Datasheet

Electrical Specifications
Functional Operating Range
MC68HC908QY4•MC68HC908QT4•MC68HC908QY2•MC68HC908QT2•MC68HC908QY1•MC68HC908QT1
MOTOROLA Electrical Specifications 213
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18.4 Functional Operating Range
18.5 Thermal Characteristics
Characteristic Symbol Value Unit
Operating temperature range
T
A
– 40 to +125
– 40 to +85
– 40 to +125
– 40 to +85
°C
Operating voltage range
V
DD
5 V ± 10% 3 V ± 10% V
Characteristic Symbol Value Unit
Thermal resistance
8-pin PDIP
8-pin SOIC
16-pin PDIP
16-pin SOIC
16-pin TSSOP
θ
JA
95
70
66
70
70
°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
x 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
x θ
JA
W/°C
Average junction temperature
T
J
T
A
+ (P
D
x θ
JA
)
°C
Maximum junction temperature
T
JM
100 °C