SN74AS157DRG4

Overview

The SN74AS157DRG4 is a quadruple 2-line to 1-line data selector/multiplexer manufactured by Texas Instruments. It belongs to the AS logic series, utilizing Advanced Schottky technology for high-speed performance. The device features four independent multiplexers, each selecting one of two data inputs based on an enable signal. Packaged in a 16-pin SOIC format, it supports surface-mount installation. Key electrical characteristics include a propagation delay of 3 ns and output drive capabilities of 8 mA low-level and 400 µA high-level current. It operates within a voltage range of 4.5 V to 5.5 V and functions reliably across temperatures from -40°C to +85°C.

Feature Summary

• Provides four independent 2-to-1 multiplexing channels for parallel data selection
• Utilizes Advanced Schottky (AS) technology to achieve high-speed switching with a 3 ns propagation delay
• Includes an active-low enable input to control data flow across all channels simultaneously

Applications

• High-speed digital data routing systems
• Parallel-to-serial conversion circuits
• Address decoding logic in microprocessor interfaces

Procurement Notes

Verify the specific suffix DRG4 against the manufacturer's official documentation to confirm package type, tape-and-reel specifications, and RoHS compliance status. Ensure the ordering part number matches the exact logic family and pinout requirements for your design. Cross-reference the datasheet revision date to validate technical parameters before finalizing procurement decisions.

Selection Notes

Select this component when system requirements demand fast switching speeds and moderate drive strength in a standard 5V logic environment. The AS series offers superior speed compared to standard HC or HCT families. Consider the 16-pin SOIC package constraints and thermal dissipation needs for dense PCB layouts requiring multiple independent data paths.

Part Context

This component is part of the SN74AS157 family of multiplexers. It serves as a high-performance alternative to slower logic families, designed for applications where timing margins are tight. The device integrates four separate selectors into a single integrated circuit, reducing board space while maintaining signal integrity through advanced Schottky clamping diodes.

Replacement Considerations

Public confirmed substitute part numbers: SN74AS157DRE4.