Datasheet

4. Although each I/O port can source more than the test conditions (20mA at V
CC
= 5V, 10mA at V
CC
= 3V) under steady state conditions (non-transient), the following must be observed:
4.1. The sum of all I
OL
, for ports PB0-PB7, XTAL2, PD0-PD7 should not exceed 100mA.
4.2. The sum of all I
OH
, for ports PA0-PA3, PC0-PC7 should not exceed 100mA.
If I
OH
exceeds the test condition, V
OH
may exceed the related specification. Pins are not
guaranteed to source current greater than the listed test condition.
Related Links
Minimizing Power Consumption on page 59
29.2.1. Power Consumption
Table 29-3. ATmega644A DC Characteristics - T
A
= -40°C to 85°C, V
CC
= 1.8V to 5.5V (unless otherwise noted)
Symbol Parameter Condition Min. Typ.
(2)
Max. Units
I
CC
Power Supply Current
(1)
Active 1MHz, V
CC
= 2V - 0.38 0.5 mA
Active 4MHz, V
CC
= 3V - 1.8 2.7
Active 8MHz, V
CC
= 5V - 5.6 9.0
Idle 1MHz, V
CC
= 2V - 0.06 0.15
Idle 4MHz, V
CC
= 3V - 0.2 0.7
Idle 8MHz, V
CC
= 5V - 1.1 2.5
Power-save mode
(3)
32 kHz TOSC enabled, V
CC
= 1.8V - 0.5 -
32 kHz TOSC enabled, V
CC
= 3V - 0.6 -
Power-down mode
(3)
WDT enabled, V
CC
= 3V - 4.2 20 μA
WDT disabled, V
CC
= 3V - 0.15 3.0
Note:
1. All bits set in the ”PRR – Power Reduction Register ”.
2. Typical values at 25°C. Maximum values are test limits in production.
3. The current consumption values include input leakage current.
29.3. Speed Grades
Maximum frequency is dependent on V
CC.
As shown in Figure. Maximum Frequency vs. V
CC
, the
Maximum Frequency vs. V
CC
curve is linear between 1.8V < V
CC
< 2.7V and between 2.7V < V
CC
< 4.5V.
Atmel ATmega644A [DATASHEET]
Atmel-42716C-ATmega644A_Datasheet_Complete-10/2016
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