AT91M40800-33AI Atmel, AT91M40800-33AI Datasheet - Page 4

• Manufacturer Part Number: AT91M40800-33AI
• Description: IC ARM7 MCU 100 TQFP
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91M40800-33AI

• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 33MHz
• Connectivity: EBI/EMI, UART/USART
• Peripherals: POR, WDT
• Number Of I /o: 32
• Program Memory Type: ROMless
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.6 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

Thermal and Reliability
Considerations
Thermal Data
Reliability Data
4
AT91M40800 Electrical Characteristics
In Table 4, the device lifetime is estimated with the MIL-217 standard in the “moderately
controlled” environmental model (this model is described as corresponding to an instal-
lation in a permanent rack with adequate cooling air), depending on the device Junction
Temperature. (For details see the section “Junction Temperature” on page 5.)
Note that the user must be extremely cautious with this MTBF calculation: as the MIL-
217 model is pessimistic with respect to observed values due to the way the data/mod-
els are obtained (test under severe conditions). The life test results that have been
measured are always better than the predicted ones.
Table 4. MTBF Versus Junction Temperature
Table 5 summarizes the thermal resistance data related to the package of interest.
Table 5. Thermal Resistance Data
The number of gates and the device die size are provided for the user to calculate reli-
ability data with another standard and/or in another environmental model.
Table 6. Reliability Data
Symbol
Parameter
Number of Logic Gates
Number of Memory Gates
Device Die Size
JA
JC
Junction Temperature (T
Parameter
Junction-to-ambient thermal
resistance
Junction-to-case thermal resistance
100
125
150
175
J
) (°C)
Condition
Estimated Lifetime (MTBF) (Year)
Still Air
Data
17.6
272
400
TQFP100
TQFP100
Package
40
22
12
7
1393C–ATARM–19-Nov-04
K gates
K gates
Typ
6.4
40
mm
Unit
2
Unit
°C/
W