High-Bandwidth, T1/E1, SPST Analog Switches

Transcription

1 ; Rev 2; 1/7 High-Bandwidth,, SPST Analog Switches General Description The high-bandwidth, low-on-resistance, quad-spst analog switches are designed to serve as integrated protection switches for 1+1 and N+1 line-card redundancy applications. Each replaces four electromechanical relays, significantly reducing board space, simplifying PC board routing, and reducing power consumption. These devices operate with ±3.3V or ±5V dual supplies for applications requiring signal switching in the line side of the interface transformer. Internal voltage multipliers drive the analog switches, yielding excellent linearity and low 3.7Ω typical on-resistance within the analog signal range. This high-bandwidth (55MHz typical) family of products is optimized for low return loss and matched pulse template performance in long-haul and short-haul applications. The are available in a tiny 16-pin, 5mm x 5mm, thin QFN package and are specified over the extended -4 C to +85 C temperature range. Applications Redundancy Switching Base Stations and Base-Station Controllers Add and Drop Multiplexers Multiservice Provisioning Platforms Edge Routers Multiservice Switches (MSSs) Digital Loop Carriers Industrial Applications Data Acquisition Telecom Signal Switching Test Equipment Avionics Features Quad-SPST NO, NC, and NC/NO Configurations Dual-Supply Operation from ±3.3V to ±5V Single-Supply Operation from +6V to +11V Hot Insertion Tolerant with No DC Path to the Supplies Low On-Resistance, R ON = 3.7Ω (typ) and 6Ω (max) Over 55MHz, -3dB Signal Bandwidth Excellent Crosstalk and Off-Isolation Performance Over the Signal Spectrum: 11dB Crosstalk Attenuation at 1MHz Low Current Consumption of 2mA (max) -4 C to +85 C Extended Temperature Range Space-Saving, 16-Pin, 5mm x 5mm Thin QFN TOP VIEW COM2 IN2 IN1 COM NC NC1 Pin Configurations N.C. GND NC3 *EP NC4 THIN QFN (5mm x 5mm) *EXPOSED PADDLE CONNECTED TO COM3 IN3 IN4 COM4 Pin Configurations continued at end of data sheet. Ordering Information PART TEMP RANGE PIN-PACKAGE CONFIGURATION PKG CODE ETE+ -4 C to +85 C 16 TQFN-EP* 4 x SPST NC T ETE+ -4 C to +85 C 16 TQFN-EP* 4 x SPST NO T ETE+ -4 C to +85 C 16 TQFN-EP* 4 x SPST NC/NO T *EP = Exposed paddle. Devices are available in lead-free packaging. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at , or visit Maxim s website at

2 ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND unless otherwise noted.)...-.3v to +6V...-6V to +.3V to...-.3v to +12V IN_...-.3V to ( +.3V) NO_, NC_, COM_...-12V to +12V NO_ to COM_, NC_ to COM_...-18V to +18V Continuous Current (NO_, NC_, COM_)... ±1mA Continuous Current (any other terminal)...±3ma Peak Current (NO_, NC_, COM_) (pulsed at 1ms, 1% duty cycle)...±3ma Continuous Power Dissipation (T A = +7 C) 16-Pin Thin QFN 5mm x 5mm (derate 33.3mW/ C above +7 C) mW Operating Temperature Range C to +85 C Storage Temperature Range C to +15 C Junction Temperature C Lead Temperature (soldering, 1s) C 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 Dual ±3.3V Supplies ( = +3.3V ±1%, = -3.3V ±1%, T A = T MIN to T MAX, unless otherwise noted. Typical values are at T A = +25 C.) (Note 1) ANALOG SWITCH PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Fault-Free Analog Signal Range V COM_ V NO_ V V NC_ On-Resistance (Note 2) R ON I COM_ = 3mA, = +3V, = -3V, T A = +25 C V NO_ or V NC_ = +3V T A = T MIN to T MAX 6 On-Resistance Match Between Channels (Notes 2, 3) ΔR ON = +3V, = -3V, T A = +25 C.1.6 I COM_ = 3mA, V NO_ or V NC_ = +3V T A = T MIN to T MAX.8 Ω Ω On-Resistance Flatness (Notes 2, 4) NO or NC Off-Leakage Current R FLAT(ON) I NO_(OFF) I NC_(OFF) = +3V, = -3V, I COM_ = 3mA; V NO_ or V NC_ = -3V, V, +3V = +3.6V, = -3.6V; V COM_ = -3V, +3V; V NO_ or V NC_ = +3V, -3V T A = +25 C T A = T MIN to T MAX 1.5 Ω na COM Off-Leakage Current I COM_(OFF) V COM_ = -3V, +3V; = +3.6V, = -3.6V; V NO_ or V NC_ = +3V, -3V COM On-Leakage Current I COM_(ON) V COM_ = -3V, +3V; = +3.6V, = -3.6V; NO_ or NC_ unconnected na na FAULT Fault Analog Signal Range V COM_ = +3.3V, = -3.3V V 2

3 ELECTRICAL CHARACTERISTICS Dual ±3.3V Supplies (continued) ( = +3.3V ±1%, = -3.3V ±1%, T A = T MIN to T MAX, unless otherwise noted. Typical values are at T A = +25 C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS NO or NC Off-Leakage Current I NO_ I NC_ V + = + 3.3V, V - = - 3.3V ; V N O_ or V N C _ = + 11V, - 11V ; V COM_ = -5.5V, +5.5V COM Off-Leakage Current I COM_ V + = + 3.3V, V - = - 3.3V ; V C OM _ = + 11V, - 11V ; V NO_ or V NC_ = -5.5V, +5.5V SWITCH DYNAMIC CHARACTERISTICS Crosstalk (Note 5) Off-Isolation (Note 6) V CT1 R L = 5Ω, f = 1.24MHz, Figure 4 11 V CT2 R L = 5Ω, f = 3MHz, Figure 4 77 V ISO1 V COM_ to V NO_ or V NC_, R L = 5Ω, f = 1.24MHz, Figure 4 V ISO2 V COM_ to V NO_ or V NC_, R L = 5Ω, f = 3MHz, Figure µa µa On-Channel -3dB Bandwidth BW R S = R L = 5Ω, Figure 4 55 MHz COM On-Capacitance C ON(COM_) f = 1MHz, Figure 5 1 pf COM Off-Capacitance C OFF(COM_) f = 1MHz, Figure 5 7 pf NC/NO Off-Capacitance C OFF f = 1MHz, Figure 5 7 pf Charge Injection Q C L = 1.nF, V GEN =, R GEN =, Figure 3 55 pc Fault Recovery Time t REC V NO_, V NC_, V COM_ = -11V 128 µs Turn-On Time t ON R L = 3Ω, V NO_ or V NC_ = +3V, T A = +25 C 2 4 C L = 35pF, Figure 2 T A = T MIN to T MAX 4 Turn-Off Time t OFF R L = 3Ω, V NO_ or V NC_ = +3V, T A = +25 C.5 1 C L = 35pF, Figure 2 T A = T MIN to T MAX 1 Power-Up Delay t DEL 128 µs LOGIC INPUT (IN_) Input-Voltage Low V IL.8 V Input-Voltage High V IH 2.4 V Input Leakage Current I IN V IN = or µa POWER SUPPLY Quiescent Positive Supply Current Quiescent Negative Supply Current I+ = +3.6V, = -3.6V, V IN_ = or.8 2 ma I- = +3.6V, = -3.6V, V IN_ = or.8 2 ma Negative Supply Voltage V Positive Supply Voltage V 6 3 db db µs µs 3

4 ELECTRICAL CHARACTERISTICS Dual ±5V Supplies ( = +5V ±1%, = -5V ±1%, T A = T MIN to T MAX, unless otherwise noted. Typical values are at T A = +25 C.) (Note 1) ANALOG SWITCH PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Fault-Free Analog Signal Range On-Resistance (Note 2) R ON I COM_ = 3mA, = +4.5V, = -4.5V, V NO_ or V NC_ = +3V On-Resistance Match Between Channels (Notes 2, 3) On-Resistance Flatness (Notes 2, 4) NO or NC Off-Leakage Current V COM_ V NO_ V V NC_ ΔR ON R FLAT(ON) I NO_(OFF) I NC_(OFF) = +4.5V, = -4.5V, I COM_ = 3mA, V NO_ or V NC_ = +3V = +4.5V, = -4.5V, I COM_ = 3mA; V NO_ or V NC_ = -3V, V, +3V = +5.5V, = -5.5V; V COM_ = -5V, +5V; V NO_ or V NC_ = +5V, -5V COM Off-Leakage Current I COM_(OFF) V COM_ = -5V, +5V; = +5.5V, = -5.5V; V NO_ or V NC_ = +5V, -5V COM On-Leakage Current I COM_(ON) V COM_ = -5V, +5V; = +5.5V, = -5.5V; NO_ or NO_ unconnected T A = +25 C T A = T MIN to T MAX 6 T A = +25 C.1.6 T A = T MIN to T MAX.8 T A = +25 C T A = T MIN to T MAX 1.5 Ω Ω Ω na na na FAULT Fault Analog Signal Range V COM_ V NO_ = +5V, = -5V V V NC_ NO or NC Off-Leakage Current I NO_ I NC_ = +5V, = -5V; V NO_ or V NC_ = +11V, -11V; V COM_ = -5.5V, +5.5V µa COM Off-Leakage Current I COM_ V COM_ = +11V, -11V; = +5V, = -5V; V NO_ or V NC_ = -5.5V, +5.5V µa SWITCH DYNAMIC CHARACTERISTICS V CT1 R L = 5Ω, f = 1.24MHz, Figure 4 11 Crosstalk (Note 5) V CT2 R L = 5Ω, f = 3MHz, Figure 4 77 db 4

5 ELECTRICAL CHARACTERISTICS Dual ±5V Supplies (continued) ( = +5V ±1%, = -5V ±1%, T A = T MIN to T MAX, unless otherwise noted. Typical values are at T A = +25 C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Off-Isolation (Note 6) V ISO1 V COM_ to V NO_ or V NC_, R L = 5Ω, f = 1.24MHz, Figure 4 V ISO2 V COM_ to V NO_ or V NC_, R L = 5Ω, f = 3MHz, Figure 4 On-Channel -3dB Bandwidth BW R S = R L = 5Ω, Figure 4 55 MHz COM On-Capacitance C ON(COM_) f = 1MHz, Figure 5 1 pf COM Off-Capacitance C OFF(COM_) f = 1MHz, Figure 5 7 pf NC/NO Off-Capacitance C OFF f = 1MHz, Figure 5 7 pf Charge Injection Q C L = 1.nF, V GEN =, R GEN =, Figure 3 55 pc Fault Recovery Time t REC V NO_, V NC_, V COM_ = -11V 128 µs Turn-On Time t ON R L = 3Ω, V NO_ or V NC_ = +3V, C L = 35pF, Figure 2 Turn-Off Time t OFF R L = 3Ω, V NO_ or V NC_ = +3V, C L = 35pF, Figure T A = +25 C 2 4 T A = T MIN to T MAX 4 T A = +25 C.5 1 T A = T MIN to T MAX 1 Power-Up Delay t DEL 128 µs LOGIC INPUT (IN_) Input-Voltage Low V IL.8 V Input-Voltage High V IH 2.4 V Input Leakage Current I IN V IN = or µa POWER SUPPLY Quiescent Positive Supply Current I+ = +5.5V, = -5.5V, V IN_ = or.9 2 ma db µs µs Quiescent Negative Supply Current I- = +5.5V, = -5.5V, V IN_ = or.9 2 ma Negative Supply Voltage V Positive Supply Voltage V Note 1: All parameters are production tested at T A = +85 C and guaranteed by design over specified temperature range. Note 2: Guaranteed by design, not production tested. Note 3: ΔR ON = R ON(MAX) - R ON(MIN). Note 4: Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the specified analog signal range. Note 5: Between any two switches. Note 6: Off-isolation = 2 x log 1 [V COM_ /(V NC_ or V NO_ )], V COM_ = output, V NC_ or V NO_ = input to OFF switch. 5

6 ( = +3.3V, = -3.3V, T A = +25 C, unless otherwise noted.) ON-RESISTANCE (Ω) SUPPLY CURRENT (μa) ON-RESISTANCE vs. COM_ VOLTAGE DUAL ±3.3V SUPPLIES T A = +85 C T A = +25 C T A = -4 C COM_ VOLTAGE (V) SUPPLY CURRENT vs. TEMPERATURE DUAL ±5V SUPPLIES DUAL ±3.3V SUPPLIES TEMPERATURE ( C) toc1 toc4 ON-RESISTANCE (Ω) LEAKAGE CURRENT (pa) ON-RESISTANCE vs. COM_ VOLTAGE DUAL ±5V SUPPLIES T A = +85 C T A = +25 C T A = -4 C COM_ VOLTAGE (V) NC/NO(OFF) LEAKAGE CURRENT vs. TEMPERATURE DUAL ±3.6V SUPPLIES NC_/NO_ = +3V, COM_ = -3V NC_/NO_ = -3V, COM_ = +3V TEMPERATURE ( C) Typical Operating Characteristics toc2 toc5 SUPPLY CURRENT (μa) LEAKAGE CURRENT (pa) SUPPLY CURRENT vs. SUPPLY VOLTAGE DUAL-SUPPLY VOLTAGE (V) NC/NO(OFF) LEAKAGE CURRENT vs. TEMPERATURE DUAL ±5.5V SUPPLIES NC_/NO_ = +5V, COM_ = -5V NC_/NO_ = -5V, COM_ = +5V TEMPERATURE ( C) toc3 toc6 LEAKAGE CURRENT (pa) COM(OFF) LEAKAGE CURRENT vs. TEMPERATURE DUAL ±3.6V SUPPLIES NC_/NO_ = +3V, COM_ = -3V NC_/NO_ = -3V, COM_ = +3V TEMPERATURE ( C) toc7 LEAKAGE CURRENT (pa) COM(OFF) LEAKAGE CURRENT vs. TEMPERATURE DUAL ±5.5V SUPPLIES NC_/NO_ = +5V, COM_ = -5V NC_/NO_ = -5V, COM_ = +5V TEMPERATURE ( C) toc8 LEAKAGE CURRENT (pa) COM(ON) LEAKAGE CURRENT vs. TEMPERATURE DUAL ±3.6V SUPPLIES COM_ = +3V COM_ = -3V TEMPERATURE ( C) toc9 6

7 LEAKAGE CURRENT (pa) LOSS (db) Typical Operating Characteristics (continued) ( = +3.3V, = -3.3V, T A = +25 C, unless otherwise noted.) COM(ON) LEAKAGE CURRENT vs. TEMPERATURE DUAL ±5.5V SUPPLIES COM_ = +5V COM_ = -5V TEMPERATURE ( C) FREQUENCY RESPONSE toc1 toc13 CHARGE-INJECTION (pc) LOSS (db) CHARGE INJECTION vs. COMMON VOLTAGE V COM_ (V) OFF-ISOLATION vs. FREQUENCY toc11 toc14 LOSS (db) NORMALIZED AMPLITUDE CROSSTALK vs. FREQUENCY FREQUENCY (MHz) T1 (1Ω) PULSE TEMPLATE TEST toc12 toc FREQUENCY (MHz) FREQUENCY (MHz) TIME (ns) T1 (1Ω) SCOPE SHOT OF THE INPUT AND OUTPUT OF DEVICE 2ns/div toc16 INPUT 1V/div OUTPUT 1V/div NORMALIZED AMPLITUDE E1 (12Ω) PULSE TEMPLATE TEST TIME (ns) toc17 E1 (12Ω) SCOPE SHOT OF THE INPUT AND OUTPUT OF DEVICE 1ns/div toc18 INPUT 1V/div OUTPUT 1V/div 7

8 Typical Operating Characteristics (continued) ( = +3.3V, = -3.3V, T A = +25 C, unless otherwise noted.) NORMALIZED AMPLITUDE PIN E1 (75Ω) PULSE TEMPLATE TEST TIME (ns) NAME FUNCTION 1 NC1 Analog Switch Normally Closed Terminal 1 Pin Description Negative Supply Voltage. Bypass to ground with a.1µf ceramic capacitor GND Ground 4 NC4 Analog Switch Normally Closed Terminal COM4 Analog Switch Common Terminal IN4 Switch 4 Logic-Control Input IN3 Switch 3 Logic-Control Input COM3 Analog Switch Common Terminal NC3 Analog Switch Normally Closed Terminal N.C. No Connection. Not internally connected Positive Supply Voltage. Bypass to ground with a.1µf ceramic capacitor NC2 Analog Switch Normally Closed Terminal COM2 Analog Switch Common Terminal IN2 Switch 2 Logic-Control Input IN1 Switch 1 Logic-Control Input COM1 Analog Switch Common Terminal NO1 Analog Switch Normally Open Terminal NO4 Analog Switch Normally Open Terminal 4 9 NO3 Analog Switch Normally Open Terminal 3 12 NO2 Analog Switch Normally Open Terminal 2 EP EP EP EP toc19 E1 (75Ω) SCOPE SHOT OF THE INPUT AND OUTPUT OF DEVICE 1ns/div toc2 INPUT 1V/div OUTPUT 1V/div Exposed Paddle. Connect exposed paddle to or leave unconnected. 8

9 Detailed Description The are high-bandwidth, low-on-resistance, quad-spst analog switches targeted to serve as integrated analog protection switches for 1+1 and N+1 line-card redundancy applications. These devices are designed to replace electromechanical relays to save board space, reduce power consumption, and simplify PC board routing. The devices allow the user to live insert the boards with no adverse effects. The support ±3.3V or ±5V dual-supply operation, which is required for E1/T1 signal switching in the line-side of the interface transformer. Internal voltage multipliers supply the switches yielding excellent linearity and low on-resistance, typically 3.7Ω, within the E1/T1 analog signal range. This high-bandwidth, typically 55MHz, family of devices is optimized for low return loss and matched pulse template performance in E1/T1 short-haul and long-haul applications. Analog Signal Levels The on-resistance of the is very low and stable as the analog signals are swept from to (see the Typical Operating Characteristics). Fault Protection The fault protection of the // allows the devices to handle input signals of more than twice the supply voltage without clamping the signal, latching up, or disturbing other cards in the system. The device detects when the input voltage drops below the negative supply. As soon as a fault condition is detected, the switch is immediately turned off for 128 clock cycles (typically 128µs). At the end of the 128µs timeout, the switch is turned back on for one clock cycle. At the end of the one clock cycle, if the signal is within the operating range, the switch will remain on. Otherwise, the device will turn the switch off again for 128 clock cycles. This will repeat until the signal is within the operating range. In redundancy applications, this can happen when the load resistor (R L ) is removed or disconnected for any reason, as shown in Figure 1. Without a load resistor, the output voltage when using a 1:2 transformer can be as high as ±11V. Hot Insertion The tolerate hot insertions, thus are not damaged when inserted into a live backplane. Competing devices can exhibit low impedance when plugged into a live backplane that can cause high power dissipation leading to damage of the device itself. The have relatively high input impedance when and are 5V ±1% Tx TTIP TRING Figure 1. Fault Protection 1:2 1V ±1% unconnected or connected to GND. Therefore, the devices are not destroyed by a hot insertion. In order to guarantee data integrity, the and supplies must be properly biased. Applications Information N+1 Redundancy The are designed for adjacent line-card protection applications. Figures 6 and 7 show a basic architecture for twisted-pair interface (12Ω E1, or 1Ω T1). Coaxial cable interface (75Ω E1) can be illustrated with the same figures but without the single-ended-to-differential conversion stage. A single protection card can replace up to N line cards in a N+1 redundancy scheme. Figure 6 shows the / / sitting in the line cards where they can reroute any of the input/output signals to a protection line card. Figure 7 shows the // sitting in a protection-switching card where the switches are always powered. These figures do not show the surge protection elements and resistors for line termination/impedance matching. The low on-resistance and high bandwidth of the yield good pulse template and return-loss performance (see the Typical Operating Characteristics). The pulse template tests for E1 (twisted pair interface 12Ω and coaxial interface 75Ω) and T1 (twisted pair interface 1Ω) were tested using the Dallas DS2155 single-chip transceiver evaluation board, and twelve switches in parallel with one switch closed and the other eleven open. The internal transmit termination feature must be disabled when using this circuit. To use the same transmit resistors for E1 twisted pair and coaxial cables, the transmit line build out control register (TLBC) is set to the value 6Ah. This sets the driver voltage so the output pulse has the right amplitude for both 12Ω (twisted pair) and 75Ω (coaxial) loads. The analog switches were powered with dual power supplies at ±5V. NC_ COM_ R L + Vo - 9

10 V IN_ NO_ OR NC_ IN_ COM_ GND Figure 2. Switch Turn-On/Turn-Off Times V IN_ IN_ NO_ OR NC_ COM_ GND R L 3V R GEN C L V OUT C L V IN_ 3V V V Test Circuits/Timing Diagrams t OFF 5% 3V V OUT 9% V OUT V GEN V IN_ V OUT 3V V 9% ΔV OUT t ON ΔV OUT IS THE MEASURED VOLTAGE DUE TO CHARGE- TRANSFER ERROR Q WHEN THE CHANNEL TURNS OFF. Q = ΔV OUT x C L Figure 3. Charge Injection.1μF IN_ COM_ NO_, NC_ GND 5Ω 5Ω RESISTOR ONLY NEEDED FOR CROSSTALK AND ISOLATION V OUT V IN MEAS NETWORK ANALYZER 5Ω 5Ω REF 5Ω 5Ω.1μF MEASUREMENTS ARE STANDARDIZED AGAINST SHORT AND OPEN AT SOCKET TERMINALS. OFF-ISOLATION IS MEASURED BETWEEN COM_ AND OFF NO_ OR NC_ TERMINALS. ON-RESPONSE IS MEASURED BETWEEN COM_ AND ON NO_ OR NC_ TERMINALS. CROSSTALK IS MEASURED FROM ONE CHANNEL TO ALL OTHER CHANNELS. Figure 4. On-Loss, Off-Isolation, and Crosstalk 1

11 Figure 5. Channel Off-/On-Capacitance Test Circuits/Timing Diagrams (continued) NC_ (OR NO_) IN_ COM_ GND.1μF.1μF 1MHz CAPACITANCE ANALYZER 11

12 LINE CARD 1 Tx/Rx LINE CARD 2 Tx/Rx LINE CARD N I/O 1 I/O 2 Tx/Rx I/O N PROTECTION LINE CARD Tx/Rx BACKPLANE SINGLE-ENDED-TO- DIFFERENTIAL CONVERSION Figure 6. Adjacent Line-Card Protection Architecture with Switches in the Line Cards for Twisted Pair Cable (12Ω E1, or 1Ω T1). Figure for coaxial cable (75Ω E1) is the same without the single-ended-to-differential conversion. 12

13 LINE CARD 1 Tx/Rx LINE CARD 2 Tx/Rx LINE CARD N I/O 1 I/O 2 Tx/Rx I/O N PROTECTION LINE CARD Tx/Rx PROTECTION SWITCHING CARD SINGLE-ENDED-TO- DIFFERENTIAL CONVERSION Figure 7. Adjacent Line-Card Protection Architecture with Switches out of the Line Cards for Twisted Pair Cable (12Ω E1, or 1Ω T1). Figure for coaxial cable (75Ω E1) is the same without the single-ended-to-differential conversion. 13

14 TOP VIEW COM2 IN2 IN1 COM NO NO1 N.C. GND NO3 *EP NO4 THIN QFN (5mm x 5mm) *EXPOSED PADDLE CONNECTED TO TOP VIEW COM3 IN3 IN4 COM4 COM2 IN2 IN1 COM Pin Configurations (continued) NC NO1 N.C. GND NC3 *EP NO4 THIN QFN (5mm x 5mm) *EXPOSED PADDLE CONNECTED TO PROCESS: BiCMOS CONNECT EXPOSED PADDLE TO COM3 IN3 IN4 COM4 Chip Information 14

15 .... LINE CARD N..... LINE CARD 1 LINE CARD 2 Tx Rx PROTECTION LINE CARD Rx Z L Z L Z L NO1 NO2 NO3 NO4 NO1 IN1 COM1 IN2 COM2 IN3 COM3 IN4 COM4 IN1 COM1 IN4 Typical Operating Circuit... Z L Z L... TRANSMIT RECEIVE... NO4 COM4 Rx Z L Z L = 75Ω, 1Ω, OR 12Ω 15

16 NC1 NC2 NC3 NC4 IN_ NC_ ON 1 OFF GND IN1 COM1 IN2 COM2 IN3 COM3 IN4 COM4 NO1 NO2 NO3 NO4 IN_ NO_ OFF 1 ON GND IN1 COM1 IN2 COM2 IN3 COM3 IN4 COM4 NO1 NC2 NC3 NO4 Functional Diagram IN_ NC_ ON 1 OFF GND NO_ OFF ON IN1 COM1 IN2 COM2 IN3 COM3 IN4 COM4 16

17 Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to QFN THIN.EPS Revision History Pages changed at Rev 2: 1, 9, 17 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. Maxim Integrated Products, 12 San Gabriel Drive, Sunnyvale, CA Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc. Boblet

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