參數資料
型號： GT3200-JD
廠商： STANDARD MICROSYSTEMS CORP
元件分類： 網絡接口
英文描述： Aluminum Electrolytic Radial Leaded General Purpose Capacitor; Capacitance: 33uF; Voltage: 16V; Case Size: 5x11 mm; Packaging: Bulk
中文描述： DATACOM, INTERFACE CIRCUIT, PQFP64
封裝： 10 X 10 MM, 1.40 MM HEIGHT, 0.5 MM PITCH, TQFP-64
文件頁數： 18/51頁
文件大小： 1462K
代理商： GT3200-JD
USB2.0 PHY IC
Revision 1.3 (10-05-04)
13
SMSC GT3200, SMSC USB3250
DATASHEET
6.1
Capable Transceivers
Driver Characteristics of Full-Speed Drivers in High-Speed
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
V
out
(Volts)
V
OH
0
0
Drive High
0.698*V
OH
Test Limit
Slope = 1/49.5 Ohm
Slope = 1/40.5 Ohm
0.566*V
OH
-10.71 * |V
OH
|
-6.1 * |V
OH
|
I
out
(mA)
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