CD74HCT164E

Shift Registers Overview

The CD74HCT164E is an 8-bit serial-in, parallel-out (SIPO) shift register manufactured by Texas Instruments. It belongs to the HCT logic series and utilizes CMOS technology. The device operates within a supply voltage range of 4.5 V to 5.5 V. It features two gated serial data inputs (DSA and DSB) that function as logical AND gates for data entry. An asynchronous master reset (MR) input clears all outputs to a low state when driven low. Data shifts on the positive edge of the clock (CP) input. The component is housed in a 14-pin PDIP package and supports through-hole mounting.

Shift Registers Feature Summary

• Provides 8-bit serial-to-parallel data conversion capability
• Features dual gated serial inputs for controlled data entry
• Includes asynchronous master reset functionality for immediate output clearing
• Ensures TTL-level compatibility through HCT logic family design

Shift Registers Applications

• General-purpose serial-to-parallel data conversion circuits
• Digital display driver interfaces requiring parallel output expansion
• Microcontroller peripheral expansion systems
• Industrial control logic sequencing applications

Shift Registers Procurement Notes

Verify the specific suffix 'E' confirms the PDIP-16 through-hole package variant. Confirm the manufacturer is Texas Instruments, as other vendors produce pin-compatible parts under different part numbers. Ensure the order specifies the correct logic family (HCT) for required voltage compatibility. Check datasheet revisions for any updates to electrical characteristics or mechanical dimensions before finalizing procurement specifications.

Shift Registers Selection Notes

Select this component when an 8-bit SIPO configuration is required with direct TTL interface compatibility. The HCT series ensures operation at standard 5V logic levels while maintaining CMOS power efficiency. Consider the PDIP-14 package only if through-hole assembly is mandated by the PCB design. Verify that the asynchronous reset requirement aligns with system timing constraints, as this feature overrides normal shifting operations immediately upon activation.

Shift Registers Part Context

This part is a member of the Texas Instruments CD74HCTxx series of high-speed CMOS logic devices. It is functionally equivalent to the industry-standard 74HCT164 specification. The device serves as a fundamental building block for digital systems needing data serialization management. It complements other HCT logic families such as flip-flops and counters within complex integrated circuit designs.

Shift Registers Replacement Considerations

• CD74HCT164M96
• CD74HCT164M

Shift Registers FAQ

How are the two serial data inputs utilized?

The DSA and DSB inputs act as a logical AND gate. Data enters the shift register only when both inputs are high, or one can be used as an enable while the other carries the data.

What triggers the data shift operation?

Data is shifted into the register on the positive-going edge (rising edge) of the Clock (CP) input signal.

Does the reset function affect the clock input?

No, the Master Reset (MR) is asynchronous. A low level on MR immediately clears all outputs to low regardless of the clock state or other inputs.