MC9RS08LE4 Datasheet, PDF (6/30 Pages) Freescale Semiconductor, Inc – MCU Block Diagram

Absolute Maximum Ratings
NOTE
The classification is shown in the column labeled “C” in the parameter
tables where appropriate.
3.3 Absolute Maximum Ratings
Absolute maximum ratings are stress ratings only, and functional operation at the maxima is not
guaranteed. Stress beyond the limits specified in Table 3 may affect device reliability or cause permanent
damage to the device. For functional operating conditions, refer to the remaining tables in this chapter.
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_SS or V_DD) or the programmable
pull-up resistor associated with the pin is enabled.
Table 3. Absolute Maximum Ratings
Rating
Symbol
Value
Unit
Supply voltage
Maximum current into V_DD
Digital input voltage
Instantaneous maximum current
Single pin limit (applies to all port pins)^{1, 2, 3}
V_DD
2.7 to 5.5
V
I_DD
120
mA
V_In
–0.3 to V_DD + 0.3
V
I_D
±25
mA
Storage temperature range
T_stg
–55 to 150
°C
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_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 VSS and VDD except the RESET/VPP pin which is internally}
clamped to V_SS only.
3 _{Power supply must maintain regulation within operating VDD 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.
3.4 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 voltage regulator circuits and it is user-determined rather than being controlled by the
MCU design. In order to take PI/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.
MC9RS08LE4 MCU Data Sheet, Rev. 2
6
Freescale Semiconductor