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Comparator Designing 1 Bit 2 Bit And 4 Bit Comparators Using
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A 3 b 3 being the most significant inputs.
Logic diagram for 4 bit comparator. It used 75 gates. In a 4 bit comparator the condition of a b can be possible in the following four cases. Addition subtraction shift operand one bit magnitude comparison plus 12 more it also implemented several logic operations. We will compare each bit of the two 4 bit numbers and based on that comparison and the weight of their positions we will draft a truth table.
The truth table for a 4 bit comparator would have 4 4 256 rows. Exclusive or comparator and nand or nor plus 10 more here is the logic diagram. 3 20 april 2018 product data sheet 1 general description the 74hc85. They perform comparison of two 4 bit binary bcd or other monotonic codes and present the three possible magnitude results at the outputs qa b qa b and qa b.
By the way they re still available from some distributors such as newark and mouser. A comparator used to compare two binary numbers each of four bits is called a 4 bit magnitude comparator. It consists of eight inputs each for two four bit numbers and three outputs to generate less than equal to and greater than between two binary numbers. 4 bit magnitude comparator the sn54 74ls85 is a 4 bit magnitude camparator which compares two 4 bit words a b each word having four parallel inputs a 0 a3 b 0 b3.
4 bit magnitude comparator rev. The logic circuit of a 2 bit comparator how to design a 4 bit comparator.
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