DM74AS157M

Overview

The DM74AS157M is a quad 2-line to 1-line data selector/multiplexer manufactured by Fairchild Semiconductor, part of the 74AS series. It features buffered inputs and outputs with a separate strobe input for data selection. The device operates on a single power supply ranging from 4.5V to 5.5V. It provides true data output and includes inverters and drivers for full on-chip data selection to four output gates. The component is housed in a 16-SOIC package.

Feature Summary

• Contains four independent multiplexers selecting between two sources
• Features buffered inputs and outputs for signal integrity
• Includes a separate strobe input for data routing control

Applications

• Data selection in digital logic circuits
• Routing 4-bit words from one of two sources to outputs
• Expanding data input points in system designs

Procurement Notes

Verify the obsolete status of this component before procurement planning. Confirm availability through authorized distributors or alternative suppliers offering direct substitutes. Ensure that any replacement parts meet the required electrical specifications and pin compatibility for your specific application design.

Selection Notes

Select this component for applications requiring high-speed data selection within the AS TTL family. Consider the 16-SOIC package constraints and the 4.5V to 5.5V operating voltage range. Evaluate the need for buffered I/O and separate strobe functionality when designing the circuit architecture.

Part Context

This component belongs to the Fairchild DM74AS series, which utilizes an advanced oxide-isolated, ion-implanted Schottky TTL process. This technology offers improved switching performance with reduced power dissipation compared to standard Schottky counterparts. The series is designed for memory, microprocessor, and communication systems requiring fast data handling.

Replacement Considerations

Direct substitute: SN74AS157D (Texas Instruments). Parameter equivalent: SN74AS298AD (Texas Instruments).