STM32F446ME datasheet(139/201 Pages) STMICROELECTRONICS

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STM32F446xC/E

Electrical characteristics

174

USB high speed (HS) characteristics

Unless otherwise specified, the parameters given in Table 73 for ULPI are derived from

tests performed under the ambient temperature, fHCLK frequency summarized in Table 72

and VDD supply voltage conditions summarized in Table 71, with the following configuration:

•

Output speed is set to OSPEEDRy[1:0] = 10, unless otherwise specified

•

Capacitive load C = 30 pF, unless otherwise specified

•

Measurement points are done at CMOS levels: 0.5VDD.

Refer to Section 6.3.17: I/O port characteristics for more details on the input/output

characteristics.

Table 70. USB OTG full speed electrical characteristics(1)

1. Guaranteed by design.

Driver characteristics

Symbol

Parameter

Conditions

Min

Max

Unit

Rise time(2)

2. Measured from 10% to 90% of the data signal. For more detailed informations, please refer to USB

Specification - Chapter 7 (version 2.0).

CL = 50 pF

420

Fall time(2)

CL = 50 pF

trfm

Rise/ fall time matching

tr/tf

110

VCRS

Output signal crossover voltage

1.3

2.0

ZDRV

Output driver impedance(3)

3. No external termination series resistors are required on DP (D+) and DM (D-) pins since the matching

impedance is included in the embedded driver.

Driving high or

low

Table 71. USB HS DC electrical characteristics

Symbol

Parameter

Min.(1)

1. All the voltages are measured from the local ground potential.

Max.(1)

Unit

Input level

VDD

USB OTG HS operating voltage

1.7

3.6

Table 72. USB HS clock timing parameters(1)

Symbol

Parameter

Min

Typ

Max

Unit

fHCLK value to guarantee proper operation of

USB HS interface

MHz

FSTART_8BIT

Frequency (first transition)

8-bit ±10%

MHz

FSTEADY

Frequency (steady state) ±500 ppm

59.97

60.03

MHz

DSTART_8BIT

Duty cycle (first transition)

8-bit ±10%

DSTEADY

Duty cycle (steady state) ±500 ppm

49.975

50.025

tSTEADY

Time to reach the steady state frequency and

duty cycle after the first transition

1.4

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