SN74ALS257AN

Overview

The SN74ALS257AN is a quad 2-to-1 data selector/multiplexer manufactured by Texas Instruments in the ALS logic series. It features four independent multiplexers with three-state outputs, housed in a 16-pin PDIP package. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports through-hole mounting. Key electrical parameters include a propagation delay of 12 ns and an operating temperature range from 0°C to +70°C.

Feature Summary

• Integrates four independent 2-to-1 multiplexers for parallel data selection
• Provides three-state output capability for bus-oriented systems
• Utilizes Advanced Low-power Schottky (ALS) technology for high-speed performance

Applications

• Data routing in digital communication systems
• Address decoding and selection circuits
• Bus switching applications requiring tri-state isolation

Procurement Notes

Verify the specific ordering suffix 'AN' confirms the PDIP-16 package and industrial temperature grade. Confirm RoHS compliance status via the manufacturer's current documentation, as legacy variants may differ. Ensure the procurement channel provides valid traceability for the Texas Instruments brand. Cross-reference the datasheet revision to match design requirements.

Selection Notes

Select this component when four independent 2:1 multiplexing functions are required in a single package. The ALS series offers a balance of speed and power consumption suitable for general-purpose logic applications. The PDIP-16 through-hole package is appropriate for prototyping or standard PCB layouts requiring mechanical robustness compared to surface-mount alternatives.

Part Context

This part belongs to the SN74ALS25xA family of high-speed logic devices. It serves as a functional equivalent to other quad 2:1 multiplexers within the 74xx series ecosystem. The ALS designation indicates the use of Advanced Low-power Schottky technology, distinguishing it from standard TTL or LS logic families in terms of switching speed and power dissipation characteristics.