Datasheet

Electrical Specifications
MC68HC908AP Family Data Sheet, Rev. 4
298 Freescale Semiconductor
22.3 Functional Operating Range
22.4 Thermal Characteristics
Table 22-2. Operating Range
Characteristic Symbol Value Unit
Operating temperature range
T
A
– 40 to +85 °C
Operating voltage range
V
DD
2.7 to 5.5 V
Table 22-3. Thermal Characteristics
Characteristic Symbol Value Unit
Thermal resistance
42-Pin SDIP
44-Pin QFP
48-Pin LQFP
θ
JA
60
95
80
°C/W
°C/W
°C/W
I/O pin power dissipation
P
I/O
User determined W
Power dissipation
(1)
1. Power dissipation is a function of temperature.
P
D
P
D
= (I
DD
× V
DD
) + P
I/O
=
K/(T
J
+ 273 °C)
W
Constant
(2)
2. K 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
.
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