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USBUF01W6 Datasheet(PDF) 8 Page - STMicroelectronics

Part # USBUF01W6
Description  EMI filter and line termination for USB upstream ports
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

USBUF01W6 Datasheet(HTML) 8 Page - STMicroelectronics

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Technical information
USBUFxxW6
8/11
2.6
Transition times
This low pass filter has been designed in order to meet the USB 1.1 standard requirements
that implies the signal edges are maintained within the 4 -20 ns stipulated USB specification
limits. To verify this point, we have measured the rise time of VD+ voltage with and without
the USBUFxxW6 device.
Figure 14. shows the circuit used to perform measurements of the transition times. In Figure
15., we see the results of such measurements:
trise = 3.8 ns driver alone
trise = 7.8 ns with protection device
The adding of the protection device causes the rise time increase of roughly 4ns.
Note:
Rise time has been measured between 10% and 90% of the signal (resp. 90% and 10%)
Figure 14.
Typical rise and fall times:
measurement configuration
Figure 15.
Typical rise times with and
without protection device
D+
D-
+5V
+5V
74HC04
+5V
Square
Pulse
Generator
74HC04
USBDF
01W6
without
with


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