The present era, the era of digital devices mainly concerned about storage technology. Storage of data and processing of data are the two main functions that to be attended in digital technology. Binary counting devices require digital devices with two stable states. These devices are capable of undergoing a change from one state to another by the application of a trigger pulse to one of its inputs. A flip-flop is an ideal circuit with two stable states. It is capable of storing a signal like a ‘memory’ until new signal is applied to the circuit. Different types of flip-flops exist in the market. They are Set-Reset (SR) flip-flop, JK master slave flip-flop and D-flip-flop. SR flip-flops have two inputs and two outputs. Either NOR gates or NAND gates are used for the construction of SR flip-flop. An emitter-coupled bistable multivibrator can be used as an SR flip-flop. Master slave principle is used in JK master slave flip-flops. The main application of JK master slave flip-flops are in complex counters. Only one input is provided in D-flip-flops and they are widely used in shift registers and sequential logic circuits.
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