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Digital Electronics - Combinational Logic Circuits - Discussion

Discussion Forum : Combinational Logic Circuits - General Questions (Q.No. 5)
Combinational Logic Circuits
5.

For the device shown here, let all D inputs be LOW, both S inputs be HIGH, and the input be HIGH. What is the status of the Y output?

LOW
HIGH
Don't Care
Cannot be determined
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
28 comments Page 2 of 3.
Vikas said:   1 decade ago
An enable input makes the multiplexer operate. When EN = 0, the output is 0. When EN = 1, the multiplexer performs its operation depending on the selection line. In this case it is EN not.
Chadrapaul said:   10 years ago
Please say correct answer.
Aggression said:   10 years ago
If the device is not enabled, it should go in high impedance state which is denoted by "Z".
A.TEJASWINI said:   9 years ago
Can anyone tell me the correct answer for this question?
Ujjal said:   9 years ago
When ENABLE input is high, which means to disable the device.

So, Output may go into High Impedance, and the answer is option D.
Priyanka singh said:   9 years ago
We know that when enable pin is high then MUX will be operate but when enable pin is low then MUX willn't operate so option is incorrect.
GHC said:   9 years ago
Here, the device is not be enabled and MUX not enabled will give an output of logic 0 (low).
Vinay said:   9 years ago
As given input not able to enable the mux so it has any previous value either low or high, so according to me, its don't care.
Jayant indLa said:   8 years ago
In any combinational or sequential digital circuit if they have En then only the circuit gives proper output value otherwise it should stay at a previous value, another wise circuit will enter into the meta-stable state.
So, it should remain or hold the previous value until next En High.
Here previously we have s1s2 as 11 so, it should be enabled d3 = 0.
so, the answer is LOW "0"
Dokhe said:   8 years ago
Because the D input out do the S input so the answer can be A, though the input is not enabled.
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