STM32F042C4 datasheet(75/117 Pages) STMICROELECTRONICS

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STM32F042x4 STM32F042x6

Electrical 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 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 VDDIOx, plus the maximum

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

IVDD (see Table 18: Voltage characteristics).

•

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

the MCU sunk on VSS, cannot exceed the absolute maximum rating ΣIVSS (see

Table 18: Voltage characteristics

Output voltage levels

Unless otherwise specified, the parameters given in the table below are derived from tests

performed under the ambient temperature and supply voltage conditions summarized in

Table 21: General operating conditions

. All I/Os are CMOS- and TTL-compliant (FT, TTa or

TC unless otherwise specified).

Table 51. Output voltage characteristics(1)

Symbol

Parameter

Conditions

Min

Max

Unit

VOL

Output low level voltage for an I/O pin

CMOS port(2)

|IIO| = 8 mA

VDDIOx ≥ 2.7 V

-0.4

VOH

Output high level voltage for an I/O pin

VDDIOx–0.4

VOL

Output low level voltage for an I/O pin

TTL port(2)

|IIO| = 8 mA

VDDIOx ≥ 2.7 V

-0.4

VOH

Output high level voltage for an I/O pin

2.4

VOL(3)

Output low level voltage for an I/O pin

|IIO| = 20 mA

VDDIOx ≥ 2.7 V

-1.3

VOH(3)

Output high level voltage for an I/O pin

VDDIOx–1.3

VOL(3)

Output low level voltage for an I/O pin

|IIO| = 6 mA

VDDIOx ≥ 2 V

-0.4

VOH(3)

Output high level voltage for an I/O pin

VDDIOx–0.4

VOL(4)

Output low level voltage for an I/O pin

|IIO| = 4 mA

-0.4

VOH(4)

Output high level voltage for an I/O pin

VDDIOx–0.4

VOLFm+(3)

Output low level voltage for an FTf I/O pin in

Fm+ mode

|IIO| = 20 mA

VDDIOx ≥ 2.7 V

-0.4

|IIO| = 10 mA

0.4

1. The IIO current sourced or sunk by the device must always respect the absolute maximum rating specified in Table 18:

Voltage characteristics

, and the sum of the currents sourced or sunk by all the I/Os (I/O ports and control pins) must always

respect the absolute maximum ratings

IIO.

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

3. Data based on characterization results. Not tested in production.

4. Data based on characterization results. Not tested in production.

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