74HC165

The 74HC165 is an 8-bit parallel-load shift register with a wide operating voltage range of 2.0V to 5.5V. When the shift/load input is LOW, eight parallel data inputs (A-H) are enabled and allowed to enter each stage. Data is shifted to a serial output when the device is clocked. The device also provides a complementary serial output.

When the shift/load input is HIGH and the clock inhibit input is LOW, the clock transition can be completed by a LOW-to-HIGH transition of the clock input. Due to the interchangeable function of the clock input and the clock inhibit input, the clock transition also can be completed by a low level of the clock input and a LOW-to-HIGH transition of the clock inhibit input. When the shift/load input remains HIGH, parallel load is inhibited. When the shift/load input remains LOW, parallel inputs enter the register, independent of other inputs.