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ATMEGA261_10 Datasheet, PDF (202/226 Pages) ATMEL Corporation – High Performance, Low Power AVR® 8-Bit Microcontroller
24.6 Pin Driver Strength
Figure 24-8. I/O Pin Output Voltage vs. Sink Current (VCC = 3V)
Figure 24-9. I/O Pin Output Voltage vs. Sink Current (VCC = 5V)
202 ATtiny261/ATtiny461/ATtiny861
7753E–AVR–06/10