If a three-input NAND gate has all inputs low, the output will be

If a three-input NAND gate has all inputs low, the output will be

• A. High
• B. Low
• C. Undefined
• D. Tri-state

Answer: (A)

A NAND gate outputs the opposite of the AND of its inputs. For three inputs, the output is NOT(A AND B AND C). If all inputs are low (0), A AND B AND C equals 0, and NOT 0 gives a high (1) output. So the signal will be high. The other conditions—low output, undefined, or tri-state—would require different input conditions or special circuit configurations, but with all inputs defined as low, the gate produces a high output.

A NAND gate outputs the opposite of the AND of its inputs. For three inputs, the output is NOT(A AND B AND C). If all inputs are low (0), A AND B AND C equals 0, and NOT 0 gives a high (1) output. So the signal will be high. The other conditions—low output, undefined, or tri-state—would require different input conditions or special circuit configurations, but with all inputs defined as low, the gate produces a high output.