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Digital Logic & Design Dr. Waseem Ikram Lecture 06

Digital Logic & Design Dr. Waseem Ikram Lecture 06. Recap. Logic Gates Basic Building Blocks Symbol Performs unique function Represented by a function/truth table Function expression Timing Diagram. Recap. AND Gate F=A.B OR Gate F=A+B NOT Gate AND Gate enables/disables device

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Digital Logic & Design Dr. Waseem Ikram Lecture 06

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  1. Digital Logic & DesignDr. Waseem IkramLecture 06

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

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

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

  5. NOR Universal Gate

  6. NOR Universal Gate

  7. NAND-NOR Universal Gate

  8. NAND Gate Applications • Device Failure Alarm

  9. NOR Gate Applications • Washing Machine Controller

  10. XOR Gate • 1 output • 2 inputs • Multiple inputs

  11. XOR Gate function

  12. XOR Gate Timing Diagram

  13. XNOR Gate • 1 output • 2 inputs • Multiple inputs

  14. XNOR Gate function

  15. XNOR Gate Timing Diagram

  16. XOR Gate Applications • Detecting odd number of 1’s

  17. XNOR Gate Applications • Detecting even number of 1’s

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

  19. Type of IC Logic Gates • 74XX00 Quad 2-input NAND Gate • 74XX02 Quad 2-input NOR Gate • 74XX04 Hex Inverter • 74XX08 Quad 2-input AND Gate • 74XX10 Triple 3-input NAND Gate • 74XX11 Triple 3-input AND Gate • 74XX20 Dual 4-input NAND Gate

  20. Type of IC Logic Gates • 74XX21 Dual 2-input AND Gate • 74XX27 Triple 3-input NOR Gate • 74XX30 Single 8-input NAND Gate • 74XX32 Quad 2-input OR Gate • 74XX86 Quad 2-input XOR Gate • 74XX133 Single 13-input NAND Gate

  21. Logic Gate Integrated Circuits

  22. Logic Gate Integrated Circuits

  23. 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 • E2CMOS

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

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