SN74HCS164DR

Shift Registers Overview

The SN74HCS164DR is an 8-bit parallel-out serial shift register from the Texas Instruments HCS logic family, housed in a 14-pin SOIC package. It operates within a supply voltage range of 2 V to 6 V and supports an ambient temperature range of –40°C to +125°C. The device features balanced CMOS push-pull outputs capable of ±7.8 mA drive current at 6 V. Key electrical parameters include a typical supply current of 100 nA, input leakage of ±100 nA, and propagation delays ranging from 7 ns to 42 ns depending on voltage and temperature.

Shift Registers Feature Summary

• Schmitt-trigger inputs provide high noise immunity and tolerance for slow signal transitions.
• AND-gated serial inputs (A and B) allow precise control over data entry into the shift register.
• Low power consumption with minimal static supply current and input leakage.
• Asynchronous clear function resets all registers to a low state immediately.

Shift Registers Applications

• Output expansion
• LED matrix control
• 7-segment display control
• 8-bit data storage

Shift Registers Procurement Notes

Verify the specific ordering suffix 'D' corresponds to the SOIC-14 package variant required for your design. Confirm that the component meets RoHS standards if applicable to your manufacturing process. Ensure the selected supplier provides valid traceability documentation. Cross-reference the manufacturer part number against official datasheets to confirm revision levels before finalizing procurement orders.

Shift Registers Selection Notes

Select this component when noisy environments require Schmitt-trigger input hysteresis to prevent erroneous switching. Choose the SN74HCS164DR for applications needing wide voltage operation between 2 V and 6 V. Consider its low static power consumption for battery-sensitive designs. Verify that the SOIC-14 package dimensions fit your PCB footprint constraints and thermal requirements.

Shift Registers Part Context

This device belongs to the SN74HCS series, which combines HCMOS speed with HC-level power consumption. The HCS family is designed for robust performance in electrically noisy industrial and consumer environments. The SN74HCS164 specifically addresses needs for serial-to-parallel conversion without complex communication interfaces, relying instead on simple GPIO clocking.

Shift Registers Replacement Considerations

Check for SN74HCS164PW or SN74HCS164BQA if different packages are needed. Verify pin compatibility with legacy SN74HC164 devices, noting potential differences in input thresholds and drive strength.

Shift Registers FAQ

How do the AND-gated serial inputs function?

Data enters the first flip-flop only when both Serial Input A and Serial Input B are high. If either input is low, the first stage is forced low upon the next clock pulse.

What is the purpose of the asynchronous clear input?

Applying a low signal to the CLR pin immediately resets all eight registers to a logical low state, regardless of the clock or serial input states.