RFL Electronics GARD 8000 - Figure 8-2. Three Input and Gate

System Logic
GARD 8000 SYS RFL Electronics
March 26, 2008 8-2 973.334.3100
8.2.2 THREE INPUT AND GATE
A three input AND gate has three inputs and one output, as shown in Figure 8-2. If all three inputs are
true, the output is true. If any inputs are false, the output is false.
Table 8-2. Truth table for Three Input AND gate
INPUT 1
INPUT 3
OUTPUT
Input 1
Input 2
Output
False
True
True
False
False
True
True
False
False
False
False
True
INPUT 2
Input 3
False
False
False
False
False
False False
False
True
True
True
False
True
True True
True
False
False
True False
Figure 8-2. Three input AND gate
8.2.3 TWO INPUT OR GATE
A two input OR gate has two inputs and one output, as shown in Figure 8-3. If both inputs are false,
the output is false. If either input is true, the output is true.
Table 8-3. Truth table for Two Input OR gate
INPUT 1
INPUT 2
OUTPUT
Input 1
Input 2 Output
False
True
True
False
False
True
True
False
False
True
True
True
Figure 8-3. Two Input OR gate