MC9S08QD4_08 Datasheet, PDF (180/202 Pages) Freescale Semiconductor, Inc – Microcontrollers

Appendix A Electrical Characteristics
7 _{Power supply must maintain regulation within operating VDD 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).
Typical Low-side Driver (LDS) Characteristics,
V_DD = 5.0 V, PORTA
14
12
125
10
105
85
8
25
6
0
4
–40
2
0
0
0.4
0.8
1.2
1.6
2
2.4 2.8
V_OL/V
Figure A-1. Typical Low-Side Driver (Sink) Characteristics
Low Drive (PTxDSn = 0), V_DD = 5.0V, V_OL vs. I_OL
Typical Low-side Driver (LDS) Characteristics,
V_DD = 3.0 V, PORTA
6
125
5
105
4
85
3
25
0
2
–40
1
0
0
0.2 0.4 0.6 0.8 1
1.2 1.4 –1.6
V_OL/V
Figure A-2. Typical Low-Side Driver (Sink) Characteristics
Low Drive (PTxDSn = 0), V_DD = 3.0 V, V_OL vs. I_OL
MC9S08QD4 Series MCU Data Sheet, Rev. 5
180
Freescale Semiconductor