Digital logic design DLD Logic gates
- 1. Digital Logic & Design Lecture 05
- 2. Recap • Octal Number System • Alternate Representations – Excess Code – BCD Code – Gray Code • Alphanumeric Code (ASCII) • Error Detection using Parity Bit
- 3. Logic Gates • Basic Building Blocks • Logic Gate Symbol • Unique function • Truth or Function Table • Function Expression • Timing Diagram
- 4. AND Gate • 1 output • 2 inputs • 3 inputs • 4 inputs • Multiple inputs
- 5. AND Gate function • Logical Multiplication function Input Output A B F 0 0 0 0 1 0 1 0 0 1 1 1 BAF •= NCBAF ••••= ....
- 6. AND Gate Timing Diagram
- 7. AND Gate function BAF •=
- 8. AND Gate Timing Diagram BAF •=
- 9. OR Gate • 1 output • 2 inputs • 3 inputs • 4 inputs • Multiple inputs
- 10. OR Gate function • Boolean Add function Input Output A B F 0 0 0 0 1 1 1 0 1 1 1 1 BAF += NCBAF ++++= ..
- 11. OR Gate Timing Diagram
- 12. NOT Gate • 1 input • 1 output
- 13. NOT Gate function • Invert function Input Output A F 0 1 1 0 AF =
- 14. NOT Gate Timing Diagram
- 15. AND Gate Applications • Enable/Disable Device – Counter counts when it receives pulses
- 16. OR Gate Applications • Car door open alarm
- 17. NOT Gate Applications • 1’s Complement
- 19. NAND Gate • 1 output • 2 inputs • 3 inputs • 4 inputs • Multiple inputs
- 20. NAND Gate function • NOT-AND function Input Output A B F 0 0 1 0 1 1 1 0 1 1 1 0 BAF •= NCBAF ••••= ....
- 21. NAND Gate Timing Diagram t0 t4 t5 t6 t1 t2 t3 A B F
- 22. NAND Universal Gate Input Output A B F 0 0 1 0 1 1 1 0 1 1 1 0
- 23. NAND Universal Gate Input Output Output A B F1 F 0 0 1 0 0 1 1 0 1 0 1 0 1 1 0 1
- 24. NAND Universal Gate Input Output A B F 0 0 0 0 1 1 1 0 1 1 1 1
- 25. NOR Gate • 1 output • 2 inputs • 3 inputs • 4 inputs • Multiple inputs
- 26. NOR Gate function • NOT-OR function Input Output A B F 0 0 1 0 1 0 1 0 0 1 1 0 BAF += NCBAF ++++= ....
- 27. NOR Gate Timing Diagram
Editor's Notes
- #2: Asalam O Aleikum students. I am Waseem Ikram. This is the fifth lecture in a series of 45 lectures on Digital Logic Design.