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Has VOH and VOL been measured with 3.3V supply and 500uA output current? Supply voltages only up to 3V are specified in DS. If this information does not exist, what estimate can be used?
Rgds,
Juha
In practice, 3 V is the worst case of a 3.3 V ± 10 % supply, so you should use the 3 V values.