74VHCT574AN

Overview

The Fairchild Semiconductor 74VHCT574AN is an octal D-type flip-flop featuring three-state outputs, designed for high-speed CMOS applications. It operates within a supply voltage range of 2 V to 6 V and supports a maximum clock frequency of 95 MHz. The device exhibits a typical propagation delay of 10 ns at 5 V with 50 pF load capacitance. It provides output drive currents of 8 mA for both sourcing and sinking. The component is housed in a 20-pin DIP package and functions over an extended temperature range from -40 °C to +85 °C.

Feature Summary

• Octal D-type flip-flop architecture with non-inverting data paths
• Three-state outputs enabling bus-oriented system integration
• TTL-compatible input logic levels for direct interfacing
• Power-down protection on inputs and outputs

Applications

• High-speed data latching in digital systems
• Bus-oriented memory register implementations
• Input/output port expansion for microprocessors
• Parallel-to-serial data conversion circuits

Procurement Notes

Verify the specific manufacturer designation, as Fairchild Semiconductor operations were acquired by ON Semiconductor. Confirm that the part number corresponds to the VHCT series specifications rather than standard HC or HCT variants. Ensure the package type matches the required PCB footprint and verify RoHS compliance status for current production units.

Selection Notes

Select this component when TTL-compatible input thresholds are required alongside high-speed CMOS performance. The VHCT series offers faster operation than standard HCT devices while maintaining compatibility with 5 V logic families. Consider the 20-pin DIP package for through-hole assembly requirements and ensure the operating voltage range aligns with the system power supply constraints.

Part Context

The 74VHCT574AN belongs to the advanced high-speed CMOS VHCT family, bridging the performance gap between standard CMOS and bipolar Schottky TTL technologies. It provides high-speed operation similar to equivalent Bipolar Schottky TTL while maintaining low CMOS power dissipation. This octal flip-flop is functionally comparable to other industry-standard octal registers but optimized for VHCT logic level compatibility.

Replacement Considerations

MC74VHCT574ADTG (ON Semiconductor)

FAQ

What is the maximum clock frequency for the 74VHCT574AN?

The maximum clock frequency is 95 MHz.

Does the 74VHCT574AN include power-down protection?

Yes, the device includes power-down protection on its inputs and outputs.