ATMEGA32U6 Datasheet, PDF (414/459 Pages) ATMEL Corporation – 8-bit Microcontroller with 64/128K Bytes of ISP Flash and USB Controller

31.2 Output Voltage Levels
Figure 31-3. Output Low Voltage vs. Output Current, all I/Os excluding DP/DM, Vcc=3V
1.2
1
0.8
0.6
0.4
0.2
0
0
5
10
15
I_OL (mA)
85
25
-40
20
Figure 31-4. Output Low Voltage vs. Output Current, all I/Os excluding DP/DM, Vcc=5V
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
5
10
15
I_OL (mA)
85
25
-40
20
414 ATmega32U6/AT90USB64/128
7593H–AVR–11/08