Flip Flop Counter 7-segment 4511 convergence issue

[techdude101]

I've build a counter using D Flip Flops and am trying to display it on a 7-segment display using a 4511 BCD decoder. I get a convergence error when I have the C output connected (on the second page) to the DC input of the 4511. If I disconnect the DC input the counter works fine and the binary count can be seen on the indicators on the first page.

Any help would be greatly appreciated.

[CharlotteN]

Hi techdude101,

take a look at this document here and try some of the steps towards the bottom. 

I found changing the RELTOL tolerance to 0.01 allowed your simulation to run okay. 

Hope that helps!

Charlotte N. 

Applications Engineer

[techdude101]

Thanks so much!!

Changing the RELTOL to 0.01 did the trick. 

I also got it to work by changing the 4511 BCD decoder to a 7447 with a comon anode 7-segment display.

I've bookmarked that link and sent it to all my tutors.

Thanks again 🙂

[CharlotteN]

Excellent, I'm glad your simulation is working. It is a very handy link as simulation errors such as yours are one of the most common Multisim issues.

Charlotte N.