SN74LS165MR1

Shift Registers Overview

The SN74LS165MR1 is an 8-bit parallel-load shift register manufactured by ON Semiconductor. It features asynchronous parallel loading and serial shifting capabilities, with complementary outputs available from the final stage. The device utilizes low-power Schottky (LS) technology to ensure high-speed operation while maintaining reduced power consumption. It includes a clock input that supports OR-ing two independent clock sources or functioning as an active-low clock enable.

Shift Registers Feature Summary

• Asynchronous parallel load capability for immediate data entry
• Serial shifting operation triggered on the rising edge of the clock signal
• Complementary outputs provided from the last stage of the register

Shift Registers Applications

• Data conversion between parallel and serial formats in digital systems
• Expansion of I/O ports in microcontroller-based designs
• Input scanning for keyboard matrices or switch arrays

Shift Registers Procurement Notes

Verify the manufacturer marking matches ON Semiconductor specifications. Confirm the package type corresponds to the MR1 suffix requirements. Ensure the component meets the required logic family standards for your specific circuit design before integration.

Shift Registers Selection Notes

Select this component when an 8-bit parallel-to-serial converter is required with low-power Schottky characteristics. Consider the asynchronous load feature for applications needing immediate data capture. Verify voltage levels and clocking requirements match the system architecture.

Shift Registers Part Context

This part belongs to the SN74LS165 series of 8-bit shift registers. It is designed for general-purpose digital logic applications requiring reliable data shifting and storage. The LS technology ensures compatibility with standard TTL logic families while offering improved performance over older variants.

Shift Registers Replacement Considerations

Check for pin-compatible alternatives such as the SN74LS165AD or other manufacturers' equivalents like the MC14021B if voltage levels differ. Ensure functional equivalence regarding clock enable and parallel load operations.