mc9s08qb8 Freescale Semiconductor, Inc, mc9s08qb8 Datasheet - Page 8

• Manufacturer Part Number: mc9s08qb8
• Description: 8-bit Hcs08 Central Processor Unit
• Manufacturer: Freescale Semiconductor, Inc

Electrical Characteristics
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
voltage and V
pin current (heavy loads), the difference between pin voltage and V
The average chip-junction temperature (T
where:
8
Thermal Characteristics
Operating temperature range (packaged)
Maximum junction temperature
Thermal resistance 28-pin SOIC
Thermal resistance 24-pin QFN
Thermal resistance 16-pin TSSOP
1
2
3
SS
Supply voltage
Maximum current into V
Digital input voltage
Instantaneous maximum current
Storage temperature range
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
Single pin limit (applies to all port pins)
or V
, the injection current may flow out of V
DD
I/O
and multiply by the pin current for each I/O pin. Except in cases of unusually high
into account in power calculations, determine the difference between actual pin
Rating
Rating
MC9S08QB8 Series MCU Data Sheet, Rev. 2
DD
Table 3. Absolute Maximum Ratings
Table 4. Thermal Characteristics
T
J
J
) in °C can be obtained from:
= T
DD
A
load will shunt current greater than maximum injection
+ (P
1, 2, 3
DD
D
and could result in external power supply going
Symbol
× θ
T
θ
T
JM
JA
JA
A
)
Symbol
V
T
I
V
DD
I
DD
stg
D
In
DD
range during instantaneous and
SS
DD
–0.3 to V
) and negative (V
or V
–40 to 85
T
In
–0.3 to 3.8
–55 to 150
Value
L
129
> V
95
70
92
to T
Value
120
±25
DD
SS
DD
DD
H
) is greater than
and V
will be very small.
+ 0.3
DD
Freescale Semiconductor
SS
.
) clamp
Unit
mA
mA
°C
V
V
°C/W
°C/W
°C/W
Unit
°C
°C
Eqn. 1