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I have a question regarding my project. I am designing high speed output from my microcontroller.

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Switching times should be around 450 MHz, so I found IBIS model for my microcontroller and line driver, but when I have simulated reflections, the voltage level is wrong. It is 5V but should be 3.3V instead.

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I changed all voltage range of the pins to 3.3V, but it still doesn't work.

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Can someone tell me what am I doing wrong?

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