Flip flop is an important basic memory element for digital circuit. Flip-flop is designed
by assembling different logic gates. Single logic gate does not have any information
storing capacity but by combining different such gates one can make such a digital
circuit which can store digital information.
Flip flop is such circuit.
There are different
types of flip flop with different characteristics for different application. Flip-flop is the
basic building blocks of most sequential circuits. Flip-flop (FF), is also known as
a bistable multivibrator, because it has two stable states.
It can remain in either of the
states indefinitely. Its state can be changed by applying the proper triggering signal. Flip
flop is one-bit memory element.
Clocked RS Flip Flop:
The RS latch flip flop required the direct input but no clock. It is very useful to add clock
to control precisely the time at which the flip flop changes the state of its output.
In the clocked R-S flip flop the appropriate levels applied to their inputs are blocked till
the receipt of a pulse from another source called c lock. The flip flop changes state only
when clock pulse is applied depending upon the inputs. This circuit shown below is
formed by adding two AND gates at inputs to the R-S flip flop. In addition to control
inputs Set (S) and Reset (R), there is a clock input (C) also.
Circuit Diagram of Clocked RS Flip Flop:
Truth Table of Clocked RS Flip Flop:
Excitation Table of Clocked RS Flip Flop:
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