CD74HCT574ME4

Overview

The CD74HCT574ME4 is an octal edge-triggered D-type flip-flop manufactured by Texas Instruments. It features three-state outputs and operates within a voltage range of 4.5 V to 5.5 V. The device utilizes High-Speed CMOS technology with TTL-compatible inputs, ensuring low power consumption and high noise immunity. Key electrical parameters include a typical propagation delay of 22 ns at 5 V and output drive capabilities of ±6 mA. It is housed in a 20-SOIC package and supports through-hole mounting.

Feature Summary

• Octal positive-edge-triggered D-type flip-flops with three-state outputs
• TTL voltage compatible inputs for seamless integration with logic families
• High-speed CMOS construction offering low power dissipation
• Designed specifically for bus-oriented systems and buffer applications

Applications

• Buffer registers and working registers
• I/O port implementations
• Bidirectional bus drivers

Procurement Notes

Verify the current manufacturing status as this component may be obsolete or superseded. Confirm that the 20-SOIC package matches your PCB footprint requirements. Ensure supply chain sources provide genuine Texas Instruments products to avoid counterfeit risks. Check for recommended replacement parts if availability is limited.

Selection Notes

Select this component when designing systems requiring octal storage with bus-driven outputs. It is suitable for applications needing TTL input compatibility alongside CMOS performance. Consider the 22 ns propagation delay for timing constraints. Verify that the 4.5 V to 5.5 V operating range aligns with your system's power supply specifications.

Part Context

This part belongs to the SN74HC/HCT574 family of octal D-type flip-flops. It shares functional similarities with other members like the SN74HCT574 but differs in packaging and specific ordering suffixes. The ME4 suffix indicates a specific tape-and-reel or tube configuration variant within the broader HCT logic series designed for high-speed digital applications.

Replacement Considerations

The CD74HCT574M is listed as a manufacturer-recommended substitute. Verify pinout compatibility and electrical characteristics before swapping. Other family members may require re-evaluation of input/output levels.