{"id":1485,"date":"2021-04-21T16:00:16","date_gmt":"2021-04-21T10:15:16","guid":{"rendered":"https:\/\/bcisnotes.com\/secondsemester\/?p=1485"},"modified":"2021-04-21T16:00:16","modified_gmt":"2021-04-21T10:15:16","slug":"sequential-and-combinational-circuit","status":"publish","type":"post","link":"https:\/\/bcisnotes.com\/secondsemester\/digital-systems\/sequential-and-combinational-circuit\/","title":{"rendered":"Sequential and Combinational Circuit || Combinational Circuit || Bcis Notes"},"content":{"rendered":"

Sequential circuit<\/strong><\/p>\n

A sequential circuit is the assimilation of a combinational logic circuit and a storage element. With the applied inputs to the combinational logic, the circuit outputs are derived. Although every digital system is likely to have a combinational circuits, most systems encountered in practice\u00a0 also include memory elements, which requires that the system be describes in term of sequential circuit.<\/p>\n

The Block diagram for sequential circuit is given below:<\/p>\n

\"See<\/p>\n

Combinational Circuit<\/strong><\/p>\n

In digital circuit theory, a combinational logic is a type of digital logic which is implemented by Boolean circuit, where the output is a pure function of the present input only. This is in contrast to sequential logic in which the output depends upon not only on the present input but also on the history of input.<\/p>\n

The block diagram of combinational circuit is given below:<\/p>\n

\"sequential<\/p>\n

Difference between these two circuits is given below:<\/p>\n\n\n\n\n\n\n\n\n\n\n
S. N.<\/th>\nKeys<\/th>\nCombinational Circuit<\/th>\nSequential Circuit<\/th>\n<\/tr>\n<\/thead>\n
1<\/td>\nDefinition<\/td>\nCombinational Circuit is the type of circuit in which output is independent of time and only relies on the input present at that particular instant.<\/td>\nOn other hand Sequential circuit is the type of circuit where output not only relies on the current input but also depends on the previous output.<\/td>\n<\/tr>\n
2<\/td>\nFeedback<\/td>\nIn Combinational circuit as output does not depend on the time instant, no feedback is required for its next output generation.<\/td>\nOn other hand in case of Sequential circuit output relies on its previous feedback so output of previous input is being transferred as feedback used with input for next output generation.<\/td>\n<\/tr>\n
3<\/td>\nPerformance<\/td>\nAs the input of current instant is only required in case of Combinational circuit, it is faster and better in performance as compared to that of Sequential circuit.<\/td>\nOn other hand Sequential circuit are comparatively slower and has low performance as compared to that of Combinational circuit.<\/td>\n<\/tr>\n
4<\/td>\nComplexity<\/td>\nNo implementation of feedback makes the combinational circuit less complex as compared to sequential circuit.<\/td>\nHowever on other hand implementation of feedback makes sequential circuit more complex as compared to combinational circuit.<\/td>\n<\/tr>\n
5<\/td>\nElementary Blocks<\/td>\nElementary building blocks for combinational circuit are logic gates.<\/td>\nOn other hand building blocks for sequential circuit are flip flops..<\/td>\n<\/tr>\n
6<\/td>\nOperation<\/td>\nCombinational circuit are mainly used for arithmetic as well as Boolean operations.<\/td>\nOn other hand Sequential circuit is mainly used for storing data.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

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Therefore these are some difference between sequential and combinational circuit.<\/p>\n

You may also like:\u00a0Data Flipflop (D-flipflop)\u00a0<\/a><\/p>\n

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