STM32F103XC datasheet(91/143 Pages) STMICROELECTRONICS

91 / 143 page

DS5792 Rev 13

91/143

STM32F103xC, STM32F103xD, STM32F103xE

Electrical characteristics

135

Figure 45. 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 VOL/VOH) 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 VDD, plus the maximum Run

consumption of the MCU sourced on VDD, cannot exceed the absolute maximum rating

IVDD (see Table 8).

•

The sum of the currents sunk by all the I/Os on VSS plus the maximum Run

consumption of the MCU sunk on VSS cannot exceed the absolute maximum rating

IVSS (see Table 8).

Output voltage levels

Unless otherwise specified, the parameters given in Table 47 are derived from tests

performed under ambient temperature and VDD supply voltage conditions summarized in

Table 10. All I/Os are CMOS and TTL compliant.

Table 47. Output voltage characteristics

Symbol

Parameter

Conditions

Min

Max

Unit

VOL(1)

Output low level voltage for an I/O pin

when 8 pins are sunk at same time

TTL port(3)

IIO = +8 mA

2.7 V < VDD < 3.6 V

-0.4

VOH(2)

Output high level voltage for an I/O pin

when 8 pins are sourced at same time

VDD–0.4

VOL (1)

Output low level voltage for an I/O pin

when 8 pins are sunk at same time

CMOS port(3)

IIO =+ 8mA

2.7 V < VDD < 3.6 V

-0.4

VOH (2)

Output high level voltage for an I/O pin

when 8 pins are sourced at same time

2.4

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