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USB3250 Datasheet(PDF) 19 Page - SMSC Corporation

Part # USB3250
Description  USB2.0 PHY IC
PDF  48 Pages
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Manufacturer  SMSC [SMSC Corporation]
Direct Link  http://www.smsc.com
Logo SMSC - SMSC Corporation

USB3250 Datasheet(HTML) 19 Page - SMSC Corporation

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USB2.0 PHY IC
Datasheet
SMSC GT3200, SMSC USB3250
19
Revision 1.5 (03-24-06)
DATASHEET
6.2
High-speed Signaling Eye Patterns
High-speed USB signals are characterized using eye patterns. For measuring the eye patterns 4
points have been defined (see Figure 6.3). The Universal Serial Bus Specification Rev.2.0 defines the
eye patterns in several 'templates'. The two templates that are relevant to the PHY are shown below.
Figure 6.2 Full-Speed Driver VOL/IOL Characteristics for High-speed Capable Transceiver
Vout (Volts)
VOH
0
0
Drive Low
Iout
(mA)
22
1.09V
0.434*VOH
Test Limit
Slope = 1/40.5 Ohm
Slope = 1/49.5 Ohm
10.71 * |VOH|



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