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Chapter 3 Continued Logic Gates Logic Chips Combinational Logic Timing Sequential Logic Flip Flops Registers Memory State Machines

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CMOS Device - Inverter p channel device n channel device CMOS Inverter 3-5 volts

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Basic Logic Gates

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2 BIT Decoder

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Truth Tables A B C | E 0 0 0 | 0 0 0 1 | 0 0 1 0 | 0 0 1 1 | 0 1 0 0 | 0 1 0 1 | 0 1 1 0 | 1 1 1 1 | 1 What logic function does this represent?

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DeMorgan’s Theorem Not A and Not B = Not (A or B) Not A or Not B = Not (A and B) Can we prove this with Truth Tables?

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Complete 74x139 Decoder

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74x138 3-to-8-decoder symbol

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2-to-1 MUX MUX Circuit Case: S=0 MUX Symbol

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4-to-1 MUX Logic Symbol

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F D 0 D 1 D 2 D 3 D 4 D 5 D 6 D 7 ABC AABCBC 8 to 1 MUX

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Standard Symbols for Multiplexers 8 to 1 Vector(2) of 4 to 1 Vector(4) of 2 to 1

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1 Bit Full Adder

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