Chapter 3 Electrical Characteristics and Timing Specifications
Table 3-2. Absolute Maximum Ratings
Rating
Supply voltage
Input voltage
Instantaneous maximum current
Single pin limit (applies to all port pins)
1
,
2
,
3
Maximum current into V
DD
Storage temperature
1
Symbol
V
DD
V
In
I
D
I
DD
T
stg
Value
–0.3 to + 5.8
– 0.3 to V
DD
+ 0.3
±
25
120
–55 to +150
Unit
V
V
mA
mA
°C
2
3
Input must be current limited to the value specified. To determine the value of the required
current-limiting resistor, calculate resistance values for positive (V
DD
) and negative (V
SS
) clamp
voltages, then use the larger of the two resistance values.
All functional non-supply pins are internally clamped to V
SS
and V
DD
.
Power supply must maintain regulation within operating V
DD
range during instantaneous and
operating maximum current conditions. If positive injection current (V
In
> V
DD
) is greater than
I
DD
, the injection current may flow out of V
DD
and could result in external power supply going
out of regulation. Ensure external V
DD
load will shunt current greater than maximum injection
current. This will be the greatest risk when the MCU is not consuming power. Examples are: if
no system clock is present, or if the clock rate is very low which would reduce overall power
consumption.
MC9S08AC128 Series Data Sheet, Rev. 2
12
Freescale Semiconductor
FREESCALE [ FREESCALE SEMICONDUCTOR, INC ]
