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| silicon protection arrays ?2009 littelfuse, inc 5 application guide usb1.1 considerations: each port operates at either 1.5mbps or 12mbps (low and full speed respectively) slower speeds can tolerate higher capacitance devices requires 2 channels of data line protection per port (i.e. d+/d- ) a 4 channel device can be useful if protecti ng a usb stack of 2 ports to make the esd footprint as small as possible v bus can be protected separately with a single channel device (0402 shown) application schematic: recommended spa devices: ordering number esd level (contact) i/o capacitance # of channels v rwm packaging sp0502bajtg 20kv 30pf 2 5.5v sc70-3 sp1001-02xtg 8kv 12pf 2 5.5v sot553 sp1001-04xtg 8kv 12pf 4 5.5v sot553 SP1003-01DTG 25kv 30pf 1 5.0v sod723 signal gnd case gnd usb controller usb port sp05 outside world case gnd sp1003 v bus d+ d- ic
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