Elenco Understanding Logic Gates - Manual (Page 9)

U16
AND Gate
AND gates are used in digital logic circuits to perform a logical multiply. When one of the inputs is low (0),
the output is low (i.e. multiply by 0). The output will only be high (1) when both inputs are high.
A
Q
B
1
1
1
1
1
2
2 2 2
2
2
2
This circuit demonstrates how the AND Gate
(U16) works. Connect one end of the red and
black jumper wires to the A & B inputs on U16
and the loose ends to either low voltage
(denoted as a “0”) or high voltage (denoted as
a “1”). If, and only if, both input A
AND input
B are high (both 1s, both gree LEDs on), then
the Q output on U16 will be high (1), and the
red LED (D1) will be on.
The output of an AND gate is often
represented as the product of the inputs,
so Q = AB .
Input (A) Input (B) Output (Q)
0 0 0
0 1 0
1 0 0
1 1 1
0