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Which of the following statements is wrong ?

  • A.Propagation delay is the time required for a gate to change its state
  • B.Noise immunity is the amount of noise which can be applied to the input of a gate without causing the gate to change state
  • C.Fan-in of a gate is always equal to fan-out of the same gate
  • D.Operating speed is the maximum frequency at which digital data can be applied to a gate

Answer: C

Correct answer: Fan-in of a gate is always equal to fan-out of the same gate

Fan-in is the number of inputs a gate has and fan-out the number of gate inputs its output can drive; the two are independent properties and there is no reason for them to be equal. The other three statements are the standard definitions of propagation delay, noise immunity and operating speed.

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