Datasheet

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STM32F405xx, STM32F407xx Electrical characteristics
Figure 44. USB OTG FS timings: definition of data signal rise and fall time
USB HS characteristics
Unless otherwise specified, the parameters given in Table 62 for ULPI are derived from
tests performed under the ambient temperature, f
HCLK
frequency summarized in Tabl e 61
and V
DD
supply voltage conditions summarized in Table 60, with the following configuration:
• Output speed is set to OSPEEDRy[1:0] = 10
• Capacitive load C = 30 pF
• Measurement points are done at CMOS levels: 0.5V
DD
.
Refer to Section Section 5.3.16: I/O port characteristics for more details on the input/output
characteristics.
Table 59. USB OTG FS electrical characteristics
(1)
1. Guaranteed by design.
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 60. 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 61. USB HS clock timing parameters
(1)
Parameter Symbol Min Nominal Max Unit
f
HCLK
value to guarantee proper operation of
USB HS interface
-30--MHz
Frequency (first transition) 8-bit ±10% F
START_8BIT
54 60 66 MHz
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