AT90LS4433-4AI datasheet(101/126 Pages) ATMEL

101 / 126 page

101

AT90S/LS4433

1042H–AVR–04/03

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

L •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.

The difference between Power-down mode with Brown-out Detector enabled and

Power-down mode with Watchdog Timer disabled represents the differential current

drawn by the Brown-out Detector.

Figure 70. Active Supply Current vs. Frequency

ACTIVE SUPPLY CURRENT vs. FREQUENCY

TA = 25˚C

VCC = 6V

VCC = 5.5V

VCC = 5V

VCC = 4.5V

VCC = 4V

VCC = 3.6V

VCC = 3.3V

VCC = 3.0V

VCC = 2.7V

Frequency (MHz)

AT90LS4433-4AI Datasheet(PDF) 101 Page - ATMEL Corporation