AT90S1200
Typical
Characteristics
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
CL • VCC • f where CL = load capacitance, VCC = operating voltage and f = average
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
ACTIVE SUPPLY CURRENT vs. FREQUENCY
T = 25˚C
A
18
16
14
12
10
8
Vcc= 6V
Vcc= 5.5V
Vcc= 5V
Vcc= 4.5V
Vcc= 4V
Vcc= 3.6V
6
Vcc= 3.3V
Vcc= 3.0V
4
Vcc= 2.7V
2
0
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Frequency (MHz)
51
0838H–AVR–03/02
ATMEL [ ATMEL ]
