19-3798; Rev 0; 09/06 Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch The MAX4670 is an integrated T1/E1/J1 analog protection switch for 1+1 and N+1 line-card redundancy applications. It protects two T1/E1/J1 ports by combining eight SPDT switches in a single package. The switch is optimized for high-return loss and pulse-template performance in T1/E1/J1 long-haul and short-haul applications. The part offers built-in chip-side surge protection capability for short-haul intrabuilding applications. The MAX4670 replaces two diode arrays or two transient voltage suppressors (TVSs) and four dual-SPDT relays, significantly reducing board space and simplifying PC board routing. The MAX4670 pinout is targeted for T1/E1/J1 applications, resulting in a simplified layout when interfacing with standard line transformers and line interface units (LIUs). The MAX4670 has four 1.0Ω (max) on-resistance switches with 60pF/40pF on-/off-capacitances for interfacing to the LIU transmitter outputs. The MAX4670 also includes four 10Ω (max) on-resistance switches with low 24pF/12pF on-/off-capacitances for interfacing to the LIU receiver inputs. Four logic inputs control the receive/ transmit pairs, in addition to a SWITCH input that connects all switches to the system’s protection bus. The MAX4670 operates from a single +2.7V to +3.6V supply and is available in 32-pin thermally enhanced TQFN package. The MAX4670 is specified over the -40°C to +85°C operating temperature range. Features ♦ Single +3.3V Supply Voltage ♦ Quad-DPDT/Octal-SPDT Switches Support Two T1/E1/J1 Ports ♦ Low RON ♦ 0.7Ω (typ) in Transmit Path; 5Ω (typ) in Receive Path ♦ Low CON/COFF 60pF/40pF (typ) in Transmit Path 24pF/12pF (typ) in Receive Path ♦ Chip Surge Protection IEC 61000-4-5 (8µs to 20µs Surge) Class 2 (±1kV) ♦ -70dB (typ) Crosstalk/Off-Isolation (3MHz) ♦ Small, 32-Pin TQFN Package Ordering Information PINPACKAGE PART* SURGE PROTECTION PKG CODE YES T3255-4 32 TQFN (5mm x 5mm) MAX4670ETJ *This part operates at a -40°C to +85°C temperature range. Pin Configuration Applications 17 NO6 18 NC6 19 NO5 20 NC5 21 NO4 Multiservice Switches 22 NC4 TOP VIEW 24 NC3 Edge Routers 23 NO3 Optical Multiplexers (ADMs, M13s, etc.) Base Station Controllers (Wireless Infrastructure Equipment) NO2 25 16 NC7 NC2 26 15 NO7 Media Gateways (VoIP) NO1 27 14 NC8 NC1 28 13 NO8 12 COM8 COM1 29 COM2 30 11 COM7 INA 31 10 IND V+ 32 9 V+ SWITCH 8 COM6 7 COM5 6 INC 5 GND 4 COM4 3 *NOTE: EXPOSED PADDLE CONNECTED TO GND COM3 2 *EP INB 1 Functional Diagram/Truth Table appears at end of data sheet. MAX4670 TQFN ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX4670 General Description MAX4670 Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) V+, IN_, SWITCH ......................................................-0.3V to +4V COM_, NO_, NC_ (Note 1) ...........................-0.3V to (V+ + 0.3V) Continuous Current NO_, NC_, COM_ (Tx interface)..................................±150mA NO_, NC_, COM_ (Rx interface) .................................±100mA Peak Currents NO_, NC_, COM_ (Tx interface) (pulsed at 1ms, 10% duty cycle) ................................±300mA NO_, NC_, COM_ (Rx interface) (pulsed at 1ms, 10% duty cycle) ................................±200mA Peak Surge Currents Poised at 8µs ..................................................................21.4A Poised at 20µs ................................................................11.9A Continuous Power Dissipation (TA = +70°C) 32-Pin TQFN (derate 21.3mW/°C above +70°C) .......1702mW 38-Pin TSSOP (derate 13.7mW/°C above +70°C) .....1096mW Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range .............................-65°C to +150°C Junction Temperature ......................................................+150°C Lead Temperature (soldering, 10s) .................................+300°C Note 1: Signals on NO_, NC_, COM_ exceeding V+ or GND are clamped by internal diodes. Limit forward-diode current to maximum current rating. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V+ = +2.7V to +3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C, unless otherwise noted.) (Notes 2, 3) PARAMETER SYMBOL CONDITIONS MIN TYP MAX 5 9 UNITS Rx INTERFACE On-Resistance On-Resistance Match Between Channels (Note 4) On-Resistance Flatness (Note 4) RON V+ = 3V, ICOM_ = 10mA, VNO_ or VNC_ = 1.5V TA = +25°C TA = TMIN to TMAX 10 ∆RON V+ = 3V, ICOM_ = 10mA, VNO_ or VNC_ = 1.5V TA = +25°C 1.0 TA = TMIN to TMAX 1.3 V+ = 3V; ICOM_ = 10mA; VNO_ or VNC_ = 1.0V, 1.5V, 2.0V TA = +25°C RFLAT(ON) INO(OFF) NO_ or NC_ Off-Leakage Current INC (OFF) COM_ On-Leakage Current ICOM(ON) 2.0 Ω Ω 3.0 Ω TA = TMIN to TMAX 3.4 V+ = 3.6V; VCOM_ = 0.3V, 3.3V; VNO_ or VNC_ = 3.3V, 0.3V -1 +1 µA V+ = 3.6V; VCOM_ = 0.3V, 3.3V; VNO_ or VNC_ = 3.3V, 0.3V or floating -1 +1 µA Tx INTERFACE On-Resistance (Note 5) On-Resistance Match Between Channels (Notes 3, 5) On-Resistance Flatness (Notes 5, 6) 2 RON ∆RON RFLAT(ON) V+ = 3V, ICOM_ = 100mA, TA = +25°C VNO_ or VNC_ = 1.5V TA = TMIN to TMAX T V+ = 3V, ICOM_ = 100mA, A = +25°C VNO_ or VNC_ = 1.5V TA = TMIN to TMAX V+ = 3V; ICOM_ = 100mA; VNO_ or VNC_ = 1.0V, 1.5V, 2.0V TA = +25°C 0.7 0.9 1.0 0.03 0.150 0.175 0.1 Ω Ω 0.18 Ω TA = TMIN to TMAX _______________________________________________________________________________________ 0.2 Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch (V+ = +2.7V to +3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C, unless otherwise noted.) (Notes 2, 3) PARAMETER SYMBOL CONDITIONS NO_ or NC_ Off-Leakage Current INO(OFF), INC(OFF) V+ = 3.6V; VCOM_ = 0.3V, 3.3V; VNO_ or VNC_ = 0.3V, 3.3V COM_ On-Leakage Current ICOM(ON) V+ = 3.6V; VCOM_ = 0.3V, 3.3V; VNO_ or VNC_ = 0.3V, 3.3V or floating MIN TYP MAX UNITS -1 +1 µA -1 +1 µA DYNAMIC CHARACTERISTICS Turn-On Time tON Turn-Off Time tOFF Break-Before-Make Delay tD VNO_ or VNC_ = 1.5V, RL = 50Ω, CL = 35pF, Figure 2 TA = +25°C 400 TA = TMIN to TMAX 750 VNO or VNC = 1.5V, RL = 50Ω, CL = 35pF, Figure 2 TA = +25°C 200 TA = TMIN to TMAX 750 ns ns RL = 50Ω, CL = 35pF, Figure 3 80 Rx interface 8 Tx interface 20 Rx interface 300 Tx interface 300 RL = 50Ω, CL = 35pF, f < 3MHz -65 VISO2 RL = 50Ω, CL = 35pF, 3MHz < f < 30MHz -58 VISO1 RL = 50Ω, CL = 35pF, f < 3MHz -60 RL = 50Ω, CL = 35pF, 3MHz < f < 30MHz -40 RL = 50Ω, CL = 35pF, f < 3MHz -65 VCT2 RL = 50Ω, CL = 35pF, 3MHz < f < 30MHz -50 VCT1 RL = 50Ω, CL = 35pF, f < 3MHz -78 RL = 50Ω, CL = 35pF, 3MHz < f < 30MHz -30 Charge Injection Q On-Channel 3dB Bandwidth BW VGEN = 1.5V, RGEN = 0Ω, CL = 1nF, Figure 4 VISO1 ns pC MHz Rx interface Off-Isolation (Note 7) dB Tx interface VISO2 VCT1 Rx interface, Figure 5 Crosstalk (Note 8) dB Tx interface, Figure 5 VCT2 NC_ or NO_ Off-Capacitance COM_ On-Capacitance COFFRX Rx interface f = 1MHz, Figure 6 12 COFFTX Tx interface f = 1MHz, Figure 6 40 CCOM(ON)TX CCOM(ON)RX f = 1MHz Rx interface 24 Tx interface 60 pF pF _______________________________________________________________________________________ 3 MAX4670 ELECTRICAL CHARACTERISTICS (continued) ELECTRICAL CHARACTERISTICS (continued) (V+ = +2.7V to +3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C, unless otherwise noted.) (Notes 2, 3) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 0.5 V µA DIGITAL I/O (IN_, SWITCH ) Input-Low Voltage VIL V+ = 2.7V Input-High Voltage VIH V+ = 3.6V 1.4 Input Leakage Current IIL VIN_ = 0 or V+, V SWIT C H = 0 or V+ -1 +1 2.7 3.6 V 10 µA V SUPPLY Operating Voltage Range V+ Supply Current I+ V+ = 3.6V, VIN_ = V SWIT C H = 0 or V+ The algebraic convention is used in this data sheet. The most negative value is shown in the minimum column. Devices are 100% tested at hot and room and guaranteed by design at cold. ∆RON = RON(MAX) - RON(MIN). Guaranteed by design. Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the specified analog signal ranges. Note 7: Off-isolation = 20log10 [VCOM_ / (VNO_ or VNC_)], VCOM_ = output, VNO_ or VNC_ = input to off switch. Note 8: Crosstalk between any two switches. Note 2: Note 3: Note 4: Note 5: Note 6: Typical Operating Characteristics (V+ = 3.0V, TA = +25°C, unless otherwise noted.) V+ = 3V TA = +85°C 0.8 TA = +25°C 0.6 0.4 TA = -40°C 0.6 0.2 0 0 0.6 1.2 1.8 VCOM_ (V) 4 2.4 3.0 3.6 9 8 V+ = 2.7V 7 6 5 4 V+ = 3.6V 0.5 10 ON-RESISTANCE (Ω) V+ = 2.7V 0.7 1.0 ON-RESISTANCE (Ω) 0.8 ON-RESISTANCE vs. COM_VOLTAGE (Rx INTERFACE) MAX4670 toc02 1.2 MAX4670 toc01 0.9 ON-RESISTANCE vs. COM_ VOLTAGE OVER TEMPERATURE (Tx INTERFACE) MAX4670 toc03 ON-RESISTANCE vs. COM_VOLTAGE (Tx INTERFACE) ON-RESISTANCE (Ω) MAX4670 Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch V+ = 3.6V V+ = 3V 3 0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 VCOM_ (V) 0 0.6 1.2 1.8 VCOM_ (V) _______________________________________________________________________________________ 2.4 3.0 3.6 Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch ON-RESISTANCE vs. COM_ VOLTAGE OVER TEMPERATURE (Rx INTERFACE) ON-RESISTANCE (Ω) 8 LEAKAGE CURRENT (nA) TA = +25°C 6 4 MAX4670toc05 TA = +85°C 10 10 MAX4670 toc04 12 COM_ LEAKAGE CURRENT vs. TEMPERATURE (Tx INTERFACE) 1 0.1 TA = -40°C 2 0 0.01 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 10 35 60 NC_/NO_ LEAKAGE CURRENT vs. TEMPERATURE (Tx INTERFACE) COM_ LEAKAGE CURRENT vs. TEMPERATURE (Rx INTERFACE) LEAKAGE CURRENT (nA) MAX4670toc06 1 NC_ 0.1 NO_ 85 10 0.01 1 0.1 0.01 -15 35 10 60 85 -40 -15 10 35 60 85 TEMPERATURE (°C) TEMPERATURE (°C) NC_/NO_ LEAKAGE CURRENT vs. TEMPERATURE (Rx INTERFACE) TURN-ON TIME vs. SUPPLY VOLTAGE (Tx INTERFACE) MAX4670 toc08 10 NC_ NO_ 0.1 280 TURN-ON TIME (ns) 1 MAX4670 toc09 -40 LEAKAGE CURRENT (nA) -15 TEMPERATURE (°C) 10 LEAKAGE CURRENT (nA) -40 VCOM_ (V) MAX4670 toc07 0 250 220 190 160 130 100 0.01 -40 -15 10 35 TEMPERATURE (°C) 60 85 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 SUPPLY VOLTAGE (V) _______________________________________________________________________________________ 5 MAX4670 Typical Operating Characteristics (continued) (V+ = 3.0V, TA = +25°C, unless otherwise noted.) Typical Operating Characteristics (continued) (V+ = 3.0V, TA = +25°C, unless otherwise noted.) 30 20 10 tON 85 80 75 70 tOFF 65 60 0 250 225 200 175 150 125 100 -40 -15 10 35 85 60 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) TEMPERATURE (°C) TURN-OFF TIME vs. TEMPERATURE (Tx INTERFACE) TURN-ON/OFF TIMES vs. TEMPERATURE (Rx INTERFACE) CHARGE INJECTION vs. COM_ VOLTAGE (Tx INTERFACE) 34 32 30 28 26 24 40 30 tOFF 20 150 10 MAX4670 toc15 50 TURN-ON/OFF TIMES (ns) 36 tON CHARGE INJECTION (pC) V+ = 3V MAX4670 toc14 60 MAX4670 toc13 40 38 V+ = 3V 300 275 3.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 TURN-OFF TIME (ns) 400 375 350 325 TURN-ON TIME (ns) 40 TURN-ON TIME vs. TEMPERATURE (Tx INTERFACE) MAX4670 toc11 90 TURN-ON/OFF TIMES (ns) 50 TURN-OFF TIME (ns) 95 MAX4670 toc10 60 TURN-ON/OFF TIMES vs. SUPPLY VOLTAGE (Rx INTERFACE) MAX4670 toc12 TURN-OFF TIME vs. SUPPLY VOLTAGE (Tx INTERFACE) 120 90 60 30 22 0 20 -15 10 35 60 -15 10 35 60 85 0 1.0 1.5 2.0 TEMPERATURE (°C) VCOM (V) CHARGE INJECTION vs. COM_ VOLTAGE (Rx INTERFACE) FREQUENCY RESPONSE (Tx INTERFACE) FREQUENCY RESPONSE (Rx INTERFACE) ON LOSS 0 20 0 ON LOSS -20 6 -40 OFF-ISOLATION -60 -80 4 -100 2 CROSSTALK 1.0 1.5 VCOM_ (V) 2.0 2.5 3.0 CROSSTALK -60 -80 OFF-ISOLATION -120 -140 0.5 -40 -100 -120 0 3.0 -20 ON LOSS (dB) ON LOSS (dB) 8 2.5 MAX4670 toc18 20 MAX4670 toc16 10 0 0.5 TEMPERATURE (°C) 12 6 0 -40 85 MAX4670 toc17 -40 CHARGE INJECTION (pC) MAX4670 Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch 0.1 1 10 100 FREQUENCY (MHz) 1000 -140 0.1 1 10 100 FREQUENCY (MHz) _______________________________________________________________________________________ 1000 Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch PIN NAME — N.C. No Connection. Not internally connected. FUNCTION 1 INB Transmitter 1 Logic Control. Drive INB high to connect NC3 and NC4. INB logic is ignored when SWITCH asserts low. 2 COM3 Common Terminal 3. Transmitter 1 positive differential terminal. Connect COM3 to the transmit interface transformer. 3 COM4 Common Terminal 4. Transmitter 1 negative differential terminal. Connect COM4 to the transmit interface transformer. 4 GND Ground 5 INC Transmitter 2 Logic Control. Drive INC high to connect NC5 and NC6. INC logic is ignored when SWITCH asserts low. 6 COM5 Common Terminal 5. Transmitter 2 positive differential terminal. Connect COM5 to the transmit interface transformer. 7 COM6 Common Terminal 6. Transmitter 2 negative differential terminal. Connect COM6 to the transmit interface transformer. 8 SWITCH 9, 32 V+ Positive Supply Voltage. Bypass V+ to ground with a 0.1µF ceramic capacitor. 10 IND Receiver 2 Logic Control. Drive IND high to connect NC7 and NC8. IND logic is ignored when SWITCH asserts low. 11 COM7 Common Terminal 7. Receiver 2 positive differential terminal. Connect COM7 to the receive interface transformer. 12 COM8 Common Terminal 8. Receiver 2 negative differential terminal. Connect COM8 to the receive interface transformer. 13 NO8 Normally Open Terminal 8. Receiver 2 differential protection terminal. Connect NO8 to the protection bus. 14 NC8 Normally Closed Terminal 8. Receiver 2 differential terminal. Connect NC8 to LIU receiver. 15 NO7 Normally Open Terminal 7. Receiver 2 differential protection terminal. Connect NO7 to the protection bus. 16 NC7 Normally Closed Terminal 7. Receiver 2 differential terminal. Connect NC7 to LIU receiver. 17 NO6 Normally Open Terminal 6. Transmitter 2 differential protection terminal. Connect NO6 to the protection bus. 18 NC6 Normally Closed Terminal 6. Transmitter 2 differential terminal. Connect NC6 to LIU receiver. 19 NO5 Normally Open Terminal 5. Transmitter 2 differential protection terminal. Connect NO5 to the protection bus. 20 NC5 Normally Closed Terminal 5. Transmitter 2 differential terminal. Connect NC5 to LIU receiver. 21 NO4 Normally Open Terminal 4. Transmitter 1 differential protection terminal. Connect NO4 to the protection bus. Protection Switch Control. Assert SWITCH low to connect all switches to protection bus. When SWITCH asserts low, SWITCH overrides all IN_ inputs. Assert SWITCH high to enable all switches and let the respective IN control the switches. _______________________________________________________________________________________ 7 MAX4670 Pin Description Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch MAX4670 Pin Description (continued) PIN NAME 22 NC4 Normally Closed Terminal 4. Transmitter 1 differential terminal. Connect NC4 to LIU receiver. FUNCTION 23 NO3 Normally Open Terminal 3. Transmitter 1 differential protection terminal. Connect NO3 to the protection bus. 24 NC3 Normally Closed Terminal 3. Transmitter 1 differential terminal. Connect NC3 to LIU receiver. 25 NO2 Normally Open Terminal 2. Receiver 2 differential protection terminal. Connect NO2 to the protection bus. 26 NC2 Normally Closed Terminal 2. Receiver 1 differential terminal. Connect NC2 to LIU receiver. 27 NO1 Normally Open Terminal 1. Receiver 1 differential protection terminal. Connect NO1 to the protection bus. 28 NC1 Normally Closed Terminal 1. Receiver 1 differential terminal. Connect NC1 to LIU receiver. 29 COM1 Common Terminal 1. Receiver 1 positive differential terminal. Connect COM1 to the receive interface transformer. 30 COM2 Common Terminal 2. Receiver 1 negative differential terminal. Connect COM2 to the receive interface transformer. 31 INA Receiver 1 Logic Control. Drive INA low to connect receiver 1 to the LIU. INA logic is ignored when SWITCH asserts low. EP EP Exposed Paddle. Connect EP to GND or leave unconnected. Detailed Description The MAX4670 is a quad-DPDT/octal-SPDT analog switch optimized for T1/E1/J1 line-card redundancy protection applications. This analog switch is configurable as two differential transmitter and receiver pairs utilized in T1/E1/J1 redundancy architecture. The MAX4670 has four low 0.7Ω on-resistance switches with 60pF and 40pF on- and off-capacitances, respectively, for interfacing to the LIU transmitter inputs. The MAX4670 also includes four 5Ω on-resistance switches with low 24pF and 12pF on- and off-capacitances, respectively, for interfacing to the LIU receiver inputs. The MAX4670 replaces two diode arrays or two transient voltage suppressors and four dual-SPDT relays, significantly reducing board space and simplifying PC board routing. The MAX4670 pinouts are targeted for T1/E1/J1 applications, resulting in a simplified layout when interfacing with standard line transformers and LIUs. Figure 1 is the functional diagram. Logic Inputs (IN_, SWITCH) The MAX4670 four logic inputs (IN_) control the switches in pairs and contain a global logic input (SWITCH) that connects all COMs to their respective NO_ inputs. SWITCH overrides all IN_ inputs when asserted low, thus connecting all NO_ to COM_ outputs (transmitter/receiver 8 pairs to the protection bus). When SWITCH asserts high, IN_ controls the switch pairs. See Table 1. Surge Protection The MAX4670 includes chip-side, surge-protection capability for short-haul intrabuilding applications. The lowcapacitance diodes suppress surge residuals from the primary, line-side protection devices. It is assumed that adequate primary protection is included on the line die of the transformer, as represented in Figures 7–10. Table 2 lists the applicable surge protection setups for E1 interfaces. The MAX4670 surge test was performed per IEC 61000-4-5 Class 2 specifications and passed at ±1kV with only an in-line transformer and primary surge suppressor. The transformer was a Halo TG83-1505NX transformer and the surge suppressor was a Teccor P0640SC. Applications Information Redundancy Architecture Figures 7 through 10 illustrate the MAX4670 used in two different redundancy architectures. There is one backup card for up to N line cards in the system (in this example, N = 3). In the event one of the line cards fails (memory failure, power supply went down, etc.), a system supervisory card issues a command to the switches to reroute the traffic to and from the problem line card to the backup line card. _______________________________________________________________________________________ Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch MAX4670 V+ SWITCH LOW HIGH HIGH MAX4670 RX NO1 COM1 LOW HIGH HIGH COM2 LOW HIGH HIGH NC1 RX NO2 INA NC2 0.6Ω TX NO3 COM3 0.6Ω NC3 0.6Ω TX NO4 0.6Ω LOW HIGH HIGH INA X LOW HIGH INB X LOW HIGH INC X LOW HIGH IND X LOW HIGH NC1/NC2 OFF OFF ON NC3/NC4 OFF OFF ON NC5/NC6 OFF OFF ON NC7/NC8 OFF OFF ON NO1/NO2 ON ON OFF NO3/NO4 ON ON OFF NO5/NO6 ON ON OFF NO7/NO8 ON ON OFF COM4 INB NC4 0.6Ω TX NO5 COM5 0.6Ω NC5 0.6Ω TX NO6 0.6Ω COM6 INC NC6 RX NO7 COM7 NC7 RX NO8 COM8 IND NC8 GND SWITCH Figure 1. Functional Diagram In a switching-card architecture, a common switching card contains all the protection switches for the T1/E1/J1 lines entering the system (see Figures 7 and 8). With an adjacent card architecture, the switches protecting any given line card reside physically in the adjacent line card (see Figures 9 and 10). Receive and transmit interfaces reside in the same board for each T1/E1/J1 port. The diagrams represent the typical interface transformers and resistors recommended for Dallas/Maxim LIUs, such as the DS21Q55. The protection switches are placed in the low-voltage side of the transformer to meet the isolation requirements. Note that there is also a TVS in the line side of the transformers. The receive and transmit resistors provide impedance matching to the T1/E1/J1 transmission cable characteristic impedance. Refer to Application Note 2857 for more information on T1/E1/J1 applications. _______________________________________________________________________________________ 9 MAX4670 Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch Table 1. MAX4670 Truth Table SWITCH INA NC1/NC2 NO1/NO2 LOW X OFF ON HIGH LOW OFF ON HIGH HIGH ON OFF — INB NC3/NC4 NO3/NO4 LOW X OFF ON HIGH LOW OFF ON HIGH HIGH ON OFF The receive interface series resistance is small enough to support LIUs with internal line termination, provided the external 120Ω parallel resistor combination (Rr) is connected, as shown in Figures 7 and 9. While in normal operation, the MAX4670 requires the input and output signals to be within the V+ and GND supply rails. ESD Test Conditions ESD performance depends on a variety of conditions. Contact Maxim for a reliability report that documents test setup, test methodology, and test results. — INC NC5/NC6 NO5/NC6 LOW X OFF ON Human Body Model HIGH LOW OFF ON HIGH HIGH ON OFF — IND NC7/NC8 NO7/NO8 LOW X OFF ON HIGH LOW OFF ON Figure 11 shows the Human Body Model. Figure 12 shows the current waveform it generates when discharged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest, which is then discharged into the test device through a 1.5kΩ resistor. HIGH HIGH ON OFF Table 2. IEC 61000-4-5 Test Conditions TEST CONFIGURATION TEST CONDITIONS Differential Surge (Line to Line) 500V peak, 12A min current, 8µs/20µs surge Common-Mode Surge (Line to GND) 1000V peak, 24A min current, 8µs/20µs surge LIU Interface Recommendations The MAX4670 low 0.7Ω (typ) on-resistance is adequate, even in applications where the LIUs require no external series transmit resistors (Rt = 0 in Figures 8 and 10). However, in some instances, increase the LIU output amplitude to compensate for RON if the LIU supports programmable output amplitude. With LIUs requiring external transmit resistors, it is recommended to reduce Rt by the amount of the typical RON with LIUs requiring external transmit resistors. For example, if the LIU vendor recommends Rt = 9.1Ω, the actual value in the application should be: IEC 1000-4-2 The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment. It does not specifically refer to ICs. The major difference between tests done using the Human Body Model and IEC 1000-4-2 is a higher peak current in IEC 1000-4-2, because series resistance is lower in the IEC 1000-4-2 model. Hence, the ESD withstands voltage measured to IEC 61000-4-2, and is generally lower than that measured using the Human Body Model. Figure 13 shows the IEC 61000-4-2 model, and Figure 14 shows the current waveform for the ±8kV IEC, 61000-4-2 Level 4, ESD Contact Discharge test. The Air-Gap test involves approaching the device with a charged probe. The Contact Discharge method connects the probe to the device before the probe is energized. Machine Model The Machine Model for ESD tests all pins using a 200pF storage capacitor and zero discharge resistance. Its objective is to emulate the stress caused by contact that occurs with handling and assembly during manufacturing. Rt = Rt – RON = 9.1Ω - 0.7 = 8.4Ω 10 ______________________________________________________________________________________ Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch V+ 0.1µF MAX4670 LOGIC INPUT V+ V NO_ OR V NC_ NO_ OR NC_ 50% VINL VOUT COM_ RL 50Ω CL 35pF t OFF IN_ VOUT GND LOGIC INPUT SWITCH OUTPUT ( 0.9 × V0UT 0.9 × VOUT 0V t ON CL INCLUDES FIXTURE AND STRAY CAPACITANCE. RL RL + RON VOUT = VN_ t r < 5ns t f < 5ns VINH LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES THAT HAVE THE OPPOSITE LOGIC SENSE. ) WHERE, VN_ IS VNC_ OR VNO_. Figure 2. Switching Time V+ 0.1µF MAX4670 LOGIC INPUT V+ NC_ VNO_ OR VNC_ 50% VINL VOUT COM_ VINH NO_ RL 50Ω IN_ LOGIC INPUT CL 35pF GND 0.9 × VOUT VOUT tD CL INCLUDES FIXTURE AND STRAY CAPACITANCE. Figure 3. Break-Before-Make Intervals V+ 0.1µF ∆VOUT MAX4670 VOUT V+ RGEN NC_ OR NO_ COM_ VOUT IN_ OFF CL V GEN GND ON OFF IN_ IN_ VINL TO VINH OFF ON OFF Q = (∆V OUT )(C L ) IN DEPENDS ON SWITCH CONFIGURATION; INPUT POLARITY DETERMINED BY SENSE OF SWITCH. Figure 4. Charge Injection ______________________________________________________________________________________ 11 MAX4670 Test Circuits/Timing Diagrams MAX4670 Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch Test Circuits/Timing Diagrams (continued) +3V 0.1µF V OFF-ISOLATION = 20log OUT VIN NETWORK ANALYZER 0 OR V+ IN_ NC_ V+ NO_ 50Ω VIN MAX4670 COM_ 50Ω MEAS VOUT GND V ON-LOSS = 20log OUT VIN 50Ω REF 50Ω V CROSSTALK = 20log OUT VIN 50Ω MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS. OFF-ISOLATION IS MEASURED BETWEEN COM_ AND "OFF" NO_ OR NC_ TERMINAL ON EACH SWITCH. ON-LOSS IS MEASURED BETWEEN COM_ AND "ON" NO_ OR NC_TERMINAL ON EACH SWITCH. CROSSTALK IS MEASURED FROM ONE CHANNEL TO ALL OTHER CHANNELS. SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED. Figure 5. On-Loss, Off-Isolation, and Crosstalk 0.1µF V+ V+ COM_ MAX4670 IN_ CAPACITANCE METER f = 1MHz NC_ OR NO_ VINL OR VINH GND Figure 6. Channel Off-/On-Capacitance 12 ______________________________________________________________________________________ Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch MAX4670 RECEIVE PATH PROTECTION SWITCHING CARD PROTECTION BUS LINE CARD 1 RTIP NO1 LIU RX 1:1 COM1 NC1 Rr U1 Rr RRING COM2 NC2 NO2 LINE CARD 2 RTIP COM7 NC7 NO7 1:1 Rr LIU RX U1 Rr RRING COM8 NC8 NO8 LINE CARD 3 RTIP COM7 NC7 NO7 1:1 Rr LIU RX U2 Rr RRING NC8 COM8 NO8 BACKUP LINE CARD RTIP LIU RX RRING Figure 7. Switching-Card-Architecture Receive Path ______________________________________________________________________________________ 13 MAX4670 Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch TRANSMIT PATH PROTECTION SWITCHING CARD COM3 NO3 LINE CARD 1 RT TRING PROTECTION BUS 1:1 NC3 U1 LIU TX COM4 NO4 RT TTIP NC4 COM5 NO5 LINE CARD 2 RT TRING 1:1 NC5 U1 LIU TX COM6 NO6 RT TTIP NC6 COM5 NO5 LINE CARD 3 RT TRING 1:1 NC5 U2 LIU TX NO6 RT TTIP COM6 NC6 BACKUP LINE CARD TTIP LIU TX TRING Figure 8. Switching-Card-Architecture Transmit Path 14 ______________________________________________________________________________________ Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch MAX4670 RECEIVE PATH PROTECTION BUS LINE CARD 1 MAX4670 COM1 NO1 COM2 NO2 1:1 RTIP Rr LIU RX Rr RRING LINE CARD 2 MAX4670 COM1 NO1 COM2 NO2 1:1 RTIP Rr LIU RX Rr RRING LINE CARD 3 MAX4670 COM1 NO1 COM2 NO2 1:1 RTIP Rr LIU RX Rr RRING BACKUP LINE CARD RTIP LIU RX RRING Figure 9. Adjacent-Card-Architecture Receive Path ______________________________________________________________________________________ 15 MAX4670 Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch TRANSMIT PATH PROTECTION BUS LINE CARD 1 MAX4670 COM3 NO3 COM4 NO4 RT 1:2 TTIP LIU Tx RT TRING LINE CARD 2 MAX4670 COM3 NO3 COM4 NO4 RT 1:2 TTIP LIU Tx RT TRING LINE CARD 3 MAX4670 RT TTIP COM3 NO3 COM4 NO4 1:2 LIU Tx RT TRING BACKUP LINE CARD RT RTIP LIU Tx RT RRING Figure 10. Adjacent-Card-Architecture Transmit Path 16 ______________________________________________________________________________________ Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch CHARGE-CURRENTLIMIT RESISTOR HIGHVOLTAGE DC SOURCE Cs 100pF RC 50MΩ TO 100MΩ RD 1500Ω CHARGE-CURRENTLIMIT RESISTOR DISCHARGE RESISTANCE DEVICE UNDER TEST STORAGE CAPACITOR DISCHARGE RESISTANCE STORAGE CAPACITOR DEVICE UNDER TEST I 100% 90% PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) I PEAK Ir Cs 150pF RD 330Ω Figure 13. IEC 1000-4-2 ESD Test Model Figure 11. Human Body ESD Test Model IP 100% 90% HIGHVOLTAGE DC SOURCE MAX4670 RC 1MΩ AMPERES 36.8% 10% 0 10% 0 tRL TIME tDL CURRENT WAVEFORM Figure 12. Human Body Model Current Waveform t r = 0.7ns TO 1ns t 30ns 60ns Figure 14. IED 1000-4-2 ESD Generator Current Waveform ______________________________________________________________________________________ 17 Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch MAX4670 Functional Diagram/Truth Table V+ SWITCH LOW HIGH HIGH MAX4670 RX NO1 COM1 LOW HIGH HIGH COM2 LOW HIGH HIGH NC1 RX NO2 INA NC2 0.6Ω TX NO3 COM3 0.6Ω NC3 0.6Ω TX NO4 0.6Ω LOW HIGH HIGH INA X LOW HIGH INB X LOW HIGH INC X LOW HIGH IND X LOW HIGH NC1/NC2 OFF OFF ON NC3/NC4 OFF OFF ON NC5/NC6 OFF OFF ON NC7/NC8 OFF OFF ON NO1/NO2 ON ON OFF NO3/NO4 ON ON OFF NO5/NO6 ON ON OFF NO7/NO8 ON ON OFF COM4 INB NC4 0.6Ω TX NO5 COM5 0.6Ω NC5 0.6Ω TX NO6 0.6Ω COM6 INC NC6 RX NO7 COM7 NC7 RX NO8 COM8 IND NC8 GND SWITCH Chip Information PROCESS: CMOS 18 ______________________________________________________________________________________ Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch QFN THIN.EPS ______________________________________________________________________________________ 19 MAX4670 Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) MAX4670 Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 20 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2005 2006 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.