SR Latch

Discussion in 'Homework Help' started by jwxie518, Sep 8, 2011.

  1. jwxie518

    Thread Starter New Member

    Oct 15, 2010
    4
    0
    Hi guys, A very simple question and hopefully someone can answer this :)

    The Q and notQ in SR-latch remembers the previous value of S and R, respectively, am I correct?

    Thank you very much!
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Yes, that is correct.

    When first powered on, Q and Q\ will be in an unknown state. There needs to be an input to S or R before the output will be in a known state.
     
  3. JDT

    Well-Known Member

    Feb 12, 2009
    658
    85
    In the classic NOR S-R latch, it's worth noting that /Q is not always the compliment of Q.

    When both inputs are high, both outputs will be low. If one input goes low followed by the other, the output remembers which was the last to go low.
     
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