SN74LS155ADR

Overview

The SN74LS155ADR is a dual 1-of-4 decoder/demultiplexer from the Texas Instruments 74LS logic family. It integrates two independent decoders sharing common 2-bit address inputs, with separate gated enable controls for each decoder section. The device features Schottky process technology for high-speed operation and includes input clamp diodes to limit high-speed termination effects. It operates within a standard voltage range of 4.75 V to 5.25 V and supports surface-mount packaging in a 16-pin SOIC format.

Feature Summary

• Integrates two independent 1-of-4 decoders with shared address lines
• Utilizes Schottky process technology for enhanced switching speed
• Includes input clamp diodes to manage high-speed signal termination

Applications

• Address decoding in memory systems
• Data demultiplexing applications
• Function generator circuits

Procurement Notes

Verify the specific suffix 'ADR' corresponds to the tape-and-reel packaging variant when sourcing. Confirm RoHS compliance status as manufacturing processes evolve. Ensure the supplier provides official datasheets matching the SN74LS155 specification to validate pinout and electrical characteristics against legacy documentation.

Selection Notes

Select this component when dual independent decoding paths are required within a single package. The shared address input simplifies wiring for parallel decoding tasks. Consider the LS series propagation delays and drive capabilities relative to system timing requirements. Verify that the open-collector or active-low output states align with downstream circuit design needs.

Part Context

This part belongs to the SN54/74LS155 family of dual 2-line to 4-line decoders. It is functionally compatible with similar devices from other manufacturers such as Motorola and Fairchild. The 'ADR' suffix typically denotes a specific reel quantity and package style within the Texas Instruments product line, distinguishing it from through-hole or tube-packaged variants.

Replacement Considerations

Cross-reference with SN74LS155N for through-hole equivalents. Check SN74LS156 if open-collector outputs are required for wired-OR configurations. Verify compatibility with SN74LS139 for alternative dual 2-line to 4-line decoding solutions.