CD74HC173E

Overview

The CD74HC173E is a D-Type Flip-Flop from the HC logic series, manufactured by Harris Corporation. It integrates four independent circuits within a single package. The device features single-ended inputs and non-inverting polarity. Outputs are configured as 3-State. It operates on a supply voltage ranging from 2 V to 6 V. The propagation delay is specified at 200 ns. Output currents are rated at -7.8 mA for high level and 7.8 mA for low level. The component supports surface mount installation in a TSSOP-16 package. It functions reliably across an operating temperature range of -55 C to +125 C.

Feature Summary

• Integrates four independent D-type flip-flops with positive edge triggering capability
• Provides tri-state outputs for efficient bus-oriented memory and register operations
• Supports wide supply voltage operation from 2 V to 6 V for flexible system integration
• Features high-speed CMOS construction ensuring low power dissipation and noise immunity

Applications

• Bus-oriented register configurations
• Two-bit parallel-address registers
• Shift register applications requiring tri-state control
• Memory mapping in microprocessor systems

Procurement Notes

Verify the manufacturer designation carefully, as Harris Corporation's semiconductor assets were acquired by Texas Instruments. Ensure the specific ordering suffix matches the required package type and tape/reel specifications. Confirm RoHS compliance status through official documentation, as legacy Harris parts may have varying environmental declarations. Cross-reference the datasheet revision to ensure compatibility with current design requirements and pinout definitions.

Selection Notes

Select this component when designing systems requiring quad D-type latches with tri-state output control. The HC series offers standard CMOS performance suitable for general-purpose digital logic. Consider the TSSOP-16 package constraints for PCB layout. Evaluate the 200 ns propagation delay against system timing requirements. Ensure the operating temperature range meets the environmental conditions of the target application.

Part Context

The CD74HC173 belongs to the widely used 74HC family of high-speed CMOS logic devices. Originally developed by Harris Semiconductor, these components are now often associated with Texas Instruments following industry acquisitions. The device serves as a fundamental building block for sequential logic circuits, providing reliable data storage and transfer capabilities in digital electronics.

Replacement Considerations

CD74HC173PWR

FAQ

What is the trigger mechanism for the CD74HC173E?

The device utilizes positive edge triggering for all four flip-flops.

Does the CD74HC173E support hold mode?

Yes, the device includes a hold mode feature to maintain stored data without clock input.