33.1.7 Pin Driver Strength Figure 33-18. I/O Pin Output Voltage vs. Source Current (VCC = 5V) Figure 33-19. I/O Pin Output Voltage vs. Source Current (VCC = 3V) Figure 33-20. I/O Pin Output Voltage vs. Sink Current (VCC = 5V) Figure 33-21. I/O Pin Output Voltage vs. Sink Current (VCC = 3V)