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3 Answers

13 votes
13 votes

When the control input or enable input (E) is not active, the output is "Z", which means that no electrical current flows through. Hence it is in disconnected state .

Thus, even if x is 0 or 1, that current does not flow through .

hence, truth table is 

E(Enable) X(input) y(output)
0 0,1 Z(disconnected)
1 0 0
1 1 1
0 votes
0 votes

Buffer gives output , which it gets as input (with some delay)

Now, in tri state buffer

Enable input is 1 , it's circuit is closed state. Means when it gives input 0, get output as 0.

When enable input is 0, circuit is in open state. Means retains the last value when enable input was high

So, Ans C)

Answer:

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