AND (Chip)

The AND gate is a basic digital logic gate that implements logical conjunction. A 1 (high) output results only if all of the three inputs to the AND gate are 1 (high). If any of the inputs is 0 (low), a 0 (low) output results.

If no signal is connected to an input pin, the input is read as 1 (high). This is done by internal pull-up resistors that pull the signal to high in the absence of an input signal. Using this mechanism the AND gate can be used with 2 or 3 inputs in the exact same way.

Play with the 3 buttons to see the function of the AND gate. You will see that the output is only 1 (high) if all 3 inputs are 1 (high).