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General Description

The MAX378 8-channel single-ended (1-of-8) multiplexer and the MAX379 4-channel differential (2-of-8) multiplexer use a series N-channel/P-channel/N-channel structure to provide significant fault protection. If the power supplies to the MAX378/MAX379 are inadvertently turned off while input voltages are still applied, all channels in the muxes are turned off, and only a few nanoamperes of leakage current will flow into the inputs. This protects not only the MAX378/MAX379 and the circuitry they drive, but also the sensors or signal sources that drive the muxes.

Features

? Fault Input Voltage ±75V with Power Supplies Off

? Fault Input Voltage ±60V with ±15V Power Supplies

? All Switches Off with Power Supplies Off

? On Channel Turns OFF if Overvoltage Occurs on Input or Output

? Only Nanoamperes of Input Current Under All Fault Conditions

? No Increase in Supply Currents Due to Fault Conditions

? Latchup-Proof Construction

? Operates from ±4.5V to ±18V Supplies

? All Digital Inputs are TTL and CMOS Compatible

? Low-Power Monolithic CMOS Design

Applications

Data Acquisition Systems

Industrial and Process Control Systems

Avionics Test Equipment

Signal Routing Between Systems