
Electrical characteristics ST72321xx-Auto
204/243 Doc ID 13829 Rev 1
19.8.2 Output driving current
Subject to general operating conditions for V
DD
, f
CPU
, and T
A
unless otherwise specified.
Figure 82. Unused I/O pins configured as
input
Figure 83. Typical I
PU
vs V
DD
with V
IN
=V
SS
10k
ST7XXX
10k
UNUSED I/O PORT
ST7XXX
V
DD
Note: I/O can be left unconnected if it is configured as output
greater EMC robustness and lower cost.
(0 or 1) by the software. This has the advantage of
UNUSED I/O PORT
0
10
20
30
40
50
60
70
80
90
2 2.5 3 3.5 4 4.5 5 5.5 6
Vdd(V)
Ipu(uA)
Ta=140°C
Ta=95°C
Ta=25°C
Ta=-45°C
Table 127. Output driving current
Symbol Parameter Conditions Min Max Unit
V
OL
(1)
Output low level voltage for a standard I/O pin
when 8 pins are sunk at same time
(see Figure 84)
V
DD
=5V
I
IO
=+5mA 1.2
V
I
IO
=+2mA 0.5
Output low level voltage for a high sink I/O pin
when 4 pins are sunk at same time
(see Figure 85 and Figure 87)
I
IO
= +20mA,
T
A
< 85°C
T
A
> 85°C
1.3
1.5
I
IO
=+8mA 0.6
V
OH
(2)
Output high level voltage for an I/O pin
when 4 pins are sourced at same time
(see Figure 86 and Figure 89)
I
IO
=-5mA,
T
A
< 85°C
T
A
> 85°C
V
DD
-1.4
V
DD
-1.6
I
IO
=-2mA V
DD
-0.7
1. The I
IO
current sunk must always respect the absolute maximum rating specified in Section 19.2.2 and the sum of I
IO
(I/O
ports and control pins) must not exceed I
VSS
.
2. The I
IO
current sourced must always respect the absolute maximum rating specified in Section 19.2.2 and the sum of I
IO
(I/O ports and control pins) must not exceed I
VDD
. True open-drain I/O pins do not have V
OH
.
Komentáře k této Příručce