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  1. 1. •POSITIVE LOGIC •In this the state (also called true or on )is considered to be the more positivevoltage level.The normal values of HIGH and LOW positive logic low value =0high value =1• NEGATIVE LOGIC The state1(True or on)corresponds to the less positive voltage Nagative logiclow value =1high value=0 NAND gate in positive logic(H=1,L=0) A B Y 0 0 1 0 1 1 1 1 1 1 1 0NOR gate in negative logic (H=1,L=0) A B Y 1 1 0 1 0 0 0 1 0 0 0 1 LOGIC CHARACTERISTICSThe differernt characteristics of a logic family. 1.speed 4.noise immunity 5.power dissipationThe speedIt takes into account the trasition times.FAN-INThe logic gateb is a number of inputs.FAN-OUTThe fan-out of a logic gate is the maximum number of similar circuits.NOISE IMMUNITYIt is also called a noise margin.POWERThe power dissipation of a gate should also be small possbile.