CD74HCT173E

Overview

The CD74HCT173E is a high-speed CMOS logic device featuring four independent D-type flip-flops with three-state outputs. It operates within a supply voltage range of 2V to 6V and supports clock frequencies up to 60MHz. The component exhibits a propagation delay of 40ns at 4.5V with a 50pF load. It functions across an operating temperature range of -55°C to +125°C. The device provides significant power reduction compared to LSTTL logic ICs while maintaining TTL compatibility, capable of driving 15 LSTTL loads on bus driver outputs.

Feature Summary

• High-speed CMOS technology offering reduced power consumption relative to LSTTL equivalents
• Quad D-type flip-flop architecture with positive edge triggering
• Three-state outputs enabling direct connection to system buses
• TTL-compatible input levels for seamless integration with standard logic families

Applications

• Bus driver applications requiring tri-state control
• Parallel-to-serial data conversion circuits
• Register storage in digital processing systems
• Timing synchronization elements in high-speed logic designs

Procurement Notes

Verify the package type matches the required PCB footprint, specifically the 16-pin DIP configuration. Confirm the suffix 'E' denotes the specific manufacturing variant and operating temperature range. Ensure the supplier provides documentation confirming compliance with the specified electrical characteristics and thermal limits for the intended application environment.

Selection Notes

Select this component when designing systems requiring low-power CMOS operation with TTL interface compatibility. It is suitable for applications needing multiple independent storage elements with output enable capabilities. Consider the 60MHz clock limit and 40ns propagation delay for timing constraints. Evaluate the wide operating temperature range if the device will be used in harsh industrial or automotive environments.

Part Context

This part belongs to the Texas Instruments HCT series of high-speed CMOS logic devices. It serves as the CMOS equivalent to the legacy 74173 TTL quad D-type flip-flop. The series is designed to provide performance improvements over earlier logic families while maintaining backward compatibility with standard TTL input thresholds and output drive capabilities.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.