< Fundamental Digital Electronics  
        
      From previous chapters there are 8 fundamental Digital Logic Gates
Basic Logic Gates Symbol Mathematical Formula Truth Table Buffer 
Q = A A Q 
0 0
1 1NOT 
Q = NOT A A Q 
0 1
1 0AND 
AND GateQ = A . B A B Q 
0 0 0
0 1 0
1 0 0
1 1 1NAND 
AND GateQ = NOT(A . B) A B Q 
0 0 1
0 1 1
1 0 1
1 1 0OR 
Q = A + B A B Q 
0 0 0
0 1 1
1 0 1
1 1 1NOR 
Q = NOT(A + B) A B Q 
0 0 1
0 1 0
1 0 0
1 1 0XOR 
Q = A + B A B Q 
0 0 0
0 1 1
1 0 1
1 1 0XNOR 
Q = NOT(A + B) A B Q 
0 0 1
0 1 0
1 0 0
1 1 1
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