19-3951; Rev 2; 1/07 High-Bandwidth, T1/E1, SPST Analog Switches The MAX4815/MAX4816/MAX4817 high-bandwidth, low-on-resistance, quad-SPST analog switches are designed to serve as integrated T1/E1 protection switches for 1+1 and N+1 line-card redundancy applications. Each MAX4815/MAX4816/MAX4817 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 T1/E1 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 T1/E1 analog signal range. This high-bandwidth (550MHz typical) family of products is optimized for low return loss and matched pulse template performance in T1/E1 long-haul and short-haul applications. The MAX4815/MAX4816/MAX4817 are available in a tiny 16-pin, 5mm x 5mm, thin QFN package and are specified over the extended -40°C to +85°C temperature range. 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, RON = 3.7Ω (typ) and 6Ω (max) ♦ Over 550MHz, -3dB Signal Bandwidth ♦ Excellent Crosstalk and Off-Isolation Performance Over the T1/E1 Signal Spectrum: 110dB Crosstalk Attenuation at 1MHz ♦ Low Current Consumption of 2mA (max) ♦ -40°C to +85°C Extended Temperature Range ♦ Space-Saving, 16-Pin, 5mm x 5mm Thin QFN Pin Configurations N.C. NC3 TOP VIEW Base Stations and Base-Station Controllers V+ T1/E1 Redundancy Switching NC2 Applications 12 11 10 9 Add and Drop Multiplexers Multiservice Provisioning Platforms Edge Routers COM2 13 IN2 14 8 COM3 7 IN3 6 IN4 5 COM4 MAX4815 Multiservice Switches (MSSs) IN1 Digital Loop Carriers COM1 15 16 + *EP 3 4 NC4 NC1 Telecom Signal Switching 2 GND 1 Data Acquisition V- Industrial Applications THIN QFN (5mm x 5mm) *EXPOSED PADDLE CONNECTED TO V- Test Equipment Avionics Pin Configurations continued at end of data sheet. Ordering Information TEMP RANGE PIN-PACKAGE MAX4815ETE+ PART -40°C to +85°C 16 TQFN-EP* CONFIGURATION PKG CODE 4 x SPST NC T1655-3 MAX4816ETE+ -40°C to +85°C 16 TQFN-EP* 4 x SPST NO T1655-3 MAX4817ETE+ -40°C to +85°C 16 TQFN-EP* 4 x SPST NC/NO T1655-3 *EP = Exposed paddle. Devices are available in lead-free packaging. ________________________________________________________________ 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 MAX4815/MAX4816/MAX4817 General Description MAX4815/MAX4816/MAX4817 High-Bandwidth, T1/E1, SPST Analog Switches ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND unless otherwise noted.) V+ ............................................................................-0.3V to +6V V- .............................................................................-6V to +0.3V V+ to V-...................................................................-0.3V to +12V IN_ ................................................................-0.3V to (V+ + 0.3V) NO_, NC_, COM_ ....................................................-12V to +12V NO_ to COM_, NC_ to COM_ ..................................-18V to +18V Continuous Current (NO_, NC_, COM_) ....................... ±100mA Continuous Current (any other terminal) ..........................±30mA Peak Current (NO_, NC_, COM_) (pulsed at 1ms, 10% duty cycle).................................±300mA Continuous Power Dissipation (TA = +70°C) 16-Pin Thin QFN 5mm x 5mm (derate 33.3mW/°C above +70°C) .............................................................2667mW 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 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 (V+ = +3.3V ±10%, V- = -3.3V ±10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS V+ V ANALOG SWITCH Fault-Free Analog Signal Range On-Resistance (Note 2) On-Resistance Match Between Channels (Notes 2, 3) VCOM_ VNO_ VNC_ RON ΔRON On-Resistance Flatness (Notes 2, 4) RFLAT(ON) NO or NC Off-Leakage Current INO_(OFF) INC_(OFF) V- V+ = +3V, V- = -3V, ICOM_ = 30mA, VNO_ or VNC_ = +3V V+ = +3V, V- = -3V, ICOM_ = 30mA, VNO_ or VNC_ = +3V V+ = +3V, V- = -3V, ICOM_ = 30mA; VNO_ or VNC_ = -3V, 0V, +3V TA = +25°C 3.7 5 Ω TA = TMIN to TMAX 6 TA = +25°C 0.1 0.6 Ω TA = TMIN to TMAX 0.8 TA = +25°C 0.4 1.2 Ω TA = TMIN to TMAX 1.5 V+ = +3.6V, V- = -3.6V; VCOM_ = -3V, +3V; VNO_ or VNC_ = +3V, -3V -10 +10 nA COM Off-Leakage Current V+ = +3.6V, V- = -3.6V; ICOM_(OFF) VCOM_ = -3V, +3V; VNO_ or VNC_ = +3V, -3V -10 +10 nA COM On-Leakage Current ICOM_(ON) V+ = +3.6V, V- = -3.6V; VCOM_ = -3V, +3V; NO_ or NC_ unconnected -15 +15 nA V+ = +3.3V, V- = -3.3V -11 +11 V FAULT Fault Analog Signal Range 2 VCOM_ _______________________________________________________________________________________ High-Bandwidth, T1/E1, SPST Analog Switches MAX4815/MAX4816/MAX4817 ELECTRICAL CHARACTERISTICS—Dual ±3.3V Supplies (continued) (V+ = +3.3V ±10%, V- = -3.3V ±10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER NO or NC Off-Leakage Current COM Off-Leakage Current SYMBOL INO_ INC_ ICOM_ CONDITIONS MIN TYP MAX UNITS V+ = +3.3V, V- = -3.3V; VNO_ or VNC_ = +11V, -11V; VCOM_ = -5.5V, +5.5V -1 +1 µA V+ = +3.3V, V- = -3.3V; VCOM_ = +11V, -11V; VNO_ or VNC_ = -5.5V, +5.5V -1 +1 µA SWITCH DYNAMIC CHARACTERISTICS Crosstalk (Note 5) VCT1 RL = 50Ω, f = 1.024MHz, Figure 4 110 VCT2 RL = 50Ω, f = 30MHz, Figure 4 77 VISO1 VCOM_ to VNO_ or VNC_, RL = 50Ω, f = 1.024MHz, Figure 4 60 VISO2 VCOM_ to VNO_ or VNC_, RL = 50Ω, f = 30MHz, Figure 4 30 RS = RL = 50Ω, Figure 4 Off-Isolation (Note 6) On-Channel -3dB Bandwidth dB 550 MHz COM On-Capacitance CON(COM_) f = 1MHz, Figure 5 10 pF COM Off-Capacitance COFF(COM_) f = 1MHz, Figure 5 7 pF NC/NO Off-Capacitance Charge Injection BW dB COFF Q f = 1MHz, Figure 5 7 pF CL = 1.0nF, VGEN = 0, RGEN = 0, Figure 3 55 pC µs Fault Recovery Time tREC VNO_, VNC_, VCOM_ = -11V 128 tON VNO_ or VNC_ = +3V, RL = 300Ω, CL = 35pF, Figure 2 20 Turn-On Time Turn-Off Time tOFF Power-Up Delay VNO_ or VNC_ = +3V, RL = 300Ω, CL = 35pF, Figure 2 TA = +25°C 40 µs TA = TMIN to TMAX 40 TA = +25°C 0.5 1 µs TA = TMIN to TMAX 1 tDEL 128 µs LOGIC INPUT (IN_) Input-Voltage Low VIL Input-Voltage High VIH 0.8 Input Leakage Current IIN VIN = 0 or V+ Quiescent Positive Supply Current I+ V+ = +3.6V, V- = -3.6V, VIN_ = 0 or V+ Quiescent Negative Supply Current I- V+ = +3.6V, V- = -3.6V, VIN_ = 0 or V+ Negative Supply Voltage V- Positive Supply Voltage V+ 2.4 V V -1 +1 µA 0.8 2 mA 0.8 2 mA -3.6 -3.0 V 3.0 3.6 V POWER SUPPLY _______________________________________________________________________________________ 3 MAX4815/MAX4816/MAX4817 High-Bandwidth, T1/E1, SPST Analog Switches ELECTRICAL CHARACTERISTICS—Dual ±5V Supplies (V+ = +5V ±10%, V- = -5V ±10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS V+ V ANALOG SWITCH Fault-Free Analog Signal Range VCOM_ VNO_ VNC_ VTA = +25°C RON V+ = +4.5V, V- = -4.5V, ICOM_ = 30mA, VNO_ or VNC_ = +3V TA = TMIN to TMAX ΔRON V+ = +4.5V, V- = -4.5V, ICOM_ = 30mA, VNO_ or VNC_ = +3V TA = TMIN to TMAX On-Resistance Flatness (Notes 2, 4) RFLAT(ON) V+ = +4.5V, V- = -4.5V, ICOM_ = 30mA; VNO_ or VNC_ = -3V, 0V, +3V NO or NC Off-Leakage Current INO_(OFF) INC_(OFF) On-Resistance (Note 2) On-Resistance Match Between Channels (Notes 2, 3) 3.7 5 6 TA = +25°C 0.1 0.6 0.8 TA = +25°C 0.4 Ω Ω 1.2 Ω TA = TMIN to TMAX 1.5 V+ = +5.5V, V- = -5.5V; VCOM_ = -5V, +5V; VNO_ or VNC_ = +5V, -5V -10 +10 nA COM Off-Leakage Current V+ = +5.5V, V- = -5.5V; ICOM_(OFF) VCOM_ = -5V, +5V; VNO_ or VNC_ = +5V, -5V -10 +10 nA COM On-Leakage Current ICOM_(ON) V+ = +5.5V, V- = -5.5V; VCOM_ = -5V, +5V; NO_ or NO_ unconnected -15 +15 nA V+ = +5V, V- = -5V -11 +11 V INO_ INC_ V+ = +5V, V- = -5V; VNO_ or VNC_ = +11V, -11V; VCOM_ = -5.5V, +5.5V -1 +1 µA ICOM_ V+ = +5V, V- = -5V; VCOM_ = +11V, -11V; VNO_ or VNC_ = -5.5V, +5.5V -1 +1 µA FAULT Fault Analog Signal Range NO or NC Off-Leakage Current COM Off-Leakage Current VCOM_ VNO_ VNC_ SWITCH DYNAMIC CHARACTERISTICS Crosstalk (Note 5) 4 VCT1 RL = 50Ω, f = 1.024MHz, Figure 4 110 VCT2 RL = 50Ω, f = 30MHz, Figure 4 77 _______________________________________________________________________________________ dB High-Bandwidth, T1/E1, SPST Analog Switches (V+ = +5V ±10%, V- = -5V ±10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS VCOM_ to VNO_ or VNC_, RL = 50Ω, f = 1.024MHz, Figure 4 60 VISO2 VCOM_ to VNO_ or VNC_, RL = 50Ω, f = 30MHz, Figure 4 30 On-Channel -3dB Bandwidth COM On-Capacitance BW RS = RL = 50Ω, Figure 4 CON(COM_) f = 1MHz, Figure 5 COM Off-Capacitance COFF(COM_) f = 1MHz, Figure 5 Charge Injection COFF Q Fault Recovery Time TYP VISO1 Off-Isolation (Note 6) NC/NO Off-Capacitance MIN tREC MAX UNITS dB 550 10 MHz pF 7 pF 7 pF CL = 1.0nF, VGEN = 0, RGEN = 0, Figure 3 55 pC VNO_, VNC_, VCOM_ = -11V 128 f = 1MHz, Figure 5 TA = +25°C Turn-On Time tON VNO_ or VNC_ = +3V, RL = 300Ω, CL = 35pF, Figure 2 TA = TMIN to TMAX Turn-Off Time tOFF VNO_ or VNC_ = +3V, RL = 300Ω, CL = 35pF, Figure 2 TA = TMIN to TMAX Power-Up Delay tDEL 20 µs 40 40 TA = +25°C 0.5 µs 1 1 128 µs µs LOGIC INPUT (IN_) Input-Voltage Low VIL Input-Voltage High VIH Input Leakage Current IIN VIN = 0 or V+ Quiescent Positive Supply Current I+ V+ = +5.5V, V- = -5.5V, VIN_ = 0 or V+ Quiescent Negative Supply Current I- V+ = +5.5V, V- = -5.5V, VIN_ = 0 or V+ 0.8 V +1 µA 0.9 2 mA 0.9 2 mA 2.4 V -1 POWER SUPPLY Negative Supply Voltage V- -5.5 -4.5 V Positive Supply Voltage V+ 4.5 5.5 V All parameters are production tested at TA = +85°C and guaranteed by design over specified temperature range. Guaranteed by design, not production tested. ΔRON = RON(MAX) - RON(MIN). 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 = 20 x log10 [VCOM_/(VNC_ or VNO_)], VCOM_ = output, VNC_ or VNO_ = input to OFF switch. Note 1: Note 2: Note 3: Note 4: _______________________________________________________________________________________ 5 MAX4815/MAX4816/MAX4817 ELECTRICAL CHARACTERISTICS—Dual ±5V Supplies (continued) Typical Operating Characteristics (V+ = +3.3V, V- = -3.3V, TA = +25°C, unless otherwise noted.) ON-RESISTANCE vs. COM_ VOLTAGE TA = +85°C TA = +25°C 3 TA = -40°C 2 SUPPLY CURRENT (μA) 4 DUAL ±5V SUPPLIES 5 ON-RESISTANCE (Ω) ON-RESISTANCE (Ω) TA = +85°C SUPPLY CURRENT vs. SUPPLY VOLTAGE 4 TA = +25°C 3 1000 TA = -40°C 2 MAX4815 toc03 DUAL ±3.3V SUPPLIES 5 6 MAX4815 toc01 6 MAX4815 toc02 ON-RESISTANCE vs. COM_ VOLTAGE 900 800 700 1 0 0 -2.2 -1.1 0 1.1 2.2 700 -15 10 35 60 35 5.0 60 520 480 440 400 360 320 280 240 200 160 120 80 40 0 -40 85 DUAL ±5.5V SUPPLIES NC_/NO_ = -5V, COM_ = +5V -40 -15 10 35 60 COM(OFF) LEAKAGE CURRENT vs. TEMPERATURE COM(OFF) LEAKAGE CURRENT vs. TEMPERATURE COM(ON) LEAKAGE CURRENT vs. TEMPERATURE 200 NC_/NO_ = +3V, COM_ = -3V 120 NC_/NO_ = -3V, COM_ = +3V 40 240 200 160 NC_/NO_ = +5V, COM_ = -5V 120 80 540 NC_/NO_ = -5V, COM_ = +5V 40 420 360 300 240 120 0 0 -40 -60 10 35 60 85 COM_ = -3V 60 -40 TEMPERATURE (°C) COM_ = +3V 180 0 -15 DUAL ±3.6V SUPPLIES 480 LEAKAGE CURRENT (pA) 280 LEAKAGE CURRENT (pA) 240 DUAL ±5.5V SUPPLIES 85 MAX4815 toc09 MAX4815 toc07 360 320 5.5 NC_/NO_ = +5V, COM_ = -5V TEMPERATURE (°C) DUAL ±3.6V SUPPLIES -40 4.5 TEMPERATURE (°C) 280 6 NC_/NO_ = -3V, COM_ = +3V 10 4.0 NC/NO(OFF) LEAKAGE CURRENT vs. TEMPERATURE NC_/NO_ = +3V, COM_ = -3V -15 3.5 DUAL-SUPPLY VOLTAGE (V) DUAL ±3.6V SUPPLIES -40 85 3.0 TEMPERATURE (°C) 360 80 520 480 440 400 360 320 280 240 200 160 120 80 40 0 -40 5 LEAKAGE CURRENT (pA) LEAKAGE CURRENT (pA) 750 160 3 MAX4815 toc05 MAX4815 toc04 800 320 1 NC/NO(OFF) LEAKAGE CURRENT vs. TEMPERATURE DUAL ±3.3V SUPPLIES -40 -1 SUPPLY CURRENT vs. TEMPERATURE DUAL ±5V SUPPLIES 850 -3 COM_ VOLTAGE (V) 950 900 600 -5 COM_ VOLTAGE (V) 1000 SUPPLY CURRENT (μA) 3.3 MAX4815 toc08 -3.3 MAX4815 toc06 1 LEAKAGE CURRENT (pA) MAX4815/MAX4816/MAX4817 High-Bandwidth, T1/E1, SPST Analog Switches -40 -15 10 35 TEMPERATURE (°C) 60 85 -40 -15 10 35 TEMPERATURE (°C) _______________________________________________________________________________________ 60 85 High-Bandwidth, T1/E1, SPST Analog Switches CHARGE INJECTION vs. COMMON VOLTAGE 300 COM_ = +5V 180 120 COM_ = -5V 60 -60 100 LOSS (dB) 360 240 120 CHARGE-INJECTION (pC) LEAKAGE CURRENT (pA) 420 -40 MAX4815 toc11 DUAL ±5.5V SUPPLIES 480 CROSSTALK vs. FREQUENCY 140 MAX4815 toc10 540 MAX4815 toc12 COM(ON) LEAKAGE CURRENT vs. TEMPERATURE 80 60 40 -80 -100 20 0 0 -60 -15 10 35 60 -120 -5 85 -3 -1 3 5 0.1 FREQUENCY RESPONSE T1 (100Ω) PULSE TEMPLATE TEST LOSS (dB) -20 -3 -4 -40 -60 -5 -80 -6 -7 10 100 1000 1 10 100 FREQUENCY (MHz) T1 (100Ω) SCOPE SHOT OF THE INPUT AND OUTPUT OF DEVICE NORMALIZED AMPLITUDE 1.1 OUTPUT 1V/div -500 -300 -100 100 300 500 700 E1 (120Ω) SCOPE SHOT OF THE INPUT AND OUTPUT OF DEVICE MAX4815 toc18 MAX4815 toc17 1.3 INPUT 1V/div 0 TIME (ns) E1 (120Ω) PULSE TEMPLATE TEST MAX4815 toc16 0.3 -0.6 0.1 FREQUENCY (MHz) 0.6 -0.3 -100 1 0.9 NORMALIZED AMPLITUDE 0 -2 1.2 MAX4815 toc14 20 MAX4815 toc13 -1 100 10 FREQUENCY (MHz) OFF-ISOLATION vs. FREQUENCY 0 0.1 1 VCOM_ (V) TEMPERATURE (°C) LOSS (dB) 1 MAX4815 toc15 -40 0.9 0.7 INPUT 1V/div 0.5 0.3 0.1 OUTPUT 1V/div -0.1 -0.3 200ns/div -250 -200 -150 -100 -50 0 50 100 150 200 250 100ns/div TIME (ns) _______________________________________________________________________________________ 7 MAX4815/MAX4816/MAX4817 Typical Operating Characteristics (continued) (V+ = +3.3V, V- = -3.3V, TA = +25°C, unless otherwise noted.) Typical Operating Characteristics (continued) (V+ = +3.3V, V- = -3.3V, TA = +25°C, unless otherwise noted.) E1 (75Ω) SCOPE SHOT OF THE INPUT AND OUTPUT OF DEVICE E1 (75Ω) PULSE TEMPLATE TEST MAX4815 toc20 MAX4815 toc19 1.3 1.1 NORMALIZED AMPLITUDE MAX4815/MAX4816/MAX4817 High-Bandwidth, T1/E1, SPST Analog Switches 0.9 0.7 INPUT 1V/div 0.5 0.3 0.1 OUTPUT 1V/div -0.1 -0.3 -250 -200 -150 -100 -50 0 50 100 150 200 250 100ns/div TIME (ns) Pin Description PIN FUNCTION MAX4816 MAX4817 1 — — NC1 2 2 2 V- 3 3 3 GND Ground 4 — — NC4 Analog Switch Normally Closed Terminal 4 5 5 5 COM4 6 6 6 IN4 Switch 4 Logic-Control Input Switch 3 Logic-Control Input Analog Switch Normally Closed Terminal 1 Negative Supply Voltage. Bypass V- to ground with a 0.1µF ceramic capacitor. Analog Switch Common Terminal 4 7 7 7 IN3 8 8 8 COM3 9 — 9 NC3 Analog Switch Normally Closed Terminal 3 10 10 10 N.C. No Connection. Not internally connected. 11 11 11 V+ Analog Switch Common Terminal 3 Positive Supply Voltage. Bypass V+ to ground with a 0.1µF ceramic capacitor. 12 — 12 NC2 13 13 13 COM2 14 14 14 IN2 Switch 2 Logic-Control Input 15 15 15 IN1 Switch 1 Logic-Control Input 16 16 16 COM1 — 1 1 NO1 Analog Switch Normally Open Terminal 1 — 4 4 NO4 Analog Switch Normally Open Terminal 4 — 9 — NO3 Analog Switch Normally Open Terminal 3 — 12 — NO2 EP 8 NAME MAX4815 EP EP EP Analog Switch Normally Closed Terminal 2 Analog Switch Common Terminal 2 Analog Switch Common Terminal 1 Analog Switch Normally Open Terminal 2 Exposed Paddle. Connect exposed paddle to V- or leave unconnected. _______________________________________________________________________________________ High-Bandwidth, T1/E1, SPST Analog Switches The MAX4815/MAX4816/MAX4817 are high-bandwidth, low-on-resistance, quad-SPST analog switches targeted to serve as integrated T1/E1 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 MAX4815/MAX4816/MAX4817 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 550MHz, 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 MAX4815/MAX4816/MAX4817 is very low and stable as the analog signals are swept from V- to V+ (see the Typical Operating Characteristics). Fault Protection The fault protection of the MAX4815/MAX4816/ MAX4817 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 T1/E1 redundancy applications, this can happen when the load resistor (RL) 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 MAX4815/MAX4816/MAX4817 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 MAX4815/MAX4816/MAX4817 have relatively high input impedance when V+ and V- are 5V ±10% TTIP 1:2 MAX4815 MAX4816 MAX4817 COM_ NC_ 10V ±10% RL LIU Tx + Vo - TRING Figure 1. Fault Protection unconnected or connected to GND. Therefore, the devices are not destroyed by a hot insertion. In order to guarantee data integrity, the V+ and V- supplies must be properly biased. Applications Information T1/E1 N+1 Redundancy The MAX4815/MAX4816/MAX4817 are designed for adjacent line-card protection applications. Figures 6 and 7 show a basic architecture for twisted-pair interface (120Ω E1, or 100Ω 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 MAX4815/ MAX4816/MAX4817 sitting in the line cards where they can reroute any of the input/output signals to a protection line card. Figure 7 shows the MAX4815/MAX4816/ MAX4817 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 MAX4815/MAX4816/MAX4817 yield good pulse template and return-loss performance (see the Typical Operating Characteristics). The pulse template tests for E1 (twisted pair interface 120Ω and coaxial interface 75Ω) and T1 (twisted pair interface 100Ω) 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 120Ω (twisted pair) and 75Ω (coaxial) loads. The analog switches were powered with dual power supplies at ±5V. _______________________________________________________________________________________ 9 MAX4815/MAX4816/MAX4817 Detailed Description MAX4815/MAX4816/MAX4817 High-Bandwidth, T1/E1, SPST Analog Switches Test Circuits/Timing Diagrams V+ 3V V+ NO_ OR NC_ VIN_ 3V 50% 0V MAX4815 MAX4816 IN_ MAX4817 COM_ VIN_ GND 3V 90% VOUT 90% VOUT V- CL RL 0V tOFF V- tON Figure 2. Switch Turn-On/Turn-Off Times V+ VIN_ IN_ V+ RGEN NO_ OR NC_ MAX4815 MAX4816 MAX4817 GND 3V VGEN VIN_ 0V VOUT COM_ VOUT ΔVOUT VCL V- ΔVOUT IS THE MEASURED VOLTAGE DUE TO CHARGETRANSFER ERROR Q WHEN THE CHANNEL TURNS OFF. Q = ΔVOUT x CL Figure 3. Charge Injection 50Ω RESISTOR ONLY NEEDED FOR CROSSTALK AND ISOLATION V+ 0.1μF VIN V+ NETWORK ANALYZER 50Ω 50Ω COM_ V+ IN_ MAX4815 MAX4816 MAX4817 50Ω VOUT NO_, NC_ GND V- MEAS REF 50Ω 50Ω 0.1μF VMEASUREMENTS 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 10 ______________________________________________________________________________________ High-Bandwidth, T1/E1, SPST Analog Switches V+ 0.1μF V+ NC_ (OR NO_) V+ IN_ MAX4815 MAX4816 MAX4817 1MHz CAPACITANCE ANALYZER COM_ V- GND 0.1μF V- Figure 5. Channel Off-/On-Capacitance ______________________________________________________________________________________ 11 MAX4815/MAX4816/MAX4817 Test Circuits/Timing Diagrams (continued) MAX4815/MAX4816/MAX4817 High-Bandwidth, T1/E1, SPST Analog Switches LINE CARD 1 MAX4815 MAX4816 MAX4817 T1/E1 LIU Tx/Rx I/O 1 LINE CARD 2 MAX4815 MAX4816 MAX4817 T1/E1 LIU Tx/Rx I/O 2 LINE CARD N MAX4815 MAX4816 MAX4817 T1/E1 LIU Tx/Rx I/O N PROTECTION LINE CARD MAX4815 MAX4816 MAX4817 T1/E1 LIU Tx/Rx BACKPLANE SINGLE-ENDED-TODIFFERENTIAL CONVERSION Figure 6. Adjacent Line-Card Protection Architecture with Switches in the Line Cards for Twisted Pair Cable (120Ω E1, or 100Ω T1). Figure for coaxial cable (75Ω E1) is the same without the single-ended-to-differential conversion. 12 ______________________________________________________________________________________ High-Bandwidth, T1/E1, SPST Analog Switches MAX4815/MAX4816/MAX4817 LINE CARD 1 MAX4815 MAX4816 MAX4817 T1/E1 LIU Tx/Rx I/O 1 LINE CARD 2 MAX4815 MAX4816 MAX4817 T1/E1 LIU Tx/Rx I/O 2 LINE CARD N MAX4815 MAX4816 MAX4817 T1/E1 LIU Tx/Rx I/O N PROTECTION LINE CARD MAX4815 MAX4816 MAX4817 T1/E1 LIU Tx/Rx PROTECTION SWITCHING CARD SINGLE-ENDED-TODIFFERENTIAL CONVERSION Figure 7. Adjacent Line-Card Protection Architecture with Switches out of the Line Cards for Twisted Pair Cable (120Ω E1, or 100Ω T1). Figure for coaxial cable (75Ω E1) is the same without the single-ended-to-differential conversion. ______________________________________________________________________________________ 13 High-Bandwidth, T1/E1, SPST Analog Switches 9 COM2 13 8 COM3 IN2 14 7 IN3 COM2 13 IN2 14 NC3 10 N.C. NO3 11 V+ N.C. 12 TOP VIEW NC2 V+ TOP VIEW NO2 MAX4815/MAX4816/MAX4817 Pin Configurations (continued) 12 11 10 9 4 COM4 THIN QFN (5mm x 5mm) *EXPOSED PADDLE CONNECTED TO V- 15 COM1 16 + *EP 1 2 3 4 NO4 3 5 IN1 GND 2 IN4 V- 1 NO4 *EP 6 NO1 + GND 16 V- COM1 NO1 15 COM3 7 IN3 6 IN4 5 COM4 MAX4817 MAX4816 IN1 8 THIN QFN (5mm x 5mm) *EXPOSED PADDLE CONNECTED TO V- Chip Information PROCESS: BiCMOS CONNECT EXPOSED PADDLE TO V-. 14 ______________________________________________________________________________________ High-Bandwidth, T1/E1, SPST Analog Switches .. . . .. .. . LINE CARD N .. . ... .. . LINE CARD 2 LINE CARD 1 IN1 T1/E1 LIU Tx NO1 COM1 NO2 COM2 IN2 ZL IN3 NO3 COM3 IN4 NO4 COM4 T1/E1 LIU Rx TRANSMIT ZL MAX4816 RECEIVE ZL ZL PROTECTION LINE CARD IN1 NO1 COM1 NO4 COM4 T1/E1 LIU Rx ZL IN4 T1/E1 LIU Rx ZL MAX4816 ZL = 75Ω, 100Ω, OR 120Ω ______________________________________________________________________________________ 15 MAX4815/MAX4816/MAX4817 Typical Operating Circuit High-Bandwidth, T1/E1, SPST Analog Switches MAX4815/MAX4816/MAX4817 Functional Diagram V+ IN1 COM1 NC1 COM2 COM3 COM2 NO2 COM4 COM3 NO3 GND IN_ NC_ 0 ON 1 OFF 16 IN2 COM2 NC2 IN3 COM3 NC3 IN4 IN4 NO4 COM4 V- MAX4815 COM1 NO1 IN3 IN4 NC4 IN1 IN2 IN3 NC3 V+ IN1 COM1 NO1 IN2 NC2 V+ V- MAX4816 GND IN_ NO_ 0 OFF 1 ON NO4 COM4 V- MAX4817 GND IN_ NC_ NO_ 0 ON OFF 1 OFF ON ______________________________________________________________________________________ High-Bandwidth, T1/E1, SPST Analog Switches 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, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 17 © 2007 Maxim Integrated Products Boblet is a registered trademark of Maxim Integrated Products, Inc. MAX4815/MAX4816/MAX4817 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 www.maxim-ic.com/packages.)