3-17Figure 3-17. —D flip-flop with PR and CLR inputs.You may also see an inverter at the clock input. In this case, the output will change on the negative-going transition of the clock pulse.Q24.What are the inputs to a D FF?Q25.How long is data delayed by a D FF?Q26.What condition must occur to have a change in the output of a D FF?J-K FLIP-FLOPThe J-K FF is the most widely used FF because of its versatility. When properly used it may performthe function of an R-S, T, or D FF. The standard symbol for the J-K FF is shown in view A of figure 3-18.
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