M74HC166B1R

Shift Registers Overview

The M74HC166B1R is an 8-bit parallel-in serial-out (PISO) shift register fabricated with silicon gate C2MOS technology. It features a wide operating voltage range of 2V to 6V and operates within a temperature range of -55°C to +125°C. The device includes gated clock inputs, an overriding asynchronous clear input, and protection circuits against static discharge. It supports a maximum clock frequency of up to 63 MHz at 6V supply.

Shift Registers Feature Summary

• Parallel or serial data input modes controlled by the SHIFT/LOAD pin
• Asynchronous master reset input that overrides all other inputs including the clock
• Edge-triggered clocking on the low-to-high transition
• High noise immunity and symmetrical output impedance

Shift Registers Applications

• Data acquisition systems requiring serial conversion
• Microcontroller peripheral expansion for I/O extension
• Digital signal processing applications involving serial data streams
• Communication interface modules utilizing PISO functionality

Shift Registers Procurement Notes

Verify component authenticity through authorized STMicroelectronics distributors. Confirm package type matches DIP-16 requirements. Check RoHS compliance status as per latest datasheet revisions. Ensure storage conditions remain within specified limits prior to assembly.

Shift Registers Selection Notes

Select this component when an 8-bit PISO configuration is required with high-speed operation capabilities. Consider the wide voltage range suitability for various logic families. Evaluate thermal performance needs given the extended temperature rating. Verify pin compatibility with existing 74-series designs if migrating from older technologies.

Shift Registers Part Context

This part belongs to the M74HC166 family of high-speed CMOS logic devices. It serves as a functional equivalent to standard 74LS166 but offers improved speed and lower power consumption characteristics typical of HC series components. The B1R suffix indicates specific packaging and tape-and-reel options available for automated assembly processes.

Shift Registers Replacement Considerations

Direct substitutes include other 8-bit PISO shift registers from compatible logic families such as SN74LS166 or CD74HC166. Verify pinout compatibility and electrical specifications before substitution. Ensure replacement parts meet the same environmental and radiation hardness requirements if applicable.