Datasheet

MCF51AC256 ColdFire Microcontroller Data Sheet, Rev.7
Electrical Characteristics
Freescale Semiconductor22
Figure 5. Typical I
OH
vs. V
DD
–V
OH
at V
DD
= 3 V (Low Drive, PTxDSn = 0)
22 D
DC injection current
5 6 7 8
(single pin limit)
V
IN
>V
DD
V
IN
<V
SS
I
IC
0
0
—
2
–0.2
mA
DC injection current (Total MCU limit, includes sum of all
stressed pins)
V
IN
>V
DD
V
IN
<V
SS
0
0
—25
–5
mA
1
Typical values are based on characterization data at 25C unless otherwise stated.
2
Measured with V
In
= V
DD
or V
SS
.
3
Measured with V
In
= V
SS
.
4
Measured with V
In
= V
DD
.
5
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 clock rate is very low (which would reduce overall power consumption).
6
All functional non-supply pins are internally clamped to V
SS
and V
DD
.
7
Input must be current limited to the value specified. To determine the value of the required current-limiting resistor, calculate
resistance values for positive and negative clamp voltages, then use the larger of the two values.
8
The RESET pin does not have a clamp diode to V
DD
. Do not drive this pin above V
DD
.
Table 10. DC Characteristics (continued)
Num C Parameter Symbol Min Typical
1
Max Unit
–5.0E-3
–4.0E-3
–3.0E-3
–2.0E-3
–1.0E-3
000E+0
0 0.3 0.5 0.8 0.9 1.2 1.5
V
DD
–V
OH
(V)
V
Supply
–V
OH
Average of I
OH
I
OH
(A)
25C
–6.0E-3
105C
-40C