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3.1 Logic Signals and Gates Logic Signals ReturnNext Logic Value: Many physical quantities can be represented two possible numbers or logic values — 0 and 1 (See P81 Table 3- 1). A logic value is often called a binary digit, or bit. LOW and HIGH: LOW: A signal in the range of algebraically lower voltages.
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3.1 Logic Signals and Gates Positive Logic and Negative Logic NextBack High: A signal in the range of algebraically higher voltages. t v VHVH VLVL Positive Logic 1 0 t v VHVH VLVL Negative Logic 1 0 Return
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3.1 Logic Signals and Gates Gates and Truth Tables AND gate X Y F XYF 00110011 01010101 00010001 Truth table for an AND gate with two inputs An AND gate produces a 1 output if and only if all of its inputs are 1; and produces a 0 output if any input is 0. F=XY NextBackReturn
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3.1 Logic Signals and Gates OR gate XYF 00110011 01010101 01110111 Truth table for an OR gate with two inputs An OR gate produces a 1 output if any input is 1; and produces a 0 output if and only if all of its inputs are 0. F=X+Y X Y F NextBackReturn
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3.1 Logic Signals and Gates NOT gate XF 0101 1010 Truth table for a NOT gate A NOT gate, usually called an inverter, produces an output value that is the opposite of its input value. X F NextBackReturn
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3.1 Logic Signals and Gates NAND gate Truth table for a NAND gate NextBackReturn X Y F XYF 00110011 01010101 11101110 A NAND gate produces a 0 output if and only if all of its inputs are 1; and produces a 1 output if any input is 0.
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3.1 Logic Signals and Gates NOR gate Truth table for a NOR gate BackReturn XYF 00110011 01010101 10001000 A NOR gate produces a 1 output if and only if all of its inputs are 0; and produces a 0 output if any input is 1. X Y F
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