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19-3798; Rev 0; 09/06
Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch
General Description
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 1.0 (max) on-resistance switches with 60pF/40pF on-/off-capacitances for interfacing to the LIU transmitter outputs. The MAX4670 also includes four 10 (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 -40C to +85C operating temperature range. o Single +3.3V Supply Voltage o Quad-DPDT/Octal-SPDT Switches Support Two T1/E1/J1 Ports o Low RON o 0.7 (typ) in Transmit Path; 5 (typ) in Receive Path o Low CON/COFF 60pF/40pF (typ) in Transmit Path 24pF/12pF (typ) in Receive Path o Chip Surge Protection IEC 61000-4-5 (8s to 20s Surge) Class 2 (1kV) o -70dB (typ) Crosstalk/Off-Isolation (3MHz) o Small, 32-Pin TQFN Package
Features
MAX4670
Ordering Information
PART* MAX4670ETJ PINPACKAGE 32 TQFN (5mm x 5mm) SURGE PROTECTION YES PKG CODE T3255-4
*This part operates at a -40C to +85C temperature range.
Applications
Optical Multiplexers (ADMs, M13s, etc.)
24 NC3 23 NO3 22 NC4 21 NO4
Pin Configuration
20 NC5 19 NO5 18 NC6 17 NO6 TOP VIEW
Edge Routers Multiservice Switches Base Station Controllers (Wireless Infrastructure Equipment) Media Gateways (VoIP)
NO2 NC2 NO1 NC1 COM1
25 26 27 28 29 30 31 32 INB 1 *EP
16 15 14 13
NC7 NO7 NC8 NO8 COM8 COM7 IND V+
MAX4670
12 11 10 9
Functional Diagram/Truth Table appears at end of data sheet.
COM2 INA V+
COM3 2
COM4 3
GND 4
INC 5
COM5 6
COM6 7
*NOTE: EXPOSED PADDLE CONNECTED TO GND
TQFN
________________________________________________________________ Maxim Integrated Products
SWITCH 8
1
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Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch MAX4670
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 8s ..................................................................21.4A Poised at 20s ................................................................11.9A Continuous Power Dissipation (TA = +70C) 32-Pin TQFN (derate 21.3mW/C above +70C) .......1702mW 38-Pin TSSOP (derate 13.7mW/C above +70C) .....1096mW Operating Temperature Range ...........................-40C to +85C Storage Temperature Range .............................-65C to +150C Junction Temperature ......................................................+150C Lead Temperature (soldering, 10s) .................................+300C
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 = +25C, unless otherwise noted.) (Notes 2, 3)
PARAMETER Rx INTERFACE On-Resistance On-Resistance Match Between Channels (Note 4) On-Resistance Flatness (Note 4) NO_ or NC_ Off-Leakage Current COM_ On-Leakage Current Tx INTERFACE On-Resistance (Note 5) On-Resistance Match Between Channels (Notes 3, 5) On-Resistance Flatness (Notes 5, 6) RON RON V+ = 3V, ICOM_ = 100mA, TA = +25C VNO_ or VNC_ = 1.5V TA = TMIN to TMAX TA = +25C V+ = 3V, ICOM_ = 100mA, VNO_ or VNC_ = 1.5V TA = TMIN to TMAX V+ = 3V; ICOM_ = 100mA; VNO_ or VNC_ = 1.0V, 1.5V, 2.0V TA = +25C TA = TMIN to TMAX 0.7 0.03 0.9 1.0 0.150 0.175 0.1 0.18 0.2 RON RON V+ = 3V, ICOM_ = 10mA, VNO_ or VNC_ = 1.5V V+ = 3V, ICOM_ = 10mA, VNO_ or VNC_ = 1.5V V+ = 3V; ICOM_ = 10mA; VNO_ or VNC_ = 1.0V, 1.5V, 2.0V TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX -1 -1 2.0 5 9 10 1.0 1.3 3.0 3.4 +1 +1 A A SYMBOL CONDITIONS MIN TYP MAX UNITS
RFLAT(ON) INO(OFF) INC (OFF) ICOM(ON)
V+ = 3.6V; VCOM_ = 0.3V, 3.3V; VNO_ or VNC_ = 3.3V, 0.3V V+ = 3.6V; VCOM_ = 0.3V, 3.3V; VNO_ or VNC_ = 3.3V, 0.3V or floating
RFLAT(ON)
2
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Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch
ELECTRICAL CHARACTERISTICS (continued)
(V+ = +2.7V to +3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C, unless otherwise noted.) (Notes 2, 3)
PARAMETER NO_ or NC_ Off-Leakage Current COM_ On-Leakage Current DYNAMIC CHARACTERISTICS VNO_ or VNC_ = 1.5V, RL = 50, CL = 35pF, Figure 2 VNO or VNC = 1.5V, RL = 50, CL = 35pF, Figure 2 TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX 80 8 20 300 300 -65 -58 dB VISO1 Tx interface VISO2 VCT1 VCT2 Crosstalk (Note 8) VCT1 VCT2 NC_ or NO_ Off-Capacitance COM_ On-Capacitance COFFRX COFFTX CCOM(ON)TX CCOM(ON)RX Tx interface, Figure 5 RL = 50, CL = 35pF, f < 3MHz RL = 50, CL = 35pF, 3MHz < f < 30MHz -78 -30 12 40 24 60 pF pF RL = 50, CL = 35pF, 3MHz < f < 30MHz RL = 50, CL = 35pF, f < 3MHz RL = 50, CL = 35pF, 3MHz < f < 30MHz -40 -65 -50 dB RL = 50, CL = 35pF, f < 3MHz -60 400 ns 750 200 ns 750 ns pC MHz SYMBOL INO(OFF), INC(OFF) ICOM(ON) CONDITIONS V+ = 3.6V; VCOM_ = 0.3V, 3.3V; VNO_ or VNC_ = 0.3V, 3.3V V+ = 3.6V; VCOM_ = 0.3V, 3.3V; VNO_ or VNC_ = 0.3V, 3.3V or floating MIN -1 -1 TYP MAX +1 +1 UNITS A A
MAX4670
Turn-On Time
tON
Turn-Off Time Break-Before-Make Delay Charge Injection On-Channel 3dB Bandwidth
tOFF tD Q BW VISO1
RL = 50, CL = 35pF, Figure 3 VGEN = 1.5V, RGEN = 0, CL = 1nF, Figure 4 Rx interface Tx interface Rx interface Tx interface RL = 50, CL = 35pF, f < 3MHz Rx interface RL = 50, CL = 35pF, 3MHz < f < 30MHz
VISO2 Off-Isolation (Note 7)
Rx interface, Figure 5
Rx interface f = 1MHz, Figure 6 Tx interface f = 1MHz, Figure 6 f = 1MHz Rx interface Tx interface
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Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch MAX4670
ELECTRICAL CHARACTERISTICS (continued)
(V+ = +2.7V to +3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C, unless otherwise noted.) (Notes 2, 3)
PARAMETER DIGITAL I/O (IN_, SWITCH ) Input-Low Voltage Input-High Voltage Input Leakage Current SUPPLY Operating Voltage Range Supply Current V+ I+ V+ = 3.6V, VIN_ = V SWIT C H = 0 or V+ 2.7 3.6 10 V A VIL VIH IIL V+ = 2.7V V+ = 3.6V VIN_ = 0 or V+, V SWIT C H = 0 or V+ 1.4 -1 +1 0.5 V V A SYMBOL CONDITIONS MIN TYP MAX UNITS
Note 2: Note 3: Note 4: Note 5: Note 6:
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.
Typical Operating Characteristics
(V+ = 3.0V, TA = +25C, unless otherwise noted.)
ON-RESISTANCE vs. COM_VOLTAGE (Tx INTERFACE)
MAX4670 toc01
ON-RESISTANCE vs. COM_ VOLTAGE OVER TEMPERATURE (Tx INTERFACE)
MAX4670 toc02
ON-RESISTANCE vs. COM_VOLTAGE (Rx INTERFACE)
MAX4670 toc03
0.9
1.2 1.0 ON-RESISTANCE () TA = +85C 0.8 0.6 0.4 TA = -40C 0.2 TA = +25C
10 9 ON-RESISTANCE () 8 7 6 5 4 3 V+ = 3.6V 0 0.6 1.2 V+ = 3V 1.8 VCOM_ (V) 2.4 3.0 V+ = 2.7V
ON-RESISTANCE ()
0.8
0.7
V+ = 2.7V V+ = 3V
0.6 V+ = 3.6V 0.5 0 0.6 1.2 1.8 VCOM_ (V) 2.4 3.0 3.6 0 0
0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 VCOM_ (V)
3.6
4
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Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch
Typical Operating Characteristics (continued)
(V+ = 3.0V, TA = +25C, unless otherwise noted.)
ON-RESISTANCE vs. COM_ VOLTAGE OVER TEMPERATURE (Rx INTERFACE)
MAX4670 toc04
MAX4670
COM_ LEAKAGE CURRENT vs. TEMPERATURE (Tx INTERFACE)
MAX4670toc05
12 10 ON-RESISTANCE () 8 6 4 TA = -40C 2 0 0 TA = +85C
10
LEAKAGE CURRENT (nA)
TA = +25C
1
0.1
0.01 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 VCOM_ (V) -40 -15 10 35 60 85 TEMPERATURE (C)
NC_/NO_ LEAKAGE CURRENT vs. TEMPERATURE (Tx INTERFACE)
MAX4670toc06
COM_ LEAKAGE CURRENT vs. TEMPERATURE (Rx INTERFACE)
MAX4670 toc07
10
10
LEAKAGE CURRENT (nA)
1
LEAKAGE CURRENT (nA) 85
1
NC_ 0.1 NO_
0.1
0.01 -40 -15 10 35 60 TEMPERATURE (C)
0.01 -40 -15 10 35 60 85 TEMPERATURE (C)
NC_/NO_ LEAKAGE CURRENT vs. TEMPERATURE (Rx INTERFACE)
MAX4670 toc08
TURN-ON TIME vs. SUPPLY VOLTAGE (Tx INTERFACE)
280 250 220 190 160 130
MAX4670 toc09
10
LEAKAGE CURRENT (nA)
1 NC_ 0.1 NO_
TURN-ON TIME (ns) 60 85
0.01 -40 -15 10 35 TEMPERATURE (C)
100 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 SUPPLY VOLTAGE (V)
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Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch MAX4670
Typical Operating Characteristics (continued)
(V+ = 3.0V, TA = +25C, unless otherwise noted.)
TURN-OFF TIME vs. SUPPLY VOLTAGE (Tx INTERFACE)
MAX4670 toc10
TURN-ON/OFF TIMES vs. SUPPLY VOLTAGE (Rx INTERFACE)
MAX4670 toc11
TURN-ON TIME vs. TEMPERATURE (Tx INTERFACE)
400 375 350 325 TURN-ON TIME (ns) 300 275 250 225 200 175 150 125 100 -40 -15 10 35 60 85 TEMPERATURE (C) V+ = 3V
MAX4670 toc12
60 50 TURN-OFF TIME (ns) 40 30 20 10 0
95 90 TURN-ON/OFF TIMES (ns) tON 85 80 75 70 65 60 tOFF
2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 SUPPLY VOLTAGE (V)
2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 SUPPLY VOLTAGE (V)
3.6
TURN-OFF TIME vs. TEMPERATURE (Tx INTERFACE)
MAX4670 toc13
TURN-ON/OFF TIMES vs. TEMPERATURE (Rx INTERFACE)
MAX4670 toc14
CHARGE INJECTION vs. COM_ VOLTAGE (Tx INTERFACE)
MAX4670 toc15
40 38 36 TURN-OFF TIME (ns) 34 32 30 28 26 24 22 20 -40 -15 10 35 60 V+ = 3V
60 tON 50 TURN-ON/OFF TIMES (ns) 40 30 20 10 0 tOFF
150
CHARGE INJECTION (pC) 35 60 85
120
90
60
30 0 -40 -15 10 0 0.5 1.0 1.5 VCOM (V) 2.0 2.5 3.0 TEMPERATURE (C)
85
TEMPERATURE (C)
CHARGE INJECTION vs. COM_ VOLTAGE (Rx INTERFACE)
MAX4670 toc16
FREQUENCY RESPONSE (Tx INTERFACE)
MAX4670 toc17
FREQUENCY RESPONSE (Rx INTERFACE)
0 ON LOSS -20 ON LOSS (dB) -40 CROSSTALK -60 -80 -100 -120 OFF-ISOLATION
MAX4670 toc18
12 10 CHARGE INJECTION (pC) 8 6 4
20 ON LOSS 0 -20 ON LOSS (dB) -40 -60 -80 -100 CROSSTALK OFF-ISOLATION
20
2 0 0 0.5 1.0 1.5 VCOM_ (V) 2.0 2.5 3.0
-120 -140 0.1 1 10 100 FREQUENCY (MHz) 1000
-140 0.1 1 10 100 FREQUENCY (MHz) 1000
6
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Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch
Pin Description
PIN -- 1 2 3 4 5 6 7 NAME N.C. INB COM3 COM4 GND INC COM5 COM6 No Connection. Not internally connected. Transmitter 1 Logic Control. Drive INB high to connect NC3 and NC4. INB logic is ignored when SWITCH asserts low. Common Terminal 3. Transmitter 1 positive differential terminal. Connect COM3 to the transmit interface transformer. Common Terminal 4. Transmitter 1 negative differential terminal. Connect COM4 to the transmit interface transformer. Ground Transmitter 2 Logic Control. Drive INC high to connect NC5 and NC6. INC logic is ignored when SWITCH asserts low. Common Terminal 5. Transmitter 2 positive differential terminal. Connect COM5 to the transmit interface transformer. Common Terminal 6. Transmitter 2 negative differential terminal. Connect COM6 to the transmit interface transformer. 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. Positive Supply Voltage. Bypass V+ to ground with a 0.1F ceramic capacitor. Receiver 2 Logic Control. Drive IND high to connect NC7 and NC8. IND logic is ignored when SWITCH asserts low. Common Terminal 7. Receiver 2 positive differential terminal. Connect COM7 to the receive interface transformer. Common Terminal 8. Receiver 2 negative differential terminal. Connect COM8 to the receive interface transformer. Normally Open Terminal 8. Receiver 2 differential protection terminal. Connect NO8 to the protection bus. Normally Closed Terminal 8. Receiver 2 differential terminal. Connect NC8 to LIU receiver. Normally Open Terminal 7. Receiver 2 differential protection terminal. Connect NO7 to the protection bus. Normally Closed Terminal 7. Receiver 2 differential terminal. Connect NC7 to LIU receiver. Normally Open Terminal 6. Transmitter 2 differential protection terminal. Connect NO6 to the protection bus. Normally Closed Terminal 6. Transmitter 2 differential terminal. Connect NC6 to LIU receiver. Normally Open Terminal 5. Transmitter 2 differential protection terminal. Connect NO5 to the protection bus. Normally Closed Terminal 5. Transmitter 2 differential terminal. Connect NC5 to LIU receiver. Normally Open Terminal 4. Transmitter 1 differential protection terminal. Connect NO4 to the protection bus. FUNCTION
MAX4670
8 9, 32 10 11 12 13 14 15 16 17 18 19 20 21
SWITCH V+ IND COM7 COM8 NO8 NC8 NO7 NC7 NO6 NC6 NO5 NC5 NO4
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Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch MAX4670
Pin Description (continued)
PIN 22 23 24 25 26 27 28 29 30 31 EP NAME NC4 NO3 NC3 NO2 NC2 NO1 NC1 COM1 COM2 INA EP FUNCTION Normally Closed Terminal 4. Transmitter 1 differential terminal. Connect NC4 to LIU receiver. Normally Open Terminal 3. Transmitter 1 differential protection terminal. Connect NO3 to the protection bus. Normally Closed Terminal 3. Transmitter 1 differential terminal. Connect NC3 to LIU receiver. Normally Open Terminal 2. Receiver 2 differential protection terminal. Connect NO2 to the protection bus. Normally Closed Terminal 2. Receiver 1 differential terminal. Connect NC2 to LIU receiver. Normally Open Terminal 1. Receiver 1 differential protection terminal. Connect NO1 to the protection bus. Normally Closed Terminal 1. Receiver 1 differential terminal. Connect NC1 to LIU receiver. Common Terminal 1. Receiver 1 positive differential terminal. Connect COM1 to the receive interface transformer. Common Terminal 2. Receiver 1 negative differential terminal. Connect COM2 to the receive interface transformer. Receiver 1 Logic Control. Drive INA low to connect receiver 1 to the LIU. INA logic is ignored when SWITCH asserts low. 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 0.7 on-resistance switches with 60pF and 40pF on- and off-capacitances, respectively, for interfacing to the LIU transmitter inputs. The MAX4670 also includes four 5 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.
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.
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
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Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch MAX4670
V+ SWITCH LOW HIGH HIGH RX COM1 LOW HIGH HIGH LOW HIGH HIGH 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
MAX4670
NO1 NC1 NO2 NC2 0.6 NO3 0.6 NC3 0.6 NO4 0.6 NC4 0.6 NO5 0.6 NC5 0.6 NO6 0.6 NC6 NO7 NC7 NO8 NC8
RX
COM2 INA
TX
COM3
TX
COM4 INB
TX
COM5
TX
COM6 INC
RX
COM7
RX
COM8 IND
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.
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Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch MAX4670
Table 1. MAX4670 Truth Table
SWITCH LOW HIGH HIGH -- LOW HIGH HIGH -- LOW HIGH HIGH -- 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/NC6 ON ON OFF NO7/NO8 ON ON OFF
The receive interface series resistance is small enough to support LIUs with internal line termination, provided the external 120 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.
Human Body Model
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 1.5k resistor.
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.
Table 2. IEC 61000-4-5 Test Conditions
TEST CONFIGURATION Differential Surge (Line to Line) Common-Mode Surge (Line to GND) TEST CONDITIONS 500V peak, 12A min current, 8s/20s surge 1000V peak, 24A min current, 8s/20s surge
LIU Interface Recommendations
The MAX4670 low 0.7 (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 = 9.1, the actual value in the application should be: Rt = Rt - RON = 9.1 - 0.7 = 8.4
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.
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Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch
Test Circuits/Timing Diagrams
V+ 0.1F LOGIC INPUT VOUT RL 50 IN_ LOGIC INPUT GND SWITCH OUTPUT 0V t ON CL 35pF VOUT 0.9 x V0UT t OFF 0.9 x VOUT VINH 50% VINL t r < 5ns t f < 5ns
MAX4670
MAX4670
V+ V NO_ OR V NC_ NO_ OR NC_ COM_
VOUT = VN_
CL INCLUDES FIXTURE AND STRAY CAPACITANCE. RL RL + RON
(
)
LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES THAT HAVE THE OPPOSITE LOGIC SENSE.
WHERE, VN_ IS VNC_ OR VNO_.
Figure 2. Switching Time
V+
0.1F LOGIC INPUT COM_ VOUT RL 50 CL 35pF 0.9 x VOUT tD VINH 50% VINL
MAX4670
V+ VNO_ OR VNC_ NC_ NO_ IN_ LOGIC INPUT GND VOUT
CL INCLUDES FIXTURE AND STRAY CAPACITANCE.
Figure 3. Break-Before-Make Intervals
V+
0.1F VOUT IN_ OFF ON
MAX4670
V+ RGEN NC_ OR NO_ GND IN_ IN_ VINL TO VINH OFF ON Q = (V OUT )(C L ) COM_ CL VOUT
VOUT
OFF
V GEN
OFF
IN DEPENDS ON SWITCH CONFIGURATION; INPUT POLARITY DETERMINED BY SENSE OF SWITCH.
Figure 4. Charge Injection ______________________________________________________________________________________ 11
Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch MAX4670
Test Circuits/Timing Diagrams (continued)
+3V 0.1F NETWORK ANALYZER 0 OR V+ IN_ V+ NO_ VIN 50 50 V OFF-ISOLATION = 20log OUT VIN V ON-LOSS = 20log OUT VIN V CROSSTALK = 20log OUT VIN
NC_ 50
MAX4670
COM_ GND VOUT
MEAS
REF
50
50
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
0.1F V+
V+ COM_
MAX4670
IN_ VINL OR VINH
CAPACITANCE METER f = 1MHz
NC_ OR NO_ 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 LINE CARD 1 RTIP NC1 NO1 LIU RX U1 Rr RRING NC2 NO2 COM2 COM1 Rr 1:1
PROTECTION BUS
LINE CARD 2 RTIP NC7 NO7 LIU RX U1 Rr RRING NC8 NO8 COM8 COM7 Rr 1:1
LINE CARD 3 RTIP NC7 NO7 LIU RX U2 Rr RRING NC8 NO8 COM8 COM7 Rr 1:1
BACKUP LINE CARD RTIP
LIU RX
RRING
Figure 7. Switching-Card-Architecture Receive Path ______________________________________________________________________________________ 13
Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch MAX4670
TRANSMIT PATH PROTECTION SWITCHING CARD NO3 RT TRING NC3 U1 LIU TX NO4 RT TTIP NC4 COM4 COM3 1:1 PROTECTION BUS
LINE CARD 1
LINE CARD 2 RT TRING
NO5 NC5 U1 NO6 RT
COM5
1:1
LIU TX
COM6
TTIP
NC6
LINE CARD 3 RT TRING
NO5 NC5 U2 NO6 RT
COM5
1:1
LIU TX
COM6
TTIP
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 COM2 NO1 NO2 1:1 Rr LIU RX Rr RRING
RTIP
LINE CARD 2
MAX4670
COM1 COM2 NO1 NO2 1:1 Rr LIU RX Rr RRING
RTIP
LINE CARD 3
MAX4670
COM1 COM2 NO1 NO2 1:1 Rr LIU RX Rr RRING
RTIP
BACKUP LINE CARD RTIP
LIU RX
RRING
Figure 9. Adjacent-Card-Architecture Receive Path ______________________________________________________________________________________ 15
Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch MAX4670
TRANSMIT PATH
LINE CARD 1 PROTECTION BUS
MAX4670
COM3 COM4 RT TTIP NO3 NO4 1:2
LIU Tx RT TRING
LINE CARD 2
MAX4670
COM3 COM4 RT TTIP NO3 NO4 1:2
LIU Tx RT TRING
LINE CARD 3
MAX4670
COM3 COM4 RT TTIP NO3 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 MAX4670
RC 1M CHARGE-CURRENTLIMIT RESISTOR HIGHVOLTAGE DC SOURCE RD 1500 DISCHARGE RESISTANCE DEVICE UNDER TEST HIGHVOLTAGE DC SOURCE RC 50M TO 100M CHARGE-CURRENTLIMIT RESISTOR RD 330 DISCHARGE RESISTANCE DEVICE UNDER TEST
Cs 100pF
STORAGE CAPACITOR
Cs 150pF
STORAGE CAPACITOR
Figure 11. Human Body ESD Test Model
Figure 13. IEC 1000-4-2 ESD Test Model
IP 100% 90% AMPERES 36.8% 10% 0 0 tRL TIME
Ir
PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) I PEAK
I 100% 90%
10% tDL CURRENT WAVEFORM t r = 0.7ns TO 1ns 30ns 60ns t
Figure 12. Human Body Model Current Waveform
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+
MAX4670
RX
SWITCH LOW HIGH HIGH COM1 LOW HIGH HIGH LOW HIGH HIGH LOW HIGH HIGH
NO1 NC1 NO2 NC2 0.6 NO3 0.6 NC3 0.6 NO4 0.6 NC4 0.6 NO5 0.6 NC5 0.6 NO6 0.6 NC6 NO7 NC7 NO8 NC8
RX
COM2 INA
TX
COM3
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
TX
COM4 INB
TX
COM5
TX
COM6 INC
RX
COM7
RX
COM8 IND
GND
SWITCH
Chip Information
PROCESS: CMOS
18
______________________________________________________________________________________
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.)
MAX4670
______________________________________________________________________________________
QFN THIN.EPS
19
Integrated T1/E1/J1 Short-Haul and Long-Haul Protection Switch 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.)
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 (c) 2006 Maxim Integrated Products 2005 is a registered trademark of Maxim Integrated Products, Inc.

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