Electrical Characteristics
Functional Operating Range
MC68HC11E Family
—
Rev. 4
Technical Data
MOTOROLA
Electrical Characteristics
223
11.4 Functional Operating Range
11.5 Thermal Characteristics
Rating
Symbol
Value
Unit
Operating temperature range
MC68HC(7)11Ex
MC68HC(7)11ExC
MC68HC(7)11ExV
MC68HC(7)11ExM
MC68HC811E2
MC68HC811E2C
MC68HC811E2V
MC68HC811E2M
MC68L11Ex
T
A
T
L
to T
H
0 to +70
–
40 to +85
–
40 to +105
–
40 to +125
0 to +70
–
40 to +85
–
40 to +105
–
40 to +125
–
20 to +70
°
C
Operating voltage range
V
DD
5.0
±
10%
V
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)
48-pin plastic DIP (MC68HC811E2 only)
56-pin plastic SDIP
52-pin plastic leaded chip carrier
52-pin plastic thin quad flat pack (TQFP)
64-pin quad flat pack
Θ
JA
50
50
50
85
85
°
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
K / 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