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Creating a latch circuit with logic gates

Discussion in 'General Electronics Discussion' started by Sadlercomfort, Apr 9, 2015.

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  1. Sadlercomfort

    Sadlercomfort Ash

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    Feb 9, 2013
    No it's an assignment, although It is a fun challenge. Otherwise I would of used a PIC microcontroller interfaced with a keypad and programmed it with assembly. Unfortunately its much more complicated than that.
     
  2. hevans1944

    hevans1944 Hop - AC8NS

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    Jun 21, 2012
    Well, I suppose you have to work within the constraints imposed by your customer (or worse, your boss). Maybe you can make a pitch for the PIC microcontroller + keypad idea, and if that is acceptable, save yourself a lot of time and effort.
     
  3. Sadlercomfort

    Sadlercomfort Ash

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    Feb 9, 2013
    I have to use circuitwizard sadly, but I've learnt alot of the experience and feel quite close to completing my assignment.

    Just need to get the bugs out. How do I make the JK's Q output, positve edge triggered rather than negative?
     
  4. hevans1944

    hevans1944 Hop - AC8NS

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    Jun 21, 2012
    Try the SN54AS109A series of positive edge-triggered J-K flip-flops. See attached data sheet. Note the K input is active low while the J input is active high. That means if you tie the two together it acts like a D-type flip-flop.
     

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