MC9S08QG8_09 Datasheet, PDF (267/314 Pages) Freescale Semiconductor, Inc – HCS08 Microcontrollers

Appendix A
Electrical Characteristics
A.1 Introduction
This section contains electrical and timing specifications.
A.2 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 A-1 may affect device reliability or cause
permanent damage to the device. For functional operating conditions, refer to the remaining tables in this
section.
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 A-1. 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
–0.3 to +3.8
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.}
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).
MC9S08QG8 and MC9S08QG4 Data Sheet, Rev. 5
Freescale Semiconductor
265