All questions have been asked in GATE in previous years or in GATE Mock Tests. Practicing the following questions will help you test your knowledge. We use synchronous sequential circuit in synchronous counters, flip flops, and in the design of MOORE-MEALY state management machines. We use sequential circuits to design Counters, Registers, RAM, MOORE/MEALY Machine and other state retaining machines. Level output changes state at the start of an input pulse and remains in that until the next input or clock pulse. Since they wait for the next clock pulse to arrive to perform the next operation, so these circuits are bit slower compared to asynchronous. The output pulse is the same duration as the clock pulse for the clocked sequential circuits. Type2: Synchronous sequential circuit: These circuits uses clock signal and level inputs (or pulsed) (with restrictions on pulse width and circuit propagation).
We use asynchronous sequential circuits when speed of operation is important and independent of internal clock pulse.īut these circuits are more difficult to design and their output is uncertain. These circuits are faster than synchronous sequential circuits because there is clock pulse and change their state immediately when there is a change in the input signal. Type 1: Asynchronous sequential circuit: These circuits do not use a clock signal but uses the pulses of the inputs. There are two types of sequential circuits: Secondary inputs are state variables produced by the storage elements, whereas secondary outputs are excitations for the storage elements.
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