SN74ALS138ANE4

Signal Switches, Multiplexers, Decoders Overview

The SN74ALS138ANE4 is a 3-line to 8-line decoder/demultiplexer from the Texas Instruments ALS logic family. It features three binary-select inputs (A, B, C) and three enable inputs (G1, G2A, G2B). The device provides eight active-low outputs (Y0–Y7). Recommended operating conditions specify a supply voltage range of 4.5 V to 5.5 V. Propagation delay times are specified between 6 ns and 22 ns depending on input-to-output path. The component operates within an ambient temperature range of 0 °C to 70 °C.

Signal Switches, Multiplexers, Decoders Feature Summary

• Incorporates Schottky-clamped circuitry for high-speed performance
• Features two active-low and one active-high enable inputs to simplify cascading
• Designed specifically for high-performance memory decoding applications

Signal Switches, Multiplexers, Decoders Applications

• High-speed memory decoding systems
• Data transmission routing
• System expansion requiring minimal external gates

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify that the ordering suffix 'E4' corresponds to the specific package variant required, as datasheet documentation lists standard part numbers without this suffix. Confirm RoHS compliance status and lead finish specifications directly with the manufacturer or authorized distributors prior to procurement.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when low propagation delay and high fan-out capabilities are required in 5-V logic environments. Ensure the application operates within the commercial temperature limits and utilizes the appropriate 16-pin plastic DIP package configuration.

Signal Switches, Multiplexers, Decoders Part Context

This device belongs to the SN74ALS138A series, which includes variants such as SN74ALS138AN and SN74ALS138ADR. These parts share identical logical functionality but differ in packaging options including SOIC and SOP formats. The E4 suffix typically indicates environmental compliance attributes rather than functional changes.

Signal Switches, Multiplexers, Decoders Replacement Considerations

SN74ALS138AN

Signal Switches, Multiplexers, Decoders FAQ

What is the function of the enable inputs?

The device uses two active-low (G2A, G2B) and one active-high (G1) enable inputs to control output activation, allowing for system expansion without external inverters.

How does the device handle demultiplexing?

An enable input can be utilized as a data input for demultiplexing applications while the binary-select inputs determine the active output line.