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Digital Logic & Design Dr. Waseem Ikram Lecture 06

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Recap Logic Gates Basic Building Blocks Symbol Performs unique function Represented by a function/truth table Function expression Timing Diagram

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Recap AND Gate F=A.B OR GateF=A+B NOT Gate AND Gate enables/disables device OR Gate car door alarm system NOT Gate 1s complement

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Recap Alternate Symbolic representations NAND Gate NOT-AND operation Universal NAND Gate NOR Gate NOT-OR operation Universal NOR Gate

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NOR Universal Gate InputOutput ABF

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NOR Universal Gate InputOutput ABF

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NAND-NOR Universal Gate

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NAND Gate Applications Device Failure Alarm

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NOR Gate Applications Washing Machine Controller

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XOR Gate 1 output 2 inputs Multiple inputs

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XOR Gate function InputOutput ABF

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XOR Gate Timing Diagram

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XNOR Gate 1 output 2 inputs Multiple inputs

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XNOR Gate function InputOutput ABF

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XNOR Gate Timing Diagram

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XOR Gate Applications Detecting odd number of 1s

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XNOR Gate Applications Detecting even number of 1s

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TTL/CMOS NOT Gate +V CC +V V o/p V i/p +V DD V i/p V o/p NPN Transistor N-Type MOSFET P-Type MOSFET

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Type of IC Logic Gates 74XX00Quad 2-input NAND Gate 74XX02Quad 2-input NOR Gate 74XX04Hex Inverter 74XX08Quad 2-input AND Gate 74XX10Triple 3-input NAND Gate 74XX11Triple 3-input AND Gate 74XX20Dual 4-input NAND Gate

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Type of IC Logic Gates 74XX21Dual 2-input AND Gate 74XX27Triple 3-input NOR Gate 74XX30Single 8-input NAND Gate 74XX32Quad 2-input OR Gate 74XX86Quad 2-input XOR Gate 74XX133Single 13-input NAND Gate

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Logic Gate Integrated Circuits

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Integrated Circuits (IC) CMOS Complementary Metal Oxide Logic TTL Transistor-Transistor Logic ECL Emitter Coupled Logic PMOS p-channel MOS transistor NMOS n-channel MOS transistor E 2 CMOS

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Operational Characteristics DC Supply Voltage Noise Margin Power Dissipation Frequency Response Fan Out

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