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BCA Major portion in Barathidhasan university

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digital

  1. 1. ELECTRONICS DIGITAL
  2. 2. NAND and NOR implementaion <ul><li>NAND and NOR gate are used in the design of digital circuit . </li></ul><ul><li>AND,OR,NOT, into equalent NAND and NOR logic diagrams. </li></ul><ul><li>The AND invert consist of AND graphic symbol followed by a small circle .it </li></ul><ul><li>Is also possible to represent a NAND gate by an OR graphic symbol preceded </li></ul><ul><li>By a small circle in all the inputs . The symbol is know as invert OR </li></ul>F=XYZ X Y Z AND- invert
  3. 3. X Y Z F=XYZ Invert OR
  4. 4. X Y Z F=X+Y+ Z X Y Z F=X Y Z = ( X+Y+Z ) _ _ _ Invert And OR Invert
  5. 5. X X _ X X _ X X _ Three graphic symbol of inverter
  6. 6. NAND implementation F=AB+CD+E The Sum of products form with AND and OR gate A B C D E AB CD E F=AB+CD+E
  7. 7. NAND NAND implementation A B C D E E F=AB+CD+E _
  8. 8. The NAND function is so implemented ,that it can be easily converted to a Sum Of products form by using DeMorgans theorem A B C D E E _ AB CD F=AB.CD.E __ __ _ _______ F=AB+CD+E
  9. 9. NOR implementation F=(A+B) (C+D) F (A+B) (C+D) E ABCDE
  10. 10. A B C D E (A+B) (C+D) E F F=(A+B) (C+D) NOR -AND implementation
  11. 11. NOR-NOR implementation A B C D E (A+B) (C+D) E F=(A+B) (C+D) E
  12. 12. AND-OR-invert implementation A B C D E F=AB+CD+E ________ AB CD E The two forms NAND-AND and AND-OR are equalent forms And can be treated .Both perform the AND-OR-INVERT AND-NOR
  13. 13. A B C D E AB CD E F=AB.CD.E __ __ _ F=AB+CD+E ________ AND-NOR circuit
  14. 14. AB CD A B C D E __ __ E _ F F=AB+CD+E ________ NAND-AND
  15. 15. OR-AND-Invert implementation <ul><li>The OR-NAND and NOR forms perform the OR-AND-INVERT </li></ul><ul><li>funcation </li></ul>F (A+B) (C+D) E ABCDE F=(A+B).(C+D).E
  16. 16. A B C D E F F=(A+B)+(C+D)+E =(A+B).(C+D).E _____ ____ OR-NAND
  17. 17. Vasanth B C A achelor riminal ctivites OF

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