CD74HC126E

Overview

The CD74HC126E is a bus driver from the HC/UH series, manufactured by Harris Corporation. It features four functional units, each handling one bit of data, resulting in a 4-bit wide configuration. The device utilizes CMOS technology and provides true output polarity with three-state output characteristics. It operates within a supply voltage range of 2V to 6V and supports an operating temperature range from -55°C to 125°C. The component is housed in a PDIP-14 package.

Feature Summary

• Provides four independent buffer channels with true output polarity for signal transmission.
• Features three-state outputs allowing multiple drivers to share a common bus line without interference.
• Utilizes high-speed CMOS technology compatible with standard logic families.

Applications

• High-speed data bus buffering in digital systems
• Driving capacitive loads on communication lines
• Isolating input signals from output drivers in microcontroller interfaces

Procurement Notes

Verify the manufacturer origin, as Harris Corporation assets were acquired by Texas Instruments. Confirm the specific package type (PDIP) and ensure the RoHS status matches project requirements, as older Harris batches may not comply with current environmental directives. Cross-reference datasheets between original Harris and subsequent TI releases for pinout consistency.

Selection Notes

Select this component when four buffered channels with tri-state capability are required. Ensure the system voltage falls within the 2V to 6V range. Consider the PDIP-14 package constraints if surface mount space is limited. Verify that the propagation delay specifications meet the timing requirements of the target application circuit.

Part Context

This part belongs to the CD74HCxx series of high-speed CMOS logic devices. It is functionally similar to other quad buffers like the CD74HC125, differing primarily in control logic or specific electrical characteristics defined by the manufacturer's legacy documentation. It serves as a fundamental building block for digital interface circuits.

Replacement Considerations

Texas Instruments CD74HC126E is the direct successor and equivalent part following the acquisition of Harris Semiconductor logic products. Other manufacturers offering pin-compatible quad 3-state buffers should be verified against the specific electrical parameters of the HC/UH series.