32G474 datasheet(181/236 Pages) STMICROELECTRONICS

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DS12288 Rev 4

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STM32G474xB STM32G474xC STM32G474xE

Electrical characteristics

201

USB characteristics

The device USB interface is fully compliant with the USB specification version 2.0 and is

USB-IF certified (for Full-speed device operation).

USART interface characteristics

Unless otherwise specified, the parameters given in Table 93 for USART are derived from

tests performed under the ambient temperature, fPCLKx frequency and VDD supply voltage

conditions summarized in Table 93, with the following configuration:

•

Output speed is set to OSPEEDRy[1:0] = 10

•

Capacitive load C=30 pF

•

Measurement points are done at CMOS levels: 0.5 VDD

Refer to Section 5.3.14: I/O port characteristics for more details on the input/output alternate

function characteristics (NSS, CK, TX, RX for USART).

Table 92. USB electrical characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VDD

USB transceiver operating voltage

3.0(2)

-3.6

tCrystal_less USB crystal less operation temperature

-15

°C

RPUI

Embedded USB_DP pull-up value during idle

900

1250

1500

Ω

RPUR

Embedded USB_PD pull-up value during reception

1400

2300

3200

ZsDRV(3)

Output driver impedance(4)

Driving high and low

Ω

1. TA = -40 to 125 °C unless otherwise specified.

2. The device USB functionality is ensured down to 2.7 V but not the full USB electrical characteristics, which are degraded in

the 2.7-to-3.0 V voltage range.

3. Guarantee by design.

4. No external termination series resistors are required on USB_PD (D+) and USB_DM (D-); the matching impedance is

already included in the embedded driver.

Table 93. USART electrical characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fCK

USART clock frequency

Master mode

MHz

Slave mode

tsu(NSS)

NSS setup time

Slave mode

tker + 2

th(NSS)

NSS hold time

Slave mode

tw(CKH)

tw(CKL)

CK high and low time

Master mode

1/fck/2-1

1/fck/2

1/fck/2+1 ns

tsu(RX)

Data input setup time

Master mode

tker + 2

Slave mode

th(RX)

Data input hold time

Master mode

Slave mode

0.5

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