flip flops WORKING

2. UNIT IV: DIGITAL SEQUENTIAL CIRCUITS
TOPIC: FILP-FLOPS
E.M.G. YADAVA WOMEN’S COLLEGE, MADURAI – 625 014.
(An Autonomous Institution – Affiliated to Madurai Kamaraj University)
Re-accredited (3rd Cycle) with Grade A+ and CGPA 3.51 by NAAC
By
Mrs. M.R. Gurulakshmi,
Department of physics,

3. What is electronics?
 The branch of physics and technology concerned with the
design of circuits using transistors and microchips, and
with the behaviour and movement of electrons in a
semiconductor, conductor, vacuum, or gas.

4. What is filp-flops?
 Flip-flop or latch is a circuit that has two stable states and can
be used to store state information – a bistable multivibrator.
 The circuit can be made to change state by signals applied to
one or more control inputs and will have one or two outputs.
 the basic storage element in sequential logic.
 Flip-flops and latches are fundamental building blocks
of digital electronics systems used in computers,
communications, and many other types of systems.

5.  Flip-flops and latches are used as data storage elements.
 A flip-flop is a device which stores a single bit (binary digit) of
data; one of its two states represents a "one" and the other
represents a "zero".
 Such data storage can be used for storage of state, and such a
circuit is described as sequential logic in electronics. When used
in a finite-state machine, the output and next state depend not
only on its current input, but also on its current state (and hence,
previous inputs).
 It can also be used for counting of pulses, and for synchronizing
variably-timed input signals to some reference timing signal

7. TYPES OF FILP-FLOPS:
 RS Flip-Flop
 D Flip-Flop
 JK Flip-Flop
 T Flip-Flop

8. RS FILP-FLOPS:
 There are two inputs to the filp flop defind as R and S.
 RS flip-flop operates with only positive clock transitions
or negative clock transitions.
The circuit diagram of SR flip-flop is shown in the
following figure.

13. Clocked RS Flip-flops
 The flip flop in order to store information at any tie and
then hold the stored information for any desired period of
time.
 This is called gated or clocked RS Flip flops.

16. Clocked D flip-flops
 D flip-flop operates with only positive clock transitions or
negative clock transitions.
 D latch operates with enable signal.
 That means, the output of D flip-flop is insensitive to the
changes in the input, D except for active transition of the clock
signal.
 The circuit diagram of D flip-flop is shown in the following
figure.

19. References
 Donald Mavino .A ,Leach .P, Saha Gautam, Digital
Principles and applications, Tata Mc Graw hill, New Delhi,
Sixth Edition, 2002. [UNITS: IV, V]
 2. Malvino .A.P, Electronic Principles, Tata Mc Graw Hill,
New Delhi, Seventh Edition, 2002. [UNITS: I, II, III]
 3. Jose Robin .G, Ubaldraj .A, Analog electronics and Digital
Electronics, Indira Publications, Marthandam, First
Edition, 2008.
 4. Rohit Mehtha, V.K. Mehtha, Principles of electronics, S.
Chand And company Ltd, New Delhi, Eleventh
Edition,2012
 5. Santhiram Kal, Basic Electronics, Devices circuits and IT
fundamentals, PHI Learning Private Learning, New Delhi,
First Edition, 2010.