The output expression are obtained as shown below,įrom these simplified expressions, the 8 to 3 priority encoder circuit diagram is drawn as illustrated with logic gates as shown in the figure below.Ĩ to 3 types are available in the standard IC 74LS148, which consists of 8 active low or logic 0 inputs and 3 active high or logic 1 output bits. Hence, the generated output is based on the priority assigned to the inputs. The input that has the larger magnitude or highest priority is encoded first rather than other input lines. This is a type of binary encoder or an ordinary encoder with a priority function.
To obtain the output, only the input with the highest priority is considered by ignoring all other input lines. The output of this encoder corresponds to the input that has the highest priority. If more than one input line is active high(1) at the same time, then this encoder prioritizes every input level and allocates the priority level to each input. It is used to solve the issues in binary encoders, which generate wrong output when more than one input line is active high.
When multiple input lines are active high at the same time, then the input that has the highest priority is considered first to generate the output. The priority encoder is a combinational logic circuit that contains 2^n input lines and n output lines and represents the highest priority input among all the input lines.
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