< Digital Electronics < Logic Gates
Combination gates
More than one logic gates can be connected to produce new logic gates
Buffer
Basic Logic Gates Combinational Gates Symbol Mathmatical Formula Truth Table Buffer 
Y = is NOT NOT A
Y = AA Q
0 0
1 1
NOT Gate
Digital Gate Combinational Gates Symbol Mathematical Expression Truth Table NOT Gate Y = is NOT A A Y
0 1
1 0
NAND Gate
Digital Gate Combinational Gate Symbol Mathematical Expression Truth Table Buffer 
Y = is NOT A.B A B Y
0 0 1
0 1 1
1 0 1
1 1 0
NOR Gate
Digital Gate Combinational Gate Symbol Mathematical Expression Truth Table NOT 
Y = is NOT A+B A B Y
0 0 1
0 1 0
1 0 0
1 1 0
XNOR Gate
Basic Gates Combinational Gate Symbol Mathematical Formula Truth Table NOT Gate 
Y = is NOT AxorB A B Q
0 0 1
0 1 0
1 0 0
1 1 1
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