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19-1515; Rev 0; 7/99
Fault-Protected, High-Voltage, Dual Analog Switches
General Description
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(R) 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 85 (max) at +25C and is matched between switches to 6 (max). Off-leakage current is only 0.5nA at +25C and 5nA at +85C. 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. 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.
Features
o Fault Protection 40V with Power Off 36V with 15V Supplies (MAX4631/MAX4633) 25V with 15V Supplies (MAX4632) o Rail-to-Rail Signal Handling o No Power-Supply Sequencing Required o All Switches Off with Power Off o Output Clamped to Appropriate Supply Voltage During Fault Condition; No Transition Glitch o 85 (max) Signal Paths with 15V Supplies o 4.5V to 18V Dual Supplies +9V to +36V Single Supply o Low Power Consumption: <6mW o Pin Compatible with Industry-Standard DG401/DG403/DG405 o TTL- and CMOS-Logic Compatible Inputs with Single +9V to +15V, or 15V Supplies
MAX4631/MAX4632/MAX4633
Ordering Information
PART MAX4631CSE MAX4631CPE MAX4631ESE MAX4631EPE MAX4631MJE MAX4632CSE MAX4632CPE MAX4632ESE MAX4632EPE MAX4632MJE MAX4633CSE MAX4633CPE MAX4633ESE MAX4633EPE MAX4633MJE TEMP. RANGE 0C to +70C 0C to +70C -40C to +85C -40C to +85C -55C to +125C 0C to +70C 0C to +70C -40C to +85C -40C to +85C -55C to +125C 0C to +70C 0C to +70C -40C to +85C -40C to +85C -55C to +125C PIN-PACKAGE 16 Narrow SO 16 Plastic DIP 16 Narrow SO 16 Plastic DIP 16 CERDIP 16 Narrow SO 16 Plastic DIP 16 Narrow SO 16 Plastic DIP 16 CERDIP 16 Narrow SO 16 Plastic DIP 16 Narrow SO 16 Plastic DIP 16 CERDIP
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 is a registered trademark of Nippon Motorola, Ltd.
________________________________________________________________ Maxim Integrated Products
1
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Fault-Protected, High-Voltage, Dual Analog Switches MAX4631/MAX4632/MAX4633
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 = +70C) (Note 2) Plastic DIP (derate 10.53mW/C above +70C) ..........842mW Narrow SO (derate 8.70mW/C above +70C) ............696mW CERDIP (derate 10.00mW/C above +70C) ...............842mW Operating Temperature Ranges MAX463_C_E ......................................................0C to +70C MAX463_E_E ...................................................-40C to +85C MAX463_M_E ................................................-55C to +125C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10sec) .............................+300C
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 = +25C.) (Note 3) PARAMETER ANALOG SWITCH Fault-Free Analog Signal Range (Note 2) 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) VNO_, VNC_ VCOM_ = 10V, ICOM_ = 1mA VCOM_ = 10V, ICOM_ = 1mA VCOM_ = 14V, VNO_ or VNC_ = - +14V VCOM_ = 14V, VNO_ or VNC_ = 14V or floating C, E, M +25C RON C, E M +25C RON INO_ (OFF), INC_ (OFF), ICOM_(OFF) ICOM_(ON) C, E M +25C C, E M +25C C, E M -0.5 -5 -100 -0.5 -20 -100 0.01 0.01 3 V62 V+ 85 100 200 6 10 15 0.5 5 100 0.5 20 100 nA nA V SYMBOL CONDITIONS TA MIN TYP MAX UNITS
COM_ On-Leakage Current (Note 5) FAULT PROTECTION Fault-Protected Analog Signal Range (Note 2)
VNO_, VNC_
Applies with power on
MAX4631/ MAX4633 MAX4632
C, E, M C, E, M C, E, M
-36 -25 -40
36 25 40 V
Applies with power off
2
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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 = +25C.) (Note 3) PARAMETER COM_ Output Leakage Current, Supplies On SYMBOL ICOM_ CONDITIONS VNO_ or VNC_ = 25V, no connection to "on" channel (MAX4632 only) VNO_ or VNC_ = 25V, VCOM_ = 10V TA +25C C, E M +25C NO_ or NC_ Input Leakage Current, Supplies On INO_, INC_ C, E M +25C NO_ or NC_ Input Leakage Current, Supplies Off COM_ Output Clamp Current, Supplies On COM_ Output Clamp Resistance, Supplies On LOGIC INPUT IN_ Input Logic Voltage High IN_ Input Logic Voltage Low IN_ Input Current Logic High or Low VINH_ VINL_ IINH_, IINL_ VIN_ = 0.8V or 2.4V C, E, M C, E, M +25C C, E, M +25C Turn-On Time tON VCOM_ = 10V, RL = 1k, Figure 2 C, E, M +25C Turn-Off Time Break-Before-Make Time Delay (MAX4632 only) Charge Injection (Note 6) NO_, NC_ Off- Capacitance COM_ Off-Capacitance COM_ On-Capacitance tOFF VCOM_ = 10V, RL = 1k, Figure 2 VCOM_ = 10V, RL = 1k, Figure 3 CL = 100pF, Figure 4, NO_ = NC_ = GND, RS = 0 NO_ = NC_ = GND, f = 1MHz, Figure 5 COM_ = GND, f = 1MHz, Figure 5 COM_ = NO_ = NC_ = GND, f = 1MHz, Figure 5 C, E, M tBBM Q CNC_(OFF), CNO_(OFF) CCOM_(OFF) CCOM_(ON) +25C +25C C, E, M C, E, M C, E, M 10 40 5 18 18 22 10 50 -1 -5 100 0.03 2.4 0.8 1 5 150 500 600 100 400 500 ns pC pF pF pF ns ns V V A INO_, INC_ VNO_ or VNC_ = 40V, VNO_ or VNC_ = +25V VNO_ or VNC_ = -25V VNO_ or VNC_ = 25V C, E M ICOM_ RCOM_ +25C +25C +25C MIN -10 -200 -1 -20 -200 -10 -20 -200 -10 13 -24 18 -18 0.5 TYP MAX 10 200 1 20 200 10 20 200 10 24 13 1 UNITS nA A nA A nA A mA k
MAX4631/MAX4632/MAX4633
SWITCH DYNAMIC CHARACTERISTICS
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Fault-Protected, High-Voltage, Dual Analog Switches MAX4631/MAX4632/MAX4633
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 = +25C.) (Note 3) PARAMETER Off-Isolation (Note 7) SYMBOL VISO CONDITIONS RL = 50, CL = 15pF, VNO_ = VNC_ = 1VRMS, f = 1MHz, Figure 6 RL = 50, CL = 15pF, VNO_ = VNC_ = 1VRMS, f = 1MHz, Figure 7 TA C, E, M MIN TYP -62 MAX UNITS dB
Channel-to-Channel Crosstalk (Note 8) POWER SUPPLY Power-Supply Range V+ Supply Current V- Supply Current
VCT
C, E, M
-66
dB
V+, VI+
C, E, M All VIN_ = 0 or 5V, VNO_ or VNC_ = 0 All VIN_ = 0 or 5V, VNO_ or VNC_ = 0 All VIN_ = 0 or 15V, VNO_ or VNC_ = 0 All VIN_ = 5V, VNO_ or VNC_ = 0 +25C C, E, M +25C C, E, M +25C C, E, M +25C C, E, M
4.5 230 130 -1 0.01 125
18 325 550 200 300 1 10 175 300
V A A
I-
GND Supply Current
IGND
A
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 = +25C.) (Note 3) PARAMETER ANALOG SWITCH Fault-Free Analog Signal Range (Note 2) 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 (Notes 5, 9) VNO_, VNC_ VCOM_ = 10V, ICOM_ = 1mA VCOM_ = 10V, ICOM_ = 1mA VCOM_ = 10V, VNO_ or VNC_ = 12V VCOM_ = 10V, VNO_ or VNC_ = 1V or 12V C, E, M +25C RON C, E M +25C RON C, E M +25C INO_ (OFF), INC_ (OFF) C, E M +25C COM_ On-Leakage Current (Notes 5, 9) FAULT PROTECTION Fault-Protected Analog Signal Range (Note 2) Applies with power on MAX4631/ MAX4633 MAX4632 Applies with power off C, E, M C, E, M C, E, M -36 -25 -40 36 25 40 V ICOM_(ON) C, E M -0.5 -10 -200 -0.5 -20 -400 0.01 0.01 4 0 125 V+ 200 250 300 10 20 30 0.5 10 200 0.5 20 400 nA nA V SYMBOL CONDITIONS TA MIN TYP MAX UNITS
VNO_, VNC_
4
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Fault-Protected, High-Voltage, Dual Analog Switches
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 = +25C.) (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 COM_ Output Clamp Current, Supplies On COM_ Output Clamp Resistance, Supplies On LOGIC INPUT IN_ Input Logic Voltage High IN_ Input Logic Voltage Low IN_ Input Current Logic High or Low VINH_ VINL_ IINH_, IINL_ VIN_ = 0.8V or 2.4V VIN_ = 0.8V or 2.4V C, E, M C, E, M +25C C, E, M +25C Turn-On Time tON VCOM_ = 10V, RL = 2k, Figure 2 C, E, M +25C Turn-Off Time Break-Before-Make Time Delay (MAX4632 only) Charge Injection (Note 6) NO_, NC_ Off-Capacitance COM_ Off-Capacitance COM_ On-Capacitance Off-Isolation (Note 7) Channel-to-Channel Crosstalk (Note 8) tOFF VCOM_ = 10V, RL = 2k, Figure 2 VCOM_ = 10V, RL = 2k, Figure 3 CL = 100pF, Figure 4, NO_ = NC_ = GND, RS = 0 NO_ = NC_ = GND, f = 1MHz, Figure 5 COM_ = GND, f = 1MHz, Figure 5 COM_ = NO_ = NC_ = GND, f = 1MHz, Figure 5 RL = 50, CL = 15pF, VNO_ = VNC_ = 1VRMS, f = 1MHz, Figure 6 RL = 50, CL = 15pF, VNO_ = VNC_ = 1VRMS, f = 1MHz, Figure 7 C, E, M tBBM Q CNC_(OFF), CNO_(OFF) CCOM_(OFF) CCOM_(ON) +25C +25C C, E, M C, E, M C, E, M 5 40 5 20 20 25 100 -1 -5 140 0.03 2.4 0.8 1 5 250 300 500 200 250 400 ns pC pF pF pF ns ns V V A A SYMBOL ICOM_ CONDITIONS VNO_ or VNC_ = 25V, no connection to "on" channel (MAX4632 only) VNO_ or VNC_ = 25V, VCOM_ = 10V VNO_ or VNC_ = 40V VNO_ or VNC_ = 25V VNO_ or VNC_ = 25V TA C, E M C, E M C, E M +25C +25C MIN -10 -1 -100 -10 -100 -10 4 5.5 1 1 TYP MAX 10 1 100 10 100 10 10 2.5 UNITS nA A nA A nA A mA k
MAX4631/MAX4632/MAX4633
INO_, INC_ INO_, INC_ ICOM_ RCOM_
SWITCH DYNAMIC CHARACTERISTICS
VISO
C, E, M
-62
dB
VCT
C, E, M
-65
dB
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Fault-Protected, High-Voltage, Dual Analog Switches MAX4631/MAX4632/MAX4633
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 = +25C.) (Note 3) PARAMETER POWER SUPPLY Power-Supply Range V+ Supply Current GND Supply Current V+, VI+
SYMBOL
CONDITIONS
TA C, E, M
MIN 0
TYP
MAX 36
UNITS V A A
All VIN_ = 0 or 5V, VNO_ or VNC_ = 0 All VIN_ = 0 or 5V, VNO_ or VNC_ = 0
+25C C, E, M +25C C, E, M
165 165
250 400 250 400
IGND
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 +25C. 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 = +25C, unless otherwise noted.)
SWITCH ON-RESISTANCE vs. VCOM (DUAL SUPPLIES)
MAX4631-33 toc01
ON-RESISTANCE vs. VCOM AND TEMPERATURE (DUAL SUPPLIES)
MAX4631-33 toc02
180 160 ON-RESISTANCE () 140 120 100 80 60 40 20 0 -20 -15 -10 -5 0 VCOM (V) 5 10 15 V+ = +15V V- = -15V V+ = +20V V- = -20V V+ = +10V V- = -10V V+ = +12V V- = -12V V+ = +5V V- = -5V
100 ON-RESISTANCE () 80 60 40 TA = +25C 20 0
TA = +85C
TA = +125C
450 400 ON-RESISTANCE () 350 300 250 200 150 100 50
V- = GND V+ = +5V
TA = -40C V+ = 15V V- = -15V -15 -10 -5 0 VCOM (V) 5
TA = -55C
V+ = +8V V+ = +12V V+ = +15V V+ = +20V V+ = +24V V+ = +30V
20
10
15
0
5
10
15 VCOM (V)
20
25
30
6
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MAX4631-33 toc03
200
SWITCH ON-RESISTANCE vs. VCOM (SINGLE SUPPLY)
500
120
Fault-Protected, High-Voltage, Dual Analog Switches
Typical Operating Characteristics (continued)
(TA = +25C, unless otherwise noted.)
ON-RESISTANCE vs. VCOM AND TEMPERATURE (SINGLE SUPPLY)
MAX4631-33 toc04
MAX4631/MAX4632/MAX4633
LOGIC-LEVEL THRESHOLD vs. V+
MAX4631-33 toc05
SUPPLY CURRENT vs. TEMPERATURE
180 160 SUPPLY CURRENT (A) 140 120 100 80 60 40 20 0 SINGLE SUPPLY V+ = +12V V- = GND -55 -35 -15 5 25 45 65 85 105 125 DUAL SUPPLIES V+ = +15V V- = -15V
MAX4631-33 toc06 MAX4631-33 toc09
250 230 210 ON-RESISTANCE () 190 170 150 130 110 90 70 50 0 2 4 6 VCOM (V) 8 TA = -40C TA = -55C 10 V+ = +12V TA = +125C TA = +25C TA = +85C
3.0 2.8 LOGIC-LEVEL THRESHOLD (V) 2.6 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 SINGLE OR DUAL SUPPLY
200
12
0
5
10
15
20 V+ (V)
25
30
35
40
TEMPERATURE (C)
SUPPLY CURRENT vs. VIN
MAX4631-33 toc07
I+ vs. VIN
DUAL SUPPLIES V+ = +15V V- = -15V SINGLE SUPPLY V+ = +12V V- = GND
MAX4631-33 toc08
FREQUENCY RESPONSE
0 -10 -20 -30 -40 LOSS (dB) -50 -60 -70 -80 -90 -100 -110 -120 ON-PHASE ON-LOSS 120 100 80 60 40 20 0 -20 -40 -60 -80 -100 -120 0.01 0.1 1 10 FREQUENCY (MHz) 100 1000 PHASE (DEGREES)
250 V+ = +15V V- = -15V 200 SUPPLY CURRENT (A) I+
250
200
I+ (A)
150
I-
150
100 IGND
100
OFF-LOSS
50
50
0 0 2 4 6 8 VIN (V) 10 12 14 16
0 0 2 4 6 8 VIN (V) 10 12 14 16
CHARGE INJECTION vs. VCOM
MAX4631-33 toc10
ON/OFF TIME vs. SINGLE-SUPPLY VOLTAGE
450 400 350 TIME (ns) TIME (ns) 300 250 200 150 NO_ tON NO_ tOFF NC_ tOFF 0 6 12 18 24 30 36 NC_ tON
MAX4631-33 toc11
ON/OFF TIME vs. DUAL-SUPPLY VOLTAGE
400 350 300 250 200 150 100 50 0 0 2 4 6 8 10 12 14 16 18 20 NC_ tOFF NO_ tOFF NO_ tON NC_ tON
MAX4631-33 toc12
30 25 CHARGE INJECTION (pC) 20 15 10 5 0 -5 -10 -15 -10 -5 0 VCOM (V) 5 10 DUAL SUPPLIES V+ = +15V V- = -15V
500
450
SINGLE SUPPLY V+ = +12V
100 50 0
15
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
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Fault-Protected, High-Voltage, Dual Analog Switches MAX4631/MAX4632/MAX4633
Typical Operating Characteristics (continued)
(TA = +25C, unless otherwise noted.)
LEAKAGE CURRENT vs. TEMPERATURE
ICOM (ON) AT VCOM = -14V 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 -55 -35 -15 5 25 45 65 TEMPERATURE (C)
MAX4631-33 toc13
ON/OFF TIME vs. TEMPERATURE
MAX4631-33 toc14
1000
170 150 130 TIME (ns) tON 110 tOFF 90 70 50 -55 -35 -15 5 25 45 65
100 LEAKAGE CURRENT (nA)
10
1
0.1
0.01
85 105 125
85 105 125
TEMPERATURE (C)
INPUT OVERVOLTAGE vs. OUTPUT CLAMPING (15V SUPPLIES)
MAX4631-33 toc15
FAULT-FREE SIGNAL (15V SUPPLIES)
+10 VCOM INPUT OVERVOLTAGE (V) 0 -10
MAX4631-33 toc16
+20 +10 INPUT OVERVOLTAGE (V) VCOM 0 -10 -20 +20 VNO 0
+10 VNO 0 -10
-20 OUTPUT CLAMPING (20s/div)
OUTPUT CLAMPING (20s/div)
Pin Description
PIN MAX4631 1, 8 16, 9 15, 10 2-7, 12 -- -- -- 11 13 14 8 MAX4632 1, 8 16, 9 15, 10 2, 7, 12 3, 6 4, 5 -- 11 13 14 MAX4633 1, 8 16, 9 15, 10 2, 7, 12 3, 6 -- 4, 5 11 13 14 NAME COM1, COM2 NO1, NO2 IN1, IN2 N.C. COM3, COM4 NC3, NC4 NO3, NO4 V+ GND VFUNCTION Analog Switch Common Terminals Analog Switch Normally Open Terminals Logic-Control Digital Inputs No Connection. Not internally connected. Analog Switch Common Terminals Analog Switch Normally Closed Terminals Analog Switch Normally Open Terminals Positive Supply Input Ground Negative Supply Input
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Fault-Protected, High-Voltage, Dual Analog Switches
-15V COMPARATOR
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.
-V (-15V)
MAX4631/MAX4632/MAX4633
-15V
N3 SENSE SWITCH
N-CHANNEL DRIVER
CLAMP N2 N1 OUTPUT COM_ CLAMP P2
NC_ or INPUT NO_ P3 SENSE SWITCH
P1
During normal operation of a conducting channel, N1 and P1 remain on with a typical 62 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.
+V (+15V) +15V P-CHANNEL DRIVER
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.
+15V
COMPARATOR
Figure 1. Simplified Internal Structure
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.
_______________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
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.
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9
Fault-Protected, High-Voltage, Dual Analog Switches MAX4631/MAX4632/MAX4633
Table 1. Switch States in Normal and Fault Conditions
POWER SUPPLIES (V+, V-) On On On On On On Off INPUT RANGE Between Rails Between Rails Between V+ and (+40V - V+) Between V+ and (+40V - V+) Between V- and (-40V - V-) Between V+ and (-40V - V-) Between Rails NC_ On Off On Off On Off Off NO_ Off On Off On Off On Off OUTPUT NC_ NO_ V+ V+ VVFollows the load terminal voltage
Transient Fault Response and Recovery
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 2.5s. 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.
Failure Modes
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.
__________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. 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-.
Fault-Protection Voltage and Power Off
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.
Supply-Current Reduction
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.
IN_ Logic-Level Thresholds
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.
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.
10
______________________________________________________________________________________
Fault-Protected, High-Voltage, Dual Analog Switches
High-Frequency Performance
In 50 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 attenuation. At 10MHz, off-isolation is about -46dB in 50 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.
MAX4631/MAX4632/MAX4633
Test Circuits/Timing Diagrams
V+ V+ NO_ OR NC_ +10V V+ VIN_ 0V 50% 50%
VIN_
IN_
MAX4631 MAX4632 MAX4633 COM_
GND VRL 10pF
+10V VOUT VOUT 0V
90%
90%
50
V-
tOFF
tON
V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
Figure 2. Switch Turn-On/Turn-Off Times
V+ VIN_ IN_ IN_ 50 V+ NO_ NC_ +10V VIN_
V+ 50% 0V VNO_, VNC_ COM_ COM_ VOUT RL V10pF VOUT 0V tOPEN 80%
tR < 5ns tF < 5ns 50%
MAX4631
GND
V-
V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
Figure 3. MAX4631 Break-Before-Make Interval
______________________________________________________________________________________
11
Fault-Protected, High-Voltage, Dual Analog Switches MAX4631/MAX4632/MAX4633
Test Circuits/Timing Diagrams (continued)
V+ VIN_ V+ IN_ NO_ OR NC_ VIN_ 0V V+
50
MAX4631 MAX4632 MAX4633
COM_ GND VCL 100pF VOUT
VOUT
VOUT
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+ V+ NO_
ADDRESS SELECT
IN_
MAX4631 MAX4632 MAX4633
GND
NC_ COM_ V1MHz CAPACITANCE ANALYZER
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
Test Circuits/Timing Diagrams (continued)
V+ 10nF NETWORK ANALYZER V+ COM_ VIN 50 50 OFF-ISOLATION = 20 log ON-LOSS = 20 log VOUT NO_, NC_ GND VMEAS. 50 50 REF. VOUT VIN VOUT VIN
MAX4631/MAX4632/MAX4633
ADDRESS SELECT
IN_
MAX4631 MAX4632 MAX4633
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 50 COM_ NO_, NC_ VIN 50 50
VOUT NO_, NC_ COM_
MEAS. 50 50
REF.
2.4V
MAX4631 MAX4632 MAX4633
IN1 GND VIN2
2.4V
CROSSTALK = 20 log
VOUT VIN
10nF VV- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
Figure 7. Crosstalk
______________________________________________________________________________________ 13
Fault-Protected, High-Voltage, Dual Analog Switches MAX4631/MAX4632/MAX4633
Pin Configurations/Functional Diagrams/Truth Tables
TOP VIEW
COM1 1 N.C. 2 N.C. 3 N.C. 4 N.C. 5 N.C. 6 N.C. 7 COM2 8 16 NO1 15 IN1 14 V13 GND COM1 1 N.C. 2 COM3 3 NC3 4 NC4 5 COM4 6 N.C. 7 COM2 8 16 NO1 15 IN1 14 V13 GND COM1 1 N.C. 2 COM3 3 NO3 4 NO4 5 COM4 6 N.C. 7 COM2 8 16 NO1 15 IN1 14 V13 GND
MAX4631
12 N.C. 11 V+ 10 IN2 9 NO2
MAX4632 12 N.C.
11 V+ 10 IN2 9 NO2
MAX4633 12 N.C.
11 V+ 10 IN2 9 NO2
DIP/SO
MAX4631 LOGIC SWITCH 0 1 OFF ON
DIP/SO
MAX4632 SWITCHES 1, 2 SWITCHES 3, 4 OFF ON ON OFF
DIP/SO
MAX4633 LOGIC SWITCH 0 1 OFF ON
LOGIC 0 1
SWITCHES SHOWN FOR LOGIC "0" INPUT
N.C. = NOT INTERNALLY CONNECTED
Chip Information
TRANSISTOR COUNT: 223
14
______________________________________________________________________________________
Fault-Protected, High-Voltage, Dual Analog Switches
Package Information
SOICN.EPS
MAX4631/MAX4632/MAX4633
______________________________________________________________________________________
15
Fault-Protected, High-Voltage, Dual Analog Switches MAX4631/MAX4632/MAX4633
Package Information (continued)
PDIPN.EPS
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 (c) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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