AN2434 Freescale Semiconductor / Motorola, AN2434 Datasheet - Page 11

• Manufacturer Part Number: AN2434
• Description: Input/Output (I/O) Pin Drivers
• Manufacturer: Freescale Semiconductor / Motorola

The current that an output pin can sink is measured by connecting the output pin via a resistor to V
driving the output pin low (see
current through the resistor are measured using two digital multimeters. The values are recorded and
plotted in
Freescale Semiconductor
Figure 10
3.5
2.5
1.5
0.5
SPECIFIED I
3
2
1
0
0
and
OH
Figure
Figure 8. V
10
Figure
MC9S12DP256, 25°C, Port A0, V
12.
PORT A0
Input/Output (I/O) Pin Drivers, Rev. 0
OH
9). Again, the resistance is varied and the voltage at the pin and the
versus Source Current — Full Drive
Figure 9. Sink Circuit
20
V
OL
V
I
OH
(mA)
I
Sink
+25 mA INSTANTANEOUS MAXIMUM RECOMMENDED CURRENT
FOR DIGITAL OUTPUT PINS
30
R
+5 V = V
DD
40
DD
= 5 V
Source and Sink for Full-Drive Currents
0.8 V = V
50
DD
– V
OH
60
DD
and
11