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Quick Reference - Logic Gates

This page provides a quick reference for the basic gates that you will be using throughout this course. In the table below, each gate is named, has its schematic symbol, and associated truth table.


Name Symbol Truth Table Pins The Rule
NOT
A
Y
0
1
1
0
1 If the input is a '1' then output a '0'
If the input is a '0' then output a '1'
AND
BA
Y
00
01
10
11
0
0
0
1
Any If all inputs are a '1' then output a '1'
otherwise output a '0'
OR
BA
Y
00
01
10
11
0
1
1
1
Any If all inputs are a '0' then output a '0'
otherwise output a '1'
XOR
BA
Y
00
01
10
11
0
1
1
0
Even If an odd number of inputs are a '1' then output a '1'
otherwise output a '0'
NAND
BA
Y
00
01
10
11
1
1
1
0
Any If all inputs are a '1' then output a '0'
otherwise output a '1'
NOR
BA
Y
00
01
10
11
1
0
0
0
Any If all inputs are a '0' then output a '1'
otherwise output a '0'
XNOR
BA
Y
00
01
10
11
1
0
0
1
Even If an even number of inputs are a '1' then output a '1'
otherwise output a '0'
Last Modified: - Barry E. Mapen