
Electrical Specifications
Technical Data
MC68HC912DG128 — Rev 3.0
386
Electrical Specifications
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MOTOROLA
19.3 Tables of Data
Table 19-1. Maximum Ratings
(1)
1. Permanent damage can occur if maximum ratings are exceeded. Exposures to voltages or currents in excess of recommend-
ed values affects device reliability. Device modules may not operate normally while being exposed to electrical extremes.
2. One pin at a time, observing maximum power dissipation limits. Internal circuitry protects the inputs against damage
caused by high static voltages or electric fields; however, normal precautions are necessary to avoid application of any
voltage higher than maximum-rated voltages to this high-impedance circuit. Extended operation at the maximum ratings
can adversely affect device reliability. Tying unused inputs to an appropriate logic voltage level (either GND or V
DD
) en-
hances reliability of operation.
Rating
Symbol
Value
Unit
Supply voltage
V
DD
,
V
DDA
,
V
DDX
0.3 to
+
6.5
V
Input voltage
V
IN
0.3 to
+
6.5
V
Operating temperature range
68HC912DG128PV8
68HC912DG128CPV8
68HC912DG128VPV8
68HC912DG128MPV8
T
A
T
L
to T
H
0 to
+
70
40 to
+
85
40 to
+
105
40 to
+
125
°
C
Storage temperature range
T
stg
55 to
+
150
°
C
Current drain per pin
(2)
Excluding V
DD
and V
SS
I
IN
±
25
mA
V
DD
differential voltage
V
DD
V
DDX
6.5
V
Table 19-2. Thermal Characteristics
Characteristic
Symbol
Value
Unit
Average junction temperature
T
J
T
A
+
(P
D
×
Θ
JA
)
°
C
Ambient temperature
T
A
User-determined
°
C
Package thermal resistance (junction-to-ambient)
112-pin quad flat pack (QFP)
Θ
JA
40
°
C/W
Total power dissipation
(1)
1. This is an approximate value, neglecting P
I/O
.
2. For most applications P
I/O
P
INT
and can be neglected.
3. K is a constant pertaining to the device. Solve for K with a known T
A
and a measured P
D
(at equilibrium). Use this value of
K to solve for P
D
and T
J
iteratively for any value of T
A
.
P
D
P
INT
+
P
I/O
or
T
J
273
°
C
+
W
Device internal power dissipation
P
INT
I
DD
×
V
DD
W
I/O pin power dissipation
(2)
P
I/O
User-determined
W
A constant
(3)
K
P
D
×
(T
A
+
273
°
C)
+
Θ
JA
×
P
D2
W ·
°
C
-------------------------
F
Freescale Semiconductor, Inc.
n
.