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Sequential circuits are digital circuits that store and use the previous state information to determine their next state. Unlike combinational circuits, which only depend on the current input values to produce outputs, sequential circuits depend on both the current inputs and the previous state stored in memory elements.
Sequential circuits are commonly used in digital systems to implement state machines, timers, counters, and memory elements. The memory elements in sequential circuits can be implemented using flip-flops, which are circuits that store binary values and maintain their state even when the inputs change.
There are two types of sequential circuits: finite state machines (FSMs) and synchronous sequential circuits. FSMs are designed to have a limited number of states and are typically used to implement state machines and control systems. Synchronous sequential circuits, on the other hand, are designed to have an infinite number of states and are typically used to implement timers, counters, and memory elements.
In summary, sequential circuits are digital circuits that store and use previous state information to determine their next state. They are commonly used in digital systems to implement state machines, timers, counters, and memory elements and are essential components in digital systems design.
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