Electrical Characteristics
MC9S12G Family Reference Manual Rev.1.27
NXP Semiconductors 1179
All VDDX pins are internally connected by metal.
All VSSX
pins are internally connected by metal.
VDDA, VDDX and VSSA, VSSX are connected by diodes for ESD protection.
NOTE
In the following context V
DD35
is used for either VDDA, VDDR, and
VDDX; V
SS35
is used for either VSSA and VSSX unless otherwise noted.
I
DD35
denotes the sum of the currents flowing into the VDDA, VDDX and
VDDR pins.
A.1.3 Pins
There are four groups of functional pins.
A.1.3.1 I/O Pins
The I/O pins have a level in the range of 3.13V to 5.5V. This class of pins is comprised of all port I/O pins,
the analog inputs, BKGD and the RESET pins. Some functionality may be disabled.
A.1.3.2 Analog Reference
This group consists of the VRH pin.
A.1.3.3 Oscillator
The pins EXTAL, XTAL dedicated to the oscillator have a nominal 1.8V level.
A.1.3.4 TEST
This pin is used for production testing only. The TEST pin must be tied to ground in all applications.
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.
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