Datasheet

DS5792 Rev 13 105/143
STM32F103xC, STM32F103xD, STM32F103xE Electrical characteristics
135
Figure 56. USB timings: definition of data signal rise and fall time
Table 57. USB DC electrical characteristics
Symbol Parameter Conditions Min.
(1)
1. All the voltages are measured from the local ground potential.
Max.
(1)
Unit
Input levels
V
DD
USB operating voltage
(2)
2. To be compliant with the USB 2.0 full-speed electrical specification, the USB_DP (D+) pin should be pulled
up with a 1.5 kΩ resistor to a 3.0-to-3.6 V voltage range.
-3.0
(3)
3. The STM32F103xC/D/E USB functionality is ensured down to 2.7 V but not the full USB electrical
characteristics which are degraded in the 2.7-to-3.0 V V
DD
voltage range.
3.6 V
V
DI
(4)
4. Guaranteed by characterization results.
Differential input sensitivity I(USB_DP, USB_DM) 0.2 -
VV
CM
(4)
Differential common mode range Includes V
DI
range 0.8 2.5
V
SE
(4)
Single ended receiver threshold - 1.3 2.0
Output levels
V
OL
Static output level low R
L
of 1.5 kΩ to 3.6 V
(5)
5.
R
L
is the load connected on the USB drivers
-0.3
V
V
OH
Static output level high R
L
of 15 kΩ to V
SS
(5)
2.8 3.6
Table 58. USB: full-speed electrical characteristics
Driver characteristics
(1)
1. Guaranteed by design.
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
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