STM32F217VG datasheet(103/175 Pages) STMICROELECTRONICS

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Electrical characteristics

174

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

±3mA. When using the PC13 to PC15 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:

•

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 11).

•

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 11).

Output voltage levels

Unless otherwise specified, the parameters given in Table 46 are derived from tests

performed under ambient temperature and VDD supply voltage conditions summarized in

Table 13. All I/Os are CMOS and TTL compliant.

Table 46. Output voltage characteristics(1)

1. PC13, PC14, PC15 and PI8 are supplied through the power switch. Since the switch only sinks a limited

amount of current (3 mA), the use of GPIOs PC13 to PC15 and PI8 in output mode is limited: the speed

should not exceed 2 MHz with a maximum load of 30 pF and these I/Os must not be used as a current

source (e.g. to drive an LED).

Symbol

Parameter

Conditions

Min

Max

Unit

VOL(2)

2. The IIO current sunk by the device must always respect the absolute maximum rating specified in Table 11

and the sum of IIO (I/O ports and control pins) must not exceed IVSS.

Output low level voltage for an I/O pin

when 8 pins are sunk at same time

CMOS ports

IIO = +8 mA

2.7 V < VDD < 3.6 V

-0.4

VOH(3)

3. The IIO current sourced by the device must always respect the absolute maximum rating specified in

Table 11 and the sum of IIO (I/O ports and control pins) must not exceed IVDD.

Output high level voltage for an I/O pin

when 8 pins are sourced at same time

VDD–0.4

VOL (2)

Output low level voltage for an I/O pin

when 8 pins are sunk at same time

TTL ports

IIO =+ 8mA

2.7 V < VDD < 3.6 V

-0.4

VOH (3)

Output high level voltage for an I/O pin

when 8 pins are sourced at same time

2.4

VOL(2)(4)

4. Based on characterization data, not tested in production.

Output low level voltage for an I/O pin

when 8 pins are sunk at same time

IIO = +20 mA

2.7 V < VDD < 3.6 V

-1.3

VOH(3)(4)

Output high level voltage for an I/O pin

when 8 pins are sourced at same time

VDD–1.3

VOL(2)(4)

Output low level voltage for an I/O pin

when 8 pins are sunk at same time

IIO = +6 mA

2 V < VDD < 2.7 V

-0.4

VOH(3)(4)

Output high level voltage for an I/O pin

when 8 pins are sourced at same time

VDD–0.4

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