SN74AS253AD

Overview

The SN74AS253AD is a dual 1-of-4 data selector/multiplexer with 3-state outputs from Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and features a propagation delay time of 21 ns. The device utilizes a SOIC-Narrow-16 package and contains two independent circuits, each selecting one of four input lines for output. Digital input leakage is specified at a maximum of 5 uA, and it supports an ESD Charged Device Model rating of 0.75 kV.

Feature Summary

• Dual configuration providing two independent 4-to-1 multiplexing functions
• 3-state output capability for bus-oriented systems
• High-speed AS logic series performance

Applications

• Data routing in digital communication systems
• Signal selection in microprocessor-based designs
• Bus switching applications requiring high speed

Procurement Notes

Verify the specific suffix 'AD' indicates the SOIC-16 package variant when sourcing. Confirm RoHS compliance status through official manufacturer documentation or authorized distributors. Ensure the operating temperature range meets system requirements, as industrial variants may differ. Cross-reference datasheet revision dates to ensure compatibility with current design specifications.

Selection Notes

Select this component when dual independent 4:1 multiplexing with 3-state outputs is required. The AS series offers faster propagation delays compared to standard TTL equivalents. Consider the SOIC-16 package constraints for PCB layout. Verify that the 4.5 V to 5.5 V supply voltage aligns with the system power rails before integration.

Part Context

This part belongs to the SN74ASxx logic family, known for advanced Schottky technology. It serves as a functional equivalent to other 74-series multiplexers but with improved speed characteristics. The device is designed for high-performance digital applications where signal integrity and switching speed are critical parameters.

Replacement Considerations

Check for direct pin-compatible alternatives within the same logic family. Verify electrical characteristics such as propagation delay and output drive strength against original requirements.