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.