no, current sink looks great. nice and sharp. It's the pullup rise-times that show a lot of slope.

And I agree about the I2C requirements. So that's why I put in the different pullup. I had risetimes (measure 10-90% by my scope of around 25 and 26uS. Way too long.)

With 5.1K they are a lot like they should be. (I didn't measure since I compared against SCL's needed times and they look fine.)

-Ben