512
Table 18-3 Permissible Output Currents
Conditions:
V
CC
= 3.0 V to 3.6 V, AV
CC
= 3.6 V to 5.5 V, V
SS
= AV
SS
= 0 V,
T
a
= –20
°
C to +75
°
C
Item
Symbol
Min
Typ
Max
Unit
Permissible output
Ports 1, 2, 5 and B
I
OL
—
—
10
mA
low current (per pin)
Other output pins
—
—
2.0
mA
Permissible output
low current (total)
Total of 27 pins including
ports 1, 2, 5 and B
Σ
I
OL
—
—
80
mA
Total of 23 pins, including
ports 8, 9, A and B
—
—
65
mA
Total of all output pins,
including the above
—
—
120
mA
Permissible output
high current (per pin)
All output pins
I
OH
—
—
2.0
mA
Permissible output
high current (total)
Total of all output pins
Σ
I
OH
—
—
40
mA
Note:
To protect chip reliability, do not exceed the output current values in table 18-3.
When driving a Darlington pair or LED, always insert a current-limiting resistor in the output
line, as shown in figures 18-1 and 18-2.