STM32F205RB datasheet(117/178 Pages) STMICROELECTRONICS

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STM32F20xxx

Electrical characteristics

177

Figure 46. USB OTG FS timings: definition of data signal rise and fall time

USB HS characteristics

Table 59 shows the USB HS operating voltage.

Table 58. USB OTG FS electrical characteristics(1)

1. Guaranteed by design, not tested in production.

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

Table 59. 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

2.7

3.6

Table 60. Clock timing parameters

Parameter(1)

1. Guaranteed by design, not tested in production.

Symbol

Min

Nominal

Max

Unit

Frequency (first transition)

8-bit ±10%

FSTART_8BIT

MHz

Frequency (steady state) ±500 ppm

FSTEADY

59.97

60.03

MHz

Duty cycle (first transition)

8-bit ±10%

DSTART_8BIT

Duty cycle (steady state) ±500 ppm

DSTEADY

49.975

50.025

Time to reach the steady state frequency and

duty cycle after the first transition

TSTEADY

1.4

Clock startup time after the

de-assertion of SuspendM

Peripheral

TSTART_DEV

5.6

Host

TSTART_HOST

PHY preparation time after the first transition

of the input clock

TPREP

µs

ai14137

Differen tial

Data L ines

VSS

VCRS

Crossover

points

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