Freescale Semiconductor DEMO9S08DZ60 Demo Board DEMO9S08DZ60 DEMO9S08DZ60 数据表
产品代码
DEMO9S08DZ60
Appendix A Electrical Characteristics
MC9S08DZ60 Series Data Sheet, Rev. 4
370
Freescale Semiconductor
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
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
SS
or V
DD
).
A.4
Thermal Characteristics
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
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
I/O
into account in power calculations, determine the difference between actual pin voltage and V
SS
or
V
DD
and multiply by the pin current for each I/O pin. Except in cases of unusually high pin current (heavy
loads), the difference between pin voltage and V
SS
or V
DD
will be very small.
Table A-2. Absolute Maximum Ratings
Num
Rating
Symbol
Value
Unit
1
Supply voltage
V
DD
–0.3 to + 5.8
V
2
Input voltage
V
In
– 0.3 to V
DD
+ 0.3
V
3
Instantaneous maximum current
Single pin limit
(applies to all port pins)
1, 2, 3
1
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
current-limiting resistor, calculate resistance values for positive (V
DD
) and negative (V
SS
) clamp
voltages, then use the larger of the two resistance values.
2
All functional non-supply pins are internally clamped to V
SS
and V
DD
.
3
Power supply must maintain regulation within operating V
DD
range during instantaneous and operating
maximum current conditions. If positive injection current (V
In
> V
DD
) is greater than I
DD
, the injection
current may flow out of V
DD
and could result in external power supply going out of regulation. Ensure
external V
DD
load will shunt current 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.
rate is very low which would reduce overall power consumption.
I
D
±
25
mA
4
Maximum current into V
DD
I
DD
120
mA
5
Storage temperature
T
stg
–55 to +150
°
C