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| silicon protection arrays ?2009 littelfuse, inc 6 application guide usb2.0 considerations: each port can operate up to 480mbps the high data rate requires a low capacitance device to preserve signal integrity requires 2 channels of data line protection per port (i.e. d+/d- ) a 4 channel device can be useful if protecting a usb stack of 2 ports to make the esd footprint as small as possible v bus can be protected by connecting it to the v cc pin on the diode array or by using a separate single channel device as previously shown (i.e. sp1003) application schematic: recommended spa devices: ordering number esd level (contact) i/o capacitance # of channels v rwm packaging sp3003-02xtg 8kv 0.65pf 2 6v sot553 SP3004-04XTG 12kv 0.85pf 4 6v sot563 sp3002-04utg 12kv 0.85pf 4 6v dfn-6 (1.6x1.6mm) signal gnd case gnd usb controller usb port sp3003 outside world optional connection to v bus v bus d+ d- ic
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