COMPUTER SCIENCE AND ENGINEERING
DIGITAL LOGIC
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Only if both inputs are high
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Only if both inputs are low
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Only if one input is high and the other is low
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If at least one of the inputs is low
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Detailed explanation-1: -REVIEW: Rule for an AND gate: output is “high” only if first input and second input are both “high.” Rule for an OR gate: output is “high” if input A or input B are “high.” Rule for a NAND gate: output is not “high” if both the first input and the second input are “high.”
Detailed explanation-2: -AND Gate: If both the inputs are high, it produces a high output.
Detailed explanation-3: -In digital electronics, a NAND gate (NOT-AND) is a logic gate which produces an output which is false only if all its inputs are true; thus its output is complement to that of an AND gate. A LOW (0) output results only if all the inputs to the gate are HIGH (1); if any input is LOW (0), a HIGH (1) output results.
Detailed explanation-4: -A 2 input logic gate which has always a high output when its inputs are the same is XNOR.