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FSUSB31L8X Datasheet(PDF) 10 Page - Fairchild Semiconductor |
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FSUSB31L8X Datasheet(HTML) 10 Page - Fairchild Semiconductor |
10 / 15 page © 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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