Digital Electronics - Combinational Logic Circuits - Discussion
Discussion Forum : Combinational Logic Circuits - General Questions (Q.No. 5)
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?
Discussion:
29 comments Page 2 of 3.
Dokhe said:
9 years ago
Because the D input out do the S input so the answer can be A, though the input is not enabled.
Jayant indLa said:
9 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"
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"
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.
GHC said:
9 years ago
Here, the device is not be enabled and MUX not enabled will give an output of logic 0 (low).
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.
Hari said:
1 decade ago
Without enabling the ic how can it gives the output. I am against the answer. If I am wrong then suggest me.
A.TEJASWINI said:
9 years ago
Can anyone tell me the correct answer for this question?
Aggression said:
10 years ago
If the device is not enabled, it should go in high impedance state which is denoted by "Z".
Chadrapaul said:
10 years ago
Please say correct answer.
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.
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