Latches, Flip-Flop and Pewaktu (Timer)

Latches (Definitation)

The output of a latch depends on its current inputs and on its previous output and its change of state can happen at any time when its inputs change

·       S-R (Set-Reset) Latch

·       Gated S-R Latch

·       Gated D Latch

S-R Latch Active-HIGH Input S-R Latch







S-R Latch Active-LOW Input S-R Latch







Truth Table for Gated S-R Latch









Edge – Triggered Flip-Flops

·       Edge -triggered S-R Flip-Flop








·     Edge -triggered D flip-flop









·       Edge – triggered J-K flip-flop









Asynchronous Preset and Clear Inputs

The state of the flip-flop independent of the clock. These preset and clear inputs must both be kept HIGH for synchronous operation.







Flip-flop aplications

·       Paralel Data Storage

·       Frequency Division

·       Counting


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