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USB3250 データシート(PDF) 18 Page - SMSC Corporation

部品番号 USB3250
部品情報  USB2.0 PHY IC
PDF  48 Pages
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メーカー  SMSC [SMSC Corporation]
ホームページ  http://www.smsc.com
Logo SMSC - SMSC Corporation

USB3250 データシート(HTML) 18 Page - SMSC Corporation

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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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