Datasheet

Electrical Specifications
MC68HC908JL3E Family Data Sheet, Rev. 4
136 Freescale Semiconductor
16.3 Functional Operating Range
16.4 Thermal Characteristics
Table 16-2. Operating Range
Characteristic Symbol Value Unit
Operating temperature range
T
A
– 40 to +125 – 40 to +85 °C
Operating voltage range
V
DD
5 ±10% 3 ±10% V
Table 16-3. Thermal Characteristics
Characteristic Symbol Value Unit
Thermal resistance
20-pin PDIP
20-pin SOIC
28-pin PDIP
28-pin SOIC
48-pin LQFP
θ
JA
70
70
70
70
80
°C/W
°C/W
°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