Datasheet

377
ATmega640/1280/1281/2560/2561
2549K–AVR–01/07
Maximum speed vs. V
CC
Maximum frequency is depending on V
CC.
As shown in Figure 156 trough Figure 159,
the Maximum Frequency vs. V
CC
curve is linear between 1.8V < V
CC
< 2.7V and
between 2.7V < V
CC
< 4.5V.
8 MHz Figure 156. Maximum Frequency vs. V
CC
, ATmega640V/1280V/1281V/2560V/2561V
Figure 157. Maximum Frequency vs. V
CC
when only using No-Read-While-Write Sec-
tion
(1)
, ATmega2560V/ATmega2561V
Note: 1. When only using the Read-While-Write Section of the program memory, a higher
speed can be achieved at low voltage, see “Read-While-Write and No Read-While-
Write Flash Sections” on page 323 for addresses.
8 MHz
4 MHz
1.8V 2.7V 5.5V
Safe Operating Area
8 MHz
2 MHz
1.8V 2.7V 5.5V
Safe Operating Area