Ch11 - Latches d Fli Fl L t h and Flip-Flops Hasan Zidan...

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Latches and Flip-Flops Hasan Zidan Department of Electrical Engineering AUST 1
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Sequential Systems mbinational system a system whose utputs epend A combinational system is a system whose outputs depend only upon its current inputs. sequential system is a system whose outputs depends on the current inputs and the system’s current state . In other words, outputs depends not only on the present put but also on the past sequence of inputs input but also on the past sequence of inputs. All systems we have looked at to date have been combinational systems. 2
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Flip-Flops (FF)/ Latches atches nd Flip lops are devices that can have two Latches and Flip-Flops are devices that can have two internal states (0,1) The output of a latch or a Flip-Flop (FF) is dependent upon its CURRENT STATE and CURRENT INPUTS . Latches and FF’s are the simplest examples of sequential systems. y 3
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S et/ R eset Nor Latch ( SR Nor Latch) S R Ps Ns L Q Q H X L Present State S R Ps Ns H X L H X H H H X - Next State 0 0 Q Q 0 1 X 0 0 R Q 1 0 X 1 1 1 X - SQ R Q S Q plementation ymbol inputs, outputs high true. 4 Implementation Symbol inputs, outputs high true.
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S et/ R eset Nor gates Latch ( SR Nor Latch) SQ S R Ps Ns 0 0 Q Q 1 R Q 0 1 X 0 1 0 X 1 1 1 X - Not Allowed Operation Example: 5 Timing Diagram or (next state)
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Ch11 - Latches d Fli Fl L t h and Flip-Flops Hasan Zidan...

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