This document discusses sequential logic circuits and various types of flip-flops. It describes how sequential logic circuits add memory elements to combinational circuits to create feedback paths. It then defines and explains common types of flip-flops like RS, D, JK, T, and master-slave flip-flops. Finally, it discusses applications of flip-flops like counters, state diagrams, and shift registers.

1. unit-v
sequentiaL logic circuit
PRESENTED BY
G.Vinothini M.sc.,M.phil.,
Department of Information Techonology,
Bon Secours College for Women,
Thanjavur.

2. A Sequential logic circuit consists of a
combinational circuit to which memory elements
have been added to form a feedback path.

3. FLIP FLOP
A flip-flop circuit can maintain a binary state in
definitely until directed by an input signal to
switch states.

4. RS FLIP-FLOP
One of the simplest storage device is the reset-set(RS)
flip-flop which can be constructed using to NAND
gates or two NOR gates.

5. CLOCKED RS FLIP-FLOP
The basic flip flop as we can seen is an asynchronous
sequential circuit.it can however , be redesigned to
respond to R and S inputs during the occurrence of a
clock pulse.

6. D FLIP-FLOP
The D Flip-flop allows the value of D to reach the output
only when a clock pulse occurs and prevents the value of
D to reach the output when there is no clock pulse.

7. JK FLIP-FLOP
The JK flip-flop is the improved version of the RS flip-
flop . The reason for the improvement being that the
indeterminate state of the RS flip-flop gets defined in
the JK type flip-flop.

8. T FLIP-FLOP
The T Flip-flop is a single-input version of the JK flip-
flop .The flip-flop is derived from the JK type when
both J and K inputs are tied together.

9. MASTER SLAVE FLIP-FLOP
A master slave flip-flop is constructed from separate
flip-flop . One circuit serves as a master and the other
as a slave , and the overall circuit is referred to as a
master-slave flip-flop.

10. clockdiagram
One important fact about digital computers is that they
are clocked . This means that there is some “master
clock” sending out signals which are carefully
regulated in time.

11. COUNTERS
A counter is a sequential circuit making a use of a
number of flip-flop which undergo a sequence of states
on the application of triggering pulse at its input.
!..ASYNCHORONOUS OR RIPPLE COUNTER
!...RING COUNTER
!...THE JOHNSON OR TWISTED RING COUNTER

12. STATE DIAGRAMS
A state diagram is formed from a directed graph , state
diagrams have nodes , which are the curved lines with
arrowheads at one end.

13. shift registers
This circuits accepts information from some input
source and then shifts this information along the chain
of flip-flop , moving it through one flip-flop each time
when a positive-going clock signal occurs.

14. sis0
Serial in Serial Out (SISO) Shift Register. ... Figure 1 shows a n-
bit synchronous SISO shift register sensitive to positive edge of
the clock pulse. Here the data word which is to be stored is fed
bit-by-bit at the input of the first flip-flop.

15. SIPO
The Shift Register. ... Serial-in to Parallel-out (SIPO) - the
register is loaded with serial data, one bit at a time, with
the stored data being available at the output in parallel
form.

16. pipo
Parallel In Parallel Out (PIPO) shift registers are the type
of storage devices in which both data loading as well as
data retrieval processes occur in parallel mode.

17. piso
In Parallel In Serial Out (PISO) shift registers, the data is loaded onto the
register in parallel format while it is retrieved from it serially. ... Thus the
bits of the input data word (Data in) appearing as inputs to the gates A2 are
passed on as the outputs of OR gates at each individual combinational
circuit.

18. THANK YOU…