MC3S12RG128 Datasheet, PDF (509/546 Pages) Freescale Semiconductor, Inc – Microcontrollers

Appendix A Electrical Characteristics
A.1.4 Current Injection
Power supply must maintain regulation within operating V_DD35 or V_DD range during instantaneous and
operating maximum current conditions. If positive injection current (V_in > V_DD35) is greater than I_DD35,
the injection current may flow out of V_DD35 and could result in external power supply going out of
regulation. Ensure external V_DD35 load will shunt current greater than maximum injection current. This
will be the greatest risk when the MCU is not consuming power; e.g. if no system clock is present, or if
clock rate is very low which would reduce overall power consumption.
A.1.5 Absolute Maximum Ratings
Absolute maximum ratings are stress ratings only. A functional operation under or outside those maxima
is not guaranteed. Stress beyond those limits may affect the reliability or cause permanent damage of the
device.
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 (e.g., either V_SS35 or V_DD35).
Table A-1. Absolute Maximum Ratings¹
Num
Rating
Symbol
Min
Max
Unit
1 I/O, Regulator and Analog Supply Voltage
2 Internal Logic Supply Voltage ²
3 PLL Supply Voltage ²
4 Voltage difference VDDX to VDDR and VDDA
5 Voltage difference VSSX to VSSR and VSSA
6 Digital I/O Input Voltage
7 Analog Reference
8 XFC, EXTAL, XTAL inputs
9 TEST input (for test purposes only, tie to V_SS)
10 Instantaneous Maximum Current
Single pin limit for all digital I/O pins ³
V_DD35
V_DD
V_DDPLL
∆_VDDX
∆_VSSX
V_IN
V_RH, V_RL
V_ILV
V_TEST
I
D
−0.3
−0.3
−0.3
−0.3
−0.3
−0.3
−0.3
−0.3
−0.3
−25
6.5
V
3.0
V
3.0
V
0.3
V
0.3
V
6.5
V
6.5
V
3.0
V
6.5
V
25
mA
11 Instantaneous Maximum Current
Single pin limit for XFC, EXTAL, XTAL⁴
I_DL
−25
25
mA
15 Storage Temperature Range
T_stg
–65
155
°C
1 _{Beyond absolute maximum ratings device might be damaged.}
2 _{The device contains an internal voltage regulator to generate the logic and PLL supply out of the I/O supply. The}
absolute maximum ratings apply when the device is powered from an external source.
3 _{All digital I/O pins are internally clamped to VSSX and VDDX, VSSR and VDDR or VSSA and VDDA.}
4 _{Those pins are internally clamped to VSSPLL and VDDPLL.}
MC3S12RG128 Data Sheet, Rev. 1.05
Freescale Semiconductor
509