MC9S08RC8 Datasheet, PDF (209/234 Pages) Freescale Semiconductor, Inc – Microcontrollers

Electrical Characteristics
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. 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).
9. PTA0 does not have a clamp diode to V_DD. Do not drive PTA0 above V_DD.
40
PULLUP RESISTOR TYPICALS
85°C
40
25°C
PULLDOWN RESISTOR TYPICALS
85°C
–40°C
25°C
35
–40°C
35
30
30
25
25
20
1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6
V_DD (V)
20
1.8
2.3
2.8
V_DD (V)
Figure A-1. Pullup and Pulldown Typical Resistor Values (V_DD = 3.0 V)
3.3 3.6
1
0.8
0.6
0.4
0.2
0
0
85°C
25°C
–40°C
TYPICAL V_OL VS I_OL AT V_DD = 3.0 V
TYPICAL V_OL VS V_DD
0.4
85°C
25°C
0.3
–40°C
10
20
I_OL (mA)
0.2
0.1
0
30
1
I_OL = 6 mA
I_OL = 3 mA
2
3
V_DD (V)
Figure A-2. Typical Low-Side Driver (Sink) Characteristics (Port B and IRO)
I_OL = 10 mA
4
TYPICAL V_OL VS I_OL AT V_DD = 3.0 V
1.2
85°C
1
25°C
–40°C
0.8
TYPICAL V_OL VS V_DD
0.2
0.15
0.6
0.1
0.4
0.2
0.05
85°C,
25°C,
II_OOLL
=
=
2
2
mA
mA
–40°C, I_OL = 2 mA
0
0
0
5
10
15
20
I_OL (mA)
1
2
3
4
V_DD (V)
Figure A-3. Typical Low-Side Driver (Sink) Characteristics (Ports A, C, D and E)
MC9S08RC/RD/RE/RG Data Sheet, Rev. 1.11
Freescale Semiconductor
209