Datasheet

DS10198 Rev 8 171/270
STM32L476xx Electrical characteristics
238
All I/Os are CMOS- and TTL-compliant (no software configuration required). Their
characteristics cover more than the strict CMOS-technology or TTL parameters. The
coverage of these requirements is shown in
Figure 29 for standard I/Os, and in Figure 29 for
5 V tolerant I/Os.
Figure 29. I/O input characteristics
Output driving current
The GPIOs (general purpose input/outputs) can sink or source up to ±8 mA, and sink or
source up to ± 20
mA (with a relaxed V
OL
/V
OH
).
In the user application, the number of I/O pins which can drive current must be limited to
respect the absolute maximum rating specified in
Section 6.2:
• The sum of the currents sourced by all the I/Os on V
DDIOx,
plus the maximum
consumption of the MCU sourced on V
DD,
cannot exceed the absolute maximum rating
I
VDD
(see Table 20: Voltage characteristics).
• The sum of the currents sunk by all the I/Os on V
SS
, plus the maximum consumption of
the MCU sunk on V
SS
, cannot exceed the absolute maximum rating I
VSS
(see
Table 20: Voltage characteristics).
MSv37613V1
Tested in production CMOS requirement Vih min = 0.
7xV
D
DIO
x
Based on simulation Vih min = 0.
6
1xV
DDIOx
+0.05
for 1.08<V
D
DIOx
<1.62 or
0.49xV
DDIOx
+0.
2
6 fo
r V
DDI
Ox
>1.62
Based on simulation V
il m
ax
=0.43xV
DDIOx
-0.1 for 1.08<V
DDIOx
<1.62 or 0.39xV
DD
IOx
-0.0
6 for
V
DDIO
x
>1.62
Tested in production CMOS requirement Vil m
a
x = 0.3xVdd
TTL requirement Vih min = 2V
TTL requirement Vil max = 0.8V
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