Question 10071 – Digital-Logic-Design
February 13, 2024GATE 1990
February 13, 2024GATE 1990
| Question 9 |
Choose the correct alternatives (More than one may be correct).
Two NAND gates having open collector outputs are tied together as shown in below figure.
The logic function Y, implemented by the circuit is,
| Y = ABC + DE | |
 | |
| Y = ABC . DE | |
 | |
| Both (C) and (D) |
Question 9 Explanation:
There should be bubbled connection between two gates
Y = ((ABC)’ + (DE)’)’
Y = ABC . DE
Note: Open gate works as NOR gate.
Y = ((ABC)’ + (DE)’)’
Y = ABC . DE
Note: Open gate works as NOR gate.
Correct Answer: E
Question 9 Explanation:
There should be bubbled connection between two gates
Y = ((ABC)’ + (DE)’)’
Y = ABC . DE
Note: Open gate works as NOR gate.
Y = ((ABC)’ + (DE)’)’
Y = ABC . DE
Note: Open gate works as NOR gate.