USB3250 Standard Microsystems Corporation, USB3250 Datasheet - Page 19

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

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