The specifications say "Pins are NOT guaranteed to sink currrent
greater than the listed conditions-----" which does mean
that drain/collector current is LIMITED !
It is POSSIBLE that Vol may rise above listed condition,
but that doesnt matter with LED. What I had stated is actual
experimental stuff that is no variation of intensity in LED
from serries resistor from 33ohms to 150 ohms.
Also I did say that micro was much cooler with higher
resistor. So may be it is just arm chair throwing of specs
on some gullible person.
Has the person in question has reported anything?
A lot of other arm chair throwing about open drain port
is going on. The rise time is correctly one period of
RC constant which is 66% of of Vcc. Nothing more is reqd
for changing state from low to high. The 'ringing' and
other stuff is same. People have used such ports and WITH
4.7K resistors as pull ups. With serial frequencies of
100Khz max there is no such great ringing causing harm.
It is also presently not known what would be actual frequencies
of communication.
I see that some few 'expert' people have grabbed this forum
and instead of guiding people properly doing job of scarring
novice people. One person even has threatened not to post
unless people 'obey' his way!
What I have stated is by experience of manufacturing many
hundreds units. Not making any toy. Those who think of it as
toy should first experiment and then only post result!