J-K flip flops are a bit more complicated than shown in other threads. Often simplified as a clocked S-R latch it doesn't explain all the operation of the J-K flip flop. Design 505 A, attached, shows a Clock latch (transparent latch). Design 505B shows a J-K positive edge triggered latch. Design 506 shows a J-K Master / Slave design. All are simplified and don't accurately represent any specific IC. "J" and "K" being the initials of the designer, John Kardash (according to legend),
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