mc9s08qe4 Freescale Semiconductor, Inc, mc9s08qe4 Datasheet - Page 9

• Manufacturer Part Number: mc9s08qe4
• Description: 8-bit Hcs08 Central Processor Unit
• Manufacturer: Freescale Semiconductor, Inc

3.4
This section provides information about operating temperature range, power dissipation, and package thermal resistance. Power
dissipation on I/O pins is usually small compared to the power dissipation in on-chip logic and voltage regulator circuits, and
it is user-determined rather than being controlled by the MCU design. To take P
the difference between actual pin voltage and V
unusually high pin current (heavy loads), the difference between pin voltage and V
The average chip-junction temperature (T
where:
Freescale Semiconductor
Thermal Characteristics
1
2
3
current-limiting resistor, calculate resistance values for positive (V
voltages, then use the larger of the two resistance values.
All functional non-supply pins, except for PTA5 are internally clamped to V
Power supply must maintain regulation within operating V
operating maximum current conditions. If positive injection current (V
I
out of regulation. Ensure external V
current. This will be the greatest risk when the MCU is not consuming power. Examples are: if
no system clock is present, or if the clock rate is very low (which would reduce overall power
consumption).
Input must be current limited to the value specified. To determine the value of the required
DD
, the injection current may flow out of V
Operating temperature range
(packaged)
Maximum junction temperature
Thermal resistance
Thermal resistance
Single-layer board
Four-layer board
32-pin LQFP
28-pin SOIC
20-pin SOIC
16-pin PDIP
16-pin TSSOP
32-pin LQFP
28-pin SOIC
20-pin SOIC
16-pin PDIP
16-pin TSSOP
Rating
J
) in qC can be obtained from:
Table 4. Thermal Characteristics
Subject to Change Without Notice
SS
T
MC9S08QE8 Series, Rev. 3
J
or V
= T
DD
A
DD
load will shunt current greater than maximum injection
+ (P
Preliminary
and multiply by the pin current for each I/O pin. Except in cases of
DD
D
and could result in external power supply going
Symbol
u T
T
T
T
T
JM
JA
JA
JA
A
)
DD
range during instantaneous and
I/O
into account in power calculations, determine
–40 to 85
DD
T
Value
SS
L
108
) and negative (V
95
66
57
71
64
47
42
52
47
78
to T
In
or V
> V
H
DD
SS
DD
will be very small.
) is greater than
and V
qC/W
qC/W
Electrical Characteristics
Unit
DD
qC
qC
SS
.
) clamp
Eqn. 1
9