SN74ALS253D

Overview

The SN74ALS253D is a dual 4-input multiplexer from the Texas Instruments SN74ALS series, housed in a 16-pin SOIC package. It operates within a supply voltage range of 4.5 V to 5.5 V and supports data rates with a propagation delay of approximately 14 ns. The device features two independent multiplexing circuits, each selecting one of four data inputs based on three address lines. It provides standard TTL-compatible logic levels and is designed for surface-mount installation.

Feature Summary

• Dual independent 4-to-1 multiplexing functionality
• Three-bit binary address selection capability
• Surface-mount compatible SOIC packaging

Applications

• Data routing in digital communication systems
• Address decoding in microprocessor interfaces
• Signal selection in test and measurement equipment

Procurement Notes

Verify the specific suffix 'D' confirms the SOIC-16 package type and tape-and-reel or tube availability as per the manufacturer's current datasheet. Confirm RoHS compliance status and check for any recent product change notifications that may affect pinout or electrical characteristics before finalizing procurement specifications.

Selection Notes

Select this component when dual independent 4-channel multiplexing is required in space-constrained designs. The ALS series offers faster switching speeds compared to standard LS logic while maintaining lower power consumption than older HCT variants. Ensure the operating environment stays within the specified temperature range and voltage limits for reliable performance.

Part Context

This part belongs to the SN74ALS family of advanced low-power Schottky logic devices. These components are widely used in high-speed digital applications where moderate power dissipation and improved speed are critical. The SN74ALS253 specifically addresses needs for multi-path signal selection in complex digital architectures.

Replacement Considerations

Compatible substitutes include the SN74ALS253DR (same function, different reel packaging) and other SN74ALS25x variants if single-channel operation suffices. Verify pin compatibility and electrical parameters against the original design requirements before substitution.