LONG HAUL SLIC IDT821621 Version 1 October 8, 2003 2975 Stender Way, Santa Clara, California 95054 Telephone: (800) 345-7015 • • FAX: (408) 492-8674 Printed in U.S.A. © 2003 Integrated Device Technology, Inc. DISCLAMER Integrated Device Technology, Inc. reserves the right to make changes to its products or specifications at any time, without notice, in order to improve design or performance and to supply the best possible product. IDT does not assume any responsibility for use of any circuitry described other than the circuitry embodied in an IDT product. The Company makes no representations that circuitry described herein is free from patent infringement or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent, patent rights or other rights, of Integrated Device Technology, Inc. LIFE SUPPORT POLICY Integrated Device Technology's products are not authorized for use as critical components in life support devices or systems unless a specific written agreement pertaining to such intended use is executed between the manufacturer and an officer of IDT. 1. Life support devices or systems are devices or systems which (a) are intended for surgical implant into the body or (b) support or sustain life and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any components of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. LONG HAUL SLIC FEATURES ! ! ! ! ! ! ! ! ! ! ! ! ! IDT821621 DESCRIPTION SLIC operating states: Active, Ringing, Standby and Disconnect Low standby power consumption (35 mW) −19 V to −58 V battery operation On-hook transmission Two-wire impedance set by single external impedance Programmable constant-current feed Programmable loop-detect threshold Programmable ring-trip detect threshold +3.3 V / +5 V compatible power supply No −5 V supply required On-chip Thermal Management (TMG) Four on-chip relay drivers and relay snubbers, 1 ringing and 3 general purpose Package available: 32 pin PLCC The IDT821621 is a long haul Subscriber Line Interface Circuit. It implements the basic telephone line interface functions such as battery feeding, impedance matching, off-hook detection and ring-trip detection. The IDT821621 allows battery feeding between −19 V and −58 V and has the capability for driving long loops. The architecture of operating the SLIC in different states according to different loop states minimizes the system power dissipation. This long haul SLIC is pin-to-pin compatible with AMD7920. It provides a cost-effective solution for PBX and Central Office applications. FUNCTIONAL BLOCK DIAGRAM TMG Relay Driver RYOUT3 Relay Driver RYOUT2 Relay Driver RYOUT1 Ring Relay Driver RINGOUT A (TIP) HPA Digital Interface Two-Wire Interface D1 D2 D3 C1 C2 DET Signal Transm ission VTX RSN HPB Off-hook Detector RD RDC CAS B (RING) Power Feed Controller Ring-trip Detector DA DB VBAT BGND VCC VBREF AGND The IDT and the IDT logo are registered trademarks of Integrated Device Technology, Inc. 1 2003 Integrated Device Technology, Inc. October 8, 2003 DSC-6225/1 Table of Contents Features ....................................................................................................................................................................................................................... 1 Description .................................................................................................................................................................................................................. 1 Functional Block Diagram ......................................................................................................................................................................................... 1 Pin Configuration ........................................................................................................................................................................................................ 5 Pin Description ........................................................................................................................................................................................................... 6 Functional Description ............................................................................................................................................................................................... 7 SLIC States Control ......................................................................................................................................................................................... 7 Off-hook Detector ............................................................................................................................................................................................. 7 Ring-trip Detector ............................................................................................................................................................................................. 7 Relay Drivers Control ....................................................................................................................................................................................... 8 DC Feeding ...................................................................................................................................................................................................... 8 Impedance Matching ........................................................................................................................................................................................ 9 Receive Gain Setting ....................................................................................................................................................................................... 9 Thermal Management ...................................................................................................................................................................................... 9 DC Electrical Characteristics ................................................................................................................................................................................... 10 AC Electrical Characteristics ................................................................................................................................................................................... 11 Test Circuits .............................................................................................................................................................................................................. 15 Basic Application Circuit ......................................................................................................................................................................................... 18 Ordering Information ................................................................................................................................................................................................ 19 Table of Contents 2 October 8, 2003 List of Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Loop-Detect Threshold Setting .............................................................................................................................................................. 7 Ring-trip Detection ................................................................................................................................................................................. 8 Relay Drivers Schematic........................................................................................................................................................................ 8 DC Feeding Characteristics ................................................................................................................................................................... 8 DC Feed Programming Circuit............................................................................................................................................................... 8 Two-Wire AC Input Impedance Programming Network ....................................................................................................................... 11 Two-Wire Return Loss ......................................................................................................................................................................... 15 Longitudinal Balance............................................................................................................................................................................ 15 Four-Wire Longitudinal Signal Generation........................................................................................................................................... 16 Two-to-Four Wire Gain......................................................................................................................................................................... 16 Four-to-Two Wire Gain and Four-to-Four Wire Gain ........................................................................................................................... 17 Loop Detector Switching ...................................................................................................................................................................... 17 Basic Application Circuit....................................................................................................................................................................... 18 List of Figures 3 October 8, 2003 List of Tables Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 Table 8 Table 9 Table 10 Table 11 Table 12 Table 13 Table 14 Table 15 Table 16 Table 17 Table 18 Pin Description....................................................................................................................................................................................... 6 SLIC Operating States ........................................................................................................................................................................... 7 Absolute Maximum Ratings ................................................................................................................................................................. 10 Recommended Operating Conditions.................................................................................................................................................. 10 Transmission Performance .................................................................................................................................................................. 11 Longitudinal Capability......................................................................................................................................................................... 11 Idle Channel Noise............................................................................................................................................................................... 12 Insertion Loss and Balance Return Loss Signal .................................................................................................................................. 12 Line Characteristics.............................................................................................................................................................................. 12 Power Supply Rejection Ratio (VRipple=100 mVrms), Active State .................................................................................................... 12 Power Dissipation ................................................................................................................................................................................ 13 Supply Currents, Battery = -48V .......................................................................................................................................................... 13 Receive Summing Node (RSN) ........................................................................................................................................................... 13 Logic Inputs (C2-C1 and D3-D1).......................................................................................................................................................... 13 Logic Output (DET) .............................................................................................................................................................................. 13 Ring-trip Detector Input (DA, DB)......................................................................................................................................................... 13 Loop Detector....................................................................................................................................................................................... 14 Relay Driver Output (RINGOUT, RYOUT1, RYOUT2, RYOUT3) ........................................................................................................ 14 List of Tables 4 October 8, 2003 IDT821621 LONG HAUL SLIC RYOUT1 RINGOUT VCC BGND B (RING) A (TIP) DB PIN CONFIGURATION 4 3 2 1 32 31 30 RYOUT2 5 29 DA RYOUT3 6 28 RD TMG 7 27 HPB VBAT 8 26 HPA D2 9 25 NC D1 10 24 VTX NC 11 23 VBREF NC 12 22 RSN DET 13 21 AGND Pin Configuration 14 15 16 17 18 19 20 D3 C2 C1 CAS NC NC RDC IDT821621 5 October 8, 2003 IDT821621 LONG HAUL SLIC PIN DESCRIPTION Table 1 — Pin Description Pin Name Type PLCC Pin No. AGND Ground 21 Analog ground. BGND Ground 1 Battery ground. VBAT Battery 8 Battery supply and connection to substrate. VBREF − 23 Battery reference pin. It should be connected to VBAT. VCC Power 2 +3.3 V / +5 V compatible power supply. A (TIP) I/O 31 Connection to the Tip wire of the subscriber loop. B (RING) I/O 32 Connection to the Ring wire of the subscriber loop. HPA Capacitor 26 A (TIP) side of high-pass filter capacitor. HPB Capacitor 27 B (RING) side of high-pass filter capacitor. DA Input 29 Negative input to ring-trip comparator. DB Input 30 Positive input to ring-trip comparator. RSN Input 22 Receive summing node. VTX Output 24 Transmit output. C1 C2 Inputs 16 15 SLIC state control. TTL compatible. C2 is MSB and C1 is LSB. Refer to Table 2 for details. D1 D2 D3 Inputs 10 9 14 Relay driver control. TTL compatible. D1, D2 and D3 control the relay drivers RYOUT1, RYOUT2 and RYOUT3 respectively. Logic low on D1 activates the RYOUT1 relay driver. Logic low on D2 activates the RYOUT2 relay driver. Logic low on D3 activates the RYOUT3 relay driver. RYOUT1 Output 4 Relay/switch driver. Open-collector driver with emitter internally connected to BGND. RYOUT2 Output 5 Relay/switch driver. Open-collector driver with emitter internally connected to BGND. RYOUT3 Output 6 Relay/switch driver. Open-collector driver with emitter internally connected to BGND. RINGOUT Output 3 Ringing relay driver. Open-collector driver with emitter internally connected to BGND. Description DET Output 13 Detector output. Open-collector with a built-in 15 kΩ pull-up resistor. This output provides on-hook/off-hook status of the loop based on the selected operating state. Refer to Table 2 for details. The detected output will either be hook switch or ring-trip. Logic low indicates that a hook switch event or ring-trip event has been detected. RD − 28 Detect resistor. An external resistor connected to this pin is used to set the loop-detect threshold. RDC − 20 DC feed resistor. The DC feed current is programmed by a network connected between this pin and RSN. CAS Capacitor 17 Anti-saturation capacitor. An external capacitor is connected to this pin to filter battery voltage when operating in anti-saturation region. TMG − 7 Thermal management. An external resistor is connected between this pin and VBAT to offload power from SLIC. NC − 11, 12, 18, 19, 25 Pin Description No Connect. 6 October 8, 2003 IDT821621 LONG HAUL SLIC FUNCTIONAL DESCRIPTION OFF-HOOK DETECTOR The IDT821621 implements the basic telephone line interface functions. It provides many user programmable features including 2-wire impedance matching, loop-detect threshold and ring-trip threshold setting, constant current feeding, 4-wire to 2-wire gain setting, etc. The following sections describe these functions in detail. The off-hook detector monitors the hook switch of the loop during Active or Standby state. The output of the DET pin goes low when an off-hook event is detected. The loop-detect threshold is programmed by an external resistor RD, which is connected between the RD and AGND pins. See Figure 1 for details. SLIC STATES CONTROL The IDT821621 can be operated in Disconnect, Ringing, Active or Standby state. A combination of the control pins C2 and C1 select one of the possible four operating states. See Table 2 for details. The IDT821621 provides an off-hook detector and a ring-trip detector on chip to support the necessary signaling functions. The selection of the detectors is based on the SLIC operating state. The output of the detectors is reported through the DET pin. Once a hook switch event or ring-trip event occurs, the DET pin goes low. ! Control Pins A(TIP) DET Output 0 Disconnect Ring-trip Detector 0 1 Ringing Ring-trip Detector 2 1 0 Active Off-hook Detector 3 1 1 Standby Off-hook Detector C1 0 0 1 510 I ON = ---------RD Disconnect CD 415 I OFF = ---------RD The R-C network, formed by the capacitor CD and the resistor RD, determines the on-hook to off-hook time constant. The value of CD for a typical on-hook to off-hook time constant of 0.5 ms is calculated by: 0.5ms C D = ----------------RD Ringing RING-TRIP DETECTOR Figure 2 shows a general ringing circuit for the IDT821621. During Ringing state, the on-chip ring relay driver (RINGOUT) is activated and the ringing source is connected by the ring relay to the Tip and Ring lines through the resistors R1 and R2. Active The ring-trip detector monitors the loop status and reports it via the DET pin. When the loop goes off-hook, the bridging resistors RB1, RB2, R3 and R4, and the filter capacitors CRT1 and CRT2 cause the voltage on DB to go positive with respect to DA and the DET pin goes low. If RLMAX is the maximum line resistance to be detected as an offhook, the bridging resistors should be chosen as that: Standby In Standby state, most of the internal circuitry is powered down, resulting in low power dissipation. The off-hook detection function operates normally, but signal transmission is not enabled. This state allows for monitoring off-hook transitions while maintaining lowest possible power consumption. Functional Description RD The loop current threshold ION and IOFF are calculated by the following equations: In Active state, the SLIC is fully functional. The standard battery convention applies. All signal transmission and loop supervision functions are active. The status of the off-hook detector is gated to the DET pin. ! Off-hook Detector Figure 1 Loop-Detect Threshold Setting When the SLIC is in Ringing state, the ring relay driver (RINGOUT) is activated and the TIP and RING outputs are in high impedance condition. The ringing source is connected by an external ring relay to the line. In Ringing state, the status of the ring-trip detector is reported by the DET pin. ! Two-wire Interface RD When the SLIC is in Disconnect state, both the TIP and RING outputs are in high impedance condition. In this state, the off-hook detector is inoperative and the power dissipation reduces to the lowest. The Disconnect state is useful for out-of-service lines. ! C2 AGND B(RING) Two-Wire Status C2 Digital Interface DET Table 2 — SLIC Operating States State C1 SLIC R B2 ( R LMAX + R FEED ) R B1 ---------- = ---------= ------------------------------------------------R LMAX R3 R4 Where: RFEED = R1 + R2 If the line resistance is less than RLMAX, it means that an off-hook event occurs, otherwise, the loop is in on-hook state. 7 October 8, 2003 IDT821621 LONG HAUL SLIC KR The IDT821621 provides constant-current feeding as shown in Figure 4. RINGOUT 60 RB1 + Ringing Source DC FEEDING SLIC Ring Relay Note 2 RB2 - Note 3 DA CRT2 R2 VAB (volts) R1 CRT1 R3 DB Note 1 R4 KR RF Tip Line KR A(TIP) RF Ring Line B(RING) 0 Figure 2 Ring-trip Detection 30 IL (mA) Figure 4 DC Feeding Characteristics RELAY DRIVERS CONTROL Notes: The IDT821621 provides an on-chip ring relay driver (RINGOUT) to control the external ring relay. This ring relay driver is active only in Ringing state. It is an internal transistor with the emitter internally connected to BGND and the collector as the driver output (see Figure 3). During ringing, the ring relay driver is activated and the ringing source is connected by an external ring relay to the Tip and Ring lines through ring feed resistors. ′ ′ 1250 1. V AB = I L R L = ------------------------------------RL ,where R L = R L + 2R F ′ R DC1 + R DC2 R +R 300 R +R 300 DC1 DC2 2. VAB = 0.857 ( V BAT + 3.3 ) – I L ------------------------------------ DC1 DC2 3. V AB = 0.857 ( V BAT + 1.2 ) – I L ------------------------------------ The IDT821621 also provides three additional relay drivers (RYOUT1, RYOUT2 and RYOUT3) on the chip. All of them are opencollector drivers with emitters internally connected to BGND. They allow for direct operation of external test relays. The digital pins D1 to D3 are used to control the relay drivers RYOUT1, RYOUT2 and RYOUT3 respectively. Logic low on D1 to D3 activates their respective relay drivers. The feed current is programmable. Two resistors RDC1 and RDC2, and a capacitor CDC form the network for programming the feed current. See Figure 5. A(TIP) RSN a RYOUT1 RYOUT2 RYOUT3 RINGOUT RL RDC1 IL SLIC b BGND RDC2 BGND B(RING) Figure 3 Relay Drivers Schematic CDC RDC Feed current is programmed by RDC1 and RDC2. Figure 5 DC Feed Programming Circuit The feed current IFEED is calculated by the following equation: 1250 I FEED = -----------------------------------R DC1 + R DC2 An external capacitor CCAS connected to the CAS pin is used to filter noise that may originate from the battery source and prevent the output amplifiers from saturating. The value of this anti-saturation capacitor is Functional Description 8 October 8, 2003 IDT821621 LONG HAUL SLIC THERMAL MANAGEMENT calculated by the equation below: 1 C CAS = ---------------------------5 1.7 • 10 πf C The IDT821621 uses a power management technique of offloading the thermal energy from the SLIC to an external resistor RTMG. RTMG is connected between the TMG and VBAT pins as shown in Figure 13. This resistor shares some of the loop current and limits the on-chip power dissipation in Active state. Where, fC is the desired filter cut-off frequency. IMPEDANCE MATCHING The selection of RTMG normally needs to satisfy the following condition: with the programmed loop current being fed into a short circuit loop from the nominal battery, all of the loop current is supplied by RTMG. So, RTMG can be calculated by the equation below: The two-wire AC input impedance R2WIN is programmed by means of an external impedance (RT) connected between the RSN and VTX pins (see Figure 13). RT is calculated by the following equation: R T = 250 ( R 2WIN – 2R F ) V BAT – 8V R TMG ≥ -------------------------- – 70Ω I LOOP Where, RF is the value of the fuse resistor. Note that when computing RT, the internal current amplifier pole and any external stray capacitance between the RSN and VTX pins must be taken into account. The power dissipated in the resistor RTMG during Active state is: 2 P RTMG RECEIVE GAIN SETTING The 4-wire to 2-wire gain (G42L) is defined as the receive gain. It is calculated by the following equation: G 42L ( V BAT – 8V – ( I L • R L ) ) - • R TMG = ----------------------------------------------------------2 ( R TMG + 70Ω ) The power dissipated in the SLIC during Active state is: 2 P SLIC = V BAT • I L – P RTMG – R L ( I L ) + 0.12W RL 500R T = ----------- • -------------------------------------------------------R RX R T + 250 ( R L + 2R F ) Where, RL is the terminating impedance; RRX is connected between VRX and RSN; RT is defined above; RF is the fuse resistor. See Figure 11 for details. Functional Description 9 October 8, 2003 IDT821621 LONG HAUL SLIC DC ELECTRICAL CHARACTERISTICS Table 3 — Absolute Maximum Ratings Rating Com’l & Ind’l Unit Power Supply Voltage VCC -0.4 to +7 V Battery Voltage VBAT 0.4 to -70 V Voltage on Any Pin with Respect to Ground (Low Voltage Portion) -0.4 to VCC+0.4 V Voltage on Any Pin with Respect to Ground (High Voltage Portion) +1 to VBAT V 1.7 W -65 to +150 °C 500 V Package Power Dissipation Storage Temperature ESD (Human Body Model) Note: Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. Table 4 — Recommended Operating Conditions Parameters Min. Max. Unit Ambient Temperature -40 +85 °C Power Supply Voltage VCC +3.3 V nominal +5 V nominal 3.15 4.75 3.45 5.25 V V Battery Voltage VBAT -58 -19 V DC Electrical Characteristics 10 October 8, 2003 IDT821621 LONG HAUL SLIC AC ELECTRICAL CHARACTERISTICS Unless otherwise stated, test conditions are VBAT = -52 V, VCC = +5 V, RL= 600 Ω, RDC1 = RDC2 = 27.17 kΩ, RTMG = 2350 Ω, RD = 35.4 kΩ, no fuse resistors, CHP = 0.22 µF, CDC = 0.1 µF, CCAS = 0.33 µF, D1 = 1N400x, 2-wire AC input impedance is a 600 Ω resistance synthesized by the programming network as shown below. VTX RT1 = 75 kΩ CT1 = 120 pF RT2 = 75 kΩ RSN RRX = 150 kΩ VRX Figure 6 Two-Wire AC Input Impedance Programming Network Table 5 — Transmission Performance Description 2-wire Return Loss Test Conditions (See Figure 7) 200 Hz to 3.4 kHz Min. Typ. Max. 26 Analog Output VTX Impedance -50 20 Ω +50 mV Overload Level, 2-wire and 4-wire Active state 2.5 Vpk Overload Level On-hook, RLAC = 600 Ω 0.77 Vrms THD, Total Harmonic Distortion 0 dBm -64 -50 +7 dBm -55 -40 0 dBm, RLAC = 600 Ω THD, On-hook Note dB 3 Analog Output VTX Offset Voltage Unit dB -36 Table 6 — Longitudinal Capability Description Test Conditions (See Figure 8, Figure 9) Min. 200 Hz to 1 kHz 0 to 70 °C -40 to +85 °C 63 58 1 kHz to 3.4 kHz 0 to 70 °C -40 to +85 °C 58 53 Longitudinal Signal Generation 4-L 200 Hz to 3.4 kHz 40 Longitudinal Current per pin Active state 20 Longitudinal Impedance at A or B 0 to 100 HZ Longitudinal to metallic L-T, L-4 balance AC Electrical Characteristics Typ. Max. Unit Note dB 27 25 11 35 mArms Ω/pin October 8, 2003 IDT821621 LONG HAUL SLIC Table 7 — Idle Channel Noise Description Test Conditions Min. Typ. Max. Unit C-message Weighted Noise RL = 600 Ω RL = 600 Ω 0 to 70°C -40 to +85°C 7 +10 +12 dBrnc Psophometric Weighted Noise RL = 600 Ω RL = 600 Ω 0 to 70°C -40 to +85°C -83 -80 -78 dBmp Typ. Max. Unit Note Table 8 — Insertion Loss and Balance Return Loss Signal Description Test Conditions (See Figure 10, Figure 11) Min. Gain Accuracy, 4- to 2-wire 0 dBm, 1 kHz -0.20 Gain Accuracy, 2- to 4-wire, 4- to 4-wire 0 dBm, 1 kHz -6.22 Gain Accuracy, 4- to 2-wire On-hook -0.35 Gain Accuracy, 2- to 4-wire, 4- to 4-wire On-hook -6.37 Gain Accuracy Over Frequency 300 to 3.4 kHz, relative to 1 kHz -0.15 +0.15 Gain Tracking +3 dBm to -55 dBm, relative to 0 dBm -0.15 +0.15 Gain Tracking, On-hook 0 dBm to -37 dBm +3 dBm to 0 dBm -0.15 -0.35 +0.15 +0.35 Group Delay 0 dBm, 1 kHz Note +0.20 -6.02 -5.82 +0.35 -6.02 -5.67 dB µs 4 Table 9 — Line Characteristics Description Test Conditions Min. Typ. Max. 26 IL, Short Loops, Active State RLDC = 600 Ω 20 23 IL, Long Loops, Active State RLDC = 1930 Ω, VBAT = -42.75 V, TA = 25 °C 18 19 IL, Accuracy, Standby State VBAT – 3V I L = ----------------------------------R L + 200 0.7IL IL 18 30 TA = 25 °C Constant-current region IL, Loop Current, Disconnect State RL = 0 IL LIM Active, A and B to ground VAB, Open Circuit Voltage VBAT = -52 V 1.3IL 100 Unit Note mA µA 65 mA -42.75 -44 V Min. Typ. Table 10 — Power Supply Rejection Ratio (VRipple=100 mVrms), Active State Description Test Conditions VCC 50 Hz to 3.4 kHz 30 40 VBAT 50 Hz to 3.4 kHz 28 50 Effective Internal Resistance CAS pin to VBAT AC Electrical Characteristics 335 12 Max. Unit Note dB kΩ October 8, 2003 IDT821621 LONG HAUL SLIC Table 11 — Power Dissipation Description Test Conditions Min. Typ. Max. On-hook, Disconnect State 18 70 On-hook, Standby State 32 100 On-hook, Active State 210 270 Off-hook, Standby State RL = 600 Ω 930 1200 Off-hook, Active State RL = 300 Ω, RTMG = 2350 Ω 760 900 Typ. Max. Unit Note mW Table 12 — Supply Currents, Battery = -48V Description Test Conditions Min. ICC, On-hook VCC Supply Current Disconnect state Standby state Active state 2.6 1.9 4.3 4.0 4.0 8.5 IBAT, On-hook VBAT Supply Current Disconnect state Standby state Active state 0.25 0.55 3.8 1.0 1.5 4.8 Typ. Max. Unit Note mA Table 13 — Receive Summing Node (RSN) Description Test Conditions Min. Unit RSN DC Voltage IRSN = 0 mA 0 RSN Impedance 200 Hz to 3.4 kHz 10 20 Ω Typ. Max. Unit Note V Table 14 — Logic Inputs (C2-C1 and D3-D1) Description Test Conditions Min. VIH, Input High Voltage 2.0 VIL, Input Low Voltage 0.8 IIH, Input High Current -75 IIL, Input Low Current -400 40 Note V µA Table 15 — Logic Output (DET) Description Test Conditions VOL, Output Low Voltage IOUT = 0.3 mA, 15 kΩ to VCC VOH, Output High Voltage IOUT = -0.1 mA, 15 kΩ to VCC Min. Typ. Max. Unit Note 0.4 V 2.4 Table 16 — Ring-trip Detector Input (DA, DB) Description Test Conditions Bias Current Offset Voltage AC Electrical Characteristics Source Resistance = 2 MΩ 13 Min. Typ. -500 -50 -100 0 Max. Unit Note nA +100 mV October 8, 2003 IDT821621 LONG HAUL SLIC Table 17 — Loop Detector Description Test Conditions (See Figure 12) Min. Typ. Max. On Threshold RD = 35.4 kΩ 11.5 17.3 Off Threshold RD = 35.4 kΩ 9.4 14.1 Hysteresis RD = 35.4 kΩ 0 4.4 Unit Note mA Table 18 — Relay Driver Output (RINGOUT, RYOUT1, RYOUT2, RYOUT3) Description Test Conditions Min. Typ. Max. Unit +0.3 +0.7 V 100 µA On Voltage IOL = 40 mA Off Leakage VOH = +5 V Zener Breakover IZ = 100 µA 9.4 Zener On Voltage IZ = 30 mA 10 AC Electrical Characteristics 14 Note V October 8, 2003 IDT821621 LONG HAUL SLIC TEST CIRCUITS ZD A (TIP) VTX R RT1 CT1 VS SLIC AGND VM RT2 R B (RING) ZD: The desired impedance (e.g., the characteristic impedance of the line) RRX RSN Return Loss = -20 log (2 VM / VS) Figure 7 Two-Wire Return Loss A (TIP) 1 << RL 2πfC VTX RL 2 C VAB VL SLIC AGND RT RL 2 B (RING) RSN Longitudinal to Two-Wire Balance = 20 log (VAB / VL) Longitudinal to Four-Wire Balance = 20 log (VTX / VL) Figure 8 Longitudinal Balance Test Circuits 15 October 8, 2003 IDT821621 LONG HAUL SLIC A (TIP) VTX RL 2 VL SLIC AGND RT RL 2 B (RING) RRX RSN VRX 4-L Long. Sig. Gen. = 20 log (V L / V RX) Figure 9 Four-Wire Longitudinal Signal Generation A (TIP) VTX RL 2 VL VAB SLIC AGND RT RL 2 B (RING) RSN RRX Gain 2-4 = 20 log (VTX / VAB) Figure 10 Two-to-Four Wire Gain Test Circuits 16 October 8, 2003 IDT821621 LONG HAUL SLIC A (TIP) RL VTX RT SLIC AGND VAB B (RING) RRX RSN VRX Gain 4-2 = 20 log (VAB / VRX) Gain 4-4 = 20 log (VTX / VRX) Figure 11 Four-to-Two Wire Gain and Four-to-Four Wire Gain VCC 6.2 kΩ A (TIP) DET 15 pF SLIC RL B (RING) Figure 12 Loop Detector Switching Test Circuits 17 October 8, 2003 IDT821621 LONG HAUL SLIC BASIC APPLICATION CIRCUIT IDT821621 Ring Relay KR Ringing Source RINGOUT RB1 + RB2 R2 CRT2 R1 CRT1 R3 +5 V DA VCC DB R4 KR Tip Line Ring Line KR RD 2.2 nF RF A (TIP) HPA CHP HPB B (RING) RF 2.2 nF RYOUT1 CD RD VTX VTX RT RRX RSN VRX RDC2 RDC1 RDC CDC RYOUT2 RYOUT3 AGND D3 D2 D1 BGND VBREF BAT C2 C1 VBAT DET D1 TMG RTMG CAS CCAS Figure 13 Basic Application Circuit Basic Application Circuit 18 October 8, 2003 IDT821621 LONG HAUL SLIC ORDERING INFORMATION IDT XXXXXX X Dev ice Ty pe Package X Process/ Temperature Range Blank Industrial (-40 °C to +85 °C) J Plastic Leaded Chip Carrier (PLCC, PL32) 821621 Long Haul SLIC Data Sheet Document History 10/08/2003 pgs. 1, 10, 12, 13 CORPORATE HEADQUARTERS 2975 Stender Way Santa Clara, CA 95054 for SALES: 800-345-7015 or 408-727-5116 fax: 408-492-8674 www.idt.com for Tech Support: 408-330-1552 email:[email protected] The IDT logo is a registered trademark of Integrated Device Technology, Inc. Ordering Information 19 October 8, 2003