Datasheet

STM32F405xx, STM32F407xx Electrical characteristics
Doc ID 022152 Rev 2 115/167
USB HS characteristics
Table 5 8 shows the USB HS operating voltage.
Figure 43. ULPI timing diagram
Table 58. 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
Ethernet operating voltage 2.7 3.6 V
Table 59. USB HS clock timing parameters
(1)
1. Guaranteed by design, not tested in production.
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
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
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