Datasheet

348
7674F–AVR–09/09
ATmega164P/324P/644P
27.5 Threshold and Hysteresis
Figure 27-19. I/O Input Threshold Voltage vs. Vcc (V
IH
, I/O Pin Read as “1”)
Figure 27-20. I/O Input Threshold Voltage vs. Vcc (V
IL
, I/O Pin Read as “0”)
I/O PIN INPUT THRESHOLD VOLTAGE vs. V
CC
VIH, IO PIN READ AS '1'
0
0.5
1
1.5
2
2.5
3
3.5
1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
V
CC
(V)
Threshold (V)
125
85
25
-45
I/O PIN INPUT THRESHOLD VOLTAGE vs. V
CC
VIL, IO PIN REA D AS '0'
0
0.5
1
1.5
2
2.5
3
3.5
1.522.533.544.555.56
V
CC
(V)
Threshold (V)
125
85
25
-45