STM32U545NET3QTR datasheet(257/283 Pages) STMICROELECTRONICS

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DS14216 Rev 1

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STM32U545xx

Electrical characteristics

258

5.3.37

USB_FS characteristics

5.3.38

JTAG/SWD interface characteristics

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

performed under the ambient temperature, fHCLKx frequency and VDD supply voltage

conditions summarized in Table 33, with the following configuration:

•

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

•

Capacitive load CL = 30 pF

•

Measurement points done at 0.5 × VDD level

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

characteristics.

Table 131. USB_FS characteristics

Symbol

Parameter

Conditions

Min

Typ

Max Unit

VDDUSB

USB transceiver operating supply voltage

3.0(1)

-3.6

RPUI

Embedded USB_DP pullup value during idle

900

1575

Ω

RPUR

Embedded USB_DP pullup value during reception

1425

3090

ZDRV

Output driver impedance(2)

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. 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.

Table 132. JTAG characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

FTCK

TCK clock frequency

2.7 V ≤ VDD ≤ 3.6 V

MHz

1.71 V ≤ VDD ≤ 3.6 V

tisu(TMS)

TMS input setup time

tih(TMS)

TMS input hold time

tisu(TDI)

TDI input setup time

tih(TDI)

TDI input hold time

tov(TDO)

TDO output valid time

2.7 V ≤ VDD ≤ 3.6 V

1.71 V ≤ VDD ≤ 3.6 V

toh(TDO)

TDO output hold time

1. Evaluated by characterization. Not tested in production.

Table 133. SWD characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

FSWCLK

SWCLK clock frequency

2.7 V ≤ VDD ≤ 3.6 V

66.5

MHz

1.71 V ≤ VDD ≤ 3.6 V

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