The 74HC164 is an 8-bit serial-in, parallel-out shift register that features an AND gate input and an asynchronous clear (CLR) function. This device allows data to be shifted into the register through its serial input and then output in parallel through eight output pins. The CLR pin can asynchronously reset all flip-flops in the register, setting their outputs to a low state regardless of the current clock or input conditions.
Input data is provided through two ports, A and B. If either of these ports is at a low logic level, the data from the other port is blocked, and the first flip-flop is set to a high state on the next clock pulse. When both A and B are high, the state of the flip-flop is determined by the data present on the other port. The device is triggered on the rising edge of the clock signal, meaning that data is sampled when the clock transitions from low to high. To ensure proper operation, the clock signal must meet the minimum settling time requirements before the next transition occurs.
The 74HC164 is commonly used in digital circuits for expanding I/O capabilities, especially when working with microcontrollers or other logic devices that require more output lines than available. Its simple operation and reliable performance make it a popular choice for applications such as LED displays, multiplexing, and data communication systems. Understanding how the A and B inputs interact with the clock and the internal flip-flops is essential for correctly implementing the device in your circuit design.
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