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A synchronous circuit is a digital circuit
Digital circuit

Digital electronics are electronics systems that use digital signals. Digital electronics are representations of Boolean algebra and are used in computers, mobile phones, and other consumer products....
 in which the parts are synchronized by a clock signal
Clock signal

In electronics and especially Synchronous logic digital circuits, a clock signal is a Signalling used to coordinate the actions of two or more Electronic circuit....
.

In an ideal synchronous circuit, every change in the logical levels of its storage components is simultaneous. These transitions follow the level change of a special signal called the clock. Ideally, the input to each storage element has reached its final value before the next clock occurs, so the behaviour of the whole circuit can be predicted exactly.






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A synchronous circuit is a digital circuit
Digital circuit

Digital electronics are electronics systems that use digital signals. Digital electronics are representations of Boolean algebra and are used in computers, mobile phones, and other consumer products....
 in which the parts are synchronized by a clock signal
Clock signal

In electronics and especially Synchronous logic digital circuits, a clock signal is a Signalling used to coordinate the actions of two or more Electronic circuit....
.

In an ideal synchronous circuit, every change in the logical levels of its storage components is simultaneous. These transitions follow the level change of a special signal called the clock. Ideally, the input to each storage element has reached its final value before the next clock occurs, so the behaviour of the whole circuit can be predicted exactly. Practically, some delay is required for each logical operation, resulting in a maximum speed at which each synchronous system can run.

To make these circuits work correctly, a great deal of care is needed in the design of the Clock Distribution Networks
Clock Distribution Networks

In a synchronous circuit,the clock signal is used to define a timereference for the movement of data within that system. The clock distribution network distributes the clock signal from a common point to all the elements that need it....
. Static timing analysis
Static timing analysis

Static Timing Analysis is a method of computing the expected timing of a digital circuit without requiring simulation.High-performance integrated circuits have traditionally been characterized by the clock frequency at which they operate....
 is often used to determine the maximum safe operating speed.

See also

  • asynchronous circuit
    Asynchronous circuit

    An asynchronous circuit is a electrical network in which the parts are largely autonomous. They are not governed by a clock circuit or global clock signal, but instead need only wait for the signals that indicate completion of instructions and operations....
  • Moore machine
    Moore machine

    In the theory of computation, a Moore machine is a finite state transducer where the outputs are determined by the current state alone . The state diagram for a Moore machine will include an output signal for each state....
  • Mealy machine
    Mealy machine

    In the theory of computation, a Mealy machine is a finite state transducer that generates an output based on its current state and an input....
  • finite state machine
    Finite state machine

    A finite state machine or finite state automaton or simply a state machine, is a model of behavior composed of a finite number of state s, transitions between those states, and actions....