MM74HC165M

Shift Registers Overview

The MM74HC165M is an 8-bit parallel-in/serial-out shift register manufactured by onsemi (formerly Fairchild Semiconductor). It utilizes advanced silicon-gate CMOS technology to provide high-speed operation with low power consumption and high noise immunity. The device features a wide operating supply voltage range of 2V to 6V and can drive up to 10 LS-TTL loads. Data transfer occurs on the positive-going edge of the clock pulse, while parallel loading is controlled independently via the Shift/Load input. The component includes internal diode clamps for static discharge protection and offers complementary outputs.

Shift Registers Feature Summary

• Parallel-to-serial data conversion capability with independent serial input
• Gated clock input allowing for clock inhibit functionality
• Functionally and pinout compatible with standard 74LS logic family
• Internal input protection against static discharge damage

Shift Registers Applications

• Keyboard scanning systems
• Industrial control data acquisition
• Memory expansion interfaces
• General-purpose digital logic circuits

Shift Registers Procurement Notes

Verify the manufacturer origin, as this part was originally produced by Fairchild Semiconductor before its semiconductor business became onsemi. Confirm the package type matches the specific suffix (e.g., M for SOIC) required for the design. Ensure compliance with current RoHS directives and check for any lifecycle status changes or obsolescence notices from the current manufacturer.

Shift Registers Selection Notes

Select this component when an 8-bit parallel-to-serial converter is needed within the 74HC logic family. It is suitable for designs requiring compatibility with 74LS standards while benefiting from CMOS power efficiency. Consider the 2V to 6V supply range for flexibility in various voltage domains. Ensure the application does not require critical reliability standards that necessitate explicit written approval from the manufacturer.

Shift Registers Part Context

This device belongs to the 74HC series of high-speed CMOS logic integrated circuits. It serves as a fundamental building block for sequential logic applications where data serialization is required. The MM74HC165M specifically denotes the Small Outline Integrated Circuit (SOIC) package variant, distinguishing it from DIP, SOP, or TSSOP versions within the same logical family.

Shift Registers Replacement Considerations

• MM74HC165MTC
• MM74HC165SJ
• MM74HC165N

Shift Registers FAQ

How is parallel data loaded into the register?

Parallel data is loaded directly into the register when the Shift/Load input is taken LOW, independent of the clock state.

What happens if both clock inputs are held high?

Holding either of the clock inputs high inhibits clocking, preventing data shifting regardless of the other clock input's state.

Is the output complementary?

Yes, the device provides a complementary output from the eighth bit alongside the primary serial output.