SN74LS164D

Shift Registers Overview

The SN74LS164D is an 8-bit serial-in, parallel-out shift register from the Texas Instruments 74LS series. It features a bipolar logic type and operates within a supply voltage range of 4.75 V to 5.25 V. The device provides push-pull outputs and includes two serial data inputs for flexible configuration. It exhibits a propagation delay of 32 ns and functions reliably across an operating temperature range of 0°C to +70°C. Packaged in a 14-pin SOIC format, this component supports asynchronous reset functionality.

Shift Registers Feature Summary

• Converts serial input data into parallel output states via clocked shifting operations
• Features dual serial input lines allowing independent or combined data entry modes
• Provides eight parallel outputs with push-pull drive capability for direct interfacing

Shift Registers Applications

• Serial-to-parallel data conversion in digital communication interfaces
• Driving LED displays requiring sequential bit activation
• Expanding parallel I/O ports in microcontroller-based systems

Shift Registers Procurement Notes

Verify the specific suffix 'D' confirms the SOIC package variant rather than other housing types. Confirm RoHS compliance status as manufacturing processes evolve. Check for obsolescence notices since some listings indicate end-of-life status for certain variants. Ensure the supplier source matches the original manufacturer specifications for signal integrity.

Shift Registers Selection Notes

Select this component when bipolar LS logic speed and compatibility are required over CMOS alternatives. Verify that the 5V nominal supply aligns with the system power rails. Consider the 14-pin SOIC footprint constraints during PCB layout. Evaluate if the 32 ns delay meets the timing requirements of the target application clock frequency.

Shift Registers Part Context

This part belongs to the standard 74LS164 family of shift registers manufactured by Texas Instruments. It serves as a legacy solution for basic serial data expansion tasks. The device is distinct from HC or ALS variants due to its specific bipolar technology characteristics and voltage thresholds.

Shift Registers Replacement Considerations

SN74LS164DR (Tape & Reel version)

Shift Registers FAQ

How are the two serial inputs configured?

The SN74LS164D has two serial inputs (A and B) that are internally ANDed. Data enters only when both inputs are high, allowing them to be used independently or tied together.

What is the function of the clear pin?

The clear pin provides an asynchronous reset. When driven low, it immediately clears all eight flip-flops, forcing all parallel outputs to a low state regardless of the clock or data inputs.