Datasheet

Electrical Specifications
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
366 Freescale Semiconductor
28.1.2 Functional Operating Range
NOTE
For applications which use the LVI, Freescale guarantees the functionality
of the device down to the LVI trip point (V
LVI
) within the constraints outlined
in Chapter 16 Low-Voltage Inhibit (LVI).
28.1.3 Thermal Characteristics
Rating Symbol Value Unit
Operating Temperature Range
(1)
1. T
A
(MAX) = 125°C for part suffix MFU/MFN
T
A
(MAX) = 105°C for part suffix VFU/VFN
T
A
(MAX) = 85°C for part suffix CFU/CFN
T
A
–40 to T
A
(MAX)
°C
Operating Voltage Range
V
DD
5.0 ± 0.5 V
Characteristic Symbol Value Unit
Thermal Resistance
QFP (64 Pins)
θ
JA
70 °C/W
Thermal Resistance
PLCC (52 Pins)
θ
JA
50 °C/W
I/O Pin Power Dissipation
P
I/O
User Determined W
Power Dissipation (see Note 1)
P
D
P
D
= (I
DD
x V
DD
) + P
I/O
=
K/(T
J
+ 273 °C)
W
Constant (see Note 2) 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
1. Power dissipation is a function of temperature.
2. K is a constant unique to the device. K can be determined from 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
.