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:
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