SN74LS156NE4

Overview

The SN74LS156NE4 is a dual 2-line to 4-line decoder/demultiplexer manufactured by Texas Instruments. It features open-collector outputs and individual strobes for each section, allowing independent activation or inhibition of the two 4-bit sections. The device utilizes common binary-address inputs to sequentially select and route associated input data to the appropriate output. Data applied to input C1 is inverted at its outputs, while data applied at C2 passes through true. Input clamping diodes are provided to minimize transmission-line effects.

Feature Summary

• Dual 2-to-4-line decoder and demultiplexer functionality within a single package
• Open-collector outputs suitable for wired-OR applications
• Individual strobes allow selective activation or inhibition of each section
• Input clamping diodes simplify system design and minimize transmission-line effects

Applications

• Dual 2-to-4-line decoding
• Dual 1-to-4-line demultiplexing
• 3-to-8-line decoding configurations
• 1-to-8-line demultiplexing configurations

Procurement Notes

Verify that the ordering suffix 'E4' corresponds to the specific lead finish and RoHS compliance status documented in the TI Package Option Addendum. Confirm the PDIP (N) package type and 16-pin configuration match your board layout requirements. Ensure the operating temperature range of 0°C to 70°C aligns with your application environment before procurement.

Selection Notes

Select this component when open-collector outputs are required for the decoding or demultiplexing function. The LS logic family offers standard TTL compatibility. Consider the individual strobe feature if independent control over the two decoder sections is necessary. Verify that the 16-pin PDIP package fits the available PCB space and assembly process capabilities.

Part Context

This part belongs to the SN74LS156 family of dual 2-line to 4-line decoders/demultiplexers. It is distinct from the SN74LS155, which features totem-pole outputs instead of open-collector outputs. Both devices share similar pinouts and logical functions but differ in output stage characteristics, affecting their suitability for specific load and wiring requirements.

Replacement Considerations

SN74LS156N is the direct equivalent without the E4 suffix. SN74LS155A provides identical logical functionality but uses totem-pole outputs instead of open-collector outputs.