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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
t
r
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).
C
L
= 50 pF 420ns
t
f
Fall time
(2)
C
L
= 50 pF 4 20 ns
t
rfm
Rise/ fall time matching t
r
/t
f
90 110 %
V
CRS
Output signal crossover voltage 1.3 2.0 V
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 V
DD
USB OTG HS operating voltage 2.7 3.6 V
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% F
START_8BIT
54 60 66 MHz
Frequency (steady state) ±500 ppm F
STEADY
59.97 60 60.03 MHz
Duty cycle (first transition) 8-bit ±10% D
START_8BIT
40 50 60 %
Duty cycle (steady state) ±500 ppm D
STEADY
49.975 50 50.025 %
Time to reach the steady state frequency and
duty cycle after the first transition
T
STEADY
--1.4ms
Clock startup time after the
de-assertion of SuspendM
Peripheral T
START_DEV
--5.6
ms
Host T
START_HOST
---
PHY preparation time after the first transition
of the input clock
T
PREP
---µs
ai14137
t
f
Differen tial
Data L ines
V
SS
V
CR S
t
r
Crossover
points