The 74HC165D is a popular integrated circuit (IC) component that belongs to the 74HC series of high-speed CMOS logic devices. It is specifically designed as an 8-bit serial-in and parallel-out shift register, commonly used for input shift-register applications. Here is an overview of its key features:
1. Serial-in, Parallel-out: The 74HC165D IC has a serial input pin (SER) that allows data to be shifted in bit by bit. It can handle 8 bits of serial data.
2. Parallel Outputs: The IC has 8 parallel output pins (Q0-Q7) that provide the stored data in a parallel format. These pins can be easily connected to other components or microcontrollers, simplifying data processing.
3. Cascade Capability: The IC supports cascading, which means multiple 74HC165D chips can be connected together to increase the number of inputs without requiring extra pins on the microcontroller. This is achieved by connecting the serial output (Q7) of one chip to the serial input (SER) of the next chip.
4. Synchronous Operation: The IC operates synchronously, meaning it relies on a clock signal to control the shifting of data. A positive edge-triggered clock input (CLK) controls the timing of data transfer.
5. Integrated Debouncing: The 74HC165D includes a debounce circuit that reduces signal noise or electrical glitches from mechanical switches or buttons
