Hi,

I using a cmos 180nm technology. I have a digital buffer that have 20 mA peak, 0,6 mA average ans 3.8 mA rms.

So I have a general question about which current to use to check the minimum number of via, as the documentation of the design kit give only Jmax (maximum DC current density).

I know the saver way it to consider the maximum, but for density intergration I can't afford it unless it is a must!

Thank you to enlighten me about that point and to share your experience about routing constraint to deal with high AC current.

Regards,

KC

Except some extreme cases only the DC current matters, since the effect of AC currents on electromigration is some order of magnitude weaker.
Search for "AC current electromigration" if you want more detail.

Hi here is a good link I found that explain which current to consider depending of the current type (bidirectional or unidirectional):
http://www.masamb.com/EM-IITD.pdf

KC