CD74HC238NS

Overview

The CD74HC238NS is a Texas Instruments logic component belonging to the HC series, functioning as a 3-to-8 line decoder and demultiplexer. It features three binary address inputs (A0, A1, A2) and eight active-low outputs. The device includes two active-low enable inputs (E1, E2) and one active-high enable input (E3) for cascading control. It operates on a single power supply ranging from 2V to 6V and supports surface-mount installation in a 16-pin SOIC package.

Feature Summary

• Provides decoding of three binary address lines into eight distinct active-low output channels
• Includes dual active-low and single active-high enable pins to facilitate multi-device cascading configurations
• Delivers high-speed CMOS performance with low power consumption characteristics comparable to Low-Power Schottky TTL

Applications

• Memory address decoding in digital systems
• Data routing and distribution networks
• Control signal generation for peripheral devices

Procurement Notes

Verify the specific suffix 'NS' against official manufacturer documentation to confirm exact packaging and tape-and-reel specifications. Ensure compatibility with standard SOIC-16 footprints during PCB layout. Confirm RoHS compliance status through current datasheets before finalizing procurement orders.

Selection Notes

Select this component when active-low outputs are required for decoding applications. The HC series offers speed similar to LS-TTL but with lower power dissipation. Verify that the system voltage falls within the 2V to 6V range and that the load requirements do not exceed the specified drive capabilities for reliable operation.

Part Context

This part belongs to the CD74HC238 family, which shares functional similarities with the SN74HC238 and CD74HC138. While the HC138 provides active-high outputs, the HC238 variant specifically delivers active-low outputs. Both share identical pinouts and enable logic structures, differing primarily in output polarity.

Replacement Considerations

• CD74HC238M
• SN74HC238N