Freescale Semiconductor MC68HC08KH12 User Manual
MC68HC(7)08KH12
—
Rev. 1.1
Advance Information
Freescale Semiconductor
249
17.4 Functional Operating Range
17.5 Thermal Characteristics
Characteristic
Symbol
Value
Unit
Operating Temperature Range
T
A
0 to 85
°
C
Operating Voltage Range
V
DD
4.0 to 5.5
V
Characteristic
Symbol
Value
Unit
Thermal Resistance
QFP (64 Pins)
θ
JA
70
°C/W
I/O Pin Power Dissipation
P
I/O
User Determined
W
Power Dissipation
(1)
P
D
P
D
= (I
DD
x V
DD
) + P
I/O
=
K/(T
J
+ 273
°C)
W
Constant
(2)
K
P
D
x
(T
A
+ 273
°C
)
+ P
D
2
×
θ
JA
W/
°C
Average Junction Temperature
T
J
T
A
+ (P
D
× θ
JA
)
°C
Maximum Junction Temperature
T
JM
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 T
1. Power dissipation is a function of temperature.
2. K is a constant unique to the device. K can be determined for a known T
A
and measured
P
D.
With this value of K, P
D
and T
J
can be determined for any value of T
A
.