Datasheet

ATmega164A/PA/324A/PA/644A/PA/1284/P
 2018 Microchip Technology Inc. Data Sheet Complete DS40002070A-page 332
28.2 Speed grades
Maximum frequency is depending on V
CC
. As shown in Figure 28-1, the maximum frequency vs. V
CC
curve is
linear between 1.8V < V
CC
< 2.7V and between 2.7V < V
CC
< 4.5V.
Figure 28-1. Maximum frequency vs. V
CC
, ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P
4MHz
1.8V 2.7V 4.5V
10MHz
20MHz
5.5V
Safe operating area