Consider the following statements regarding digital logic systems and and select the correct
Consider the following statements regarding digital logic systems and and select the correct
statements.
P. The output of the n inputs NAND gate is 0 when all the n inputs values are 1’s.
Q. The output of the n inputs NAND gate is 1 when all the n inputs values are 0’s.
R. The output of the n inputs NAND gate is 1 when all the n inputs values are 1’s.
S. Minimum three NAND gates are used to implement the given three variable Boolean
function F (A, B, C) = AB +BC using only NAND logic gates.
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Correct answer: (A) Only P, Q and S
Explanation
A NAND gate gives 0 only when all inputs are 1, so P and Q are true and R is false. AB + BC = ((AB)'·(BC)')' needs three NAND gates, so S is true.