CD74HCT173M

Overview

The CD74HCT173M is a high-speed CMOS logic device manufactured by Texas Instruments, belonging to the 74HCT series. It contains four D-type flip-flops with three-state outputs, housed in a 16-pin SOIC surface-mount package. The component operates within a supply voltage range of 4.5 V to 5.5 V and supports a wide operating temperature range from -55°C to +125°C. Key electrical parameters include a propagation delay of 38 ns at 4.5 V with 50 pF load, output currents of 4 mA for both high and low states, and a static current of 4 µA. The maximum clock frequency is 60 MHz.

Feature Summary

• Integrates four independent D-type flip-flops with non-inverting data paths.
• Features three-state outputs controlled by an output enable input for bus driving applications.
• Provides synchronous operation triggered by positive-going transitions of the clock signal.
• Includes a master reset input that asynchronously clears all flip-flop outputs to a low state.

Applications

• Register files in digital systems
• Shift registers for data storage and transfer
• Bus-oriented memory implementations
• Parallel-to-serial conversion circuits

Procurement Notes

Verify the manufacturer marking matches Texas Instruments specifications. Confirm the suffix 'M' indicates the SOIC-16 package variant. Ensure RoHS compliance documentation aligns with current environmental regulations. Check datasheet revisions for any pinout or electrical characteristic updates prior to final integration.

Selection Notes

Select this component when TTL-compatible inputs are required alongside CMOS power efficiency. The 74HCT series ensures compatibility with standard 5 V logic families while offering lower power consumption than LSTTL alternatives. Consider the SOIC package for surface-mount assembly requirements and verify thermal performance within the specified industrial temperature range.

Part Context

This part belongs to the Texas Instruments CD74HCT family of high-speed CMOS logic devices. The 74HCT series is designed to be compatible with 74LSTTL inputs, allowing seamless integration into mixed-technology systems. The CD74HCT173 specifically provides quad D-type flip-flops, distinguishing it from other logic functions like gates or decoders within the same product line.

Replacement Considerations

• CD74HC173M
• SN74HCT173N

FAQ

What is the trigger condition for the flip-flops?

The flip-flops are triggered on the positive-going transition of the clock (CLK) input.

How does the master reset function operate?

The master reset (MR) input is asynchronous and active-low; asserting it clears all Q outputs to a low state regardless of clock or data inputs.

What is the input compatibility of the 74HCT series?

The 74HCT series inputs are compatible with 74LSTTL logic levels, allowing direct interfacing with LSTTL sources.