# Latch and flip flops two latches latch can be

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Latch and Flip-flops (two latches) Latch can be considered as a door CLK = 0, door is shut CLK = 1, door is unlocked A flip-flop is a two door entrance CLK = 1 CLK = 0 CLK = 1 23

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D Flip-Flop (Delay) D CLK Q Q’ Id D Q(t) Q(t+1) 0 0 0 0 1 0 1 0 2 1 0 1 3 1 1 1 Characteristic Expression Q(t+1) = D(t) 0 0 1 1 0 1 PS D 0 1 State table NS= Q(t+1) 24
JK F-F J CLK Q Q’ 0 0 0 1 ? 1 1 0 1 ? PS JK 00 01 10 11 State table Q(t+1) K 25

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JK F-F J CLK Q Q’ Characteristic Expression Q(t+1) = Q(t)K’(t)+Q’(t)J(t) 0 0 0 1 1 1 1 0 1 0 PS JK 00 01 10 11 State table Q(t+1) K 26
T CLK Q Q’ Characteristic Expression Q(t+1) = Q’(t)T(t) + Q(t)T’(t) 0 0 1 1 1 0 PS T 0 1 State table Q(t+1) T Flip-Flop (Toggle) 27

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Using a JK F-F to implement a D and T F-F J K Q Q’ D CLK D flip flop J K Q Q’ T CLK T flip flop 28
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• Fall '06
• Rosing
• Logic gate, CLK, Flip-flops, Flip-flop, Latch, Qprev

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