Hm... that part is "TTL/MOS Input/Output Compatible"... it shouldn't be a problem, should it Marcus?
But yes, don't connect anything above 3.3v to the GPIO pins (or 3.6v if you take it to the extreme maximum rating )
But yes, don't connect anything above 3.3v to the GPIO pins (or 3.6v if you take it to the extreme maximum rating )