FEATURES

• Fault and Overvoltage Protection

• All Channels Off When Power Off

• Latchup-Proof

• Fast Switching - tA: 200 ns

• Break-Before-Make Switching

• Low On-Resistance: 180 W

• Low Power Consumption: 3 mW

• TTL and CMOS Compatible Inputs

BENEFITS

• Improved Ruggedness

• Power Loss Protection

• Prevents Adjacent Channel Crosstalk

• Standard Logic Interface

• Superior Accuracy

• Fast Settling Time

APPLICATIONS

• Data Acquisition Systems

• Industrial Process Control Systems

• Avionics Test Equipment

• High-Rel Control Systems

• Telemetry

DESCRIPTION

The DG458 and DG459 are 8-channel single-ended and

4-channel differential analog multiplexers, respectively,

incorporating fault protection. A series n-p-n MOSFET

structure provides device and signal-source protection in the

event of power loss or overvoltages. Under fault conditions

the multiplexer input (or output) appears as an open circuit

and only a few nanoamperes of leakage current will flow.

This protects not only the multiplexer and the circuitry

following it, but also protects the sensors or signal sources

which drive the multiplexer.

The DG458 and DG459 can withstand continuous

overvoltage inputs up to ± 35 V. All digital inputs have TTL

compatible logic thresholds. Break-before-make operation

prevents channel-to-channel interference.

The DG458 and DG459 are improved pin-compatible

replacements for HI-508A/509A and MAX358/359

multiplexers.