Nand gate - introduction to microprocessors , Electrical Engineering


NAND   means NOT AND  it complements  the output  of an AND  gate. The symbol  of NAND  by a NOT  gate.  Generally Not  operation  is represented by a bubble as shown  in figure  (b) truth  table of NAND  gate is  shown in figure.

If two  inputs  A  and B  are applied to NAND  gate output (Y)  gate output (Y)  is the complement  of the  product  of the  inputs. When all  the input  are  high the  output  is low . if  any one  or both  the input  are low  then the output  is high.

349_NAND Gate.PNG

                                     Figure (a) and (b)  symbol and (c) truth  table of  a two  input  NAND gate

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