MC9S12HZ256 Datasheet, PDF (625/692 Pages) Freescale Semiconductor, Inc – HCS12 Microcontrollers

Appendix A Electrical Characteristics
A.1.4 Current Injection
Power supply must maintain regulation within operating V_DD5 or V_DD range during instantaneous and
operating maximum current conditions. If positive injection current (V_in > V_DD5) is greater than I_DD5, 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 V_SS5 or V_DD5).
Table A-1. Absolute Maximum Ratings¹
Num
Rating
Symbol
1 I/O, Regulator and Analog Supply Voltage
2 Digital Logic Supply Voltage ²
3 PLL Supply Voltage ²
4 Voltage difference VDDX1 to VDDX2 to VDDM and
VDDA
V_DD5
V_DD
V_DDPLL
∆_VDDX
5 Voltage difference VSSX to VSSR and VSSA
∆_VSSX
6 Digital I/O Input Voltage
V_IN
7 Analog Reference
V_RH, V_RL
8 XFC, EXTAL, XTAL inputs
V_ILV
9 TEST input
V_TEST
10 Instantaneous Maximum Current
I_D
Single pin limit for all digital I/O pins except PU and PV
3
11 Instantaneous Maximum Current
I
Single pin limit for Port PU and PV ⁴
D
12 Instantaneous Maximum Current
Single pin limit for XFC, EXTAL, XTAL⁵
I_DL
13 Instantaneous Maximum Current
Single pin limit for TEST ⁶
I_DT
14 Storage Temperature Range
T_stg
1 _{Beyond absolute maximum ratings device might be damaged.}
Min
–0.3
–0.3
–0.3
–0.3
–0.3
–0.3
–0.3
–0.3
–0.3
–25
–55
–25
–0.25
– 65
Max
Unit
6.0
V
3.0
V
3.0
V
0.3
V
0.3
V
6.0
V
6.0
V
3.0
V
10.0
V
+25
mA
+55
mA
+25
mA
0
mA
155
°C
MC9S12HZ256 Data Sheet, Rev. 2.04
Freescale Semiconductor
625