19-1542; Rev 0; 10/99 Rail-to-Rail, Fault-Protected, SPST Analog Switches On-resistance is 160 max. The off-leakage current is only 0.5nA at +25C and 10nA at +85C. The MAX4510 is a normally closed switch, while the MAX4520 is a normally open switch. These CMOS switches operate with dual power supplies ranging from 4.5V to 20V or a single supply between +9V and +36V. The digital input has +0.8V and +2.4V logic thresholds, ensuring both TTL- and CMOS-logic compatibility when using 15V or a single +12V supply. The MAX4510/ MAX4520 are available in 6-pin SOT23 and 8-pin MAX packages. Features 40V Fault Protection with Power Off 36V Fault Protection with 15V Supplies Switch is Off with Power Removed Rail-to-Rail Signal Handling 160 max Signal Paths with 15V Supplies On-Switch Turns Off with Overvoltage 0.5nA Off-Leakage Current Output Clamped to Appropriate Supply Voltage During Fault Condition; No Transition Glitch No Power-Supply Sequencing Required 4.5V to 20V Dual Supplies +9V to +36V Single Supply Low Power Consumption: <2mW TTL- and CMOS-Compatible Logic Inputs with Single +9V to +15V or 15V Supplies Pin Configurations/Truth Tables Applications Data Acquisition TOP VIEW Industrial and Process-Control Systems Avionics V+ 1 V- 2 IN 3 ATE Equipment Redundant/Backup Systems MAX4510 MAX4520 6 NC (NO) 5 COM 4 GND SOT23 Ordering Information ( ) ARE FOR MAX4520. TEMP. RANGE PINPACKAGE TOP MARK MAX4510EUT-T -40C to +85C 6 SOT23-6 AABZ MAX4510EUA 8 MAX PART -40C to +85C MAX4520EUT-T -40C to +85C MAX4520EUA -40C to +85C 6 SOT23-6 8 MAX -- IN MAX4510 MAX4520 0 ON OFF 1 OFF ON AADK -- Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd. SWITCHES SHOWN FOR LOGIC "0" INPUT. ALL SWITCHES ARE OFF WITH POWER REMOVED. Pin Configurations continued at end of data sheet. ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. MAX4510/MAX4520 General Description The MAX4510/MAX4520 single-pole/single-throw (SPST), fault-protected analog switches feature a fault-protected input and Rail-to-Rail(R) signal-handling capability. The normally open (NO) and normally closed (NC) terminals are protected from overvoltage faults up to 36V during power-on and 44V with power off. During a fault condition, the switch input terminal (NO or NC) becomes an open circuit; only nanoamperes of leakage current flow from the fault source, and the switch output (COM) furnishes up to 13mA of the appropriate polarity supply voltage to the load. This ensures unambiguous rail-to-rail outputs when a fault begins and ends. MAX4510/MAX4520 Rail-to-Rail, Fault-Protected, SPST Analog Switches ABSOLUTE MAXIMUM RATINGS (Voltages Referenced to GND) V+ ........................................................................-0.3V to +44.0V V- .........................................................................-44.0V to +0.3V V+ to V-................................................................-0.3V to +44.0V COM, IN (Note 1)..................................(V- - 0.3V) to (V+ + 0.3V) NC, NO (Note 2) .....................................(V+ - 36V) to (V- + 36V) NC, NO to COM.......................................................-36V to +36V Continuous Current into Any Terminal..............................30mA Peak Current into Any Terminal (pulsed at 1ms, 10% duty cycle)...................................50mA Continuous Power Dissipation (TA = +70C) (Note 2) 6-Pin SOT23-6 (derate 7.1mW/C above +70C) .........696mW 8-Pin MAX (derate 4.10mW/C above +70C) ............330mW Operating Temperature Ranges MAX45_0EUT....................................................-40C to +85C MAX45_0EUA ...................................................-40C to +85C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10sec) .............................+300C Note 1: COM and IN pins are not fault protected. Signals on COM or IN exceeding V+ or V- are clamped by internal diodes. Limit forward diode current to maximum current rating. Note 2: NC and NO pins are fault protected. Signals on NC or NO exceeding -36V to +36V may damage the device. These limits apply with power applied to V+ or V-, or 40V with V+ = V- = 0. 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 Supplies (V+ = +15V, V- = -15V, GND = 0, VIH = 2.4V, VIL = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 3) PARAMETER SYMBOL CONDITIONS TA MIN E V- TYP MAX UNITS V+ V ANALOG SWITCH Fault-Free Analog Signal Range On-Resistance VNO, VNC Applies with power on or off RON VCOM = 10V, ICOM = 1mA +25C 125 E 160 225 NO or NC Off-Leakage Current (Notes 4, 5) INO(OFF), INC(OFF) VCOM = 14V; - VNO, VCOM = +14V +25C -0.5 E -10 COM Off-Leakage Current (Notes 4, 5) ICOM(OFF) VCOM = 14V; - 14V VNO, VNC = + +25C -0.5 E -10 COM On-Leakage Current (Notes 4, 5) ICOM(ON) VCOM = 14V; VNO, VNC = 14V or unconnected +25C -0.5 E -20 0.01 0.5 10 0.01 0.5 10 0.01 0.5 20 nA nA nA FAULT (V+ = +15V, V- = -15V, unless otherwise noted.) -36 36 -40 40 +25C -10 10 E -200 200 VNO, VNC COM Off-Leakage Current, Supplies On ICOM(OFF) VNO or VNC = 36V NO or NC Input Leakage Current, Supplies On INO, INC VNO or VNC = 36V, - 10V VCOM = + +25C -20 20 E -200 200 NO or NC Input Leakage Current, Supplies Off INO, INC VNO or VNC = 40V, V+ = 0, V- = 0 +25C -20 E -200 Clamp Output Current, Supplies On 2 Applies with power on (Note 6) Fault-Protected Analog Signal Range ICOM Applies with power off (Note 6) VNO or VNC = 36V VNO or VNC = -36V E +25C 0.1 20 200 8 11 13 -12 -10 -7 _______________________________________________________________________________________ V nA nA nA mA Rail-to-Rail, Fault-Protected, SPST Analog Switches (V+ = +15V, V- = -15V, VIH = 2.4V, VIL = 0.8V, GND = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 3) PARAMETER Clamp Output Resistance, Supplies On SYMBOL RCOM CONDITIONS VNO or VNC = 36V Fault Trip Threshold TA MIN +25C TYP 1 E +25C MAX 2.5 3 V- - 0.4 V+ + 0.4 UNITS k V Fault Output Turn-On Delay Time VIN = 25V, RL = 10k +25C 10 ns Fault Recovery Time VIN = 25V, RL = 10k +25C 2.5 s LOGIC INPUT IN Input Logic High VINH E IN Input Logic Low VINL E IN Input Current IINH, IINL VIN = 0.8V or 2.4V 2.4 V 0.8 +25C -1 E -5 0.03 1 5 V A SWITCH DYNAMIC CHARACTERISTICS Turn-On Time tON VNO or VNC = 10V, RL = 2k, CL = 35pF, Figure 2 +25C Turn-Off Time tOFF VNO or VNC = 10V, RL = 2k, CL = 35pF, Figure 2 +25C Charge Injection (Note 7) NO or NC Off-Capacitance 350 E 500 600 60 E 175 250 Q CL = 1nF, VNO = 0, RS = 0, Figure 3 +25C 1.5 5 ns ns pC CN(OFF) f = 1MHz, Figure 4 +25C 10 pF COM Off-Capacitance CCOM(OFF) f = 1MHz, Figure 4 +25C 5 pF COM On-Capacitance CCOM(ON) f = 1MHz, Figure 4 +25C 10 pF RL = 50, CL = 15pF, VN_ = 1VRMS, f = 1MHz, Figure 5 +25C -62 dB Off-Isolation (Note 8) VCISO POWER SUPPLY Power-Supply Range V+, V- E V+ Supply Current I+ VIN = 0 or 5V V- Supply Current I- VIN = 0 or 5V VIN = 0 or 15V GND Supply Current IGND VIN = 5V 4.5 +25C 20 100 E +25C 50 E +25C E 100 175 -1 0.01 E +25C 175 250 A A 1 10 50 V 100 A 175 _______________________________________________________________________________________ 3 MAX4510/MAX4520 ELECTRICAL CHARACTERISTICS--Dual Supplies (continued) MAX4510/MAX4520 Rail-to-Rail, Fault-Protected, SPST Analog Switches ELECTRICAL CHARACTERISTICS--Single +12V Supply (V+ = +12V, V- = 0, GND = 0, VIH = 2.4V, VIL = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 3) PARAMETER SYMBOL CONDITIONS TA MIN E 0 TYP MAX UNITS V+ V 260 390 ANALOG SWITCH Fault-Free Analog Signal Range On-Resistance VNO, VNC RON Applies with power on or off VCOM = 10V, ICOM = 1mA +25C E 500 NO or NC Off-Leakage Current (Notes 4, 5, 9) INO(OFF), INC(OFF) VCOM = 10V, 1V; VNO, VNC = 1V, 10V +25C -0.5 0.01 0.5 E -10 COM Off-Leakage Current (Notes 4, 5, 9) ICOM(OFF) VCOM = 1V, 10V; VNO, VNC = 10V, 1V +25C -0.5 E -10 COM On-Leakage Current (Notes 4, 5, 9) ICOM(ON) VCOM = 1V, 10V; VNO, VNC = 1V, 10V, or unconnected +25C -0.5 E -20 20 -36 36 -40 40 10 0.01 0.5 10 0.01 0.5 nA nA nA FAULT Fault-Protected Analog Signal Range COM Off-Leakage Current, Supply On VNO, VNC Applies with power on (Note 6) Applies with power off (Note 6) E +25C -10 10 E -200 200 ICOM VNO or VNC = 36V NO or NC Input Leakage Current, Supply On INO, INC VNO or VNC = 36V, VCOM = 0 +25C -20 20 E -200 200 NO or NC Input Leakage Current, Supply Off INO, INC VNO or VNC = 40V, V+ = 0, V- = 0 +25C -20 E -200 2 Clamp Output Current, Supply On ICOM VNO or VNC = 36V +25C Clamp Output Resistance, Supply On RCOM VNO or VNC = 36V +25C 0.1 20 200 V nA nA nA 3 5 mA 2.4 5 k LOGIC INPUT IN Input Logic High VINH IN Input Logic Low VINL E IINH, IINL +25C E IN Input Current 4 E VIN = 0.8V or 2.4V 2.4 V 0.8 -1 -5 0.03 _______________________________________________________________________________________ 1 5 V A Rail-to-Rail, Fault-Protected, SPST Analog Switches (V+ = +12V, V- = 0, GND = 0, VIH = 2.4V, VIL = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 3) PARAMETER SYMBOL CONDITIONS TA MIN TYP MAX UNITS SWITCH DYNAMIC CHARACTERISTICS Turn-On Time tON VNO or VNC = 7V, RL = 2k, CL = 35pF, Figure 2 +25C Turn-Off Time tOFF VNO or VNC = 7V, RL = 2k, CL = 35pF, Figure 2 +25C 500 E 750 1000 60 E 200 300 ns ns Q CL = 1nF, VNO = 0, RS = 0, Figure 3 +25C 1 NO or NC Off-Capacitance CNO(OFF), CNC(OFF) f = 1MHz, Figure 4 +25C 9 pF COM Off-Capacitance CCOM(OFF) VCOM = 0, f = 1MHz, Figure 4 +25C 9 pF COM On-Capacitance CCOM(ON) VCOM = VNO = 0, f = 1MHz, Figure 4 +25C 22 pF RL = 50, CL = 15pF, VIN = 1VRMS, f = 1MHz, Figure 5 +25C -62 dB Charge Injection (Note 7) Off-Isolation (Note 8) VISO 5 pC POWER SUPPLY Power-Supply Range V+ Supply Current V+ I+ E VIN = 0 or 5V VIN = 0 or 12V V- and GND Supply Current IGND VIN = 0 or 5V Note 3: Note 4: Note 5: Note 6: Note 7: Note 8: Note 9: +25C 9 36 50 E +25C 175 25 E +25C E 125 75 125 50 125 175 V A A A Algebraic convention is used in this data sheet; the most negative value is shown in the minimum column. Leakage parameters are 100% tested at maximum-rated hot temperature and guaranteed by correlation at TA = +25C. SOT packages are 100% tested at +25C. Limits at the maximum-rated temperature are guaranteed by design and correlation limits at +25C. Leakage tests for the SOT package are typical only. NC and NO pins are fault protected. Signals on NC or NO exceeding -36V to +36V may damage the device. These limits apply with power applied to V+ or V-, or 40V with V+ = V- = 0. Guaranteed by design. Off isolation = 20log10 [ VCOM / (VNC or VNO) ], VCOM = output, VNC or VNO = input to off switch. Leakage testing for single-supply operation is guaranteed by testing with dual supplies. _______________________________________________________________________________________ 5 MAX4510/MAX4520 ELECTRICAL CHARACTERISTICS--Single +12V Supply (continued) __________________________________________Typical Operating Characteristics (TA = +25C, unless otherwise noted.) SWITCH ON-RESISTANCE vs. VCOM AND TEMPERATURE (DUAL SUPPLIES) 150 100 V+ = +15V V- = -15V 50 140 120 100 80 60 TA = +25C TA = -40C -10 -5 0 5 10 15 -10 -5 0 5 10 VCOM (V) VCOM (V) SWITCH ON-RESISTANCE vs. VCOM AND TEMPERATURE (SINGLE SUPPLY) ID(ON), IS(OFF), AND ID(OFF) LEAKAGES vs. TEMPERATURE TA = +125C 350 TA = +85C LEAKAGE (A) TA = +25C TA = -40C 250 200 150 ICOM(ON) AT VNO = VCOM = +14V 100p 50 0 2 4 6 8 10 12 SINGLE +12V SUPPLY 2 -25 0 25 50 75 -15 100 125 150 -10 -5 0 5 10 ON- AND OFF-TIMES vs. SUPPLY VOLTAGE ON- AND OFF-TIMES vs. TEMPERATURE POWER-SUPPLY CURRENT vs. TEMPERATURE 500 500 400 tOFF (SINGLE SUPPLY) 300 200 tOFF (DUAL SUPPLIES) 400 300 200 tOFF 5 10 15 SUPPLY VOLTAGE (V) 20 V+ = +15V V- = -15V VIN = +5V I+ tON 15 100 IGND 50 0 -50 I- 100 -100 0 0 150 SUPPLY CURRENT (A) tON, tOFF (ns) 600 200 MAX4510-08 600 MAX4510-07 700 MAX4510-03 6 0 -50 tON (SINGLE SUPPLY) 40 DUAL 15V SUPPLIES 8 VCOM (V) tON (DUAL SUPPLIES) 0 35 TEMPERATURE (C) 900 100 30 VCOM (V) 1000 800 20 25 VCOM (V) 4 1p 0 15 V+ = +15V V- = -15V 12 INO(OFF) AT VNO = +14V, VCOM = -14V V+ = +12V 10 14 INO(OFF) AT VNO = -14V, VCOM = +14V 10p 5 10 ICOM(ON) AT VNO = VCOM = -14V TA = -55C 100 0 ICOM(OFF) AT VNO = +14V, VCOM = -14V 1n V+ = +30V V+ = +36V CHARGE INJECTION vs. VCOM (DUAL SUPPLIES) ICOM(OFF) AT VNO = -14V, VCOM = +14V 10n 300 V+ = +24V 15 100n MAX4510-04 400 10 1 -15 20 Q (pC) -15 V+ = +5V V+ = +12V V+ = +15V V+ = +20V V+ = +15V V- = -15V 20 0 -20 SWITCH ON-RESISTANCE () TA = -55C 40 V+ = +20V V- = -20V 0 6 MAX4510-02 160 1000 MAX4510-06 200 TA = +85C SWITCH ON-RESISTANCE () V+ = +12V V- = -12V V+ = +10V V- = -10V TA = +125C MAX4510-05 SWITCH ON-RESISTANCE () 250 180 SWITCH ON-RESISTANCE () V+ = +5V V- = -5V 300 200 MAX4510-01 350 SWITCH ON-RESISTANCE vs. VCOM (SINGLE SUPPLY) MAX4510/20 toc 09 SWITCH ON-RESISTANCE vs. VCOM (DUAL SUPPLIES) tON, tOFF (ns) MAX4510/MAX4520 Rail-to-Rail, Fault-Protected, SPST Analog Switches -150 -50 -25 0 25 50 75 TEMPERATURE (C) 100 125 -40 -20 0 20 40 60 TEMPERATURE (C) _______________________________________________________________________________________ 80 100 Rail-to-Rail, Fault-Protected, SPST Analog Switches LOGIC-LEVEL THRESHOLD vs. V+ FREQUENCY RESPONSE 2.5 -10 MAX4510/20 TOC11 MAX4511-10 0 ON LOSS -20 -30 2.0 LOSS (dB) LOGIC-LEVEL THRESHOLD (V) 3.0 1.5 -40 SS -50 F OF -60 LO -70 1.0 -80 -90 0.5 V+ = +15V V- = -15V -100 0 -110 0 5 10 15 20 25 30 35 V+ (V) PIN 1000 Overview of Traditional Fault-Protected Switches V+ Positive Supply Voltage Input 2 5 V- Negative Supply Voltage Input. Connect to GND for single-supply operation. 3 6 IN Logic Control Digital Input 4 4 GND Ground 5 1 COM Analog Switch Common Terminal Fault-Protected Analog Switch--normally closed NC or NO (NC) for MAX4510; normally open (NO) for MAX4520 N.C. 100 FUNCTION NAME 8 2, 7 10 Detailed Description 1 -- 1 Pin Description MAX 3 0.1 FREQUENCY (MHz) SOT23-6 6 0.01 No Connection. Not internally connected. The MAX4510/MAX4520 are fault-protected CMOS analog switches with unusual operation and construction. Traditional fault-protected switches are constructed by three series FETs. This produces good off characteristics, but fairly high on-resistance when the signals are within about 3V of each supply rail. As the voltage on one side of the switch approaches within about 3V of either supply rail (a fault condition), the switch impedance becomes higher, limiting the output signal range (on the protected side of the switch) to approximately 3V less than the appropriate polarity supply voltage. During a fault condition, the output current that flows from the protected side of the switch into its load comes from the fault source on the other side of the switch. If the switch is open or the load is extremely high impedance, the input current will be very low. If the switch is on and the load is low impedance, enough current will flow from the source to maintain the load voltage at 3V less than the supply. _______________________________________________________________________________________ 7 MAX4510/MAX4520 Typical Operating Characteristics (continued) (TA = +25C, unless otherwise noted.) MAX4510/MAX4520 Rail-to-Rail, Fault-Protected, SPST Analog Switches NORMALLY OPEN SWITCH CONSTRUCTION V+ P2 HIGH FAULT P1 COM NO (NC) N1 LOW FAULT ON IN GND N2 V-ESD DIODE NC SWITCH MAX4510 MAX4520 Figure 1. Functional Diagram Overview of MAX4510/MAX4520 The MAX4510/MAX4520 differ considerably from traditional fault-protection switches, with several advantages. First, they are constructed with two parallel FETs, allowing very low on-resistance when the switch is on. Second, they allow signals on the NC or NO pins that are within or slightly beyond the supply rails to be passed through the switch to the COM terminal, allowing rail-to-rail signal operation. Third, when a signal on NC or NO exceeds the supply rails by about 50mV (a fault condition), the voltage on COM is limited to the appropriate polarity supply voltage. Operation is identical for both fault polarities. The fault-protection extends to 36V from GND. During a fault condition, the NO or NC input pin becomes high impedance regardless of the switch state or load resistance. If the switch is on, the COM output current is furnished from the V+ or V- pin by "booster" FETs connected to each supply pin. These FETs can typically source or sink up to 13mA. 8 When power is removed, the fault protection is still in effect. In this case, the NO or NC terminals are a virtual open circuit. The fault can be up to 40V. The COM pin is not fault protected; it acts as a normal CMOS switch pin. If a voltage source is connected to the COM pin, it should be limited to the supply voltages. Exceeding the supply voltage will cause high currents to flow through the ESD protection diodes, possibly damaging the device (see Absolute Maximum Ratings). Internal Construction Internal construction is shown in Figure 1, with the analog signal paths shown in bold. A single normally open (NO) switch is shown; the normally closed (NC) configuration is identical except the logic-level translator becomes an inverter. The analog switch is formed by the parallel combination of N-channel FET N1 and Pchannel FET P1, which are driven on and off simultaneously according to the input fault condition and the logic-level state. _______________________________________________________________________________________ Rail-to-Rail, Fault-Protected, SPST Analog Switches Positive Fault Condition When the signal on NO (or NC) exceeds V+ by about 50mV, the high-fault comparator output is high, turning off FETs N1 and P1. This makes the NO (or NC) pin high impedance regardless of the switch state. If the switch state is "off," all FETs are turned off and both NO (or NC) and COM are high impedance. If the switch state is "on," FET P2 is turned on, sourcing current from V+ to COM. Negative Fault Condition than 300mV, one of these diodes will conduct heavily. During normal operation these reverse-biased ESD diodes leak a few nanoamps of current to V+ and V-. Fault-Protection Voltage and Power Off The maximum fault voltage on the NC or NO pins is 36V with power applied and 40V with power off. Failure Modes The MAX4510/MAX4520 are not lightning arrestors or surge protectors. Exceeding the fault-protection voltage limits on NO or NC, even for very short periods, can cause the device to fail. Ground There is no connection between the analog signal path and GND. The analog signal path consists of an Nchannel and P-channel MOSFET with their sources and drains paralleled and their gates driven out of phase to V+ and V- by the logic-level translators. When the signal on NO (or NC) exceeds V- by about 50mV, the low-fault comparator output is high, turning off FETs N1 and P1. This makes the NO (or NC) pin high impedance regardless of the switch state. If the switch state is "off," all FETs are turned off and both NO (or NC) and COM are high impedance. If the switch state is "on," FET N2 is turned on, sinking current from COM to V-. V+ and GND power the internal logic and logic-level translators and set the input logic thresholds. The logiclevel translators convert the logic levels to switched V+ and V- signals to drive the gates of the analog switch. This drive signal is the only connection between the power supplies and the analog signal. GND, IN, and COM have ESD-protection diodes to V+ and V-. Transient Fault Response and Recovery The logic-level thresholds are CMOS and TTL compatible when V+ is +15V. As V+ is raised, the threshold increases slightly, and when V+ reaches 25V, the level threshold is about 2.8V--above the TTL output highlevel minimum of 2.4V, but still compatible with CMOS outputs (see Typical Operating Characteristics). Increasing V- has no effect on the logic-level thresholds, but it does increase the gate-drive voltage to the signal FETs, reducing their on-resistance. When a fast rise-time and fall-time transient on IN exceeds V+ or V-, the output (COM) follows the input (IN) to the supply rail with only a few nanoseconds delay. This delay is due to the switch on-resistance and circuit capacitance to ground. When the input transient returns to within the supply rails, however, there is a longer output recovery time delay. For positive faults, the recovery time is typically 3.5s. For negative faults, the recovery time is typically 1.3s. These values depend on the COM output resistance and capacitance. The delays are not dependent on the fault amplitude. Higher COM output resistance and capacitance increase recovery times. COM and IN Pins FETs N2 and P2 can source about 13mA from V+ or Vto the COM pin in the fault condition. Ensure that if the COM pin is connected to a low-resistance load, the absolute maximum current rating of 30mA is never exceeded, both in normal and fault conditions. The GND, COM, and IN pins do not have fault protection. Reverse ESD-protection diodes are internally connected between GND, COM, IN, and both V+ and V-. If a signal on GND, COM, or IN exceeds V+ or V- by more IN Logic-Level Thresholds Dual Supplies The MAX4510/MAX4520 operate with dual supplies between 4.5V and 20V. The V+ and V- supplies need not be symmetrical, but their difference cannot exceed the absolute maximum rating of 44V. Single Supply The MAX4510/MAX4520 operate from a single supply between +9V and +36V when V- is connected to GND. _______________________________________________________________________________________ 9 MAX4510/MAX4520 Normal Operation Two comparators continuously compare the voltage on the NO (or NC) pin with V+ and V-. When the signal on NO or NC is between V+ and V-, the switch acts normally, with FETs N1 and P1 turning on and off in response to IN signals. The parallel combination of N1 and P1 forms a low-value resistor between NO (or NC) and COM so that signals pass equally well in either direction. MAX4510/MAX4520 Rail-to-Rail, Fault-Protected, SPST Analog Switches Test Circuits/Timing Diagrams V+ V+ NO OR NC LOGIC INPUT VNO OR VNC t r < 20ns t f < 20ns +3V 50% 0V MAX4510 MAX4520 VIN IN t OFF VOUT COM VOUT GND 50 V- 2k 35pF SWITCH OUTPUT 0V 0.9 * V0UT 0.9 * VOUT t ON VLOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES THAT HAVE THE OPPOSITE LOGIC SENSE. V- IS CONNECTED TO GND FOR SINGLE-SUPPLY OPERATION. Figure 2. Switch Turn-On/Turn-Off Times V+ V+ V+ VIN IN 50 NO OR NC VIN 0V MAX4510 MAX4520 COM GND V- V- V- IS CONNECTED TO GND FOR SINGLE-SUPPLY OPERATION. VOUT VOUT CL 1000pF VOUT IS THE MEASURED VOLTAGE DUE TO CHARGETRANSFER ERROR Q WHEN THE CHANNEL TURNS OFF. Q = VOUT * CL Figure 3. Charge Injection 10 VOUT ______________________________________________________________________________________ Rail-to-Rail, Fault-Protected, SPST Analog Switches V+ V+ NO OR NC MAX4510 MAX4520 IN VIN GND 1MHz CAPACITANCE ANALYZER COM V- VV- IS CONNECTED TO GND FOR SINGLE-SUPPLY OPERATION. Figure 4. COM, NO, and NC Capacitance V+ 10nF NETWORK ANALYZER V+ VIN 50 50 COM MAX4510 MAX4520 VIN VOUT IN NO, NC V- GND MEAS REF 50 OFF-ISOLATION = 20log VOUT VIN ON-LOSS = 20log VOUT VIN 50 10nF V- MEASUREMENTS ARE STANDARDIZED AGAINST SHORT AT SOCKET TERMINALS. OFF ISOLATION IS MEASURED BETWEEN COM AND "OFF" NO OR NC TERMINALS. ON LOSS IS MEASURED BETWEEN COM AND "ON" NO OR NC TERMINALS. V- IS CONNECTED TO GND FOR SINGLE-SUPPLY OPERATION. Figure 5. Frequency Response and Off-Isolation Chip Information TRANSISTOR COUNT: 139 ______________________________________________________________________________________ 11 MAX4510/MAX4520 Test Circuits/Timing Diagrams (continued) Pin Configurations/Functional Diagrams/Truth Tables (continued) COM 1 8 V+ COM 1 8 V+ N.C. 2 7 N.C. N.C. 2 7 N.C. NC 3 6 IN NO 3 6 IN GND 4 5 V- GND 4 5 V- MAX4510 MAX MAX N.C. = NOT CONNECTED SWITCHES SHOWN FOR LOGIC "0" INPUT. ALL SWITCHES ARE OFF WITH POWER REMOVED. MAX4520 IN MAX4510 MAX4520 0 ON OFF 1 OFF ON ________________________________________________________Package Information 6LSOT.EPS MAX4510/MAX4520 Rail-to-Rail, Fault-Protected, SPST Analog Switches 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. 12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.