The max source or sink current for any digital I/O pin is 25mA. The relevant spec is ID in Table 1.4. This is the maximum that the user should limit their loading to.
However, the output high or low voltage level at this load is not specified – we only specify worst case VOL & VOH loads in Table 3. This includes the total for all ports (IOLT and IOHT).
It will be difficult to get 25mA out of the normal drive pins since the VOH/VOL level will be degraded. The high drive pins are meant to be used for driving (sourcing and sinking) higher loads.
Best Regards,
Robin
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