MC9S08AC16_0911 Datasheet, PDF (294/336 Pages) Freescale Semiconductor, Inc – HCS08 Microcontrollers

Appendix A Electrical Characteristics and Timing Specifications
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).
Table A-2. Absolute Maximum Ratings
Rating
Symbol
Value
Unit
Supply voltage
Input voltage
Instantaneous maximum current
Single pin limit (applies to all port pins)¹, ², ³
V_DD
V_In
I_D
–0.3 to + 5.8
V
– 0.3 to V_DD + 0.3 V
± 25
mA
Maximum current into V_DD
I_DD
120
mA
Storage temperature
T_stg
–55 to +150
°C
Maximum junction temperature
T_J
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.}
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.
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_I/O into account in power calculations, determine the difference between actual pin voltage and V_SS or
MC9S08AC16 Series Data Sheet, Rev. 8
294
Freescale Semiconductor