TUSB1310A
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SLLSE32D–NOVEMBER 2010–REVISED MAY 2011
90.9 kW ±±1
±0 kW ±±1
Figure 5-2. USB Standard-A Connector Pin Connection
90.9 kW ±±1
±0 kW ±±1
Figure 5-3. USB Standard-B Connector Pin Connection
5.1.2 Clock Connections
The TUSB1310A supports an external oscillator source or a crystal unit. If a clock is provided to XI instead
of a crystal, XO is left open. Otherwise, if a crystal is used, the connection needs to follow the guidelines
below.
Since XI and XO are coupled to other leads and supplies on the PCB, it is important to keep them as short
as possible and away from any switching leads. It is also recommended to minimize the capacitance
between XI and XO. This can be accomplished by connecting the VSSOSC lead to the two external
capacitors CL1 and CL2 and shielding them with the clean ground lines. The VSSOSC should not be
connected to PCB ground.
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DESIGN GUIDELINES
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