![]() ![]() However its truth table in positive logic has all the '1's and '0's inverted.ĭe Morgan's law says that an AND gate with inverted output (ie a NAND gate) is equivalent to an OR gate with inverted inputs, and an AND gate with inverted inputs is equivalent to an OR gate with inverted output (ie. That combination is then a negative logic AND gate, and its truth table (in negative logic) is the same as the bare AND gate was in positive logic. So to convert a gate from positive to negative logic you just have to invert (negate) all the signals.įor example if you had a positive logic AND gate that you wanted to use in a negative logic circuit, you would have to put inverters on both the inputs and the output. However if you are changing from positive to negative logic then logic '1' in positive logic translates to logic '0' in negative logic. logic '1' = low voltage and logic '0' = high voltage.Ī truth table only tells you the logic values, not the voltages that produce them. Positive logic assigns logic '1' to high voltage and logic '0' to low voltage. ![]()
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