In the Sequential circuit the clock is utilized to perform the Triggering functions. These circuits have an ability to store the present state and retain the previous state. This is due to because the memory elements are present in the sequential circuits. The speed of the sequential circuit is very low. The cost of the sequential circuit is very low. The operation of the sequential circuits can be explained by the truth table and also by the timing diagram. The Sequential circuit stores very small amount of data. The hardware required for the realization of the combinational circuit is small. The sequential circuits are time dependent. There is feedback is required in the sequential circuits, that’s is the reason they are more complex than the combinational circuits. 
The behavior is expressed by the set of next-state and the set of output functions. In the sequential circuits the combination of the operands essential in the same sequence. The present value of the output is determined by the present values of the input and it also depends on the present state of the circuit. The main building block of these Circuits are the flip-flop. Memory element is present in these circuit. The diagram of the sequential logic circuits is discussed as under. which can have the output or outputs set in one of two basic states, a logic level “1” or a logic level “0” and will remain “latched” (hence the name latch) indefinitely in this current state or condition until some other input trigger pulse or signal is applied which will cause the bistable to change its state once again. Sequential logic circuits are usually named as the Bi Stable device or the two-state device. The previous output is saved in the memory element. This means that when we applied inputs than the output is generated, the output not only depends on the input but also for the previous output. In this type of circuit, we attach the memory element with the combinational circuit. Sequential circuit is the extension of the combinational circuit. In the sequential circuit the present output depends upon the present inputs and also depends on the past output. These circuits are mainly used for the Arithmetic(Addition, Subtraction, Multiplication and Division) and the Boolean Functions. #Combinational vs sequential circuits full
The example of these circuits is Half Adder, Full Adder, magnitude compactor and de-multiplexer. This is because they are used in the various applications. There are many types of the combinational circuits are existing in which the multiplexer and the de- multiplexer are significant. The feedback is not required in this type of circuit. The combinational circuits are more costly than the sequential circuits. 
The designing of these type of circuit is easier.
The combinational circuits are not time dependent.Any change in the input will be reflected at the output terminal of the combinational circuits.On the other hand, the combinational circuits have not the ability to store the present state and to retain the previous state.These circuits are very expensive because the large number of gates are required in the operation of the combinational circuits.The operation of the combinational circuits can be explained by the truth table.The data is not stored in the combinational circuits.The hardware required for the realization of the combinational circuit is large.There is no feedback is required in the combinational circuits, that’s is the reason they are less complex than the sequential circuits.The behavior of these circuits is explained by the output function test.In the combinational circuits the combination of the operands is not essential in the same sequence.The present value of the output is determined by the present values of the input.The main building block of these Circuits are the logic gates.In this circuit there is no memory element is present.The difference between the sequential and the combinational circuits are discussed as under. These types of circuits have no feedback which means that any change is applied to the input directly affects the output of the logic circuit. The diagram of the combinational logic circuits is discussed as under. The combinational circuits are the memoryless circuits which means that one of the input states changes the condition from 0-1 and 1-0, so it will change the resulting output of the combinational circuit. In the combinational logic circuits these gates are combined to form a complicated Switching Systems. These Type of circuits are made up of the NAND, NOR and NOT Gates. In this type of circuit, the output depends on the input. In the combinational circuit the output at any time only depends on the combinations of the inputs. These types of the circuit are the memory-less circuit.
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