SN74LS253NS

Overview

The SN74LS253NS is a dual four-input multiplexer manufactured by Texas Instruments, belonging to the SN74LS series of logic integrated circuits. It features two independent multiplexing channels, each capable of selecting one of four data inputs based on three address lines. The device utilizes open-collector outputs and operates within a supply voltage range of 4.75 V to 5.25 V. Designed for surface-mount applications, it is housed in a 16-pin SOIC package and supports an operating temperature range from 0°C to +70°C.

Feature Summary

• Dual-channel architecture providing two independent four-to-one multiplexing functions within a single package
• Open-collector output configuration allowing flexible interfacing with various load types and bus systems
• Three-bit address input mechanism enabling precise selection of specific data channels

Applications

• Data routing in digital communication systems
• Address decoding in microprocessor-based control units
• Signal switching in industrial instrumentation panels

Procurement Notes

Verify that the component suffix 'NS' corresponds to the SOIC-16 surface-mount package variant rather than the PDIP through-hole version. Confirm RoHS compliance status as specifications may vary by manufacturing batch. Ensure the supplier provides official datasheets matching the SN74LS253 designation to avoid confusion with similar multiplexer families.

Selection Notes

Select this component when dual independent multiplexing paths are required without consuming separate packages. The open-collector output structure necessitates external pull-up resistors for proper high-level voltage generation. Consider the LS series propagation delay characteristics against system timing requirements before implementation.

Part Context

This part belongs to the standard 74LS TTL logic family, known for balanced power consumption and speed. The SN74LS253 serves as a functional equivalent to other dual 4:1 multiplexers but distinguishes itself through its specific open-collector output topology. It complements the broader 74-series ecosystem used in legacy and modern digital circuit designs.

Replacement Considerations

SN74LS253DR (Texas Instruments) offers identical electrical performance in a tape-and-reel packaging format suitable for automated assembly processes.