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RS Flip Flop with Clock Pulse

Discussion in 'General Electronics Discussion' started by pulp_fiction, Oct 27, 2013.

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  1. pulp_fiction

    pulp_fiction

    1
    0
    Oct 27, 2013
    Hi I am a noob in electronics and I recently found this Electronics forum.
    This is gonna be my first post.

    So, I have a doubt concerning the RS Flip Flop.
    Why don't we consider the clock as an input in the characteristic table as like C with 0 1 0 1 0 1.... .I mean why the characteristic equation doesn't include clock C ?

    And I have a question in general that-How do we select what is input for any complex circuit?

    Btw: RS flip flop circuit and table are attached.
     

    Attached Files:

  2. Laplace

    Laplace

    1,252
    184
    Apr 4, 2010
    When you add clocked flip-flops to a logic circuit, it changes from simple gate logic to a synchronous state machine. The state at any time 't' is given by the value of all the flip-flop outputs, Q(t). The clock is implied by the 't+1' where Q(t+1) shows the new state after the clock pulse. That is why the characteristic table is also called the state transition table.

    If an external signal can affect the state transition, then that is a good reason to select it as an input for the state machine.
     
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