CD74HCT238E

Overview

The CD74HCT238E is a high-speed CMOS logic device 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). Outputs are available in both inverted and non-inverted configurations. It operates within a supply voltage range of 4.5V to 5.5V and supports an operating temperature range from -55°C to +125°C.

Feature Summary

• Provides simultaneous inverted and non-inverted output signals for each decoded address.
• Includes multiple enable inputs to facilitate cascading and system expansion.
• Compatible with standard TTL logic levels due to HCT series specifications.

Applications

• Memory address decoding in computer systems
• Data routing and distribution networks
• Industrial control logic circuits

Procurement Notes

Verify the package type matches requirements; the 'E' suffix typically indicates a PDIP package. Confirm RoHS compliance status through official datasheets or manufacturer documentation. Ensure the specific revision level meets design constraints. Cross-reference pinouts with schematic diagrams before integration.

Selection Notes

Select this component when both true and complemented outputs are required for a single channel. The HCT series ensures compatibility with 5V TTL logic inputs. Consider thermal management for high-density PCB layouts given the wide operating temperature range. Verify power supply stability within the specified voltage limits.

Part Context

This part belongs to the Texas Instruments CD74HCT family of high-speed CMOS logic devices. It is functionally related to the CD74HC238 but offers TTL-compatible input thresholds. The device serves as a fundamental building block for digital addressing and signal selection tasks in electronic designs.

Replacement Considerations

CD74HCT238PWRE4

FAQ

What is the difference between CD74HC238 and CD74HCT238?

The CD74HCT238 has input thresholds compatible with 5V TTL logic, whereas the HC version uses CMOS thresholds. Both share identical pinouts and logical functions.

How many enable inputs does the CD74HCT238 have?

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