1. Presented By:
Sunny Khatana
Computer Science Engg.
University Of Gujrat

2. What is Flip-flop?
SR Flip-flop
State table & Diagram
D Flip-flop
State table & Diagram
JK Flip-flop
State table & Diagram
T Flip-flop
State table & Diagram

3.  a flip-flop is a type of circuit that contains two
states and are often used to store state
information.
 By sending a signal to the flip-flop, the state can
be changed.
 Flip-flops are used in a number of
electronics, including computers and
communications equipment.
 There were a number of types of flip-flops are D
flip-flop, SR flip-flopT flip-flop and JK flip-flop.

4.  When the clock triggers, the value remembered by the flip-
flop remains unchanged if R and S are both 0, becomes 0 if
the R input (Reset) is 1, and becomes 1 if the S input (Set) is 1.
The behavior in unspecified if both inputs are 1. (In
Logical, the value in the flip-flop remains unchanged.)
 Characteristics Equation Q(next) = S + R'Q SR = 0
 Symbols & CharacteristicTable
S R Q
0 0 Q
0 1 0
1 0 1
1 1 ??

5.  The SR flip-flop state table.
 The state diagram is.
Q Q(next) S R
0 0 0 X
0 1 1 0
1 0 0 1
1 1 X 0

6.  When the clock triggers, the value
remembered by the flip-flop becomes the
value of the D input (Data) at that instant.
 Characteristic Equation Q(next) = D
 D Flip-flop symbol &
CharacteristicTable. D Q
0 0
1 1

7.  The D flip-flop has the following state table
▪ Note that changes on clock edge are always assumed
 The corresponding state diagram is
▪ Again, transitions occurs only on a clock edge.
Q Q(next) D
0 0 0
0 1 1
1 0 0
1 1 1

8.  When the clock triggers, the value
remembered by the flip-flop toggles if
the J and K inputs are both 1, remains the
same if they are both 0; if they are
different, then the value becomes 1 if
the J (Jump) input is 1 and 0 if the K (Kill) input
is 1
 Characteristic Equation Q(next) = JQ' + K'Q
 Symbol & Characteristic
Table
J K Q
0 0 Q
0 1 0
1 0 1
1 1 Q'

9.  The JK flip-flop state table
 The State Diagram is
Q Q(next) J K
0 0 0 X
0 1 1 X
1 0 X 1
1 1 X 0

10.  When the clock triggers, the value
remembered by the flip-flop either toggles or
remains the same depending on whether
the T input (Toggle) is 1 or 0.
 Characteristic Equation Q(next) =TQ' +T'Q
 Symbols & Characteristic
Equation
T Q
0 Q
1 Q'

11.  TheT flip-flop state table
 The State Diagram is
Q Q(next) T
0 0 0
0 1 1
1 0 1
1 1 0