[SI-LIST] differential trace mismatch

A question;

on a LVDS differential pair trace running 622MHz
clocks, I am using 10 mils as my trace length
differential maximum. This occurs at the footprint of
the package for routing purposes. Is this reasonable
or am I being too strict?
Second question, again at the package footprint the
differential pair must separate to attach to the via
array. What is a reasonable maximum length the traces
can be without maintaining the 100 Ohms? is 25 mils
reasonable?
Thanks in advance
Hans Mellberg

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