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| MC68HC908AT32 Datasheet, PDF (360/378 Pages) Freescale Semiconductor, Inc – Microcontrollers | |||
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Electrical Specifications
29.2 Functional Operating Range
Rating
Operating temperature range
Operating voltage range
Symbol
Value
Unit
TA
â40 to 125
°C
VDD
5.0 ± 10%
V
29.3 Thermal Characteristics
Characteristic
Symbol
Value
Thermal resistance
QFP (64 pins)
θJA
70
Thermal resistance
PLCC (52 pins)
θJA
50
I/O pin power dissipation
Power dissipation(1)
Constant(2)
Average junction temperature
Maximum junction temperature
PI/O
User determined
PD
PD = (IDD x VDD) + PI/O =
K/(TJ + 273°C
K
PD x (TA + 273°C)
+ (PD2 x θJA)
TJ
TA = PD x θJA
TJM
125
1. Power dissipation is a function of temperature.
2. K is a constant unique to the device. K can be determined from a known TA and
measured PD. With this value of K, PD and TJ can be determined for any value of TA.
Unit
°C/W
°C/W
W
W
W/°C
°C
°C
MC68HC908AT32 Data Sheet, Rev. 3.1
360
Freescale Semiconductor
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