74AHCT164D,118

Shift Registers Overview

The Nexperia 74AHCT164D,118 is an 8-bit serial-in/parallel-out shift register housed in a 14-lead SO plastic small outline package (SOT108-1). It operates within a supply voltage range of 4.5 V to 5.5 V and supports an ambient temperature range from -40 °C to +125 °C. The device features two serial data inputs (DSA and DSB) and eight parallel outputs (Q0 to Q7), with data shifting occurring on LOW-to-HIGH clock transitions. It includes an active LOW master reset input that clears the register.

Shift Registers Feature Summary

• Features TTL-compatible input levels for direct interfacing with standard logic families
• Includes overvoltage tolerant inputs allowing operation in mixed-voltage environments
• Provides balanced propagation delays across all output stages

Shift Registers Applications

• Serial-to-parallel data conversion in digital systems
• Parallel output expansion for microcontroller applications
• Data storage and buffering in communication interfaces

Shift Registers Procurement Notes

Verify the specific ordering suffix '118' corresponds to the tape and reel packaging format required for automated assembly processes. Confirm that the SO14 package dimensions align with the target PCB footprint specifications. Ensure the operating environment remains within the specified -40 °C to +125 °C temperature range to maintain performance reliability.

Shift Registers Selection Notes

Select this component when TTL-level input compatibility is required alongside high-speed serial-to-parallel conversion capabilities. The 74AHCT series is appropriate for designs operating strictly at 5 V logic levels. Consider alternative packages such as TSSOP or DHVQFN if space constraints or thermal requirements differ from the standard SO14 form factor.

Shift Registers Part Context

This part belongs to the 74AHC/AHCT logic family, which combines the high speed of AHC technology with the CMOS compatibility of AHCT. The 74AHCT164 variant specifically targets 5 V applications requiring robust noise immunity and low power consumption. It serves as a fundamental building block for sequential logic circuits requiring simple data shifting operations.

Shift Registers Replacement Considerations

Cross-reference with other manufacturers offering equivalent 8-bit serial-in/parallel-out shift registers in SOIC-14 packages. Verify pinout compatibility and electrical characteristics match the original design requirements before substitution.

Shift Registers FAQ

How does the master reset input function?

The master reset (MR) input is active LOW. When driven LOW, it clears the register and forces all outputs (Q0 to Q7) LOW, independent of the clock or data inputs.

What determines the data entry mode?

Data enters serially through either DSA or DSB. Either input can serve as an active HIGH enable for data entry through the other input, allowing flexible configuration for serial data loading.