The Block diagram of the combinational logic circuit is shown below. Considering each output variable, the total number of Boolean functions can be "m." For every combination of inputs, there is only one combination of binary output. The source of input variables and output variables are generally known as storage registers.įor the ‘n’ number of binary input variables, there is a possibility of a 2 n number of combinations. At the input end, there can be n-input variables, and at the output end, there can be m-output variables. In general, binary signals have two type of values, i.e., logic-0 or logic-1. The information is in the form of binary signals at the ends of both input and output. In this way, the binary data from input is transformed into useful or required data as an output. The logic gates receive data from input variables and generate output variables. In this article, we will focus more on combinational circuits.Ī combinational circuit is a combination of three things. Along with logic gates, memory elements are also used to store previous input data.Įxamples of the sequential circuit are counters, shift-registers, etc. Sequential circuit: - At any instant of time, the output of the logic circuit depends on the inputs of the present combination as well as on previous (or past) inputs. The feedback path and memory elements are absent in this type of circuit.Įxamples of combinational circuits are adders, subtractors, comparators, decoders, encoders, and multiplexers. It follows a set of Boolean functions and is used to perform specific data processing. In digital system, Logic circuits generally fall into two categories.Ĭombinational circuit: - At any instant of time, the output of the logic circuit depends on the inputs of the present combination regardless of its previous inputs.
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