum on hook voltage = 0.775VRMS, Maximum Off hook Voice = 3.2VPEAK, Switch Hook Threshold = 12mA, Loop Current Limit = 31mA, Synthesize Device Impedance = 540Ω (600 - 60), with 30Ω protection resistors, impedance across Tip and Ring terminals = 600Ω. Where applicable, these component values apply to the Basic Application Circuits for the HC55120, HC55121, HC55130/1, HC55140/1, HC55142/3 and HC55150/1. Pins not shown in the Basic Application Circuit are no connect (NC) pins. 4-33 HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 Basic Application Circuit Pulse Metering 28 Lead SOIC Package R11 +5V 20 +5V OR +12V C1 3 RELAY 4 RING ††C10 VCC VTX U1 PTG RRLY CH SPM C2 RP 5 C8 U2 6 VRX RING AGND BGND ZT TIP C9 RP -24V -48V 7 D1 OPTIONAL C5 C6 8 C7 9 R1 10 11 R2 RING GENERATOR C3 R12 14 R3 TIP ILIM VBH ROH VBL RD RDC_RAC CDC SHD GKD_LVM 12 13 VBAT RSYNC_REV DT C1 DR C2 CRT_REV_LVM C3 †R9 27 2 26 †R10 ††C11 25 28 CODEC/FILTER 1 R8 24 R7 23 R6 22 R5 21 R4 12/16KHz PULSE METERING INPUT SIGNAL † PERFORM TRANSHYBRID BALANCE WHEN USING A NON-DSP CODEC. NOT REQUIRED FOR DSP CODEC. 19 †† 15 18 NOT REQUIRED FOR NON-DSP CODEC’s. REQUIRED FOR DSP CODEC’s 17 16 CONTROL LOGIC C4 +5V FIGURE 30. UniSLIC14 PULSE METERING BASIC APPLICATION CIRCUIT TABLE 5. BASIC APPLICATION CIRCUIT COMPONENT LIST COMPONENT U1 - SLIC U2 - Dual Asymmetrical Transient Voltage Suppressor VALUE TOLERANCE RATING UniSLIC14 Family N/A N/A TISP1072F3 N/A N/A RP (Line Feed Resistors) 30Ω Matched 1% 2.0W R1 (RDC_RAC Resistor) 26.1kΩ 1% 1/16W 2MΩ 1% 1/16W R4 (RD Resistor) 41.2kΩ 1% 1/16W R5 (ROH Resistor) 38.3kΩ 1% 1/16W R6 (RILIM Resistor) 33.2kΩ 1% 1/16W R7 (RSYNC_REV Resistor) 34.8kΩ 1% 1/16W R8 (RZT Resistor) 107kΩ 1% 1/16W R9, R10, R11 20kΩ 1% 1/16W R2, R3 R12 400Ω 5% 2W C1 (Supply Decoupling), C2 0.1µF 20% 10V C5 (Supply Decoupling) 0.1µF 20% 50V C6 (Supply Decoupling) 0.1µF 20% 100V C4, C7, C10, C11 0.47µF 20% 10V C3 4.7µF 20% 50V C8, C9 2200pF 20% 100V D1, Recommended if the VBL supply is not derived from the VBH Supply 1N4004 - - Design Parameters: Maximum on hook voltage = 0.775VRMS, Maximum off hook voice = 1.1VPEAK, Maximum simultaneous pulse metering signal = 2.2VRMS, Switch Hook Threshold = 12mA, Loop Current Limit = 31mA, Synthesize Device Impedance = 540Ω (600 - 60), with 30Ω protection resistors, impedance across Tip and Ring terminals = 600Ω. Where applicable, these component values apply to the Basic Application Circuits for the HC55120, HC55121, HC55130/1, HC55140/1, HC55142/3 and HC55150/1. Pins not shown in the Basic Application Circuit are no connect (NC) pins. 4-34 HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151 All Intersil semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certification. Intersil semiconductor products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. 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