SN74HC164NSR

Shift Registers Overview

The SN74HC164NSR is an 8-bit serial-in, parallel-out shift register manufactured by Texas Instruments. It operates within a supply voltage range of 2 V to 6 V and features AND-gated serial inputs (A and B) alongside an asynchronous clear (CLR) input. The device utilizes high-speed CMOS technology with typical propagation delays of 20 ns at 5 V. It provides push-pull outputs capable of driving up to 10 LSTTL loads with ±4 mA output drive current at 5 V. The component is housed in a 14-pin Small Outline Package (SOP) and supports operating temperatures from -40°C to 125°C.

Shift Registers Feature Summary

• Features AND-gated serial inputs that permit complete control over incoming data entry
• Includes an asynchronous clear input for immediate reset of all registers
• Provides fully buffered clock and serial inputs to ensure signal integrity
• Delivers low power consumption with maximum ICC of 80 µA

Shift Registers Applications

• Programmable Logic Controllers
• Appliances
• Video Display Systems
• Output Expander

Shift Registers Procurement Notes

Verify the specific ordering suffix NSR corresponds to the 14-pin SOP package with tape-and-reel carrier configuration. Confirm RoHS compliance status and lead finish specifications against the latest TI Packaging Information addendum. Ensure the procurement channel sources directly from authorized distributors to guarantee authenticity and traceability of the production batch.

Shift Registers Selection Notes

Select this component when an 8-bit serial-to-parallel conversion is required with synchronous data shifting on the rising edge of the clock. The dual gated serial inputs allow flexible data enable/disable logic without external gating components. Consider the wide operating voltage range and temperature stability for industrial environments requiring robust CMOS logic performance.

Shift Registers Part Context

This part belongs to the SNx4HC164 family of 8-bit shift registers produced by Texas Instruments. The HC series denotes high-speed CMOS logic compatible with standard TTL interfaces. The NSR suffix indicates the specific surface-mount SOP packaging variant designed for automated assembly processes, distinguishing it from through-hole or other surface-mount options within the same logical family.

Shift Registers Replacement Considerations

Direct substitutes include SN74HC164DR and SN74HC164PW. Verify pinout compatibility and electrical characteristics before substitution. Ensure the replacement part matches the required package type and thermal performance specifications for the target application.

Shift Registers FAQ

How does the AND-gated serial input function?

Data enters the first flip-flop only when both serial inputs A and B are high. A low level at either input inhibits new data entry and resets the first flip-flop to low upon the next clock pulse.

What triggers the data shift operation?

The device clocks data into the registers on the low-to-high-level transition of the CLK input. Data can be changed while CLK is high or low, provided setup time requirements are met.

What is the function of the CLR pin?

The CLR pin provides an asynchronous clear function. When driven low, it immediately sets all eight register outputs to a low state, independent of the clock signal.