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How many number of 2-input NAND gates are required to realise a half adder circuit?
  • a)
    5
  • b)
    6
  • c)
    4
  • d)
    8
Correct answer is option 'A'. Can you explain this answer?
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How many number of 2-input NAND gates are required to realise a half a...
Half Adder using NAND Gates:
The half adder can also be designed with the help of NAND gates. NAND gate is considered as a universal gate. A universal gate can be used for designing any digital circuitry. It is always simple and efficient to use the minimum number of gates in the designing process of our circuit. The minimum number of NAND gates required to design a half adder is 5.
  • The first NAND gate takes the inputs which are the two 1-bit numbers.
  • The resultant NAND-operated inputs will be again given as input to 3- NAND gates along with the original input. 
  • Out of these 3 NAND gates, 2-NAND gates will generate the output which will be given as input to the NAND gate connected at the end.
  • The gate connected at the end will generate the sum bit. Out of the 3 considered NAND gates, the third NAND gate will generate the carry bit.
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How many number of 2-input NAND gates are required to realise a half adder circuit?a)5b)6c)4d)8Correct answer is option 'A'. Can you explain this answer?
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