8 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

8.1 Application Information

There are many USB applications in which the USB hubs or controllers have a limited number of USB I/Os. The

TS3USB30E solution can effectively expand the limited USB I/Os by switching between multiple USB buses to a

single USB hub or controller. The TS3USB30E can also be used to connect a single USB controller to two USB

connectors or controllers.

8.2 Typical Application

USB

Connector

SetTopBox

(STB)CPU

orDSP

Processor

USB2.0

Controller

DVRor

MassStorage

Controller

TS3USB30E

Control

1D+

1D–

V

CC

2D+

2D–

D+

D–

S

OE

Figure 8-1. Application Diagram

8.2.1 Design Requirements

Design requirements of the USB 1.0, 1.1, and 2.0 standards should be followed. TI recommends that the digital

control pins S and OE be pulled up to VCC or down to GND to avoid undesired switch positions that could result

from the floating pin.

8.2.2 Detailed Design Procedure

The TS3USB30E can be properly operated without any external components. However, TI recommends to

connect any unused pins to ground through a 50Ω resistor to prevent signal reflections back into the device.

www.ti.com

TS3USB30E

SCDS255G – DECEMBER 2008 – REVISED OCTOBER 2024

Copyright © 2024 Texas Instruments Incorporated

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Product Folder Links: TS3USB30E