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Ms.M.Jancypriya, Assistant Professor, Department of BCA, Bon Secours College, Thanjavur, Tamilnadu, India
FLIP-FLOP

Sequential Circuits
• The output of circuit depends on the previous
output and the present inputs.
• The inputs must follow a specific sequence to
produce a required output.
• Most sequential systems are based on a small
number of simple sequential circuit elements
known as Bistables or Flip Flops.

Flip-Flop
• In digital circuits, the flip-flop, is a kind of
bistable multivibrator.
• It is a Sequential Circuits / an electronic circuit
which has two stable states and thereby is capable
of serving as one bit of memory , bit 1 or bit 0.

FLIP-FLOP
• Flip-flop have two stable conditions and can be
switched from one to the other by appropriate inputs.
These stable conditions are usually called the states
of the circuit.
• They are 1 (HIGH) or 0 (LOW) Whenever we refer
to the state of flip flop, we refer to the state of its
normal output (Q).
• More complicated Flip flop use a clock as the
control input. These clocked flip-flops are used
whenever the input and output signals must occur
within a particular sequence.

Types of Flip-Flop
 SR Flip Flop
 JK Flip Flop
 T Flip Flop
 D Flip Flop

Uses of Flip-Flop
• For Memory circuits
• For Logic Control Devices
• For Counter Devices
• Register Devices

SR Flip-Flop
• The most basic Flip Flop is called SR Flip Flop.
• The basic RS flip flop is an asynchronous device.
• In asynchronous device, the outputs is immediately
changed anytime one or more of the inputs change
just as in combinational logic circuits.
• It does not operate in step with a clock or timing.
• These basic Flip Flop circuit can be constructed using
two NAND gates latch or two NOR gates latch.
• SR Flip Flop Active Low = NAND gates
• SR Flip Flop Active High = NOR gates

Continued…
• The SR Flip Flop has two
inputs, SET (S) and RESET
(R).
• The SR Flip Flop has two
outputs, Q and Q’
• The Q output is considered
the normal output and is the
one most used.
• The other output Q’ is
simply the compliment of
output Q.

Truth Table

JK FLIP FLOP
DIAGRAM

JK Flip Flop Truth Table

T Flip Flop
The T flip flop has only the Toggle and Hold Operation.
• If Toggle mode operation. The output will toggle from 1
to 0 or vice versa

D Flip Flop
• Known as Data Flip flop
• Can be constructed from RS Flip Flop or JK Flip
flop by addition of an inverter.
• Inverter is connected so that the R input is always
the inverse of S (or J input is always
complementary of K).
• The D flip flop will act as a storage element for a
single binary digit (Bit).

Truth Table and Diagram

Thank you….

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Flip Flop and Its Types

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Flip Flop and Its Types