Monday, August 1, 2011

Universal Gate NOR




Summery
Earlier we have mentioned about the universal logic gate NAND. Now we will try to discuss about another logic gate NOR. It is just opposite to the OR gate. Like universal gate NAND, NOR gate can also be used to design of various logic gates. In this topic we will see the implementation of various logic gates with NOR gate. And we will also observe the verification of truth tables of those logic gates.
Normally to do this quad-2 input NOR gate (HD74HC02P) is used. The output is taken from the LED (Light Emitting Diode). One thing that should be noted that,  DC power supply must be equal to or less than +5V. Because otherwise, there is a chance to damage of the IC. 

Implementation with NOR gate
OR Gate

Truth Table


        Input A
      Input B
    Output Q
             0
         0
          0
             0
         1
          1
          1
         0
          1
          1
         1
          1
     Figure: Truth Table of NOR Implementation of OR Gate
Circuit Diagram

 




INVERTER Gate

Truth Table

 
       Input A
      Output Y
           0
            1
           1
            0









 Figure: Truth Table of NOR Implementation of Inverter Gate


Circuit Diagram

 




AND Gate

Truth Table


      Input A
      Input B
       Output Q
        0
         0
          0
        0
         1
          0
        1
         0
          0
           1
         1
              1

       Figure: Truth Table of NOR Implementation of AND Gate


Circuit Diagram






NAND Gate


Truth Table

      Input A
      Input B
      Output Q
         0
        0
         1
         0
        1
         1
         1
           0
         1
         1
        1
         0

        Figure: Truth Table of NOR Implementation of NAND Gate

Circuit Diagram

 







Exclusive-NOR Gate

Truth Table

      Input A
     Input B
     Output Q
        0
        0
       1
        0
        1
       0
        1
        0
       0
        1
        1
       1

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