![]() The combinational logic circuits can be classified into various types based on the purpose of usage, such as arithmetic & logical functions, data transmission, and code converters. ![]() Classification of Combinational Logic Classificaiton of Combinational Logic The combinational logic is the process of combining logic gates to process the given two or more inputs such that to generate at least one output signal based on the logic function of each logic gate. The combinational logic circuits can be also be called as decision making circuits, as these are designed using individual logic gates. The logic diagram for above discussed logic function truth table and Boolean expression can be realized as shown in the above figure. The graphical representation of combinational logic functions using logic gates is called as logic diagram. Logic Diagram Combinational Logic Circuit using Logic Gates ![]() The output of combinational logic function can be expressed in the form expression using Boolean algebra and an example, Boolean expression for the above truth table is shown in the above figure. Boolean Algebra Combinational Logic Function Boolean Expression An example combinational logic function truth table is shown in the above figure. The logic gate function can be defined using its truth table which consists outputs for of all possible combinations of inputs of the logic gate. Truth Table Combinational Logic Function Truth Table The function of combinational logic circuits can be specified in three main ways such as: These logic circuits can be a very simple circuit or a very complex circuit or huge combinational circuit can be designed using only universal logic gates such as NAND and NOR gates. Hence, these logic gates are termed as building blocks. Combinational logic circuits are generally designed by connecting together or combining the basic logic gates such as NAND, NOR, and NOT. The combinational logic design can be done using two methods such as a sum of products and a product of sums. These combinational logic circuits are designed to produce specific outputs from certain inputs. Combinational Logic Circuit Design Combinational Logic Circuit Hence, if the input of combinational logic circuit changes, then the output also changes. ![]() Thus, we can say that combinational logic does not have memory, whereas sequential logic stores previous input in its memory. This combinational logic is in contrast compared to the sequential logic circuit in which the output depends on both present inputs and also on the previous inputs. The combinational logic circuit operation is instantaneous and these circuits do not have the memory or feedback loops. The combinational logic circuits or time-independent logic circuits in digital circuit theory can be defined as a type of digital logic circuit implemented using Boolean circuits, where the output of logic circuit is a pure function of the present inputs only. ![]()
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