CD74HC173PWR

Overview

The CD74HC173PWR is a high-speed CMOS quad D-type flip-flop manufactured by Texas Instruments. It features four independent edge-triggered D-type flip-flops with tri-state outputs in a TSSOP-16 package. The device operates within a supply voltage range of 2 V to 6 V and supports a maximum clock frequency of 60 MHz. Key electrical parameters include a propagation delay of 200 ns, an output current capability of ±7.8 mA, and an operating temperature range from -55 °C to +125 °C. It includes an asynchronous master reset and dual data/output enable inputs for flexible bus interfacing.

Feature Summary

• Contains four independent positive-edge-triggered D-type flip-flops for parallel data storage.
• Features tri-state outputs controlled by dual active-low output enable inputs for efficient bus driving.
• Includes an active-high asynchronous master reset input to clear all flip-flops immediately.
• Supports synchronous data loading via dual active-low data enable inputs on the rising clock edge.

Applications

• High-speed disk and tape controllers
• Communication buffer applications
• Parallel-to-serial data conversion circuits
• Register banks in microprocessor-based systems

Procurement Notes

Verify that the component matches the specific CD74HC173PWR designation to ensure compatibility with HC logic family requirements. Confirm the TSSOP-16 surface-mount package type aligns with PCB layout specifications. Check RoHS compliance status against project environmental standards. Validate the active production status to ensure long-term availability for manufacturing. Ensure supply chain sources provide authentic Texas Instruments products to maintain signal integrity and performance reliability.

Selection Notes

Select this component when designing circuits requiring four-bit parallel registers with tri-state output control. It is suitable for applications needing wide supply voltage flexibility between 2 V and 6 V. Consider its 60 MHz maximum clock speed for high-frequency timing requirements. Evaluate the ±7.8 mA drive capability against load requirements. Choose this part over standard TTL variants if lower power consumption and broader voltage operation are necessary for the system design.

Part Context

The CD74HC173 belongs to the widely used 74HC series of high-speed CMOS logic devices. This series is known for compatibility with standard TTL logic levels while offering improved noise immunity and lower power dissipation. The CD74HC173 specifically provides a quad D-type flip-flop configuration, serving as a fundamental building block for sequential logic designs. Its widespread adoption stems from its robust performance across industrial and commercial temperature ranges.

Replacement Considerations

Public confirmed substitute part numbers include CD74HC173PW and CD74HC173PWE4. Verify pinout and electrical characteristics match before substitution. Ensure the alternative package variant meets mechanical constraints.