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FSUSB31L8X Datasheet(PDF) 10 Page - Fairchild Semiconductor

Part # FSUSB31L8X
Description  Low-Power 1-Port Hi-Speed USB 2.0 (480Mbps) Switch
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FSUSB31L8X Datasheet(HTML) 10 Page - Fairchild Semiconductor

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© 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSUSB31 Rev. 1.0.6
10
Application Guidance: Meeting USB 2.0 Vbus Short Requirements
In section 7.1.1 of the USB 2.0 specification, it notes that
USB devices must be able to withstand a Vbus short to
D+ or D- when the USB devices is either powered off or
powered on. The FSUSB31 can be successfully config-
ured to meet both these requirements.
Power-Off Protection
For a Vbus short circuit, the switch is expected to with-
stand such a condition for at least 24 hours. The
FSUSB31 has specially designed circuitry which pre-
vents unintended signal bleed through as well as guar-
anteed system reliability during a power-down, over-
voltage condition. The protection has been added to the
common pins (D+, D-).
Power-On Protection
The USB 2.0 specification also notes that the USB
device should be capable of withstanding a Vbus short
during transmission of data. Fairchild recommends add-
ing a 100
Ω series resister between the switch VCC pin
and supply rail to protect against this case. This modifi-
cation works by limiting current flow back into the VCC
rail during the over-voltage event so current remains
within the safe operating range. In this application, the
switch passes the full 5.25V input signal through to the
selected output, while maintaining specified off isolation
on the un-selected pins.
D+ = 5.25V
VCC= 3.6 V
100 Ohms
FSUSB31
D- = 5.25V
HSD+
HSD-
Figure 20. A 100
Ω resistor in series with the VCC supply allows the FSUSB31 to withstand a Vbus
short when powered up
For more information, see Applications Note AN-6022 Using the FSUSB30/FSUSB31 to Comply with
USB 2.0 Fault Condition Requirements at www.fairchildsemi.com


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