A flip-flop is a digital circuit that has two stable states and is used to store state information. There are four main types of flip-flops: JK, D, T, and SR. The SR flip-flop has two inputs called set and reset that set the output to 1 or 0 respectively. SR flip-flops can also be clocked using NAND or NOR gates to synchronize the changing of states with a clock signal. One application of clocked SR flip-flops is in switch debouncing circuits to eliminate unwanted switching from mechanical switch bounce.

1.  WHAT IS A FLIP FLOP ?
• 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.

2. TYPES OF FLIP FLOPS
There are basically four different types of flip flops and these are:
• Set-Reset (SR) flip-flop or Latch.
• JK flip-flop.
• D (Data or Delay) flip-flop.
• T (Toggle) flip-flop.

3. JK FLIP FLOP

4. D (DATA OR DELAY) FLIP FLOP

5. T (TOGGLE) FLIP FLOP

6. SR FLIP FLOP
• The SR flip flop is a 1-bit memory bistable device having two
inputs, i.e., SET and RESET. The SET input 'S' set the device or
produce the output 1, and the RESET input 'R' reset the device or
produce the output 0. The SET and RESET inputs are labeled as S and
R, respectively.

7. TRUTH TABLE OF SR FLIP FLOP

8. SR FLIP FLOP

9. CLOCKED SR FLIP FLOP
• Two types of clocked SR flip – flops are possible: based
on NAND and based on NOR. The circuit of clocked SR
flip – flop using NAND gates is shown below

10.  CLOCKED SR FLIP FLOP USING NAND GATE

11.  CLOCKES SR FLIP FLOP USING NOR GATE

12.  APPLICATIONS OF CLOCKED RF FLIP FLOP
• SR flip – flops are very simple circuits but are not widely used in
practical circuits because of their illegal state, where both S and R are
high (S = R = 1). But they are used in switching circuits as they
provide simple switching function (between Set and Reset).
• One such application is a Switch de-bounce circuit. The SR flip-flops
are used to eliminate mechanical bounce of switches in digital circuits.