CD74ACT574EX

Overview

The CD74ACT574EX is an octal D-type flip-flop from the ACT logic series, manufactured by Harris Corporation. It features eight positive-edge-triggered registers with true outputs and a 20-pin PDIP package. The device operates within a supply voltage range of 4.5V to 5.5V. Key electrical parameters include a maximum operating frequency of 85 MHz at nominal supply, a load capacitance of 50 pF, and output drive currents of ±24 mA. It supports a wide operating temperature range from -55°C to +125°C.

Feature Summary

• Octal D-type flip-flop architecture providing eight independent positive-edge-triggered registers
• True output polarity compatible with standard bus-oriented applications
• High-speed CMOS technology enabling operation up to 85 MHz
• Robust output drive capability with ±24 mA current ratings

Applications

• Bus-oriented memory register implementations
• Parallel-to-serial data conversion circuits
• Industrial control systems requiring extended temperature stability
• High-speed digital signal processing interfaces

Procurement Notes

Verify component authenticity through official manufacturer channels or authorized distributors. Confirm that the part matches the specific CD74ACT574EX designation, including the EX suffix for DIP-20 packaging. Check for RoHS compliance status as indicated in official documentation, noting potential variations between original Harris and subsequent Texas Instruments production runs. Ensure storage conditions meet moisture sensitivity level requirements for leaded packages.

Selection Notes

Select this component when designing systems requiring high-speed octal latching with true outputs. The ACT series offers superior speed compared to standard 74LS equivalents while maintaining CMOS low power characteristics. Consider the 20-pin DIP package for through-hole prototyping or legacy board compatibility. Verify that the 85 MHz frequency specification meets system timing requirements under the intended load capacitance and supply voltage conditions.

Part Context

This component belongs to the Harris CD74ACT family of advanced CMOS logic devices. Harris Corporation was acquired by National Semiconductor, which later merged with Texas Instruments. Consequently, datasheets and specifications may reference either Harris or Texas Instruments branding depending on the production era. The CD74ACT574EX represents the octal D-flip-flop variant within this high-performance logic line.

Replacement Considerations

SN74ACT574N (Texas Instruments) is a confirmed functional substitute with identical logical operations and pinout compatibility.