mcf51mm256 Freescale Semiconductor, Inc, mcf51mm256 Datasheet - Page 16

• Manufacturer Part Number: mcf51mm256
• Description: 32-bit Coldfire V1 Central Processor Unit
• Manufacturer: Freescale Semiconductor, Inc

Preliminary Electrical Characteristics
This device contains circuitry protecting against damage due to high static voltage or electrical fields;
however, it is advised that normal precautions be taken to avoid application of any voltages higher than
maximum-rated voltages to this high-impedance circuit. Reliability of operation is enhanced if unused
inputs are tied to an appropriate logic voltage level (for instance, either V
3.3
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 it is user-determined rather than being controlled by the MCU design. In order to take
P
V
loads), the difference between pin voltage and V
16
I/O
DD
into account in power calculations, determine the difference between actual pin voltage and V
and multiply by the pin current for each I/O pin. Except in cases of unusually high pin current (heavy
1
2
3
Thermal Characteristics
calculate resistance values for positive (V
resistance values.
All functional non-supply pins are internally clamped to V
Power supply must maintain regulation within operating V
current conditions. If positive injection current (V
V
greater than maximum injection 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).
#
1
2
3
4
5
Input must be current limited to the value specified. To determine the value of the required current-limiting resistor,
DD
and could result in external power supply going out of regulation. Ensure external V
Supply voltage
Maximum current into V
Digital input voltage
Instantaneous maximum current
Storage temperature range
Single pin limit (applies to all port pins)
Rating
Table 5. Absolute Maximum Ratings
DD
DD
) and negative (V
In
SS
> V
1, 2, 3
DD
or V
) is greater than I
SS
DD
and V
DD
range during instantaneous and operating maximum
SS
) clamp voltages, then use the larger of the two
will be very small.
DD
Symbol
.
V
T
I
V
DD
I
DD
stg
D
In
DD
, the injection current may flow out of
–0.3 to V
SS
–0.3 to +3.8
–55 to 150
or V
DD
Value
± 25
120
load will shunt current
DD
DD
+ 0.3
).
Freescale Semiconductor
Unit
mA
mA
°C
V
V
SS
or