4 bit Synchronous DOWN counter using JK Flip flops 74LS76

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Preview of 4 bit Synchronous DOWN counter using JK Flip flops 74LS76 with 74LS08 and 74LS76 ICs
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Tutorial

Start by tapping on Next button.

1. Click on 'Next' button to Add IC-74LS76, 74LS08

Click on 'Next' button to Add IC-74LS76, 74LS08

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 Clock Pin-1 to clock port

Click on 'Next' button to Connect Clock Pin-1 to clock port

4. Click on 'Next' button to Connect J0, K0 to Vcc

Click on 'Next' button to Connect J0, K0 to Vcc

5. Click on 'Next' button to Connect QA to Output port

Click on 'Next' button to Connect QA to Output port

6. Click on 'Next' button to Connect -Q0 to J1,K1

Click on 'Next' button to Connect -Q0 to J1,K1

7. Click on 'Next' button to Connect Clock Pin-2 to clock port

Click on 'Next' button to Connect Clock Pin-2 to clock port

8. Click on 'Next' button to Connect QB to Output port

Click on 'Next' button to Connect QB to Output port

9. Click on 'Next' button to Connect -QB to Pin-1 of AND Gate

Click on 'Next' button to Connect -QB to Pin-1 of AND Gate

10. Click on 'Next' button to Connect -QA to Pin-2 of AND Gate

Click on 'Next' button to Connect -QA to Pin-2 of AND Gate

11. Click on 'Next' button to Connect Output-1 of AND Gate to J2,K2

Click on 'Next' button to Connect Output-1 of AND Gate to J2,K2

12. Click on 'Next' button to Connect Clock Pin-3 to clock port

Click on 'Next' button to Connect Clock Pin-3 to clock port

13. Click on 'Next' button to Connect Output-1 of AND Gate to Pin-4 of AND Gate

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

14. Click on 'Next' button to Connect QC to Output port

Click on 'Next' button to Connect QC to Output port

15. Click on 'Next' button to Connect -QC to Pin-5 of AND Gate

Click on 'Next' button to Connect -QC to Pin-5 of AND Gate

16. Click on 'Next' button to Connect Output-2 of AND Gate to J3,K3

Click on 'Next' button to Connect Output-2 of AND Gate to J3,K3

17. Click on 'Next' button to Connect Clock Pin-4 to clock port

Click on 'Next' button to Connect Clock Pin-4 to clock port

18. Click on 'Next' button to Connect QD to output port

Click on 'Next' button to Connect QD to output port

19. Click on 'Next' button to Connect CLEAR Pins of all ICs to Input port

Click on 'Next' button to Connect CLEAR Pins of all ICs to Input port

20. Click on 'Next' button to Connect PR Pins of all ICs to Vcc port

Click on 'Next' button to Connect PR Pins of all ICs to Vcc port

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 IC-74LS76, 74LS08
  2. Click on 'Next' button to Connect GND and VCC of ICs
  3. Click on 'Next' button to Connect Clock Pin-1 to clock port
  4. Click on 'Next' button to Connect J0, K0 to Vcc
  5. Click on 'Next' button to Connect QA to Output port
  6. Click on 'Next' button to Connect -Q0 to J1,K1
  7. Click on 'Next' button to Connect Clock Pin-2 to clock port
  8. Click on 'Next' button to Connect QB to Output port
  9. Click on 'Next' button to Connect -QB to Pin-1 of AND Gate
  10. Click on 'Next' button to Connect -QA to Pin-2 of AND Gate
  11. Click on 'Next' button to Connect Output-1 of AND Gate to J2,K2
  12. Click on 'Next' button to Connect Clock Pin-3 to clock port
  13. Click on 'Next' button to Connect Output-1 of AND Gate to Pin-4 of AND Gate
  14. Click on 'Next' button to Connect QC to Output port
  15. Click on 'Next' button to Connect -QC to Pin-5 of AND Gate
  16. Click on 'Next' button to Connect Output-2 of AND Gate to J3,K3
  17. Click on 'Next' button to Connect Clock Pin-4 to clock port
  18. Click on 'Next' button to Connect QD to output port
  19. Click on 'Next' button to Connect CLEAR Pins of all ICs to Input port
  20. Click on 'Next' button to Connect PR Pins of all ICs to Vcc port

Block Diagram

Block diagram representing pin diagram of 4 bit Synchronous DOWN counter using JK Flip flops 74LS76 with 74LS08 and 74LS76 ICs

ICs used in this circuit with pin diagram

Pin diagram of Quad 2-input AND Gates - 74LS08

74LS08

Quad 2-input AND Gates
Pin diagram of Dual Master-Slave J-K Flip-Flops with Clear, Preset, and Complementary Outputs - 74LS76

74LS76

Dual Master-Slave J-K Flip-Flops with Clear, Preset, and Complementary Outputs


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