74AC574TTR

Overview

The 74AC574TTR is an octal D-type flip-flop manufactured by STMicroelectronics, belonging to the 74AC logic series. It features positive-edge triggering and three-state non-inverting outputs. The device operates within a supply voltage range of 2V to 6V and supports a maximum clock frequency of 250 MHz. Key electrical parameters include a maximum propagation delay of 9.5ns at 5V with 50pF load, output currents of ±24mA, and a static current of 4µA. It is housed in a 20-TSSOP surface-mount package and functions across a temperature range of -55°C to +125°C.

Feature Summary

• Octal D-type configuration with positive-edge triggering for synchronized data storage
• Three-state non-inverting outputs enabling direct bus interface connections
• High-speed CMOS technology supporting operation up to 250 MHz
• Wide operating voltage range from 2V to 6V for flexible power integration

Applications

• Parallel-to-serial data conversion circuits
• Buffering and latching digital signals on system buses
• General-purpose register implementations in high-speed logic systems

Procurement Notes

Verify component authenticity through official manufacturer channels or authorized distributors. Confirm that the specific suffix matches the requested 20-TSSOP packaging and lead-free specifications. Ensure compliance with RoHS3 standards as documented in the product datasheet. Cross-reference the full part number against the manufacturer's current production status to confirm availability and obsolescence warnings prior to final procurement decisions.

Selection Notes

Select this component when designing systems requiring octal storage with high switching speeds and wide voltage tolerance. The 74AC series offers superior speed compared to standard HC logic while maintaining CMOS low power characteristics. Consider the 20-TSSOP package for compact surface-mount designs. Evaluate the 250 MHz clock limit and 9.5ns propagation delay against system timing requirements to ensure signal integrity and proper setup/hold times are met during operation.

Part Context

This component is part of the 74AC family of high-speed CMOS logic devices produced by STMicroelectronics. The 74AC series is designed to provide performance levels comparable to TTL but with lower power consumption and wider voltage compatibility. As an octal flip-flop, it serves as a fundamental building block for sequential logic circuits, offering reliable data retention and fast transition capabilities suitable for complex digital processing applications.

Replacement Considerations

Direct substitutes include SN74AC574DWR (Texas Instruments) and MC74AC574DWG (onsemi). Verify pinout compatibility and electrical parameter alignment before substitution.