[求助]关于open drain端口上拉电阻的设置？

vcar

open drain端口使用的上拉电阻驱动５Ｖ　ＣＭＯＳ，电阻阻值多大合适啊？
我用的是Acex 1K30，VCCINT = 2.5V, VCCIO = 3.3V
AN107上面的资料，但是没有说明到底是多大的电阻？只是说不能太大也不能太小：
To pull the output of a low-voltage device up to the V
IH
(input high) level
of a 5.0-V CMOS device, use an open-drain pin driving a trace that is
pulled up to 5.0 V through an external pull-up resistor (see Figure 4).
Choose a pull-up resistor that is small enough for a sufficient signal rise
time, but large enough that it does not violate the I
OL
(output low)
specifications of devices driving that trace.