Datasheet

329
8011O–AVR–07/10
ATmega164P/324P/644P
25.2 Speed Grades
Maximum frequency is depending on V
CC.
As shown in Figure 25-1 and Figure 25-2, 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 25-1. Maximum Frequency vs. V
CC
, ATmega164PV/ATmega324PV/ATmega644PV
Figure 25-2. Maximum Frequency vs. V
CC
, ATmega164P/324P/644P
10 MHz
4 MHz
1.8V 2.7V 5.5V
Safe Operating Area
20 MHz
10 MHz
2.7V 4.5V 5.5V
Safe Operating Area