Discussion
Which logic function has the output low only when both inputs are high ?
Answer: D
The logic function whose output is low only when both inputs are high is NAND.
A NAND gate is an AND gate followed by an inverter, so it gives 0 only for the input 1 1 and gives 1 for all the other three input combinations.
AND gives high only when both inputs are high, OR gives low only when both inputs are low, and NOR gives high only when both inputs are low.
Its truth table is 00 gives 1, 01 gives 1, 10 gives 1 and 11 gives 0. A NAND is also a universal gate, since any other gate can be built from NAND gates alone, which is why it is so common in integrated circuits.
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