STM32L412R8T6TR datasheet(164/192 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32L412xx

164/192

DS12469 Rev 8

Figure 36. Quad SPI timing diagram - SDR mode

Figure 37. Quad SPI timing diagram - DDR mode

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).

MSv36878V1

Data output

Clock

Data input

t(CK)

tw(CKH)

tw(CKL)

tr(CK)

tf(CK)

ts(IN)

th(IN)

tv(OUT)

th(OUT)

MSv36879V3

Data output

IO0

IO2

IO4

Clock

Data input

IO0

IO2

IO4

t(CLK)

tw(CLKH)

tw(CLKL)

tr(CLK)

tf(CLK)

tsf(IN) thf(IN)

tvf(OUT)

thr(OUT)

IO1

IO3

IO5

IO1

IO3

IO5

tvr(OUT)

thf(OUT)

tsr(IN) thr(IN)

Table 93. USB electrical characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VDDUSB

USB transceiver operating voltage

3.0(2)

-3.6

Tcrystal_less USB crystal less operation temperature

-15

tSTARTUP(3) 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(3)

Output driver impedance(4)

Driving high

and low

Ω

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

2. The STM32L412xx 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. Guaranteed by design.

4. 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.

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