SN74LS165ANSR

Shift Registers Overview

The SN74LS165ANSR is an 8-bit parallel-load shift register from the Texas Instruments SN74LS series. It converts parallel data inputs into a serial output stream, featuring asynchronous serial input and parallel load capabilities. The device operates within a supply voltage range of 4.75 V to 5.25 V and exhibits a propagation delay of 25 ns. Designed for commercial applications, it functions reliably between 0°C and +70°C. The component utilizes bipolar logic technology and is housed in a surface-mount SOIC-16 package.

Shift Registers Feature Summary

• Asynchronous parallel loading capability allows immediate data capture independent of clock signals.
• Serial cascading functionality enables connection of multiple units for expanded bit-width operations.
• Bipolar LS logic construction provides defined switching characteristics for standard digital interfaces.

Shift Registers Applications

• Digital input expansion for microcontroller systems requiring additional parallel ports.
• Keyboard matrix scanning circuits for detecting key press states.
• Data acquisition systems converting sensor arrays to serial streams.

Shift Registers Procurement Notes

Verify the specific suffix 'SR' indicates reel or cut-tape packaging configuration upon ordering. Confirm that the SN74LS family designation aligns with system power and speed requirements. Ensure compatibility with existing 5V logic levels before integration. Cross-reference manufacturer documentation for any recent pinout or electrical specification updates.

Shift Registers Selection Notes

Select this component when bipolar LS speed and drive strength are required over CMOS alternatives. Consider the SOIC-16 package constraints for PCB layout density. Evaluate the 25 ns propagation delay against system timing budgets. Verify that the 4.75 V to 5.25 V operating range matches the target power supply stability.

Shift Registers Part Context

This part belongs to the widely adopted SN74LS165 family of 8-bit shift registers. It serves as a standard interface solution for bridging parallel peripherals to serial communication buses. The LS variant offers a balance of speed and power consumption suitable for general-purpose digital logic applications.

Shift Registers Replacement Considerations

SN74LS165N (PDIP version), SN74HC165DR (CMOS upgrade). Verify voltage tolerance and package footprint differences before substitution.