Datasheet

Appendix A Electrical Characteristics
MC9S08QD4 Series MCU Data Sheet, Rev. 6
178 Freescale Semiconductor
Figure A-1. Typical Low-Side Driver (Sink) Characteristics
Low Drive (PTxDSn = 0), V
DD
= 5.0V, V
OL
vs. I
OL
Figure A-2. Typical Low-Side Driver (Sink) Characteristics
Low Drive (PTxDSn = 0), V
DD
= 3.0 V, V
OL
vs. I
OL
7
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).
14
12
10
8
6
4
2
0
0
0.4
0.8 1.2
1.6
22.4
2.8
V
OL
/V
I
OL
/mA
–40
0
25
85
125
Typical Low-side Driver (LDS) Characteristics,
V
DD
= 5.0 V, PORTA
105
–40
25
85
105
–1.61.21
1.4
0.8
0.60.4
0.20
V
OL
/V
0
1
2
3
4
5
6
I
OL
/mA
Typical Low-side Driver (LDS) Characteristics,
V
DD
= 3.0 V, PORTA
0
125