STM32U073RCT3TR datasheet(84/146 Pages) STMICROELECTRONICS

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Figure 23. I/O input characteristics

Tested

in prod

uction

CMOS

requireme

nt Vi

h min

= 0.7xV

DDIOx

Based

on si

mulation

Vih min

= 0.61

xVDD

IOx+0.05

for 1.08<V

DDIOx

<1.62

or 0.49xV

DDIOx

+0.26

for V

DDIOx

>1.62

Based

on simulation

Vil max

=0.43

xVDDIOx

-0.1 for

1.08<V

DDIOx<1.62

or 0.39xV

DDIOx-0.06

for VDDIOx

>1.62

Tested in

production

CMOS requireme

nt Vil max

= 0.3xVdd

TTL requirement Vih min = 2V

TTL requirement Vil max = 0.8V

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).

GPIOs PC13, PC14 and PC15 are supplied through the power switch, limiting source capability up to 3 mA only.

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: Absolute maximum ratings:

•

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 ΣIVDD (see Table 19. 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 19. 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 Section 6.3.1: General operating conditions.

All I/Os are CMOS- and TTL-compliant (FT or TT unless otherwise specified).

Table 65. Output voltage characteristics

The IIO current sourced or sunk by the device must always respect the absolute maximum rating specified in Table 19. 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 ΣIIO.

Symbol

Parameter

Conditions

Min

Max Unit

VOL

Output low level voltage for an I/O pin

CMOS port (1)

|IIO| = 8 mA(2)

VDDIOx ≥ 2.7 V

0.4

VOH

Output high level voltage for an I/O pin

VDDIOx - 0.4

VOL(3)

Output low level voltage for an I/O pin

TTL port(1)

|IIO| = 8 mA(4)

VDDIOx ≥ 2.7 V

0.4

VOH(3) Output high level voltage for an I/O pin

2.4

STM32U073x8/B/C

Electrical characteristics

DS14548 - Rev 2

page 84/146

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