CD74HC237E

Overview

The CD74HC237E is a high-speed silicon-gate CMOS logic device manufactured by Harris Corporation. It functions as an 8-line decoder/demultiplexer with address latches, housed in a 16-pin DIP package. The circuit features three binary address inputs (A0, A1, A2) that can be latched via an active-high latch enable (LE) signal to isolate output changes from input variations. It includes two output enable inputs (OE(1) and OE(0)) to facilitate cascading and demultiplexing operations. The selected output is active-high, distinguishing it from the CD74HC137 series.

Feature Summary

• Incorporates address latching capability controlled by an active-high latch enable signal to maintain stable outputs during input transitions.
• Provides dual output enable inputs to simplify cascading configurations and support demultiplexing applications.
• Delivers active-high decoded outputs for direct interfacing with high-active logic systems.

Applications

• Memory address decoding
• Data routing
• Demultiplexing

Procurement Notes

Verify the manufacturer designation on the component marking against official Harris Corporation documentation to confirm authenticity. Ensure the part number suffix matches the specific package type and temperature rating required for the application environment. Cross-reference the datasheet revision to confirm pinout compatibility and electrical characteristics align with system design specifications before procurement.

Selection Notes

Select this component when an 8-line decoder with address latching functionality is required. The HC series offers low power consumption comparable to standard CMOS while providing speeds similar to Low-Power Schottky TTL. Consider the CD74HCT237 if TTL-compatible input voltage levels are necessary instead of standard CMOS levels.

Part Context

The CD74HC237 belongs to the family of high-speed CMOS logic devices including the CD74HC137 and CD74HCT237. While the CD74HC137 provides active-low outputs, the CD74HC237 provides active-high outputs. Both share similar latching and enable features but differ in output polarity, allowing designers to choose based on the logic requirements of the downstream components.

Replacement Considerations

• CD74HCT237