SN74LS155ANS

Overview

The SN74LS155ANS is a dual 2-line to 4-line decoder/demultiplexer manufactured by Texas Instruments. It operates within a supply voltage range of 4.75V to 5.25V and features two independent decoders sharing common 2-bit address inputs. Each decoder includes separate gated enable inputs, with Decoder A utilizing one active HIGH and one active LOW input, while Decoder B employs two active LOW enable inputs. The device provides four active LOW outputs per decoder, selected via the address lines when enable conditions are met. It is housed in a 16-pin SOIC package and supports operation across a temperature range of 0°C to 70°C.

Feature Summary

• Dual decoder architecture with shared address inputs for efficient pin usage
• Independent gating enables allowing flexible control of each decoder section
• Active LOW output states suitable for direct interfacing with logic circuits

Applications

• Address decoding in memory systems
• Data distribution in digital communication paths
• Control signal routing in industrial automation

Procurement Notes

Verify component authenticity through authorized distributors or manufacturer channels. Confirm RoHS compliance status and check for obsolescence notices prior to procurement. Ensure packaging specifications match design requirements. Validate datasheet revisions against current production standards to guarantee functional compatibility.

Selection Notes

Select this component for applications requiring simultaneous decoding of two independent 2-to-4 line functions within a single package. Consider the shared address input constraint when designing system architectures. Evaluate power consumption and switching speed requirements against standard LS TTL specifications. Ensure voltage levels align with the specified 4.75V to 5.25V operating range.

Part Context

This part belongs to the Texas Instruments 74LS series of high-speed Schottky TTL logic devices. The 74LS family is known for improved speed-power product compared to standard TTL. The SN74LS155 specifically addresses needs for compact decoding solutions in legacy and modern digital designs requiring reliable binary-to-decimal translation capabilities.