SR Latch confirmation needed

Discussion in 'Homework Help' started by Kaiser, Dec 1, 2008.

  1. Kaiser

    Thread Starter New Member

    Sep 18, 2007
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    0
    in an SR latch, S=1, R=0 so Q=1 Q'=0, then S=0, R=0 and since that's the "latch" state, Q=1 and Q'=0 right? the S=0 and R=0 just means that Q and Q' stay unchanged or does it reset to it's initial state?

    I did indeed read http://www.allaboutcircuits.com/vol_4/chpt_10/2.html before I posted this, just wanting to make sure I understand it.
     
    Last edited: Dec 1, 2008
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    If you are talking about a NOR gate RS latch, if R=0 and S=0 then Q and Q' stays unchanged (holds the previous value). For a NAND gate RS latch things work a bit different.

    Have a look here, it will help you:

    http://www.play-hookey.com/digital/rs_nor_latch.html

    You can click on the blue squares on the latch inputs and play with it.
     
  3. Kaiser

    Thread Starter New Member

    Sep 18, 2007
    6
    0
    Ah, thank you very much :D
     
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