SN74LS164DR

Shift Registers Overview

The SN74LS164DR is an 8-bit serial-in, parallel-out shift register manufactured by Texas Instruments. It belongs to the 74LS logic family and utilizes bipolar technology. The device operates within a supply voltage range of 4.75V to 5.25V and supports a maximum clock frequency of 60MHz at 5V with a 15pF load. It features push-pull outputs and includes asynchronous reset functionality. The component is housed in a 14-SOIC package (0.154 inch width) and is rated for operation between 0°C and 70°C.

Shift Registers Feature Summary

• Serial-to-parallel data conversion capability
• Asynchronous master reset function
• Push-pull output configuration

Shift Registers Applications

• General-purpose digital logic circuits
• Data storage applications
• Parallel output generation from serial inputs

Shift Registers Procurement Notes

Verify the specific suffix 'DR' corresponds to the 14-SOIC surface-mount package and reel packaging format. Confirm RoHS3 compliance status as indicated in official documentation. Ensure the ordering part number matches the exact manufacturer designation to avoid discrepancies in pinout or electrical characteristics during procurement.

Shift Registers Selection Notes

Select this component when a low-cost, 8-bit shift register with parallel outputs is required for standard TTL-compatible logic levels. Consider the SOIC package size for surface-mount assembly constraints. Verify that the operating temperature range of 0°C to 70°C meets the environmental requirements of the target application before finalizing the design.

Shift Registers Part Context

This device is part of the broader 74LS164 series, which includes variants such as the through-hole SN74LS164N. The 'DR' suffix specifically denotes the tape-and-reel surface-mount version in a 14-pin Small Outline Integrated Circuit (SOIC) package. It shares functional compatibility with other 74LS series logic components while offering distinct packaging advantages for automated assembly processes.

Shift Registers Replacement Considerations

SN74LS164DRE4

Shift Registers FAQ

What is the function of the two serial input pins?

The device has two AND-gated serial input pins (A and B). Either can serve as a data input, with the other acting as an enable control. They should be tied together or connected to a high level if only one input is used.

How does the asynchronous reset operate?

The Master Reset (MR) pin is active-low. When driven low, it immediately clears all eight outputs (Q0-Q7) to a low state, regardless of the clock or data input conditions.