NAND gate
 

This is a NOT-AND gate which is equal to an AND gate followed by a NOT gate. 

 

The outputs of all NAND gates are high if any of the inputs are low.  

 

Symbol for NAND Gate

The symbol is an AND gate with a small circle on the output. The small circle represents inversion.

 


 

 

Truth Table for NAND Gate

This is an AND gate with the output inverted, as shown by the 'o' on the output.
The output is true if input A AND input B are NOT both true: Q = NOT (A AND B)
A NAND gate can have two or more inputs, its output is true if NOT all inputs are true. 

 





















A B A.B
0 0 1
0 1 1
1 0 1
1 1 0

 

 

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