Flip-Flop is a circuit which contains 2 outputs,one for normal value and other for opposite value or in simple words,it contains two states...
Flip-Flop is a circuit which contains 2 outputs,one for normal value and other for opposite value or in simple words,it contains two states i.e. 0 and 1.
Type of Flip-Flop:-
1)S-R Flip-Flop
2)J-K Flip-Flop
3)D Flip Flop
4)T Flip-Flop
S-R Flip Flop:-
S-R stands for Set-Reset,in which reset means "clear".We can construct S-R flip flop with or without clock.In which '1'=Set and '0'=Reset.
Block Diagram of S-R flop flop:-
Truth Table:-
PS-NS Table(or Present State-Next State):-
Excitation Table or Application Table:-
Characteristic Equation of S-R flip flop:-
Q(n+1)=Q(n)'SR'+Q(n)R'
=R'(Q(n)S+Q(n))
=R'(Q(n)+s)
=Q(n)R'+SR'
Circuit Diagram of S-R flip flop using NAND gate:-
Circuit Diagram of S-R flip flop using NOR gate:-
Type of Flip-Flop:-
1)S-R Flip-Flop
2)J-K Flip-Flop
3)D Flip Flop
4)T Flip-Flop
S-R Flip Flop:-
S-R stands for Set-Reset,in which reset means "clear".We can construct S-R flip flop with or without clock.In which '1'=Set and '0'=Reset.
Block Diagram of S-R flop flop:-
Truth Table:-
S | R | Q(n+1) | Q(n+1)' | Action |
---|---|---|---|---|
0 | 0 | Q(n) | Q(n)' | No Change |
0 | 1 | 0 | 1 | Reset |
1 | 0 | 1 | 0 | Set |
1 | 0 | X | X | Forbidden |
PS-NS Table(or Present State-Next State):-
Q(n) | S | R | Q(n+1) | Q(n+1)' | Action |
---|---|---|---|---|---|
0 | 0 | 0l | 0 | 1 | No Change |
0 | 0 | 1 | 0 | 1 | Reset |
0 | 1 | 0 | 1 | 0 | Set |
0 | 1 | 1 | X | X | Forbidden |
1 | 0 | 0 | 1 | 0 | No change |
1 | 0 | 1 | 0 | 1 | Reset |
1 | 1 | 0 | 1 | 0 | Set |
1 | 1 | 1 | X | X | Forbidden |
Excitation Table or Application Table:-
Q(n) | Q(n+1) | S | R |
---|---|---|---|
0 | 0 | 0 | X |
0 | 1 | 1 | 0 |
1 | 0 | 0 | 1 |
1 | 1 | X | 0 |
Characteristic Equation of S-R flip flop:-
Q(n+1)=Q(n)'SR'+Q(n)R'
=R'(Q(n)S+Q(n))
=R'(Q(n)+s)
=Q(n)R'+SR'
Circuit Diagram of S-R flip flop using NAND gate:-
Circuit Diagram of S-R flip flop using NOR gate:-
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nicely explained about SR Flip Flop
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