The 74HC series chip is a series of CMOS logic integrated circuits. The characteristics of this series of chips are low power consumption, fast operating speed, TTL compatible input and output levels, high input impedance, good noise suppression performance, and wide operating temperature range. Therefore, the 74HC series chips have been widely used in digital systems and electronic devices. The 74HC series chips have multiple functions, including logic gates, latches, counters, selectors, multiplexers, dividers, and more. These chips with different functions can meet different application requirements.