SN74LS156DR

Overview

The SN74LS156DR is a dual 2-line to 4-line decoder/demultiplexer from the Texas Instruments 74LS series. It features open-collector outputs and individual strobes for each section, allowing independent activation or inhibition of the four-bit sections. The device utilizes common binary-address inputs to sequentially select and route associated input data to the appropriate output. Input clamping diodes are integrated to minimize transmission-line effects and simplify system design. It operates within a supply voltage range of 4.75V to 5.25V and supports surface-mount installation in a 16-SOIC package.

Feature Summary

• Dual 2-to-4-line decoding and demultiplexing capabilities with open-collector outputs
• Individual strobes enable selective activation or inhibition of each section
• Integrated input clamping diodes reduce transmission-line effects

Applications

• Dual 2-to-4-line decoder circuits
• Dual 1-to-4-line demultiplexer systems
• 3-to-8-line decoder configurations
• 1-to-8-line demultiplexer applications

Procurement Notes

Verify the specific manufacturer part number against official Texas Instruments documentation to confirm the SN74LS156DR designation. Ensure compatibility with the required logic family specifications and operating temperature ranges before integration. Cross-reference datasheet details regarding pinout and electrical characteristics to validate suitability for the intended circuit design.

Selection Notes

Select this component when dual independent decoding or demultiplexing functions are required within a single package. The open-collector output configuration allows for wired-OR connections and flexibility in driving various load types. Consider the availability of individual strobes for precise control over data routing and the benefit of integrated input clamping for signal integrity in high-speed digital systems.

Part Context

This device belongs to the standard 74LS (Low-power Schottky) logic family, known for balanced speed and power consumption. It is designed for general-purpose digital logic applications requiring reliable decoding and data distribution. The SOIC package facilitates automated assembly and compact PCB layouts compared to through-hole alternatives.

Replacement Considerations

The DM74LS156 is documented as an equivalent alternative offering identical functional characteristics.