CD74HCT238M

Overview

The CD74HCT238M is a high-speed CMOS logic device manufactured by Texas Instruments, functioning as a 3-to-8 line decoder and demultiplexer. It features three binary address inputs (A0, A1, A2) that select one of eight outputs. The device includes two active-low enable inputs (E1, E2) and one active-high enable input (E3), facilitating cascading capabilities. It operates within a supply voltage range of 2V to 6V and supports an operating temperature range from -55°C to +125°C. Packaged in a 16-pin SOIC format, it combines low power consumption with speed comparable to low-power Schottky TTL.

Feature Summary

• Provides decoding and demultiplexing functions for digital signal routing
• Features mixed polarity enables for flexible system integration
• Supports wide industrial temperature ranges for harsh environments

Applications

• Memory address decoding systems
• Data routing circuits
• Industrial control logic interfaces

Procurement Notes

Verify the specific suffix 'M' corresponds to the standard SOIC package configuration. Confirm RoHS compliance status through official manufacturer documentation or authorized distributors. Ensure the ordering part number matches the exact logic family requirements for your design.

Selection Notes

Select this component when a 3-to-8 decoder with mixed enable polarities is required. It is suitable for applications needing compatibility with both CMOS and TTL logic levels due to its HCT series characteristics. Consider the 16-pin SOIC package constraints for PCB layout.

Part Context

This device belongs to the CD74HC(T)238 family of high-speed CMOS logic decoders. It shares functional similarities with the CD74HC138 but provides non-inverting outputs instead of inverting ones. The HCT designation indicates compatibility with standard TTL input voltages while maintaining CMOS output drive capabilities.

Replacement Considerations

CD74HC238M

FAQ

What is the difference between the HC and HCT versions?

The HCT version is designed to be compatible with standard TTL input voltages, whereas the HC version requires CMOS-compatible input levels.

How many enable inputs does the CD74HCT238M have?

It has three enable inputs: two active-low (E1, E2) and one active-high (E3).