19-1515; Rev 0; 7/99 Fault-Protected, High-Voltage, Dual Analog Switches Features The MAX4631/MAX4632/MAX4633 high-voltage, dual analog switches are pin compatible with the industry-standard DG401/DG403/DG405. They upgrade the existing devices with fault-protected inputs and Rail-to-Rail® signal handling capabilities. The MAX4631/MAX4632/MAX4633’s normally open (NO) and normally closed (NC) terminals are protected from overvoltage faults up to 36V during power-up or power-down. During a fault condition, these terminals become open circuit and only nanoamperes of leakage current flow from the source, yet the switch output (COM_) continues to furnish up to 18mA of the appropriate polarity supply voltage to the load. This ensures unambiguous rail-to-rail outputs when a fault begins and ends. On-resistance is 85Ω (max) at +25°C and is matched between switches to 6Ω (max). Off-leakage current is only 0.5nA at +25°C and 5nA at +85°C. ♦ Fault Protection ±40V with Power Off ±36V with ±15V Supplies (MAX4631/MAX4633) ±25V with ±15V Supplies (MAX4632) The MAX4631 has two NO single-pole/single-throw (SPST) switches. The MAX4632 has two NO/NC single-pole/ double-throw (SPDT) switches. The MAX4633 has two NO double-pole/single-throw (DPST) switches. ♦ Pin Compatible with Industry-Standard DG401/DG403/DG405 These CMOS switches operate with dual power supplies ranging from ±4.5V to ±18V or a single supply between +9V and +36V. All digital inputs have +0.8V and +2.4V logic thresholds, ensuring both TTL- and CMOS-logic compatibility when using ±15V or a single +12V supply. Applications ATE Equipment Data Acquisition Industrial and Process Control Systems Avionics Redundant/Backup Systems Pin Configurations appear at end of data sheet. ♦ Rail-to-Rail Signal Handling ♦ No Power-Supply Sequencing Required ♦ All Switches Off with Power Off ♦ Output Clamped to Appropriate Supply Voltage During Fault Condition; No Transition Glitch ♦ 85Ω (max) Signal Paths with ±15V Supplies ♦ ±4.5V to ±18V Dual Supplies +9V to +36V Single Supply ♦ Low Power Consumption: <6mW ♦ TTL- and CMOS-Logic Compatible Inputs with Single +9V to +15V, or ±15V Supplies Ordering Information PART TEMP. RANGE PIN-PACKAGE MAX4631CSE 0°C to +70°C 16 Narrow SO MAX4631CPE MAX4631ESE MAX4631EPE 0°C to +70°C -40°C to +85°C -40°C to +85°C 16 Plastic DIP 16 Narrow SO 16 Plastic DIP MAX4631MJE MAX4632CSE MAX4632CPE -55°C to +125°C 0°C to +70°C 0°C to +70°C 16 CERDIP 16 Narrow SO 16 Plastic DIP MAX4632ESE MAX4632EPE MAX4632MJE -40°C to +85°C -40°C to +85°C -55°C to +125°C 16 Narrow SO 16 Plastic DIP 16 CERDIP MAX4633CSE MAX4633CPE MAX4633ESE 0°C to +70°C 0°C to +70°C -40°C to +85°C 16 Narrow SO 16 Plastic DIP 16 Narrow SO MAX4633EPE MAX4633MJE -40°C to +85°C -55°C to +125°C 16 Plastic DIP 16 CERDIP Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd. ________________________________________________________________ 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. MAX4631/MAX4632/MAX4633 General Description MAX4631/MAX4632/MAX4633 Fault-Protected, High-Voltage, Dual Analog Switches ABSOLUTE MAXIMUM RATINGS (Voltages referenced to GND) V+ ...........................................................................-0.3V to +44V V- ............................................................................-44V to +0.3V V+ to V-...................................................................-0.3V to +44V COM_, IN_ (Note 1) ..............................(V- - 0.3V) to (V+ + 0.3V) NC_, NO_ (Note 2) MAX4631_ _E .....................................(V+ - 36V) to (V- + 36V) MAX4632_ _E .....................................(V+ - 25V) to (V- + 25V) MAX4633_ _E .....................................(V+ - 36V) to (V- + 36V) NC_, NO_ to COM_ MAX4631_ _E ......................................................-36V to +36V MAX4632_ _E ......................................................-25V to +25V MAX4633_ _E ......................................................-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 = +70°C) (Note 2) Plastic DIP (derate 10.53mW/°C above +70°C) ..........842mW Narrow SO (derate 8.70mW/°C above +70°C) ............696mW CERDIP (derate 10.00mW/°C above +70°C) ...............842mW Operating Temperature Ranges MAX463_C_E ......................................................0°C to +70°C MAX463_E_E ...................................................-40°C to +85°C MAX463_M_E ................................................-55°C to +125°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10sec) .............................+300°C Note 1: COM_ and IN_ pins are not fault protected. Signals on COM_ to 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 (see Electrical Characteristics). With power applied to V+ or V-, signals on NC_ or NO_ exceeding ±25V (MAX4632) or ±36V (MAX4631/MAX4633) may damage the device. With V+ = V- = 0, signals on NC_ or NO_ exceeding ±40V may damage the device. 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, VINL_ = 0.8V, VINH_ = 2.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3) PARAMETER SYMBOL CONDITIONS TA MIN C, E, M V- TYP MAX UNITS V+ V ANALOG SWITCH Fault-Free Analog Signal Range (Note 2) VNO_, VNC_ +25°C COM_ to NO_ or NC_ On-Resistance COM_ to NO_ or NC_ On-Resistance Match Between Channels (Note 4) NO_, NC_, COM_ Off-Leakage Current (Note 5) COM_ On-Leakage Current (Note 5) RON VCOM_ = ±10V, ICOM_ = 1mA 62 100 M 200 +25°C ∆RON VCOM_ = ±10V, ICOM_ = 1mA 85 C, E 3 6 C, E 10 M 15 +25°C -0.5 C, E -5 5 M -100 100 +25°C -0.5 C, E -20 20 M -100 100 MAX4631/ MAX4633 C, E, M -36 36 MAX4632 C, E, M -25 25 C, E, M -40 40 INO_ (OFF), INC_ (OFF), ICOM_(OFF) VCOM_ = ±14V, VNO_ or VNC_ = − +14V ICOM_(ON) VCOM_ = ±14V, VNO_ or VNC_ = ±14V or floating 0.01 0.01 Ω Ω 0.5 nA 0.5 nA FAULT PROTECTION Fault-Protected Analog Signal Range (Note 2) VNO_, VNC_ Applies with power on Applies with power off 2 _______________________________________________________________________________________ V Fault-Protected, High-Voltage, Dual Analog Switches (V+ = +15V, V- = -15V, VINL_ = 0.8V, VINH_ = 2.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3) PARAMETER COM_ Output Leakage Current, Supplies On NO_ or NC_ Input Leakage Current, Supplies On NO_ or NC_ Input Leakage Current, Supplies Off SYMBOL ICOM_ INO_, INC_ INO_, INC_ COM_ Output Clamp Current, Supplies On ICOM_ COM_ Output Clamp Resistance, Supplies On RCOM_ CONDITIONS TA MIN VNO_ or VNC_ = ±25V, no connection to “on” channel (MAX4632 only) +25°C -10 10 C, E -200 200 VNO_ or VNC_ = ±25V, VCOM_ = ±10V TYP MAX M -1 1 +25°C -20 20 C, E -200 200 M -10 10 +25°C -20 20 VNO_ or VNC_ = ±40V, C, E -200 200 M -10 VNO_ or VNC_ = +25V +25°C 13 18 24 VNO_ or VNC_ = -25V +25°C -24 -18 13 VNO_ or VNC_ = ±25V +25°C 0.5 1 10 UNITS nA µA nA µA nA µA mA kΩ LOGIC INPUT IN_ Input Logic Voltage High VINH_ C, E, M IN_ Input Logic Voltage Low VINL_ C, E, M IN_ Input Current Logic High or Low IINH_, IINL_ VIN_ = 0.8V or 2.4V 2.4 V 0.8 +25°C -1 C, E, M -5 0.03 1 5 V µA SWITCH DYNAMIC CHARACTERISTICS +25°C Turn-On Time tON VCOM_ = ±10V, RL = 1kΩ, Figure 2 100 C, E, 500 M 600 +25°C Turn-Off Time tOFF Break-Before-Make Time Delay (MAX4632 only) Charge Injection (Note 6) VCOM_ = ±10V, RL = 1kΩ, Figure 2 150 50 100 C, E, 400 M 500 tBBM VCOM_ = ±10V, RL = 1kΩ, Figure 3 +25°C Q CL = 100pF, Figure 4, NO_ = NC_ = GND, RS = 0 +25°C 5 10 ns 40 ns ns 10 pC NO_, NC_ Off- Capacitance CNC_(OFF), CNO_(OFF) NO_ = NC_ = GND, f = 1MHz, Figure 5 C, E, M 18 pF COM_ Off-Capacitance CCOM_(OFF) COM_ = GND, f = 1MHz, Figure 5 C, E, M 18 pF COM_ On-Capacitance CCOM_(ON) COM_ = NO_ = NC_ = GND, f = 1MHz, Figure 5 C, E, M 22 pF _______________________________________________________________________________________ 3 MAX4631/MAX4632/MAX4633 ELECTRICAL CHARACTERISTICS—Dual Supplies (continued) MAX4631/MAX4632/MAX4633 Fault-Protected, High-Voltage, Dual Analog Switches ELECTRICAL CHARACTERISTICS—Dual Supplies (continued) (V+ = +15V, V- = -15V, VINL_ = 0.8V, VINH_ = 2.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3) PARAMETER SYMBOL CONDITIONS TA MIN TYP MAX UNITS Off-Isolation (Note 7) VISO RL = 50Ω, CL = 15pF, VNO_ = VNC_ = 1VRMS, f = 1MHz, Figure 6 C, E, M -62 dB Channel-to-Channel Crosstalk (Note 8) VCT RL = 50Ω, CL = 15pF, VNO_ = VNC_ = 1VRMS, f = 1MHz, Figure 7 C, E, M -66 dB POWER SUPPLY Power-Supply Range V+, V- C, E, M V+ Supply Current I+ V- Supply Current I- All VIN_ = 0 or 5V, VNO_ or VNC_ = 0 C, E, M All VIN_ = 0 or 15V, VNO_ or VNC_ = 0 C, E, M GND Supply Current IGND All VIN_ = 5V, VNO_ or VNC_ = 0 ±4.5 +25°C All VIN_ = 0 or 5V, VNO_ or VNC_ = 0 C, E, M 325 550 +25°C +25°C ±18 230 130 200 300 -1 0.01 125 C, E, M µA µA 1 10 +25°C V 175 µA 300 ELECTRICAL CHARACTERISTICS—Single Supply (V+ = +15V, V- = -15V, VINL_ = 0.8V, VINH_ = 2.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3) PARAMETER SYMBOL CONDITIONS TA MIN C, E, M 0 TYP MAX UNITS V+ V ANALOG SWITCH Fault-Free Analog Signal Range (Note 2) VNO_, VNC_ +25°C COM_ to NO_ or NC_ On-Resistance COM_ to NO_ or NC_ On-Resistance Match Between Channels (Note 4) RON VCOM_ = 10V, ICOM_ = 1mA 250 M 300 +25°C ∆RON VCOM_ = 10V, ICOM_ = 1mA COM_ On-Leakage Current (Notes 5, 9) 4 C, E VCOM_ = 10V, VNO_ or VNC_ = 12V ICOM_(ON) VCOM_ = 10V, VNO_ or VNC_ = 1V or 12V Ω 10 20 M INO_ (OFF), INC_ (OFF) 200 C, E +25°C NO_, NC_, COM_ Off-Leakage Current (Notes 5, 9) 125 Ω 30 -0.5 0.01 0.5 C, E -10 10 M -200 200 +25°C -0.5 0.01 nA 0.5 C, E -20 20 M -400 400 MAX4631/ MAX4633 C, E, M -36 36 MAX4632 C, E, M -25 25 C, E, M -40 40 nA FAULT PROTECTION Fault-Protected Analog Signal Range (Note 2) VNO_, VNC_ Applies with power on Applies with power off 4 _______________________________________________________________________________________ V Fault-Protected, High-Voltage, Dual Analog Switches (V+ = +15V, V- = -15V, VINL_ = 0.8V, VINH_ = 2.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3) PARAMETER SYMBOL CONDITIONS TA MIN COM_ Output Leakage Current, Supplies On VNO_ or VNC_ = ±25V, no connection to “on” channel (MAX4632 only) C, E ICOM_ VNO_ or VNC_ = ±25V, VCOM_ = ±10V NO_ or NC_ Input Leakage Current, Supplies On NO_ or NC_ Input Leakage Current, Supplies Off INO_, INC_ INO_, INC_ VNO_ or VNC_ = ±40V MAX UNITS -10 10 nA M -1 1 µA C, E -100 100 nA M -10 10 µA C, E -100 100 nA M -10 10 µA 4 5.5 10 mA 1 2.5 kΩ COM_ Output Clamp Current, Supplies On ICOM_ VNO_ or VNC_ = 25V +25°C COM_ Output Clamp Resistance, Supplies On RCOM_ VNO_ or VNC_ = 25V +25°C TYP 1 LOGIC INPUT IN_ Input Logic Voltage High VINH_ C, E, M IN_ Input Logic Voltage Low VINL_ C, E, M IN_ Input Current Logic High or Low IINH_, IINL_ VIN_ = 0.8V or 2.4V VIN_ = 0.8V or 2.4V 2.4 +25°C -1 C, E, M -5 V 0.03 0.8 V 1 µA 5 µA SWITCH DYNAMIC CHARACTERISTICS +25°C Turn-On Time tON VCOM_ = ±10V, RL = 2kΩ, Figure 2 140 C, E, M tOFF Break-Before-Make Time Delay (MAX4632 only) Charge Injection (Note 6) VCOM_ = ±10V, RL = 2kΩ, Figure 2 100 200 C, E, 250 M 400 tBBM VCOM_ = ±10V, RL = 2kΩ, Figure 3 +25°C Q CL = 100pF, Figure 4, NO_ = NC_ = GND, RS = 0 ns 500 +25°C Turn-Off Time 250 300 5 ns 40 ns +25°C 5 pC NO_, NC_ Off-Capacitance CNC_(OFF), CNO_(OFF) NO_ = NC_ = GND, f = 1MHz, Figure 5 C, E, M 20 pF COM_ Off-Capacitance CCOM_(OFF) COM_ = GND, f = 1MHz, Figure 5 C, E, M 20 pF COM_ On-Capacitance CCOM_(ON) COM_ = NO_ = NC_ = GND, f = 1MHz, Figure 5 C, E, M 25 pF Off-Isolation (Note 7) VISO RL = 50Ω, CL = 15pF, VNO_ = VNC_ = 1VRMS, f = 1MHz, Figure 6 C, E, M -62 dB Channel-to-Channel Crosstalk (Note 8) VCT RL = 50Ω, CL = 15pF, VNO_ = VNC_ = 1VRMS, f = 1MHz, Figure 7 C, E, M -65 dB _______________________________________________________________________________________ 5 MAX4631/MAX4632/MAX4633 ELECTRICAL CHARACTERISTICS—Single Supply (continued) ELECTRICAL CHARACTERISTICS—Single Supply (continued) (V+ = +15V, V- = -15V, VINL_ = 0.8V, VINH_ = 2.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3) PARAMETER SYMBOL CONDITIONS TA MIN C, E, M 0 TYP MAX UNITS 36 V POWER SUPPLY Power-Supply Range V+, V- GND Supply Current +25°C I+ All VIN_ = 0 or 5V, VNO_ or VNC_ = 0 C, E, M IGND All VIN_ = 0 or 5V, VNO_ or VNC_ = 0 C, E, M V+ Supply Current 165 250 µA 400 +25°C 165 250 µA 400 Note 2: NC_ and NO_ pins are fault protected (see Electrical Characteristics). With power applied to V+ or V-, signals on NC_ or NO_ exceeding ±25V (MAX4632) or ±36V (MAX4631/MAX4633) may damage the device. With V+ = V- = 0, signals on NC_ or NO_ exceeding ±40V may damage the device. Note 3: The algebraic convention is used in this data sheet; the most negative value is shown in the minimum column. Note 4: ∆RON = RON(MAX) - RON(MIN). Note 5: Leakage parameters are 100% tested at maximum rated hot temperature and guaranteed by correlation at +25°C. Note 6: Guaranteed by design. Note 7: Off-isolation = 20log10 [VCOM_ / (VNC_ or VNO_)], VCOM_ = output, VNC_ or VNO_ = input to off switch. Note 8: Between any two switches. Note 9: Leakage testing for single-supply operation is guaranteed by testing with dual supplies. Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) 120 100 ON-RESISTANCE (Ω) 140 V+ = +12V V- = -12V V+ = +10V V- = -10V 80 60 40 20 TA = +125°C 80 60 40 TA = +25°C V+ = +15V V- = -15V 20 V+ = +20V V- = -20V 0 0 -20 -15 -10 -5 0 VCOM (V) 6 TA = +85°C 100 5 10 15 20 500 TA = -55°C TA = -40°C V+ = 15V V- = -15V V- = GND 450 V+ = +5V 400 ON-RESISTANCE (Ω) V+ = +5V V- = -5V SWITCH ON-RESISTANCE vs. VCOM (SINGLE SUPPLY) MAX4631-33 toc02 180 160 120 MAX4631-33 toc01 200 ON-RESISTANCE vs. VCOM AND TEMPERATURE (DUAL SUPPLIES) MAX4631-33 toc03 SWITCH ON-RESISTANCE vs. VCOM (DUAL SUPPLIES) ON-RESISTANCE (Ω) MAX4631/MAX4632/MAX4633 Fault-Protected, High-Voltage, Dual Analog Switches 350 300 V+ = +8V V+ = +12V V+ = +15V V+ = +20V V+ = +24V V+ = +30V 250 200 150 100 50 -15 -10 -5 0 VCOM (V) 5 10 15 0 5 10 15 VCOM (V) _______________________________________________________________________________________ 20 25 30 Fault-Protected, High-Voltage, Dual Analog Switches LOGIC-LEVEL THRESHOLD vs. V+ 150 130 110 90 TA = -40°C TA = -55°C 50 2 4 6 8 10 2.0 1.8 1.6 40 20 1.0 5 10 250 15 25 30 35 40 -55 -35 -15 I+ (µA) IGND 8 -10 -20 -30 12 14 0 16 20 10 12 14 450 400 DUAL SUPPLIES V+ = +15V V- = -15V 10 5 SINGLE SUPPLY V+ = +12V -5 250 200 NO_ tON -15 -10 -5 0 VCOM (V) 5 10 15 -80 -110 -120 -100 -120 0.1 450 400 350 100 1000 NO_ tON 250 NC_ tON 200 150 NC_ tON NO_ tOFF 100 100 NO_ tOFF 50 0 6 NC_ tOFF 50 NC_ tOFF 0 0 -10 OFF-LOSS 300 300 150 0 -20 -40 -60 -100 0.01 TIME (ns) TIME (ns) 15 -70 -80 -90 16 350 100 80 60 20 0 ON-PHASE ON/OFF TIME vs. DUAL-SUPPLY VOLTAGE 8 120 40 -50 -60 ON/OFF TIME vs. SINGLE-SUPPLY VOLTAGE 6 MAX4631-33 toc11 25 ON-LOSS 1 10 FREQUENCY (MHz) 4 500 MAX4631-33 toc10 30 85 105 125 VIN (V) 2 VIN (V) CHARGE INJECTION vs. VCOM 65 -40 50 10 45 FREQUENCY RESPONSE SINGLE SUPPLY V+ = +12V V- = GND 150 25 0 0 6 5 TEMPERATURE (°C) 100 100 0 CHARGE INJECTION (pC) 20 DUAL SUPPLIES V+ = +15V V- = -15V 200 I- 4 SINGLE SUPPLY V+ = +12V V- = GND 0 0 12 MAX4631-33 toc07 SUPPLY CURRENT (µA) I+ 2 60 I+ vs. VIN V+ = +15V V- = -15V 0 80 1.2 SUPPLY CURRENT vs. VIN 50 100 V+ (V) 250 150 120 1.4 VCOM (V) 200 140 MAX4631-33 toc12 0 2.2 160 LOSS (dB) 70 2.4 PHASE (DEGREES) 170 2.6 MAX4631-33 toc09 TA = +85°C DUAL SUPPLIES V+ = +15V V- = -15V 180 SUPPLY CURRENT (µA) TA = +25°C 190 200 MAX4631-33 toc08 ON-RESISTANCE (Ω) 210 SINGLE OR DUAL SUPPLY 2.8 SUPPLY CURRENT vs. TEMPERATURE MAX4631-33 toc05 TA = +125°C LOGIC-LEVEL THRESHOLD (V) V+ = +12V 230 3.0 MAX4631-33 toc04 250 MAX4631-33 toc06 ON-RESISTANCE vs. VCOM AND TEMPERATURE (SINGLE SUPPLY) 12 18 24 SUPPLY VOLTAGE (V) 30 36 0 2 4 6 8 10 12 14 16 18 20 SUPPLY VOLTAGE (V) _______________________________________________________________________________________ 7 MAX4631/MAX4632/MAX4633 Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) ON/OFF TIME vs. TEMPERATURE LEAKAGE CURRENT vs. TEMPERATURE 1 0.1 0.01 -55 -35 -15 5 25 45 65 MAX4631-33 toc14 150 130 tON 110 tOFF 90 70 50 -55 -35 -15 85 105 125 5 INPUT OVERVOLTAGE vs. OUTPUT CLAMPING (±15V SUPPLIES) 65 85 105 125 -10 -20 +20 0 -20 VCOM 0 -10 +10 VNO 0 +10 INPUT OVERVOLTAGE (V) +10 VCOM 45 FAULT-FREE SIGNAL (±15V SUPPLIES) MAX4631-33 toc15 +20 INPUT OVERVOLTAGE (V) 25 TEMPERATURE (°C) TEMPERATURE (°C) MAX4631-33 toc16 10 ICOM (OFF) AT VNO = +14V, VCOM = -14V ICOM (ON) AT VCOM = +14V INO (OFF) AT VNO = -14V, VCOM = +14V INO (OFF) AT VNO = +14V, VCOM = -14V ICOM (OFF) AT VNO = -14V, VCOM = +14V TIME (ns) LEAKAGE CURRENT (nA) 100 ICOM (ON) AT VCOM = -14V 170 MAX4631-33 toc13 1000 VNO MAX4631/MAX4632/MAX4633 Fault-Protected, High-Voltage, Dual Analog Switches 0 -10 OUTPUT CLAMPING (20µs/div) OUTPUT CLAMPING (20µs/div) Pin Description PIN 8 NAME MAX4631 MAX4632 MAX4633 1, 8 1, 8 1, 8 COM1, COM2 FUNCTION Analog Switch Common Terminals 16, 9 16, 9 16, 9 NO1, NO2 15, 10 15, 10 15, 10 IN1, IN2 Analog Switch Normally Open Terminals 2–7, 12 2, 7, 12 2, 7, 12 N.C. — 3, 6 3, 6 COM3, COM4 — 4, 5 — NC3, NC4 Analog Switch Normally Closed Terminals — — 4, 5 NO3, NO4 Analog Switch Normally Open Terminals 11 11 11 V+ 13 13 13 GND 14 14 14 V- Logic-Control Digital Inputs No Connection. Not internally connected. Analog Switch Common Terminals Positive Supply Input Ground Negative Supply Input _______________________________________________________________________________________ Fault-Protected, High-Voltage, Dual Analog Switches -15V input voltage sensors. The simplified structure is shown in Figure 1. The parallel N1 and P1 MOSFETs form the switch element. N3 and P3 are sensor elements to sample the input voltage and compare it against the powersupply rails. COMPARATOR N3 N-CHANNEL DRIVER SENSE SWITCH -V (-15V) CLAMP N2 NC_ or INPUT NO_ N1 P1 P3 OUTPUT COM_ CLAMP P2 SENSE SWITCH +V (+15V) +15V +15V P-CHANNEL DRIVER COMPARATOR Figure 1. Simplified Internal Structure _______________Detailed Description The MAX4631/MAX4632/MAX4633 are fault-protected analog switches with special operation and construction. Traditional fault-protected switches are constructed using three series CMOS devices. This combination produces good fault-protection but fairly high on-resistance when the signals are within 3V of each supply rail. These series devices are not capable of handling signals up to the power-supply rails. These devices differ considerably from traditional faultprotection switches, with three 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 ±25V (MAX4632) or ±36V (MAX4631/MAX4633) with power on and ±40V with power off. The MAX4631/MAX4632/MAX4633 have a parallel Nchannel and P-channel MOSFET switch configuration with During normal operation of a conducting channel, N1 and P1 remain on with a typical 62Ω on-resistance between NO_ (or NC_) and COM_. If the input voltage exceeds either supply rail by about 50mV, the parallel combination switches (N1, P1) are forced off through the driver and sensing circuitry. At the same time, the output (COM_) is clamped to the appropriate supply rail by the clamp circuitry (N2, P2). Two clamp circuits limit the output voltage to the supply voltages. Pin Compatibility These switches have identical pinouts to common nonfault-protected CMOS switches (DG401, DG403, DG405). Exercise care in considering them as direct replacements in existing printed circuit boards, since only the NO_ and NC_ pins of each switch are fault protected. Normal Operation Two comparators continuously compare the voltage on the NO_ (or NC_) pin with V+ and V- supply voltages (Figure 1). When the signal on NO_ (or NC_) is between V+ and V-, the switch behaves normally, with FETs N1 and P1 turning on and off in response to NO_ (or NC_) signals. For any voltage between the supply rails, the switch is bidirectional; therefore, COM_ and NO_ (or NC_) are interchangeable. Only NO_ and NC_ can be exposed to overvoltages beyond the supply range and within the specified breakdown limits of the device. Fault Condition The MAX4631/MAX4632/MAX4633 protect devices connected to their outputs (COM_) through their unique fault-protection circuitry. When the input voltage is raised 50mV above either supply rail, the internal sense and comparator circuitry (N3 and N-channel driver or P3 and P-channel driver) disconnect the output (COM_) from the input (Figure 1). If the switch driven above the supply rail has an on state, the clamp circuitry (N2 or P2) connects the output to the appropriate supply rail. Table 1 summarizes the switches’ operation under normal and fault conditions. _______________________________________________________________________________________ 9 MAX4631/MAX4632/MAX4633 -15V MAX4631/MAX4632/MAX4633 Fault-Protected, High-Voltage, Dual Analog Switches Table 1. Switch States in Normal and Fault Conditions POWER SUPPLIES (V+, V-) INPUT RANGE NC_ On Between Rails On Off NC_ On Between Rails Off On NO_ On Between V+ and (+40V - V+) On Off V+ On Between V+ and (+40V - V+) Off On V+ On Between V- and (-40V - V-) On Off V- On Between V+ and (-40V - V-) Off On V- Off Between Rails Off Off Follows the load terminal voltage NO_ OUTPUT Transient Fault Response and Recovery Failure Modes When a fast rising and falling transient on NO_ (or NC_) exceeds V+ or V-, the output (COM_) follows the input (IN_) to the supply rail with only a few nanoseconds of delay. This delay is due to the switch on-resistance and circuit capacitance to ground. However, when the input transient returns to within the supply rails, there is a longer output recovery time delay. For positive and negative faults, the recovery time is typically 2.5µs. These values depend on the COM_ output resistance and capacitance, and are not production tested or guaranteed. The delays are not dependent on the fault amplitude. Higher COM_ output resistance and capacitance increase recovery times. The MAX4631/MAX4632/MAX4633 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. The failure modes may not be obvious, and failure in one switch may or may not affect other switches in the same package. Fault-Protection Voltage and Power Off __________Applications Information Ground There is no connection between the analog signal paths and GND. The analog signal paths consist of an N-channel and a 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. The maximum fault voltage on the NO_ (or NC_) pins is ±40V when the power is off. For the MAX4631/ MAX4633, with ±15V supplies, the highest voltage on NO_ (or NC_) can be +36V, and the lowest voltage on NO (or NC_) can be -36V. For the MAX4632, with ±15V supplies, the highest voltage on NO_ (or NC_) can be +25V, and the lowest voltage on NO_ (or NC_) can be -25V. Exceeding these limits can damage the device. 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 analog switch gates. This drive signal is the only connection between the power supplies and the analog signals. GND, IN_, and COM_ have ESD-protection diodes to V+ and V-. IN_ Logic-Level Thresholds When the logic signals are driven rail-to-rail from 0 to +12V or -15V to +15V, the supply current reduces to approximately half of the supply current when the logic input levels are at 0 to +5V. The logic-level thresholds are TTL/CMOS compatible when V+ is +15V. Raising V+ increases the threshold slightly; when V+ reaches +25V, the level threshold is about 2.8V—higher than the TTL output high-level 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. 10 Supply-Current Reduction Power Supplies The MAX4631/MAX4632/MAX4633 operate with bipolar supplies between ±4.5V and ±18V. The V+ and V- supplies need not be symmetrical, but their difference can not exceed the absolute maximum rating of +44V. These devices operate from a single supply between +9V and +36V when V- is connected to GND. ______________________________________________________________________________________ Fault-Protected, High-Voltage, Dual Analog Switches attenuation. At 10MHz, off-isolation is about -46dB in 50Ω systems, declining (approximately 20dB per decade) as frequency increases. Higher circuit impedance also diminishes off-isolation. Adjacent channel attenuation is about 3dB above that of a bare IC socket and is due entirely to capacitive coupling. Test Circuits/Timing Diagrams V+ V+ V+ NO_ OR NC_ VIN_ +10V 50% 50% 0V VIN_ IN_ MAX4631 MAX4632 MAX4633 COM_ GND 50Ω V- +10V 90% 90% VOUT RL VOUT 10pF 0V V- tON tOFF V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION. Figure 2. Switch Turn-On/Turn-Off Times V+ VIN_ VIN_ V+ 50Ω IN_ NO_ IN_ NC_ +10V 50% 0V VNO_, VNC_ MAX4631 COM_ 80% VOUT COM_ GND tR < 5ns tF < 5ns 50% V+ VRL V- 10pF VOUT 0V tOPEN V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION. Figure 3. MAX4631 Break-Before-Make Interval ______________________________________________________________________________________ 11 MAX4631/MAX4632/MAX4633 High-Frequency Performance In 50Ω systems, signal response is reasonably flat up to 30MHz (see Typical Operating Characteristics ). Above 30MHz, the on-response has several minor peaks that are highly layout dependent. The problem with high-frequency operation is not turning the switch on, but turning it off. The off-state switch acts like a capacitor and passes higher frequencies with less MAX4631/MAX4632/MAX4633 Fault-Protected, High-Voltage, Dual Analog Switches Test Circuits/Timing Diagrams (continued) V+ VIN_ V+ V+ IN_ 50Ω NO_ OR NC_ VIN_ 0V MAX4631 MAX4632 MAX4633 VOUT COM_ GND ∆ VOUT VOUT CL 100pF V- V- ∆ VOUT IS THE MEASURED VOLTAGE DUE TO CHARGETRANSFER ERROR Q WHEN THE CHANNEL TURNS OFF. Q = ∆ VOUT • CL V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION. Figure 4. Charge Injection V+ V+ NO_ V+ ADDRESS SELECT IN_ MAX4631 MAX4632 MAX4633 GND NC_ COM_ 1MHz CAPACITANCE ANALYZER V- VV- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION. Figure 5. COM_, NO_, and NC_ Capacitance 12 ______________________________________________________________________________________ Fault-Protected, High-Voltage, Dual Analog Switches V+ 10nF NETWORK ANALYZER V+ 50Ω VIN 50Ω COM_ ADDRESS SELECT MAX4631 MAX4632 MAX4633 IN_ VOUT NO_, NC_ MEAS. V- GND OFF-ISOLATION = 20 log VOUT VIN ON-LOSS = 20 log VOUT VIN REF. 50Ω 50Ω 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. SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED. V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION. Figure 6. Frequency Response and Off-Isolation V+ 10nF NETWORK ANALYZER 50Ω VIN COM_ VOUT NO_, NC_ COM_ 50Ω MEAS. REF. 50Ω MAX4631 MAX4632 MAX4633 2.4V 50Ω NO_, NC_ 50Ω 2.4V IN1 IN2 CROSSTALK = 20 log VOUT VIN V- GND 10nF VV- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION. Figure 7. Crosstalk ______________________________________________________________________________________ 13 MAX4631/MAX4632/MAX4633 Test Circuits/Timing Diagrams (continued) Fault-Protected, High-Voltage, Dual Analog Switches MAX4631/MAX4632/MAX4633 Pin Configurations/Functional Diagrams/Truth Tables TOP VIEW COM1 1 16 NO1 COM1 1 N.C. 2 N.C. 2 15 IN1 N.C. 3 14 V- N.C. 4 13 GND NC3 4 12 N.C. NC4 5 N.C. 5 MAX4631 N.C. 6 11 V+ N.C. 7 10 IN2 COM2 8 9 NO2 14 V- COM1 1 16 NO1 N.C. 2 15 IN1 COM3 3 14 V- 13 GND NO3 4 13 GND MAX4632 12 N.C. NO4 5 MAX4633 12 N.C. COM4 6 11 V+ N.C. 7 10 IN2 COM2 8 9 NO2 COM4 6 11 V+ N.C. 7 10 IN2 COM2 8 9 DIP/SO MAX4631 LOGIC SWITCH 1 15 IN1 COM3 3 DIP/SO 0 16 NO1 OFF ON LOGIC 0 1 DIP/SO MAX4632 SWITCHES 1, 2 SWITCHES 3, 4 OFF ON NO2 MAX4633 LOGIC SWITCH ON OFF SWITCHES SHOWN FOR LOGIC "0" INPUT 0 1 OFF ON N.C. = NOT INTERNALLY CONNECTED Chip Information TRANSISTOR COUNT: 223 14 ______________________________________________________________________________________ Fault-Protected, High-Voltage, Dual Analog Switches SOICN.EPS ______________________________________________________________________________________ 15 MAX4631/MAX4632/MAX4633 Package Information Fault-Protected, High-Voltage, Dual Analog Switches PDIPN.EPS MAX4631/MAX4632/MAX4633 Package Information (continued) 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. 16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.