Digital Electronics - Combinational Logic Circuits - Discussion
Discussion Forum : Combinational Logic Circuits - General Questions (Q.No. 16)
16.
For the device shown here, assume the D input is LOW, both S inputs are HIGH, and the 
input is HIGH. What is the status of the 
outputs?
All are HIGH.
All are LOW.
All but 
are LOW.
are LOW.All but 
are HIGH.
are HIGH.Discussion:
10 comments Page 1 of 1.
Alex said:
4 months ago
Both S inputs are HIGH, which means output is reflected at y3.
Samaina said:
6 years ago
Yes, you are right @Shreashi.
Rachit said:
8 years ago
This is a demultiplexer. When S0 and S1 are both 0, output would be D000. That implies 0000, but since we have inverters present at the outputs the answer gets inverted and we get 1111.
(1)
Shreashi said:
8 years ago
EN' input is high. But since it is complement it will be low. And since all the outputs are in complemented form low input will become high. So Y' is high.
(1)
Surya said:
8 years ago
If enable input is high then it is not enabled. And how we tell output is high?
(1)
Dhana said:
1 decade ago
For a given MUX, EN i/p is active low i.e, MUX is active if and only if EN=0, but they given EN=1, so MUX is in disable condition.
The resultant o/p is all zeros. But o/p is inverted, so o/p is all ones.
The resultant o/p is all zeros. But o/p is inverted, so o/p is all ones.
(2)
Rupesh9292 said:
1 decade ago
Still didn't get it clearly please elaborate. En=1 o/p=1. It's all o/p=1 en=0 o/p=0 means all o/p=0 how came? If o/p condition is 1010 then what is i/p?
Hiren said:
1 decade ago
Answer is High because, Output of Demax is Inverted.
So when Output cames 0 it gets inverted So. Ultimately It is all High is answer.
So when Output cames 0 it gets inverted So. Ultimately It is all High is answer.
Prakul said:
1 decade ago
High impedence because we are providing HIGH to EN input. EN pin is active low enable pin. If we set it as HIGH, the outputs will be in high impedence state.
(1)
Samir said:
1 decade ago
High impedance.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers