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Appendix A Electrical Characteristics
MC9S12HZ256 Data Sheet, Rev. 2.05
Freescale Semiconductor
625
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 ow 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 elds;
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 Ratings1
1 Beyond absolute maximum ratings device might be damaged.
Num
Rating
Symbol
Min
Max
Unit
1
I/O, Regulator and Analog Supply Voltage
VDD5
–0.3
6.0
V
2
Digital Logic Supply Voltage 2
VDD
–0.3
3.0
V
3
VDDPLL
–0.3
3.0
V
4
Voltage difference VDDX1 to VDDX2 to VDDM and
VDDA
VDDX
–0.3
0.3
V
5
Voltage difference VSSX to VSSR and VSSA
VSSX
–0.3
0.3
V
6
Digital I/O Input Voltage
VIN
–0.3
6.0
V
7
Analog Reference
VRH, VRL
–0.3
6.0
V
8
XFC, EXTAL, XTAL inputs
VILV
–0.3
3.0
V
9
TEST input
VTEST
–0.3
10.0
V
10
Instantaneous Maximum Current
Single pin limit for all digital I/O pins except PU and PV
3
I
D
–25
+25
mA
11
Instantaneous Maximum Current
Single pin limit for Port PU and PV 4
I
D
–55
+55
mA
12
Instantaneous Maximum Current
Single pin limit for XFC, EXTAL, XTAL5
I
DL
–25
+25
mA
13
Instantaneous Maximum Current
Single pin limit for TEST 6
I
DT
–0.25
0
mA
14
Storage Temperature Range
T
stg
– 65
155
°C