STM32F427AI datasheet(152/240 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F427xx STM32F429xx

152/240

DS9405 Rev 12

Figure 45. USB OTG full speed timings: definition of data signal rise and fall time

USB high speed (HS) characteristics

Unless otherwise specified, the parameters given in Table 71 for ULPI are derived from

tests performed under the ambient temperature, fHCLK frequency summarized in Table 70

and VDD supply voltage conditions summarized in Table 69, 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 68.

USB OTG full speed electrical characteristics(1)

1. Specified 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 information, 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

Ω

Table 69. 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

ai14137b

Cross over

points

Differential

data lines

VCRS

VSS

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