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cd4018 wrong type of counter

Hello,

 

The cd4018 Johnson counter seems to be modeled wrong.  It appears to be modeled as a bucket brigade counter rather than a Johnson counter.

For an example of how it is supposed to work, see figure 15 of the data sheet from Texas Instruments.

 

http://www.icmaster.com/search/Preview.do?v=1

 

Compare this to the output from the circuit the I simulated in the attached file.

Would it be possible to get an update to the libraries with corrections to the models for the cmos and TTL IC's?

 

Thanks.

 

 

 

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After I posted, I found that the link to the data sheet did not work.  Here is a link directly from TI for the data sheet for the CD4018 counter.

http://focus.ti.com/lit/ds/symlink/cd4018b.pdf

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Hi Eric,

 

I was able to verify the problem and I will ask R&D to look into this problem

 

Tien P.

National Instruments
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