Digital Electronics - Logic Gates - Discussion


How many inputs of a four-input AND gate must be HIGH in order for the output of the logic gate to go HIGH?

[A]. any one of the inputs
[B]. any two of the inputs
[C]. any three of the inputs
[D]. all four inputs

Answer: Option D


No answer description available for this question.

Vadivel said: (Jun 14, 2011)  
The and gate output will be HIGH only when all the inputs are HIGH.

Anamika said: (Nov 1, 2015)  
Yes D is right option. If any of the input is low then output goes low so it is necessary that all input (four input) must be high.

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