Datasheet

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STM32F103xF, STM32F103xG Electrical characteristics
132
Figure 43. 5 V tolerant I/O input characteristics - TTL port
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
) except PC13, PC14 and PC15 which can
sink or source up to ±3 mA. When using the GPIOs PC13 to PC15 in output mode, the
speed should not exceed 2 MHz with a maximum load of 30 pF.
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 5.2:
• The sum of the currents sourced by all the I/Os on V
DD,
plus the maximum Run
consumption of the MCU sourced on V
DD,
cannot exceed the absolute maximum rating
I
VDD
(see Table 8).
• The sum of the currents sunk by all the I/Os on V
SS
plus the maximum Run
consumption of the MCU sunk on V
SS
cannot exceed the absolute maximum rating
I
VSS
(see Table 8).
Output voltage levels
Unless otherwise specified, the parameters given in Table 50 are derived from tests
performed under ambient temperature and V
DD
supply voltage conditions summarized in
Table 10. All I/Os are CMOS and TTL compliant.
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Table 50. Output voltage characteristics
Symbol Parameter Conditions Min Max Unit
V
OL
(1)
Output low level voltage for an I/O pin
when 8 pins are sunk at same time
TTL port
(3)
I
IO
= +8 mA
2.7 V < V
DD
< 3.6 V
-0.4
V
V
OH
(2)
Output high level voltage for an I/O pin
when 8 pins are sourced at same time
V
DD
–0.4 -
V
OL
(1)
Output low level voltage for an I/O pin
when 8 pins are sunk at same time
CMOS port
(3)
I
IO
=+ 8mA
2.7 V < V
DD
< 3.6 V
-0.4
V
V
OH
(2)
Output high level voltage for an I/O pin
when 8 pins are sourced at same time
2.4 -
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