74HCT164D14

Shift Registers Overview

The Diodes Incorporated 74HCT164D14 is an 8-bit parallel-out serial shift register housed in a 14-pin PDIP package. It operates on a supply voltage range of 4.5V to 5.5V and features push-pull outputs capable of sourcing or sinking 4mA at VCC = 4.5V. The device utilizes Schmitt trigger inputs for noise immunity and includes asynchronous master reset functionality. It supports positive-edge clock triggering with data shifting from serial inputs (DSA, DSB) to parallel outputs (Q0-Q7).

Shift Registers Feature Summary

• Serial-to-parallel conversion using edge-triggered logic with two logically ANDed input pins.
• Asynchronous master reset that forces all outputs low regardless of clock or data states.
• Schmitt trigger action on all inputs to enhance noise immunity.
• CMOS construction providing low power consumption while maintaining TTL compatibility.

Shift Registers Applications

• General purpose logic circuits
• PCs, networking equipment, notebooks, and netbooks
• Computer peripherals including hard drives and CD/DVD ROMs
• Televisions, DVDs, DVRs, and set-top boxes

Shift Registers Procurement Notes

Verify the specific ordering suffix 'D14' confirms the PDIP-14 package type, as other suffixes indicate different form factors like SO-14 or TSSOP-14. Confirm RoHS compliance status and lead-free specifications match project requirements. Ensure the operating temperature range of -40°C to +125°C aligns with environmental conditions. Check for any recent product change notices regarding marking or assembly updates.

Shift Registers Selection Notes

Select this component when a standard 8-bit shift register with TTL-compatible logic levels is required. The HCT series ensures direct interface with 5V TTL systems. Consider the PDIP-14 package only if through-hole mounting is necessary; otherwise, evaluate surface-mount alternatives like the S14 or T14 variants. Verify that the 4mA output drive current meets the load requirements of the connected circuitry.

Shift Registers Part Context

This part belongs to the 74HCT164 family of 8-bit serial-in parallel-out shift registers manufactured by Diodes Incorporated. It is designed to replace older LSTTL devices while offering CMOS benefits. The D14 suffix specifically denotes the plastic dual-in-line package variant within the broader 74HCT164 product line.

Shift Registers Replacement Considerations

Publicly confirmed parameter-equivalent substitutes include the 74AHCT164D14 from Diodes Incorporated and the CD74HCT164E from Texas Instruments.

Shift Registers FAQ

How are the serial data inputs DSA and DSB configured?

The serial data inputs DSA and DSB are internally ANDed. Either pin can serve as the data input while the other acts as an active HIGH enable, or both can be tied together for single-input operation.

What is the function of the Master Reset (MR) pin?

When asserted LOW, the MR pin asynchronously resets all Q outputs to LOW. This action overrides all other signals and does not depend on the clock or data input states.

Does the device support high-voltage ESD protection?

Yes, the device provides ESD protection exceeding 2000-V Human Body Model (A114), 200-V Machine Model (A115), and 1000-V Charged Device Model (C101).