GATE EE 2014 Set 3 — Question 61
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Analog & Digital Electronics → Digital Logic Circuits → Latches, Flip-Flops & Counters
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Question
A 3-bit gray counter is used to control the output of the multiplexer as shown in the figure. The initial state of the counter is . The output is pulled high. The output of the circuit follows the sequence
Correct answer
(A) I₀, 1, 1, I₁, I₃, 1, 1, I₂
Solution
From the figure: drives the active-low enable , drives and drives . When the MUX is disabled, its output floats and the pull-up resistor makes the output . When the output is .A 3-bit Gray counter starting at counts ():
The output sequence is .Answer: (A)
| Output | |||
|---|---|---|---|
| 000 | 0 | 00 | |
| 001 | 1 | – | 1 |
| 011 | 1 | – | 1 |
| 010 | 0 | 01 | |
| 110 | 0 | 11 | |
| 111 | 1 | – | 1 |
| 101 | 1 | – | 1 |
| 100 | 0 | 10 |
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