USB3250 datasheet(18/48 Pages) SMSC

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USB3250 датащи(PDF) 18 Page - SMSC Corporation

18 / 48 page

USB2.0 PHY IC

Datasheet

Revision 1.5 (03-24-06)

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

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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