USB

Connector

SetTopBox

(STB)CPU

orDSP

Processor

USB2.0

Controller

DVRor

MassStorage

Controller

TS3USB30

Control

1D+

1D–

V

CC

2D+

2D–

D+

D–

S

OE

TS3USB30

www.ti.com

SCDS237F – AUGUST 2007 – REVISED AUGUST 2015

9 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. Customers should

validate and test their design implementation to confirm system functionality.

9.1 Application Information

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

TS3USB30 solution can effectively expand the limited USB I/Os by switching between multiple USB buses in

order to interface them to a single USB hub or controller. TS3USB221 can also be used to connect a single

controller to two USB connectors or controllers.

9.2 Typical Application

Figure 13. Application Diagram

9.2.1 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.

9.2.2 Detailed Design Procedure

The TS3USB30 can be properly operated without any external components. However, it is recommended that

unused pins should be connected to ground through a 50-

Ω resistor to prevent signal reflections back into the

device.

Copyright © 2007–2015, Texas Instruments Incorporated

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Product Folder Links: TS3USB30