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It is required to design a (two -input) ...

It is required to design a (two -input) logic gate, using an appropriate number, of :
(a) NAND gates that gives a 'low' output only when both the inputs are 'low'.
(b) NOR gates that gives a 'high' output only when both the inputs are 'high'.
Draw the logic circuits for these two cases and write the truth table, corresponding to each of the two designs.

Text Solution

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(a) The 'NAND' gate that gives a 'low' output only when both its imputs are low, is an 'OR' gate. The required design and the truth table are as follow:

(b) The 'NOR' gate that gives a high output only when both inputs are high is an 'AND' gate. The required design and the truth table are as follow :
.
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