STM32U073RCT6 datasheet(109/146 Pages) STMICROELECTRONICS

109 / 146 page

Figure 33. SPI timing diagram - master mode

th(MI)

tc(SCK)

tw(SCKH)

tw(SCKL)

tsu(MI)

NSS input

CPHA=0

CPOL=0

CPHA=0

CPOL=1

MOSI output

MISO input

First bit OUT

Last bit OUT

Next bits OUT

First bit IN

Last bit IN

Next bits IN

CPHA=1

CPOL=0

CPHA=1

CPOL=1

High

tv(MO)

th(MO)

1. Measurement points are done at CMOS levels: 0.3 VDD and 0.7 VDD.

6.3.30

USB characteristics

The USB interface is fully compliant with the USB specification version 2.0 and is USB-IF certified (for Full-speed

device operation).

Table 88. USB electrical characteristics

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

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VDDUSB

USB transceiver operating voltage

3.0(1)

3.6

Tcrystall_less

USB crystal-less operation temperature

-15

°C

tSTARTUP(2)

USB transceiver startup time

1.0

μs

RPUI

Embedded USB_DP pull-up value during idle

900

1250

1600

Ω

RPUR

Embedded USB_DP pull-up value during reception

1400

2300

3200

ZDRV(2)

Output driver impedance(3)

High and low driver

1. USB functionality is ensured down to 2.7 V, but some USB electrical characteristics are degraded in 2.7 to 3.0 V range.

2. Specified by design, not tested in production.

3. No external termination series resistors are required on USB_DP (D+) and USB_DM (D-). The matching impedance is already included in

the embedded driver.

STM32U073x8/B/C

Electrical characteristics

DS14548 - Rev 2

page 109/146

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