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USB3250 Datasheet(PDF) 18 Page - SMSC Corporation |
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USB3250 Datasheet(HTML) 18 Page - SMSC Corporation |
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18 / 48 page  USB2.0 PHY IC Datasheet Revision 1.5 (03-24-06) 18 SMSC GT3200, SMSC USB3250 DATASHEET 6.1 Driver Characteristics of Full-Speed Drivers in High-Speed Capable Transceivers The USB transceiver uses a differential output driver to drive the USB data signal onto the USB cable. Figure 6.1 shows the V/I characteristics for a full-speed driver which is part of a high-speed capable transceiver. The normalized V/I curve for the driver must fall entirely inside the shaded region. The V/I region is bounded by the minimum driver impedance above (40.5 Ohm) and the maximum driver impedance below (49.5 Ohm). The output voltage must be within 10mV of ground when no current is flowing in or out of the pin. Figure 6.1 Full-Speed Driver VOH/IOH Characteristics for High-speed Capable Transceiver Vout (Volts) VOH 0 0 Drive High 0.698*VOH Test Limit Slope = 1/49.5 Ohm Slope = 1/40.5 Ohm 0.566*VOH -10.71 * |VOH| -6.1 * |VOH| Iout (mA) |
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