Datasheet

305
2545T–AVR–05/11
ATmega48/88/168
29.3 Speed grades
Maximum frequency is dependent on V
CC.
As shown in Figure 29-1 and Figure 29-2, the Maxi-
mum Frequency vs. V
CC
curve is linear between 1.8V < V
CC
< 2.7V and between 2.7V < V
CC
<
4.5V.
Figure 29-1. Maximum frequency vs. V
CC
, Atmel ATmega48V/88V/168V.
Figure 29-2. Maximum frequency vs. V
CC
, ATmega48/88/168.
10MHz
4MHz
1.8V 2.7V 5.5V
Safe operating area
20MHz
10MHz
2.7V 4.5V 5.5V
Safe operating area