CD74HCT137E

Overview

The CD74HCT137E 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 and demultiplexer with an address latch. The component features three binary selection 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 active-low output enable inputs (OE1, OE2) to facilitate cascading and demultiplexing operations. The selected output is low-active. It operates within a supply voltage range of 4.5 V to 5.5 V and supports through-hole mounting in a 16-pin PDIP package.

Feature Summary

• Integrates a 3-to-8 line decoder with an address latch for stable decoding
• Supports demultiplexing functionality using output enable inputs as data paths
• Features active-low outputs suitable for memory address decoding applications

Applications

• Memory address decoding systems
• Data routing circuits
• Demultiplexing signal distribution

Procurement Notes

Verify the specific suffix 'E' corresponds to the PDIP-16 through-hole package configuration. Confirm RoHS compliance status and check for any recent product change notifications regarding pinout or electrical characteristics before finalizing procurement specifications.

Selection Notes

Select this component when a decoded output with address latching capability is required in a 5V CMOS system. Ensure the design utilizes active-low output drivers compatible with the CD74HCT137E's logic levels. Verify that the PCB layout accommodates the 16-pin DIP footprint and that the operating temperature range meets the application's environmental requirements.

Part Context

This part belongs to the CD74HCT137 family of high-speed silicon-gate CMOS logic devices. It is functionally related to the CD74HC137 and CD74HCT237, differing primarily in output polarity and HCT compatibility with TTL inputs. The device is designed for low power consumption while maintaining speed comparable to low-power Schottky TTL logic.

Replacement Considerations

Compatible substitutes include CD74HC137E and CD74HCT137E. Note that CD74HC137E may have different input threshold voltages compared to the HCT variant. CD74HCT237E offers the same functionality but with active-high outputs instead of active-low.