CD74HCT237E

Overview

The CD74HCT237E is a high-speed CMOS logic device manufactured by Texas Instruments, belonging to the 74HCT series. It functions as a 3-to-8 line decoder/demultiplexer with address latches. The component features three binary selection inputs (A0, A1, and 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 (OE1 and OE0) to facilitate cascading and demultiplexing operations. The selected output state is high, distinguishing it from the low-active outputs of the CD74HC137 variant. It operates within a supply voltage range of 4.5 V to 5.5 V and supports through-hole mounting in a standard 16-pin DIP package.

Feature Summary

• Integrates address latching capability via an active-high latch enable signal to maintain stable outputs during input transitions.
• Provides dual output enable inputs to simplify circuit cascading and support flexible data routing configurations.
• Delivers high-speed performance comparable to Low-Power Schottky TTL while maintaining typical CMOS low-power characteristics.

Applications

• Memory address decoding systems requiring stable address latching.
• Data routing applications utilizing demultiplexer functionality.
• Cascaded logic circuits requiring multiple output enable controls.

Procurement Notes

Verify the specific suffix 'E' confirms the PDIP-16 through-hole package configuration. Confirm the HCT technology designation ensures compatibility with standard TTL logic levels. Check for RoHS compliance status if environmental regulations apply to the assembly process. Ensure the datasheet revision matches the required timing specifications for the target application speed.

Selection Notes

Select this component when a 3-to-8 decoder with address latching is required. Choose the HCT series over HC for direct compatibility with TTL logic levels without additional interface circuitry. Consider the CD74HC137 if active-low outputs are preferred instead of active-high. Verify that the 16-pin DIP package fits the available board space and manufacturing constraints.

Part Context

This part belongs to the Texas Instruments 74HCT family of high-speed CMOS logic devices. It shares functional similarities with the CD74HC137 but differs in output polarity and technology node. The HCT series bridges the gap between CMOS power efficiency and TTL noise immunity, making it suitable for mixed-logic environments where standard HC devices might require level shifting.

Replacement Considerations

• CD74HC137