Datasheet

Electrical characteristics STM32F745xx STM32F746xx
164/227 DocID027590 Rev 4
Figure 53. 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 84 for ULPI are derived from
tests performed under the ambient temperature, f
HCLK
frequency summarized in Table 83
and V
DD
supply voltage conditions summarized in Table 82, with the following configuration:
• Output speed is set to OSPEEDRy[1:0] = 11, unless otherwise specified
• Capacitive load C = 20 pF, unless otherwise specified
• Measurement points are done at CMOS levels: 0.5V
DD
.
Refer to Section 5.3.17: I/O port characteristics for more details on the input/output
characteristics.
Table 81. USB OTG full speed 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
Z
DRV
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
28 44 Ω
Table 82. 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 1.7 3.6 V
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