Datasheet

Electrical Specifications
Functional Operating Range
MC68HC908GR8 — Rev 4.0 Technical Data
MOTOROLA Electrical Specifications 363
23.3 Functional Operating Range
NOTE: To ensure correct operation of the MCU under all operating conditions,
the user must write data $1C to address $0033 immediately after reset.
This is to ensure proper termination of an unused module within the
MCU.
23.4 Thermal Characteristics
Table 23-2. Functional Operation Range
Characteristic Symbol Value Unit
Operating temperature range
T
A
–40 to +125 °C
Operating voltage range
V
DD
3.0 ±10%
5.0
±10%
V
Table 23-3. Thermal Characteristics
Characteristic Symbol Value Unit
Thermal resistance
PDIP (28-pin)
SOIC (28-pin)
QFP (32-pin)
θ
JA
60
60
95
°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 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
.
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
140 °C
Notes:
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
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