Computer Science - Digital Computer Electronics - Discussion


The number of two-input NAND gates required to produce the two-input OR function is

[A]. 1
[B]. 2
[C]. 3
[D]. 4
[E]. None of the above

Answer: Option C


No answer description available for this question.

Mint said: (May 13, 2011)  
It should be 1 actually.

Mayank said: (Sep 26, 2015)  
No It would be 3, Because the output 1 NAND gate is X'+Y'. So it requires more than 1 NAND gate.

In this we gave 2 inputs suppose X, Y to the first NAND and we get X'+Y'.

Again in second NAND we get X'+Y'.

These two outputs fed to the input of third NAND and the output is ((X'+y').(x'+y'))'.

After minimize it we got OR output as X+Y.

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