Flip_Flops  Logic circuits are classified ito two groups  1. The combinational logic circuits,using the basic gates AND,OR and NOT.  2. Sequential.

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Presentation transcript:

Flip_Flops  Logic circuits are classified ito two groups  1. The combinational logic circuits,using the basic gates AND,OR and NOT.  2. Sequential logic circuits involving timing and memory devices.  The basic building block of the combinational logic circuits is the logic gates. The basic building block for sequential is the flip_flops

Logic ciorcuit for J-K FF

J-K Flip flop

The R-S Flip_flop using 2-OR gates

R-S Flip_flop using NOR Gate

The R-S Flip flop using NAND Gate

The truth table for R-S Flip- flop Q’QRS Previous state Prohibited state 11

The truth table for R-S flip_flop Effect on output Q Q’QRSMode of operation Prohibited_ Do not use 1100Prohibited For setting Q to Set For resetting Q to Reset Depends on previous state Q’Q11Hold

The clocked R-S Flip flop

The clocked RS Flip-flop

The clocked RS using AND and NOT logic gates

The clocked RS using NAND and AND gates

The T-FF

The logic symbol for the T_FF

The D- Flip-flop

The clocked RS-FF using NAND gates

The truth table for the clocked RS-FF Q’QRSCLK Previous state Prohibited state

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