CD74HCT139EE4

Overview

The CD74HCT139EE4 is a high-speed CMOS logic device containing two independent binary to one-of-four decoders or 1-to-4 line demultiplexers. It operates on a single power supply ranging from 4.5V to 5.5V and features active-low mutually exclusive outputs. The HCT logic family provides direct compatibility with LSTTL inputs, ensuring functional equivalence to the LS logic family while offering significant power reduction compared to standard TTL devices.

Feature Summary

• Contains two independent decoder/demultiplexer circuits within a single package
• Features active-low mutually exclusive outputs for precise signal routing
• Provides direct LSTTL input logic compatibility for seamless integration

Applications

• Memory decoding in digital systems
• Data routing applications
• Code conversion tasks

Procurement Notes

Verify the complete part number including the EE4 suffix when ordering to ensure correct RoHS compliance and lead finish specifications. Confirm that the PDIP package variant matches your board layout requirements. Check current production status as component availability may vary over time.

Selection Notes

Select this component when dual independent decoding functions are required within a single footprint. The HCT series is appropriate for designs needing direct interface with LSTTL logic levels without additional level shifting circuitry. Ensure the operating voltage range aligns with the system's 5V power supply constraints.

Part Context

This device belongs to the Texas Instruments CD74HCT139 family of high-speed CMOS logic components. It is functionally identical to the CD4556B and maintains pin compatibility with it. The product serves as a catalog item designed for general-purpose digital logic applications requiring efficient decoding capabilities.

Replacement Considerations

CD74HC139E is listed as a manufacturer-recommended alternative.