La verdad es que yo no haria tal cosa, no entiendo por que quieres meterle corriente al PIC. aunque todo lo pone en el data:
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15.0 ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings â€
Ambient temperature under bias................................................................................................................ .-55 to +125°C
Storage temperature .............................................................................................................................. -65°C to +150°C
Voltage on any pin with respect to VSS (except VDD, MCLR. and RA4) ....................................... -0.3 V to (VDD + 0.3 V)
Voltage on VDD with respect to VSS ........................................................................................................... -0.3 to +7.5 V
Voltage on MCLR with respect to VSS (Note 2) ................................................................................................0 to +14 V
Voltage on RA4 with respect to Vss .................................................................................................................0 to +8.5 V
Total power dissipation (Note 1) ..............................................................................................................................1.0 W
Maximum current out of VSS pin ...........................................................................................................................300 mA
Maximum current into VDD pin ..............................................................................................................................250 mA
Input clamp current, IIK (VI < 0 or VI > VDD)..................................................................................................................... ± 20 mA
Output clamp current, IOK (VO < 0 or VO > VDD) ............................................................................................................. ± 20 mA
Maximum output current sunk by any I/O pin..........................................................................................................25 mA
Maximum output current sourced by any I/O pin ....................................................................................................25 mA
Maximum current sunk by PORTA, PORTB, and PORTE (combined) (Note 3) ...................................................200 mA
Maximum current sourced by PORTA, PORTB, and PORTE (combined) (Note 3)..............................................200 mA
Maximum current sunk by PORTC and PORTD (combined) (Note 3) .................................................................200 mA
Maximum current sourced by PORTC and PORTD (combined) (Note 3) ............................................................200 mA
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Si nos explicas algo te podremos orientar de como medirlo.