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Electrical Specifications
19.3 Functional Operating Range
Characteristic
Operating temperature range
MC68HC908MR24CFU
MC68HC908MR24VFU
Operating voltage range
1. See Freescale representative for temperature availability.
C = Extended temperature range (–40°C to +85°C)
V = Automotive temperature range (–40°C to +105°C)
19.4 Thermal Characteristics
Characteristic
Thermal resistance,
64-pin QFP
I/O pin power dissipation
(1)
Power dissipation
(2)
Constant
Average junction temperature
Maximum junction temperature
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
T
can be determined for any value of T
J
266
(1)
.
A
MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1
Symbol
Value
T
–40 to 85
A
–40 to 105
5.0 ± 10%
V
DD
Symbol
Value
θ
JA
P
User determined
I/O
P
= (I
x V
D
DD
P
D
K/(T
J
P
x (T
D
K
+ P
T
T
+ (P
J
A
T
JM
and measured P
With this value of K, P
A
D.
Unit
°C
V
Unit
°C/W
76
W
) + P
=
DD
I/O
W
+ 273°C)
+ 273°C)
A
W/°C
2
x θ
D
JA
x θ
°C
)
D
JA
°C
125
and
D
Freescale Semiconductor
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