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Ready Trude EH
computer-science
electronics
notes
TrudeEH false false true Logic Gates

NOT

Invert the input.
!image42.png

Truth Table

Input Output
0 1
1 0

AND

Output 1 only when both inputs are 1.
!image43.png

Truth Table

A B Output
0 0 0
0 1 0
1 0 0
1 1 1

OR

Output 1 if at least one input is 1.
!image44.png

Truth Table

A B Output
0 0 0
0 1 1
1 0 1
1 1 1

NAND

An AND gate followed by a NOT gate.
!image45.png

Truth Table

A B Output
0 0 1
0 1 1
1 0 1
1 1 0

NOR

An OR gate followed by a NOT gate.
!image46.png

Truth Table

A B Output
0 0 1
0 1 0
1 0 0
1 1 0

XOR

Either input is 1, exclusively.
!image47.png
!image48.png

Truth Table

A B Output
0 0 0
0 1 1
1 0 1
1 1 0

XNOR

Inverted XOR.
!image49.png

Truth Table

A B Output
0 0 1
0 1 0
1 0 0
1 1 1

Implementation Examples

NOT

!image50.png

AND

!image51.png
!image52.png

OR

!image53.png