adder and subtractor

sanath
sanath s
• Created on Dec 7, 2024 • 0 • 0 • 2
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adder and subtractor
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Integrated Circuits Used

74LS08 74LS86

Description

it is a circuit which adds a 2 bit number when the select input(the first input) is 0 and add the number when the select input is 1 . the outputs are o1 and o2 are sum and carry respectively for s=0 ; o1 and o2 are difference and borrow for s=1 .

Procedure

  1. Add IC 74LS08 into ICBase-2 (74LS08).
  2. Add IC 74LS86 into ICBase-3 (74LS86).
  3. Connect GND Port to Pin-7 (Ground) of ICBase-2 (74LS08).
  4. Connect Pin-7 (Ground) of ICBase-3 (74LS86) to GND Port.
  5. Connect VCC Port to Pin-20 (VCC) of ICBase-3 (74LS86).
  6. Connect Pin-20 (VCC) of ICBase-2 (74LS08) to VCC Port.
  7. Connect Input-15 to Pin-1 (Input) of ICBase-3 (74LS86).
  8. Connect Pin-2 (Input) of ICBase-3 (74LS86) to Input-14.
  9. Connect Pin-3 (Output) of ICBase-3 (74LS86) to Pin-1 (Input) of ICBase-2 (74LS08).
  10. Connect Pin-2 (Input) of ICBase-2 (74LS08) to Input-13.
  11. Connect Pin-3 (Output) of ICBase-2 (74LS08) to Output-14.
  12. Connect Pin-4 (Input) of ICBase-3 (74LS86) to Input-14.
  13. Connect Pin-5 (Input) of ICBase-3 (74LS86) to Input-13.
  14. Connect Pin-6 (Output) of ICBase-3 (74LS86) to Output-15.
  15. Connect GND Port to ICBase-3 (74LS86).
  16. Connect VCC Port to ICBase-2 (74LS08).
  17. Connect Pin-1 (Input) of ICBase-2 (74LS08) to ICBase-3 (74LS86).
  18. Connect Output-14 to ICBase-2 (74LS08).
  19. Connect Input-14 to ICBase-3 (74LS86).
  20. Connect Input-13 to ICBase-3 (74LS86).
  21. Connect Output-15 to ICBase-3 (74LS86).