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MC9S12A128 Datasheet, PDF (59/92 Pages) Motorola, Inc – Microcontroller unit (MCU) | |||
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MC9S12A128 Device Guide â V01.01
A.1.4 Current Injection
Power supply must maintain regulation within operating VDD5 or VDD range during instantaneous and
operating maximum current conditions. If positive injection current (Vin > VDD5) is greater than IDD5, the
injection current may flow out of VDD5 and could result in external power supply going out of regulation.
Ensure external VDD5 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 VSS5 or VDD5).
Table A-1 Absolute Maximum Ratings(1)
Num
Rating
Symbol
Min
Max
Unit
1 I/O, Regulator and Analog Supply Voltage
VDD5
â0.3
6.0
V
2 Digital Logic Supply Voltage (2)
VDD
â0.3
3.0
V
3 PLL Supply Voltage 2
VDDPLL
â0.3
3.0
V
4
Voltage difference VDDX to VDDR and VDDA
5
Voltage difference VSSX to VSSR and VSSA
âVDDX
âVSSX
â0.3
â0.3
0.3
V
0.3
V
6 Digital I/O Input Voltage
VIN
â0.3
6.0
V
7 Analog Reference
VRH, VRL
â0.3
6.0
V
8 XFC, EXTAL, XTAL inputs
VILV
â0.3
3.0
V
9 TEST input
VTEST
â0.3
10.0
V
Instantaneous Maximum Current
10 Single pin limit for all digital I/O pins (3)
I
D
â25
+25
mA
Instantaneous Maximum Current
11 Single pin limit for XFC, EXTAL, XTAL(4)
IDL
â25
+25
mA
Instantaneous Maximum Current
12 Single pin limit for TEST (5)
IDT
â0.25
0
mA
13 Storage Temperature Range
Tstg
â65
155
°C
NOTES:
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.
5. This pin is clamped low to VSSPLL, but not clamped high. This pin must be tied low in applications.
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