The AND gate, which is composed of two or more inputs and a single output, performs logical multiplication. The standard symbol for the AND gate is shown in Figure 1-3 and its truth table listed in Table 1-2. The logical operation of the AND gate is such that the output is HIGH (1) when all the inputs are HIGH, otherwise it is LOW (0). The Venn diagram shown in Figure 1-4 provides an insight into the AND function. The highlighted area represents the function X=AB.
Figure 1-3 Standard Logic Symbol for AND gate
Figure 1-4 Venn diagram illustrating AND operation
INPUT |
OUTPUT |
|
A |
B |
|
0 |
0 |
0 |
0 |
1 |
0 |
1 |
0 |
0 |
1 |
1 |
1 |
Table 1-2 Truth table for AND gate
