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What are Flip Flops in Sequential Circuits?

by Team Goseeko

The flip flops in sequential circuits are the memory elements. Mainly used in clocked sequential circuits. They store one bit information. It is a circuit with two outputs, one is the normal value and other its complement value. We can know them by few more names as latches and Bistable multivibrators.

Sequential circuits are the combinational circuits with a memory element as the feedback path. The circuits have a time sequence of inputs, outputs and internal states. Depending upon the timing of the signal sequential circuits can be asynchronous and synchronous circuits.

Types of Latch

  • NAND Gate Latch: It uses two NAND gates which are cross coupled. Hence in turn it makes the output of one gate to input of another with a feedback path.
  • This latch can be known by one more name as asynchronous sequential circuit.
  • NOR Gate Latch: It is similar to NAND gate latch except that the two outputs have reversed position.

Types of Flip-Flops/Latch

  • RS Flip Flop: They are set-reset flip-flops. When both of its inputs are high we cannot determine the output.
  • JK Flip Flop: The JK flip flops overcome problem of toggle state in RS flip-flop. When both inputs are high the output is a complement of the present state.
  • D Flip Flop: It is a delay flip-flop. The output is the same as the input.
  • T Flip Flop: It is toggle flip-flop.


The basic applications of flip-flops are 

  • Counters
  • Frequency Dividers
  • Shift Registers
  • Storage Registers
  • Bounce elimination switch
  • Data storage
  • Data transfer
  • Latch
  • Registers
  • Memory

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