74HC74D

Overview

The Toshiba 74HC74D is a dual D-type flip-flop integrated circuit belonging to the 74HC CMOS logic family. It features positive-edge triggering and includes dedicated Set (preset) and Reset inputs for direct control of output states. The device operates within a supply voltage range of 2V to 6V, supporting complementary outputs with specified high and low current capabilities. Key electrical parameters include a maximum propagation delay of 14ns at 5V and a clock frequency rating of up to 77MHz. It is housed in a 14-SOIC surface-mount package and supports an operating temperature range from -40°C to +85°C.

Feature Summary

• Dual D-type flip-flops with positive-edge clock triggering
• Integrated asynchronous Set and Reset functions
• Complementary output configuration
• CMOS technology ensuring low static power consumption

Applications

• Data storage and register circuits
• Shift register implementations
• Frequency division and counting applications
• Digital signal processing timing control

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm package integrity and pin alignment against the 14-SOIC specification. Check for RoHS compliance status if required by project standards. Ensure handling procedures adhere to electrostatic discharge protection guidelines during installation.

Selection Notes

Select this component when dual independent D-latches are required in a compact surface-mount form factor. Consider the 74HC series compatibility for standard logic interfacing. Evaluate the 2V to 6V supply range against system power constraints. Verify that the 14ns propagation delay meets the target application's timing requirements.

Part Context

This part belongs to the widely adopted 74HC series of high-speed CMOS logic devices. It serves as a fundamental building block for sequential logic design. The 74HC74D variant specifically provides two isolated flip-flops, distinguishing it from single-flip-flop or octal-register counterparts within the same logical family.

Replacement Considerations

Cross-reference with other manufacturers' 74HC74 equivalents for pin-compatible substitution. Verify functional equivalence regarding Set/Reset polarity and propagation delays before implementation.