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Discussion

The terms "low speed" and "high speed," applied to logic circuits, refer to the ________.

  • A.rise time
  • B.fall time
  • C.propagation delay time
  • D.clock speed

Answer: C

Correct answer: propagation delay time

The speed of a logic family is measured by how long a change takes to travel from input to output, which is the propagation delay. Rise and fall times describe the edges of the signal, and clock speed is a property of the system rather than of the gate.

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