mcf51qe128 Freescale Semiconductor, Inc, mcf51qe128 Datasheet - Page 10

• Manufacturer Part Number: mcf51qe128
• Description: Mcf51qe Flexis 32-bit Coldfire? V1 Microcontroller
• 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
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
10
Thermal Characteristics
1
2
3
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 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
1
Single pin limit (applies to all port pins)
Operating temperature range
(packaged)
Maximum junction temperature
Thermal resistance
Thermal resistance
, the injection current may flow out of V
Depending on packaging.
Single-layer board
Four-layer board
64-pin LQFP
80-pin LQFP
64-pin LQFP
80-pin LQFP
MCF51QE128 Series Advance Information Data Sheet, Rev. 4
Rating
Rating
DD
Table 4. Absolute Maximum Ratings
J
) in °C can be obtained from:
Table 5. Thermal Characteristics
SS
or V
DD
DD
load will shunt current greater than maximum injection
1, 2, 3
and multiply by the pin current for each I/O pin. Except in cases of
DD
Symbol
and could result in external power supply going
T
θ
θ
T
JM
JA
JA
A
Symbol
V
T
I
V
DD
I
DD
stg
D
SS
In
DD
(–40 to 85 or 0 to 70)
and V
range during instantaneous and
I/O
into account in power calculations, determine
DD
T
Value
–0.3 to V
DD
SS
L
) and negative (V
95
69
60
50
47
to T
–0.3 to +3.8
.
or V
In
–55 to 150
> V
Value
H
± 25
120
DD
DD
DD
will be very small.
) is greater than
+ 0.3
1
°C/W
°C/W
Freescale Semiconductor
SS
Unit
°C
°C
) clamp
Unit
mA
mA
°C
V
V