USB3250 Standard Microsystems Corporation, USB3250 Datasheet - Page 18

• Manufacturer Part Number: USB3250
• Description: Usb2.0 PHY IC
• Manufacturer: Standard Microsystems Corporation

Revision 1.5 (03-24-06)
6.1
-10.71 * |V
Figure 6.1 Full-Speed Driver VOH/IOH Characteristics for High-speed Capable Transceiver
-6.1 * |V
Capable Transceivers
The USB transceiver uses a differential output driver to drive the USB data signal onto the USB cable.
Figure 6.1
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.
Driver Characteristics of Full-Speed Drivers in High-Speed
I
(mA)
out
OH
OH
0
|
|
0
shows the V/I characteristics for a full-speed driver which is part of a high-speed capable
Drive High
V
out
Test Limit
(Volts)
Slope = 1/49.5 Ohm
DATASHEET
18
0.566*V
OH
0.698*V
Slope = 1/40.5 Ohm
OH
SMSC GT3200, SMSC USB3250
V
USB2.0 PHY IC
OH
Datasheet