Does the data inputs have any impact on the output of a multiplexer?

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sahanthuli

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In the first three entries of the truth table of a multiplexer whatever the value (0 or 1) of D0,D1,D2 it does not have any impact on the output because when the signals go through the AND gate the output of the it is 0 in the first three entries. Why am I wrong?

Let me explain with an example:

When D0 is 0, output (F) is equal to 0
When D0 is 1 still the output (F) is 0
So D0 is not equal to F (the output)

What am I missing here?




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There are two S inputs; S1 and S2. Each can have value 0 or 1. Total possible number that can be selected with these two select inputs is 4; these four possible inputs are given as D0, D1, D2 and D3.

Look at the truth table; S1S2 combination of 0,1,2 and 3 selects data lines D0,D1,D2 or D3.

Now go through the circuit given and work out step by step.

(D0 is not equal to F; rather F is equal to D0,D1,D2 or D3 depending on S1S2 equal to 0,1,2,3)
 

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