The Output of the Sequential Circuit Depends upon?

A unique class of circuits is referred to as a sequential circuit. It has several different inputs and outputs. Here, a combination of the current and prior outputs determines the outputs. This earlier output is handled in the context of the current situation. Thus, the combinational circuit and its memory storage components make up the sequential circuit. It is not required always to be a combinational circuit. Practically speaking, a sequential circuit can only have a memory component.

The output of a sequential circuit is dependent on both the current and previous inputs, whereas the output of a combinational circuit is solely dependent on the current inputs.

Types of Sequential Circuits

There are mainly two types of sequential circuits. These are asynchronous and synchronous sequential circuits. Both types are explained below.

• Asynchronous Sequential Circuits: The clock signals are not used by the asynchronous sequential circuits. Different pulses are used to operate this kind of circuit. As a result, our input modifications can easily alter our circuit's state. For asynchronous circuits, clock pulses are not used. Every time the input variable changes, in this case, the internal state also changes. In asynchronous sequential circuits, the memory components are time-delayed or unlocked flip-flops. This kind of circuit shares many similarities with combinational circuits and feedback circuits.

• Synchronous Sequential Circuits: In synchronous sequential circuits, the clock signal synchronizes the state of the memory components. In this instance, either latch (memory devices) or flip-flops are used to store the output. Only positive or only negative edges of the clock are used to synchronize the output.