Boolean Expression for NAND GateMediumQuestion 20252
Question
A two-input NAND gate can be used as a NOT gate by:
- AConnecting inputs to different signals
- BConnecting both inputs together to the same signalCorrect
- CLeaving one input at HIGH
- DLeaving one input at LOW
Correct answer
Connecting both inputs together to the same signal
Explanation
NAND with both inputs tied to A: Y = (A·A)̄ = Ā. This creates a NOT gate using only a NAND gate, demonstrating universality. Similarly, NOR with both inputs tied: Y = (A+A)̄ = Ā.