mcf51ac256 Freescale Semiconductor, Inc, mcf51ac256 Datasheet - Page 15

• Manufacturer Part Number: mcf51ac256
• Description: Mcf51ac256 Coldfire Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

2.3
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
actual pin voltage and V
(heavy loads), the difference between pin voltage and V
Freescale Semiconductor
Thermal Characteristics
1
2
3
1
Supply voltage
Input voltage
Instantaneous maximum current
Single pin limit (applies to all port pins)
Maximum current into V
Storage temperature
Operating temperature range (packaged)
Maximum junction temperature
Thermal resistance
80-pin LQFP
64-pin LQFP
64-pin QFP
Input must be current limited to the value specified. To determine the value of the required
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.
Junction temperature is a function of die size, on-chip power dissipation, package thermal
resistance, mounting site (board) temperature, ambient temperature, air flow, power dissipation
of other components on the board, and board thermal resistance.
DD
, the injection current may flow out of V
SS
or V
DD
MCF51AC256 ColdFire Microcontroller Data Sheet, Rev.1
and multiply by the pin current for each I/O pin. Except in cases of unusually high pin current
1,2,3,4
Rating
Preliminary—Subject to Change Without Notice
DD
Rating
Table 6. Absolute Maximum Ratings
Table 7. Thermal Characteristics
DD
1
I/O
,
load will shunt current greater than maximum injection
SS
2
,
into account in power calculations, determine the difference between
3
or V
DD
and could result in external power supply going
DD
2s2p
2s2p
2s2p
will be very small.
1s
1s
1s
Symbol
T
V
V
I
I
DD
stg
DD
SS
D
In
DD
Symbol
and V
range during instantaneous and
θ
T
T
JA
A
J
DD
DD
–0.3 to V
) and negative (V
.
In
–0.3 to 5.8
–55 to 150
Preliminary Electrical Characteristics
> V
–40 to 105
Value
120
±25
Value
DD
TBD
TBD
TBD
TBD
TBD
TBD
150
DD
) is greater than
+ 0.3
SS
) clamp
°C/W
Unit
Unit
mA
mA
°C
°C
°C
V
V
15