TS3USB221

2-channel

SPDT

VCC

S

OE

D+

D-

GND

System

Controller

USB Port 1

USB Port 2

0.1 F

0.1 F

3.3 V

USB

Controller

Switch

Control Logic

2D+

2D-

1D+

1D-

TS3USB221

www.ti.com

SCDS220I – NOVEMBER 2006 – REVISED JANUARY 2016

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

TS3USB221 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.

9.2 Typical Application

Figure 15. Simplified Schematic

9.2.1 Design Requirements

Design requirements of the USB 1.0, 1.1, and 2.0 standards should be followed.

switch positions that could result from the floating pin.

9.2.2 Detailed Design Procedure

The TS3USB221 may be properly operated without any external components. However, it is recommended that

unused pins be connected to ground through a 50-

Ω resistor to prevent signal reflections back into the device.

Copyright © 2006–2016, Texas Instruments Incorporated

Submit Documentation Feedback

13

Product Folder Links: TS3USB221