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Digital ElectronicsFlip-Flops

A D flip-flop has D=Q̅ connected externally. Ignoring asynchronous controls, what behavior occurs on each active clock edge?

  • AIt toggles
  • BIt always resets
  • CIt always sets
  • DIt retains its state forever
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Correct Answer: A. It toggles
Explanation: Because the next D input is the complement of the current Q, each active edge loads the opposite state. The D flip-flop therefore behaves as a toggle element.
Reference: Standard digital electronics: D flip-flop feedback
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