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Question about D Flip Flop

Discussion in 'General Electronics Discussion' started by dbeauch, Dec 27, 2013.

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  1. dbeauch


    Dec 27, 2013
    I have a question about a D flip-flop with with asynchronous clear and present (see attached image). Why does clear-bar have to go through the NAND gate with the data, D? Wouldn't it work without that?

    Attached Files:

  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    This is a master-slave flip-flop. If clear (or preset) were not connected to the slave (right 2 gates), you could reset (or set) the master, but the state of the slave would not change.
  3. dbeauch


    Dec 27, 2013
    I understand that, but I'm specifically asking about the clear-bar signal being sent through the NAND gate with the 'D' input. Why is that necessary? The preset-bar goes through only 2 NAND gates, but clear-bar goes through 3! Something seems strange about that.
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