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Typical
Characteristics
0838H–AVR–03/02
The following charts show typical behavior. These figures are not tested during manu-
facturing. All current consumption measurements are performed with all I/O pins
configured as inputs and with internal pull-ups enabled. A sine wave generator with rail-
to-rail output is used as clock source.
The power consumption in Power-down mode is independent of clock selection.
The current consumption is a function of several factors such as: operating voltage,
operating frequency, loading of I/O pins, switching rate of I/O pins, code executed and
ambient temperature. The dominating factors are operating voltage and frequency.
The current drawn from capacitive loaded pins may be estimated (for one pin) as
C
• V
• f where C
= load capacitance, V
L
CC
L
switching frequency of I/O pin.
The parts are characterized at frequencies higher than test limits. Parts are not guaran-
teed to function properly at frequencies higher than the ordering code indicates.
The difference between current consumption in Power-down mode with Watchdog
Timer enabled and Power-down mode with Watchdog Timer disabled represents the dif-
ferential current drawn by the Watchdog Timer.
Figure 38. Active Supply Current vs. Frequency
18
16
14
12
10
8
6
4
2
0
0
1
2
3
= operating voltage and f = average
CC
ACTIVE SUPPLY CURRENT vs. FREQUENCY
T = 25˚C
A
4
5
6
7
8
9
Frequency (MHz)
AT90S1200
V
= 3.3V
cc
V
= 3.0V
cc
V
= 2.7V
cc
10
11
12
13
14
15
V
= 6V
cc
V
= 5.5V
cc
V
= 5V
cc
V
= 4.5V
cc
V
= 4V
cc
V
= 3.6V
cc
16
51
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