SN74LVC138ADR

Overview

The SN74LVC138ADR is a 3-line to 8-line decoder and demultiplexer from Texas Instruments' LVC logic family. It operates within a supply voltage range of 2 V to 3.6 V and features three address inputs and eight active-low outputs. The device includes two active-low enable inputs and one active-high enable input for chip selection control. Packaged in a 16-pin SOIC surface-mount format, it supports a maximum propagation delay of 6.7 ns and functions reliably across an industrial temperature range of -40°C to +125°C.

Feature Summary

• Provides decoding or demultiplexing functionality with three binary address lines controlling eight distinct output channels.
• Incorporates multiple enable pins to manage device activation states, allowing system-level gating of the logic function.
• Utilizes low-voltage CMOS technology to ensure compatibility with modern digital systems while maintaining robust signal integrity.

Applications

• Address decoding in microprocessor-based memory systems
• Demultiplexing data streams in communication interfaces
• Control logic for peripheral device selection

Procurement Notes

Verify the specific suffix 'ADR' corresponds to the 16-pin SOIC package variant when sourcing. Confirm that the component meets the required operating temperature specifications for your application environment. Ensure that the logic family voltage levels align with your system's power supply constraints before integration.

Selection Notes

Select this component when a 3-to-8 decoding function is required within a low-voltage digital design. Consider the LVC series for its balance of speed and power consumption compared to older logic families. Evaluate the SOIC package dimensions against your PCB layout constraints and thermal management requirements.

Part Context

This part belongs to the SN74LVC138A series of decoders and demultiplexers manufactured by Texas Instruments. The LVC series is designed for low-voltage applications, offering performance improvements over standard LVTTL devices. The 'ADR' designation specifically identifies the SOIC package type and tape-and-reel shipping configuration.

Replacement Considerations

Compatible alternatives include the SN74LVC138APWR and SN74LVC138ADBR. Verify pinout compatibility and electrical characteristics before substituting. Ensure that any replacement part maintains the same logic family voltage ranges and package dimensions for direct board integration.