Hi,
Please check the table 5(pin description) from the datasheet below:
http://www.nxp.com/docs/en/data-sheet/LPC1769_68_67_66_65_64_63.pdf
In this table you can find a note about if this pin is 5v tolerant.


In addition please check the table 8. (static characteristics)

I hope this helps,
Have a great day,
Soledad
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