Electrical characteristics
Table 43.
Symbol
Input levels
V
DD
V
DI(4)
V
CM(4)
V
SE(4)
USB operating voltage
(2)
Differential input sensitivity
Differential common mode range
Single ended receiver threshold
STM32F103x8, STM32F103xB
USB DC electrical characteristics
Parameter
Conditions
Min.
(1)
Max.
(1)
Unit
3.0
(3)
I(USBDP, USBDM)
Includes V
DI
range
0.2
0.8
1.3
3.6
V
2.5
2.0
V
Output levels
V
OL
V
OH
Static output level low
Static output level high
R
L
of 1.5 k
to 3.6 V
(5)
R
L
of 15 k
to V
SS(5)
2.8
0.3
V
3.6
1. All the voltages are measured from the local ground potential.
2. To be compliant with the USB 2.0 full-speed electrical specification, the USBDP (D+) pin should be pulled
up with a 1.5 k resistor to a 3.0-to-3.6 V voltage range.
3. The STM32F103xx 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.
4. Guaranteed by design, not tested in production.
5. R
L
is the load connected on the USB drivers
Figure 35. USB timings: definition of data signal rise and fall time
Crossover
points
Differen tial
data lines
V
CRS
VS S
tf
tr
ai14137
Table 44.
Symbol
USB: Full-speed electrical characteristics
(1)
Parameter
Conditions
Min
Max
Unit
Driver characteristics
t
r
t
f
t
rfm
V
CRS
Rise time
(2)
Fall time
(2)
Rise/ fall time matching
Output signal crossover voltage
C
L
= 50 pF
C
L
= 50 pF
t
r
/t
f
4
4
90
1.3
20
20
110
2.0
ns
ns
%
V
1. Guaranteed by design, not tested in production.
2. Measured from 10% to 90% of the data signal. For more detailed informations, please refer to USB
Specification - Chapter 7 (version 2.0).
5.3.16
CAN (controller area network) interface
Refer to
for more details on the input/output alternate
function characteristics (CAN_TX and CAN_RX).
70/96
Doc ID 13587 Rev 12
STMICROELECTRONICS [ STMICROELECTRONICS ]
