Question

9. What device does this timing diagram represent: X х у N O O O A. D flip flop, edge triggered B. D latch, level triggered C please explain why each answer is correct or incorrect
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Answer #1

Solution:

Correct option is (A): D Flip Flop Edge Triggered

Explanation:

Assuming y as clock pulse and x as input ant z as output....

Since there is only one input...this means options D and E are eliminated because SR latches have two inputs....

Now Close observations shows that...

On the rising edge of of clock pulse y....

  • when the input x is high output z goes high
  • also when the input is low the output z goes low
  • falling edge has no effect on the output which means circuit is positive edge triggered
  • the device holds the value between two positive clock edges
  • hence the circuit edge triggered D Flip-Flop

As explained above since the circuit is edge triggered not level triggered. Hence options B is incorrect...

Also since clock is present...this means circuit is a Flip-Flop...hence option C is also incorrect

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