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| MC68HC908JB8 Datasheet, PDF (255/286 Pages) Motorola, Inc – MICROCONTROLLERS | |||
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18.4 Functional Operating Range
Characteristic
Operating temperature range
Operating voltage range
Electrical Specifications
Functional Operating Range
Symbol
Value
Unit
TA
0 to 70
°C
VDD
4.0 to 5.5
V
18.5 Thermal Characteristics
Characteristic
Thermal Resistance
QFP (44 pins)
SOIC (28 pins)
SOIC (20 pins)
PDIP (20 pins)
I/O pin power dissipation
Power dissipation(1)
Constant(2)
Average junction temperature
Maximum junction temperature
Symbol
Value
Unit
95
θJA
70
°C/W
70
70
PI/O
User determined
W
PD
PD = (IDD Ã VDD) + PI/O =
K/(TJ + 273 °C)
W
K
PD x (TA + 273 °C)
+ PD2 à θJA
W/°C
TJ
TA + (PD à θJA)
°C
TJM
100
°C
NOTES:
1. Power dissipation is a function of temperature.
2. K is a constant unique to the device. K can be determined for a known TA and
measured PD. With this value of K, PD and TJ can be determined for any value of TA.
MC68HC908JB8â¢MC68HC08JB8â¢MC68HC08JT8 â Rev. 2.3
Freescale Semiconductor
Electrical Specifications
Technical Data
255
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