SN74LS155ANSR

Overview

The SN74LS155ANSR is a dual 2-line to 4-line decoder/demultiplexer from Texas Instruments, belonging to the SN74LS logic series. It features a SOIC-16 surface-mount package and operates within a supply voltage range of 4.5 V to 5.5 V. The device supports a maximum propagation delay of 27 ns and functions reliably across an operating temperature range of 0°C to +70°C.

Feature Summary

• Provides two independent 2-to-4 line decoding or demultiplexing circuits in a single package
• Utilizes standard LS-TTL logic levels for compatibility with legacy digital systems
• Offers flexible configuration as either a decoder with active-low outputs or a demultiplexer

Applications

• Address decoding in microprocessor-based memory systems
• Data routing in digital signal processing architectures
• Control logic implementation in industrial automation equipment

Procurement Notes

Verify the specific suffix 'ANSR' confirms the SOIC-16 package and tape-and-reel shipping format. Ensure the design accommodates the 0°C to +70°C commercial temperature range. Confirm that the 5V logic family aligns with existing system voltage requirements before finalizing procurement.

Selection Notes

Select this component when dual independent decoding channels are required within a compact footprint. Consider the 27 ns propagation delay against system timing constraints. Evaluate the SOIC-16 package dimensions for PCB layout compatibility compared to alternative DIP or wider surface-mount options.

Part Context

This part belongs to the SN74LS family, representing Low-power Schottky TTL technology. It serves as a functional equivalent to other industry-standard 2-to-4 decoders, providing reliable switching performance for general-purpose digital logic applications requiring moderate speed and standard voltage operation.

Replacement Considerations

Compatible substitutes include the SN74LS139AN (dual 2-to-4 decoder) or SN74LS139NSR. Verify pinout compatibility and output drive characteristics when transitioning between different decoder families.