ATMEGA649 Datasheet, PDF (337/375 Pages) ATMEL Corporation – 8-bit Microcontroller with In-System Programmable Flash

ATmega329/3290/649/6490
Pin Thresholds and hysteresis Figure 174. I/O Pin Input Threshold Voltage vs. V_CC (V_IH, I/O Pin Read as “1”)
I/O PIN INPUT THRESHOLD VOLTAGE vs. V_CC
VIH, I/O PIN READ AS '1'
3
85°C
25°C
-40°C
2.5
2
1.5
1
0.5
0
1.5
2
2.5
3
3.5
4
4.5
5
5.5
V_CC (V)
Figure 175. I/O Pin Input Threshold Voltage vs. V_CC (V_IL, I/O Pin Read as “0”)
I/O PIN INPUT THRESHOLD VOLTAGE vs. V_CC
VIL, I/O PIN READ AS '0'
3
2.5
85°C
25°C
-40°C
2
1.5
1
0.5
0
1.5
2
2.5
3
3.5
4
4.5
5
5.5
V_CC (V)
2552H–AVR–11/06
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