The function of a combinational logic circuit can be specified or expressed by the following methods: Truth Table The task of a combinational logic circuit is to perform a defined logical function and there are multiple ways to specify a logical function. The combinational logic circuit can be simple or complex depending on the number of logic gates or logical operations it performs. The NAND, and NOR logic gates, as discussed in the Logic Gates section, are termed “ Universal Gates” as any other logical circuit can be constructed using only any of them. The combination of two or more logic gates forms the combinational logic circuit. These logic gates are the basic building blocks of any digital logic circuit. Whereas, the logic gates form the combinational logic and may consist of NAND, NOR, and NOT logic gates. The input and output variables represent digital states i.e. The combinational logic circuit consists of basic components such as logic gates, input, and output variables. Figure 1: The block diagram of a combinational logic circuitĬomponents of Combinational Logic Circuit This means that the output can change state from “0” to “1” or from “1” to “0” at the very moment the state of any input changes, accordingly. At any instant of time, the states of inputs are immediately reflected at the output depending on the logical combination of input states. which could affect its logical output besides inputs. The combinational logic circuit has no memory, storage, feedback, etc. The storage of the previous state of output acts as a memory in the sequential logic circuit and feedback also plays a similar role. Contrary to this, the output(s) of a sequential logic circuit is dependent on inputs and the previous state(s) of output. The output state(s) of the combinational logic circuit is the logical result of the combination of its inputs and does not involve any kind of memory or storage etc. The digital logic circuit whose output, at any instant, is dependent on its inputs only is referred to as a combinational logic circuit.
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