Datasheet

DocID024030 Rev 10 137/239
STM32F427xx STM32F429xx Electrical characteristics
198
Figure 35. FT 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
) except PC13, PC14, PC15 and PI8 which
can sink or source up to ±3mA. When using the PC13 to PC15 and PI8 GPIOs 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 6.2. In particular:
• 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
ΣI
VDD
(see Table 15).
• 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
ΣI
VSS
(see Table 15).
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