STMicroelectronics M74HC164M1R - 8-bit Serial-In Parallel-Out Shift Register

The M74HC164M1R is a high-speed CMOS 8-bit serial-in parallel-out shift register designed and manufactured by STMicroelectronics. This integrated circuit is part of the HC family, which ensures a balance between speed and power consumption, making it an ideal choice for a wide range of digital applications.

The device features two serial data inputs (A and B), eight parallel outputs (Q0 to Q7), a clock input (CP), and a reset input (MR). The M74HC164M1R operates with a supply voltage ranging from 2V to 6V, which allows for use in systems that require low power consumption and compatibility with TTL levels.

Its operation is straightforward: when the master reset (MR) input is held high, it clears the register, setting all outputs to a low level. When MR is low, data enters the register on the rising edge of the clock signal. The serial data is entered through input A or B; input B has a priority over A. As the clock signal is applied, data is shifted through the register, and new serial data can be entered simultaneously.

The M74HC164M1R's outputs can drive up to 10 LSTTL loads, which provides sufficient current for most applications. The high noise immunity of the CMOS technology, along with the latch-up performance, which exceeds 100mA per JESD 78, Class II, makes this device robust and reliable for industrial environments.

This device comes in a compact SO-14 package, which is surface-mountable and suitable for high-density PCB designs. The M74HC164M1R is widely used in serial-to-parallel data conversion, control systems, LED displays, and as an interface between microprocessors/microcontrollers and parallel input devices.

With its combination of features, the M74HC164M1R from STMicroelectronics is an excellent choice for designers looking to implement efficient data handling in their digital systems with minimal power draw and reliable performance.