CD74HC574M

Overview

The CD74HC574M is an octal edge-triggered D-type flip-flop manufactured by Texas Instruments. It features three-state outputs and operates within a supply voltage range of 2V to 6V. The device utilizes a 20-pin SOIC package with a width of 0.295 inches (7.50mm). Key electrical parameters include a maximum propagation delay of 32ns at 6V with 150pF load, output currents of 7.8mA for both high and low states, and a static current of 4µA. It supports a clock frequency up to 90 MHz and functions across a temperature range of -55°C to 125°C.

Feature Summary

• Octal configuration providing eight independent D-type flip-flops in a single package
• Three-state outputs allowing direct bus line driving without external buffers
• Positive-edge triggering mechanism synchronized with the clock input
• Wide operating voltage range supporting standard CMOS logic levels

Applications

• Parallel-to-serial data conversion circuits
• Buffering and latching digital signals on system buses
• Register storage elements in microprocessor-based systems
• General-purpose data holding applications in industrial control

Procurement Notes

Verify the specific suffix against the manufacturer datasheet to confirm package type and temperature rating. Ensure the component meets RoHS compliance requirements if mandated by project specifications. Cross-reference the ordering part number with official distributor catalogs to avoid confusion with similar variants such as the M or N suffixes which may indicate different packaging or lead types.

Selection Notes

Select this component when an octal register with tri-state capability is required for bus interfacing. Consider the 20-SOIC package dimensions for PCB layout constraints. Evaluate the 32ns propagation delay against system timing requirements. Verify that the 2V to 6V supply range aligns with the target circuit's power distribution network.

Part Context

This device belongs to the 74HC series of high-speed CMOS logic components. It serves as a fundamental building block for sequential logic design. The part is functionally compatible with other industry-standard octal flip-flops from various manufacturers, facilitating replacement in existing designs where pinout compatibility is maintained.

Replacement Considerations

Direct substitutes include SN74HC574DWR from Texas Instruments and MC74HC574ADWG from onsemi. These alternatives share identical logical functionality and pin configurations. Verify package compatibility and electrical parameter tolerances before implementation.