The sink current (low-level output current) is 15mA/pin MAX. and the total pin current value for P3 and P5 is up to 70mA for each pin.
The flow-out current from P5 (high-level output current) is 1mA/pin MAX. and the total for all chip pins is up to 15mA.
(Note that since P30 to P33 are open-drain outputs, there is no flow-out current from these pins.)
These characteristics are described in the data sheet.