CD74HC74E

Overview

The CD74HC74E is a dual D-type flip-flop manufactured by Texas Instruments, belonging to the high-speed CMOS (74HC) logic family. It features two independent positive-edge-triggered D flip-flops with separate data inputs and outputs within a single package. The device operates on a supply voltage range of 2 V to 6 V and supports through-hole mounting in a standard 14-pin PDIP package. It includes dedicated set and clear inputs for direct control of the output states.

Feature Summary

• Dual independent D-type flip-flops with positive-edge triggering
• Direct asynchronous set and clear input control
• High-speed CMOS technology compatible with standard logic families

Applications

• Parallel-to-serial data conversion circuits
• Shift register construction
• General-purpose storage elements in digital systems

Procurement Notes

Verify the component marking matches the exact part number CD74HC74E to distinguish it from similar variants such as the HCT series or other manufacturers' equivalents. Confirm that the package type corresponds to the specified PDIP configuration and check for any specific handling requirements related to static-sensitive devices during installation.

Selection Notes

Select this component when a design requires two independent D-type memory elements with asynchronous preset and clear capabilities. Ensure the system power supply remains within the 2 V to 6 V operational range. Consider the propagation delay characteristics typical of the HC series if timing constraints are critical for the application.

Part Context

This part belongs to the widely used 74HC series of logic integrated circuits, known for their compatibility with TTL logic levels while offering low power consumption. The CD prefix indicates a commercial temperature grade device. It serves as a fundamental building block for sequential logic designs requiring simple data storage and transfer functions.

Replacement Considerations

SN74HC74N

FAQ

What is the trigger type for the CD74HC74E?

The flip-flops are triggered on the positive edge of the clock signal.

Does the CD74HC74E have asynchronous control inputs?

Yes, it includes dedicated Set and Clear inputs that operate independently of the clock signal.