STM32F051K4 datasheet(72/104 Pages) STMICROELECTRONICS

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STM32F051x

Electrical characteristics

Doc ID 022265 Rev 3

73/105

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).

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 18).

●

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 18).

Output voltage levels

Unless otherwise specified, the parameters given in Table 51 are derived from tests

performed under ambient temperature and VDD supply voltage conditions summarized in

Table 20. All I/Os are CMOS and TTL compliant (FT, TTa or TC unless otherwise specified).

Table 51.

Output voltage characteristics

Symbol

Parameter

Conditions

Min

Max

Unit

VOL

(1)

The IIO current sunk by the device must always respect the absolute maximum rating specified in Table 18

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 port(2)

IIO = +8 mA

2.7 V < VDD < 3.6 V

TTL and CMOS outputs are compatible with JEDEC standards JESD36 and JESD52.

-0.4

VOH

(3)

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

Table 18 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

(1)

Output low level voltage for an I/O pin

when 8 pins are sunk at same time

TTL port(2)

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

(1)(4)

Data based on characterization results, not tested in production.

Output low level voltage for an I/O pin

when 5 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 5 pins are sourced at same time

VDD–1.3

VOL

(1)(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

VOLFM+

Output low level voltage for an FTf I/O

pin in FM+ mode

IIO = +20 mA

2.7 V < VDD < 3.6 V

-0.4

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