MC74ACT74D

Flip Flops Overview

The MC74ACT74D is a dual D-type positive edge-triggered flip-flop from the 74ACT logic series, manufactured by onsemi. It features two independent circuits in a 14-SOIC package. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports synchronous data transfer on the clock's rising edge. It includes asynchronous preset and clear inputs that override clock signals. Output types are differential (complementary Q and Q-bar), with source/sink current capabilities of 24 mA. Propagation delay is specified at 11 ns. Operating temperature ranges from -40°C to +85°C.

Flip Flops Feature Summary

• Dual D-type configuration with positive edge triggering for precise timing control
• Asynchronous preset and clear inputs for immediate state initialization
• TTL-compatible input levels ensuring interoperability with standard logic families
• Complementary outputs providing both true and inverted signal availability

Flip Flops Applications

• Data storage registers in digital systems
• Shift register implementations
• Timing synchronization circuits
• State machine design components

Flip Flops Procurement Notes

Verify the specific suffix 'D' corresponds to the SOIC-14 package variant when sourcing. Confirm RoHS compliance status through official manufacturer documentation or authorized distributor declarations. Ensure the ordering part number matches the exact package style required for PCB layout compatibility. Cross-reference datasheet revisions to confirm pinout consistency across manufacturing batches.

Flip Flops Selection Notes

Select this component for applications requiring TTL-compatible CMOS performance with moderate speed. The 11 ns propagation delay suits general-purpose digital logic where high-frequency operation is not critical. Consider the 24 mA output drive capability for direct interfacing with loads. Evaluate thermal requirements against the -40°C to +85°C operating range for environmental suitability.

Flip Flops Part Context

This part belongs to the MC74ACT74 family, which includes variants like MC74ACT74DG and MC74ACT74DR. These devices share identical logical functionality but differ in packaging styles such as SOIC, TSSOP, or tape-and-reel configurations. The MC74ACT74D specifically denotes the SOIC-14 surface-mount package version within this product line.

Flip Flops Replacement Considerations

MC74ACT74DG

Flip Flops FAQ

How do the asynchronous preset and clear inputs function relative to the clock?

The preset and clear inputs operate independently of the clock signal. Asserting these inputs immediately forces the output to a defined state, overriding any pending clock-triggered data transitions.

What is the significance of the TTL-compatible input specification?

TTL compatibility allows the MC74ACT74D to interface directly with older LSTTL logic families without requiring additional level-shifting circuitry, simplifying system design in mixed-technology environments.