M74HCT574B1R

Flip Flops Overview

The M74HCT574B1R is an octal D-type positive edge-triggered flip-flop manufactured by STMicroelectronics. It features three-state outputs and operates within a supply voltage range of 4.5V to 5.5V. The device utilizes standard 74HCT logic series technology and is housed in a 20-DIP package with a pitch of 0.300 inches (7.62mm). Key electrical parameters include a maximum propagation delay of 30ns at 4.5V with 50pF load, a clock frequency of 80MHz, and output currents of 4mA for both high and low states. Static current consumption is specified at 4µA. The component supports a wide operating temperature range from -55°C to +125°C.

Flip Flops Feature Summary

• Octal D-type positive edge-triggered flip-flop architecture
• Three-state non-inverting outputs suitable for bus-oriented applications
• Standard 74HCT logic compatibility with TTL-compatible inputs
• Wide operating temperature range for industrial environments

Flip Flops Applications

• Parallel-to-serial data conversion circuits
• Bus-oriented memory register implementations
• High-speed digital signal processing storage elements
• Industrial control system data latching

Flip Flops Procurement Notes

Verify the specific suffix B1R against official datasheets to confirm the tube packaging configuration. Confirm that the 20-DIP physical dimensions match the target PCB footprint requirements. Ensure the 4.5V to 5.5V supply voltage constraint aligns with the system power rails. Check for end-of-life status as availability may be restricted.

Flip Flops Selection Notes

Select this component when an octal register with three-state outputs is required for bus systems. The HCT series ensures direct compatibility with TTL logic levels without additional level shifting. Consider the 80MHz clock frequency limit for high-speed timing constraints. Verify thermal performance within the -55°C to +125°C range for harsh environment deployments.

Flip Flops Part Context

This part belongs to the M74HCT574 family of octal D-type flip-flops. It shares functional pinouts with other industry-standard octal registers but is distinguished by its specific manufacturing process and packaging options offered by STMicroelectronics. The B1R suffix typically denotes a specific tape-and-reel or tube variant within the broader product line.

Flip Flops Replacement Considerations

• CD74HCT574E
• SN74HCT574N

Flip Flops FAQ

What is the function of the Output Enable (OE) pin?

When OE is high, the outputs assume a high-impedance state, isolating the device from the bus while internal data remains stored.

How does the device handle input signals?

It captures data on the positive edge of the clock signal and transfers it to the outputs if the OE pin is low.