STMicroelectronics M74HC165M1R 8-bit Parallel-In/Serial-Out Shift Register

The M74HC165M1R is a high-speed CMOS 8-bit parallel-in/serial-out shift register designed and manufactured by STMicroelectronics. This integrated circuit is part of the HC family, which is well-known for its robust performance and compatibility with TTL (Transistor-Transistor Logic) counterparts. The M74HC165M1R is engineered to handle a wide range of applications that require the conversion of parallel data into a serial format, making it an ideal choice for simplifying the interface between microprocessors and their peripherals.

One of the key features of the M74HC165M1R is its two modes of operation: Hold (do nothing) and Shift. The hold operation is enabled by a high level at the SH/!LD input, allowing the device to retain the data in the holding register. When the SH/!LD input is low, the parallel inputs to the register are enabled, and the device shifts the data on the rising edge of the clock CP. This flexibility allows for precise control over data manipulation within a system.

The device also includes an asynchronous master reset (MR) input that, when taken high, resets the shift register. This feature is particularly useful for initializing the register during power-up sequences or when there is a need to quickly clear the register's contents.

With a wide operating voltage range from 2V to 6V, the M74HC165M1R accommodates various logic levels, making it suitable for interfacing with both CMOS and LSTTL devices. Additionally, its low power consumption and high noise immunity are inherent to CMOS technology, ensuring reliable operation even in electrically noisy environments.

The M74HC165M1R comes in a compact SO-16 package, which is conducive for space-constrained applications. It is also characterized for operation from -55°C to +125°C, making it robust enough to be used in a wide range of industrial and automotive environments where temperature extremes are common.

In summary, the M74HC165M1R from STMicroelectronics is a versatile and reliable component for digital systems requiring efficient data serialization. With its dual-mode operation, master reset function, and compatibility with multiple logic standards, it is an excellent choice for system designers looking to optimize their data handling capabilities.