USBUF02W6 STMicroelectronics, USBUF02W6 Datasheet - Page 8

• Manufacturer Part Number: USBUF02W6
• Description: IC EMI FILTER/LINE TERM SOT323-6
• Manufacturer: STMicroelectronics
• Series: ASDr

Specifications of USBUF02W6

• Filter Type: Signal Line
• Mounting Type: Surface Mount
• Termination Style: Surface Mount (SMD,SMT)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Inductance: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-3743-2

Technical information
2.6
Note:
8/11
Figure 14. Typical rise and fall times:
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.
15., we see the results of such measurements:
The adding of the protection device causes the rise time increase of roughly 4ns.
Rise time has been measured between 10% and 90% of the signal (resp. 90% and 10%)
Square
Pulse
Generator
trise = 3.8 ns driver alone
trise = 7.8 ns with protection device
+5V
shows the circuit used to perform measurements of the transition times. In
measurement configuration
74HC04
+5V
D+
D-
USBDF
01W6
+5V
74HC04
Figure 15. Typical rise times with and
without
without protection device
with
USBUFxxW6
Figure