Full Adder function using 3:8 Decoder

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Preview of Full Adder function using 3:8 Decoder with 74LS20 and 74LS138 ICs
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Tutorial

Start by tapping on Next button.

1. Click on 'Next' button to Add 74LS20 and 74LS138 IC

Click on 'Next' button to Add 74LS20 and 74LS138 IC

2. Click on 'Next' button to Connect GND and VCC of ICs

Click on 'Next' button to Connect GND and VCC of ICs

3. Click on 'Next' button to Connect select line 'C' to Pin-1 of IC

Click on 'Next' button to Connect select line 'C' to Pin-1 of IC

4. Click on 'Next' button to Connect select line 'B' to Pin-2 of IC

Click on 'Next' button to Connect select line 'B' to Pin-2 of IC

5. Click on 'Next' button to Connect select line 'A' to Pin-3 of IC

Click on 'Next' button to Connect select line 'A' to Pin-3 of IC

6. Click on 'Next' button to Connect 'G1' to Vcc

Click on 'Next' button to Connect 'G1' to Vcc

7. Click on 'Next' button to Connect 'G2A' to GND

Click on 'Next' button to Connect 'G2A' to GND

8. Click on 'Next' button to Connect 'G2B' to GND

Click on 'Next' button to Connect 'G2B' to GND

9. Click on 'Next' button to Connect Output 'Y1' to Pin-1 of NAND Gate-1

Click on 'Next' button to Connect Output 'Y1' to Pin-1 of NAND Gate-1

10. Click on 'Next' button to Connect Output 'Y2' to Pin-2 of NAND Gate-1

Click on 'Next' button to Connect Output 'Y2' to Pin-2 of NAND Gate-1

11. Click on 'Next' button to Connect Output 'Y3' to Pin-9 of NAND Gate-2

Click on 'Next' button to Connect Output 'Y3' to Pin-9 of NAND Gate-2

12. Click on 'Next' button to Connect Output 'Y4' to Pin-4 of NAND Gate-1

Click on 'Next' button to Connect Output 'Y4' to Pin-4 of NAND Gate-1

13. Click on 'Next' button to Connect Output 'Y5' to Pin-16 of NAND Gate-2

Click on 'Next' button to Connect Output 'Y5' to Pin-16 of NAND Gate-2

14. Click on 'Next' button to Connect Output 'Y6' to Pin-12 of NAND Gate-2

Click on 'Next' button to Connect Output 'Y6' to Pin-12 of NAND Gate-2

15. Click on 'Next' button to Connect Output 'Y7' to Pin-13 of NAND Gate-2

Click on 'Next' button to Connect Output 'Y7' to Pin-13 of NAND Gate-2

16. Click on 'Next' button to Connect Output 'Y7' to Pin-5 of NAND Gate-1

Click on 'Next' button to Connect Output 'Y7' to Pin-5 of NAND Gate-1

17. Click on 'Next' button to Connect Output of NAND Gate-1 to Output Port as 'SUM'

Click on 'Next' button to Connect Output of NAND Gate-1 to Output Port as 'SUM'

18. Click on 'Next' button to Connect Output of NAND Gate-2 to Output Port as 'CARRY'

Click on 'Next' button to Connect Output of NAND Gate-2 to Output Port as 'CARRY'

Done

You have completed the tutorial. Power on the circuit to test the behavior.

Step-by-Step Procedure

  1. Click on 'Next' button to Add 74LS20 and 74LS138 IC
  2. Click on 'Next' button to Connect GND and VCC of ICs
  3. Click on 'Next' button to Connect select line 'C' to Pin-1 of IC
  4. Click on 'Next' button to Connect select line 'B' to Pin-2 of IC
  5. Click on 'Next' button to Connect select line 'A' to Pin-3 of IC
  6. Click on 'Next' button to Connect 'G1' to Vcc
  7. Click on 'Next' button to Connect 'G2A' to GND
  8. Click on 'Next' button to Connect 'G2B' to GND
  9. Click on 'Next' button to Connect Output 'Y1' to Pin-1 of NAND Gate-1
  10. Click on 'Next' button to Connect Output 'Y2' to Pin-2 of NAND Gate-1
  11. Click on 'Next' button to Connect Output 'Y3' to Pin-9 of NAND Gate-2
  12. Click on 'Next' button to Connect Output 'Y4' to Pin-4 of NAND Gate-1
  13. Click on 'Next' button to Connect Output 'Y5' to Pin-16 of NAND Gate-2
  14. Click on 'Next' button to Connect Output 'Y6' to Pin-12 of NAND Gate-2
  15. Click on 'Next' button to Connect Output 'Y7' to Pin-13 of NAND Gate-2
  16. Click on 'Next' button to Connect Output 'Y7' to Pin-5 of NAND Gate-1
  17. Click on 'Next' button to Connect Output of NAND Gate-1 to Output Port as 'SUM'
  18. Click on 'Next' button to Connect Output of NAND Gate-2 to Output Port as 'CARRY'

Block Diagram

Block diagram representing pin diagram of Full Adder function using 3:8 Decoder with 74LS20 and 74LS138 ICs

ICs used in this circuit with pin diagram



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