CD74HC74E

Overview

The CD74HC74E is a dual D-type flip-flop manufactured by Harris Corporation, belonging to the 74HC series of high-speed CMOS logic. It features two independent positive-edge-triggered circuits with separate data (D) inputs and Q outputs, along with shared asynchronous preset and clear inputs. The device operates within a supply voltage range of 2V to 6V and supports a maximum frequency of 38MHz. It is housed in a standard 14-pin DIP package designed for through-hole mounting.

Feature Summary

• Dual independent D-type flip-flops with positive-edge triggering
• Asynchronous active-low preset and clear control inputs
• High noise immunity with balanced propagation delays
• Direct LSTTL input compatibility when operating at 5V

Applications

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

Procurement Notes

Verify component authenticity as the manufacturer is Harris Corporation and the part status is listed as obsolete. Confirm that the 14-DIP package matches the target PCB footprint requirements. Ensure the supply voltage range of 2V to 6V aligns with the system design. Check for RoHS compliance status if environmental regulations apply to the end product.

Selection Notes

Select this component for designs requiring dual edge-triggered storage with dedicated reset and set functions. The HC series offers low power consumption suitable for battery-operated devices. Consider the 38MHz speed limit for clock signal integrity. Verify that the 14-pin DIP form factor fits the assembly constraints compared to surface-mount alternatives.

Part Context

This device is part of the widely adopted 74HC family of logic integrated circuits. It provides a standard interface for sequential logic operations in mixed-signal environments. The CD74HC74E specifically addresses the need for compact, reliable dual flip-flop solutions in industrial and consumer electronics applications requiring robust CMOS performance.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.