Texas Instruments Switch TS3USB221 User Manual

User's Guide  
SCDU001AJuly 2009Revised October 2009  
TS3USB221/A/E High Speed USB 2.0 (480 Mbps) 1:2  
Multiplexer/Demultiplexer Switch Evaluation Module  
Contents  
1
2
3
4
Preface ....................................................................................................................... 2  
Introduction .................................................................................................................. 3  
EVM Configuration and Description ...................................................................................... 5  
Related Documentation ................................................................................................... 14  
List of Figures  
1
2
3
4
5
6
7
8
9
10  
TS3USB221/A/E EVM Block Diagram ...................................................................................  
Quick Start Evaluation......................................................................................................  
Jumpers J6, J7, and J8 Configuration ...................................................................................  
EVM Schematic .............................................................................................................  
Top Silkscreen/Assembly ..................................................................................................  
Top Metal (High-Speed Differential) .................................................................................... 10  
Internal Ground Plane .................................................................................................... 11  
Internal Power Plane...................................................................................................... 12  
Bottom Metal (Low-Speed Single-Ended).............................................................................. 13  
Bottom Silkscreen/Assembly............................................................................................. 13  
List of Tables  
1
2
3
4
EVM Jumper Description...................................................................................................  
EVM Connector Description ...............................................................................................  
Board Stack-Up .............................................................................................................  
Bill of Materials............................................................................................................. 14  
1
SCDU001AJuly 2009Revised October 2009  
TS3USB221/A/E High Speed USB 2.0 (480 Mbps) 1:2 Multiplexer/Demultiplexer  
Switch Evaluation Module  
Copyright © 2009, Texas Instruments Incorporated  
 
Introduction  
2
Introduction  
The TS3USB221/A/E EVM is an evaluation module for the Texas Instruments (TI) 1:2  
multiplexer/demultiplexer high-bandwidth USB switches. It is specially designed for high-speed USB 2.0  
signals, supports bidirectional signaling, and offers high-bandwidth (1.1 GHz). When interfacing other USB  
devices with this EVM, the switch allows signals to pass with minimum edge and phase distortion as well  
as little or no signal attenuation.  
This evaluation module is designed to demonstrate the small printed circuit board (PCB) areas that can be  
achieved when designing with the TS3USB221/A/E USB switches. It is powered from the 5-V rail of the  
USB input. Additionally, the TS3USB221/A/E provides an output enable input and an output select input  
for flexible configuration of the USB. See Figure 1 for the EVM block diagram.  
TS3USB221/A/E EVM  
TS3USB221/A/E  
Figure 1. TS3USB221/A/E EVM Block Diagram  
2.1 List of Hardware Items for Operation  
The following items are required for EVM evaluation:  
The TS3USB221/A/E EVM  
USB cables with connector type depending on the surrounding system  
The following items are optional for EVM evaluation:  
USB type A or type B connectors to change connectors J1 through J5 for optimal system interface  
configuration  
IBM compatible PC with USB 2.0 ports for quick start evaluation  
3
SCDU001AJuly 2009Revised October 2009  
TS3USB221/A/E High Speed USB 2.0 (480 Mbps) 1:2 Multiplexer/Demultiplexer  
Switch Evaluation Module  
Copyright © 2009, Texas Instruments Incorporated  
 
   
Introduction  
2.2 Quick Start  
TS3USB221/A/E EVM  
TS3USB221/A/E  
Figure 2. Quick Start Evaluation  
1. Connect the PC to the USB connector J3 through a USB cable.  
2. Make sure the 3.3-V LDO output is enabled by opening J8 without a jumper.  
3. Make sure the TS3USB221/A/E IC is enabled by shunting J7 with a jumper.  
4. Connect two USB downstream devices (for example, mouse, keyboard, USB memory stick, etc) to J4  
and J5 on the EVM.  
5. To select USB downstream device 1 connected to J4, make sure J6 is shunted with a jumper. To  
select USB downstream device 2 connected to J5, make sure J6 is open without a jumper.  
6. Connector J1 and J2 are connected together without a USB switch. This through-path can serve as a  
reference to compare with the TS3USB221/A/E path.  
4
TS3USB221/A/E High Speed USB 2.0 (480 Mbps) 1:2 Multiplexer/Demultiplexer  
Switch Evaluation Module  
SCDU001AJuly 2009Revised October 2009  
Copyright © 2009, Texas Instruments Incorporated  
 
 
EVM Configuration and Description  
3
EVM Configuration and Description  
3.1 EVM Description  
To conform to the USB 2.0 specification, the differential traces D+ and D- lines on the board are  
impedance matched to 90-differential. The trace length of the through-path and the trace length through  
the TS3USB221/A/E switch are also matched for comparison purpose. The PCB is a simple four-layer  
top-side populated board (see the schematic and PCB layout in Section 3.4 and Section 3.5). The major  
features of the hardware design are detailed in the following sections.  
3.2 Jumper Configuration (J6 to J8)  
The EVM has jumper J6 through J8 (see Figure 3) to provide configuration to the TS3USB221/A/E and the  
3.3-V LDO. J6 allows switch output channel select, J7 provides switch enable control, and J8 provides  
3.3-V LDO enable control. Table 1 lists all of the jumpers in the EVM and their respective functionality (all  
default settings are in bold).  
10 kW  
TS3USB221/A/E  
Output Select or  
Ouput Enable  
10 kW  
3.3-V LDO  
Ouput Enable  
Figure 3. Jumpers J6, J7, and J8 Configuration  
Table 1. EVM Jumper Description  
Jumper  
Functionality  
Configuration  
Shunt J6 to select output 1  
Open J6 to select output 2  
J6  
TS3USB221/A/E Select  
Shunt J7 to enable the switch  
Open J7 to disable the switch  
J7  
J8  
TS3USB221/A/E Enable  
3.3V LDO Enable  
Shunt J8 to disable the LDO  
Open J8 to enable the LDO  
The EVM provides USB connectors J1 through J5 to interface with other USB devices. Depending on the  
application need, the connectors can be de-soldered and changed to either type A or type B connector.  
See Table 2 for the default connectors on the EVM.  
Table 2. EVM Connector Description  
Connector  
Functionality  
Configuration  
Default as type B connector  
Can be replaced with type A connector  
J1  
USB Connector  
Default as type A connector  
Can be replaced with type B connector  
J2  
J3  
J4  
J5  
USB Connector  
USB Connector  
USB Connector  
USB Connector  
Default as type B connector  
Can be replaced with type A connector  
Default as type B connector  
Can be replaced with type A connector  
Default as type B connector  
Can be replaced with type A connector  
5
SCDU001AJuly 2009Revised October 2009  
TS3USB221/A/E High Speed USB 2.0 (480 Mbps) 1:2 Multiplexer/Demultiplexer  
Switch Evaluation Module  
Copyright © 2009, Texas Instruments Incorporated  
 
       
EVM Configuration and Description  
3.3 Board Stack-Up  
Table 3 shows the board stack-up.  
Table 3. Board Stack-Up  
Subclass  
Name  
Thickness Dielectric  
Loss  
Tangent  
Width Impedance Coupling Spacing  
Diff Zo  
()  
Type  
Shield  
(mils)  
Constant  
(mils)  
()  
Type  
(mils)  
1
2
3
4
5
6
7
8
9
SURFACE  
CONDUCTOR  
DIELECTRIC  
PLANE  
TOP  
GND  
2.4  
4
1
4.1  
1
0
0.035  
0
7.5  
47.72  
EDGE  
7.5  
85.004  
1.2  
48  
1.2  
4
YES  
YES  
DIELECTRIC  
PLANE  
4.1  
1
0.035  
0
VCC  
DIELECTRIC  
CONDUCTOR  
SURFACE  
4.1  
1
0.035  
0
7.5  
47.72  
EDGE  
7.5  
85.004  
BOTTOM  
2.4  
6
TS3USB221/A/E High Speed USB 2.0 (480 Mbps) 1:2 Multiplexer/Demultiplexer  
Switch Evaluation Module  
SCDU001AJuly 2009Revised October 2009  
Copyright © 2009, Texas Instruments Incorporated  
 
 
EVM Configuration and Description  
3.4 Schematics  
Figure 4. EVM Schematic  
7
SCDU001AJuly 2009Revised October 2009  
TS3USB221/A/E High Speed USB 2.0 (480 Mbps) 1:2 Multiplexer/Demultiplexer  
Switch Evaluation Module  
Copyright © 2009, Texas Instruments Incorporated  
 
   
EVM Configuration and Description  
3.5 PCB Layout  
Figure 5. Top Silkscreen/Assembly  
8
TS3USB221/A/E High Speed USB 2.0 (480 Mbps) 1:2 Multiplexer/Demultiplexer  
Switch Evaluation Module  
SCDU001AJuly 2009Revised October 2009  
Copyright © 2009, Texas Instruments Incorporated  
 
 
EVM Configuration and Description  
Figure 6. Top Metal (High-Speed Differential)  
9
SCDU001AJuly 2009Revised October 2009  
TS3USB221/A/E High Speed USB 2.0 (480 Mbps) 1:2 Multiplexer/Demultiplexer  
Switch Evaluation Module  
Copyright © 2009, Texas Instruments Incorporated  
 
 
EVM Configuration and Description  
Figure 7. Internal Ground Plane  
10  
TS3USB221/A/E High Speed USB 2.0 (480 Mbps) 1:2 Multiplexer/Demultiplexer  
Switch Evaluation Module  
SCDU001AJuly 2009Revised October 2009  
Copyright © 2009, Texas Instruments Incorporated  
 
 
EVM Configuration and Description  
Figure 8. Internal Power Plane  
11  
SCDU001AJuly 2009Revised October 2009  
TS3USB221/A/E High Speed USB 2.0 (480 Mbps) 1:2 Multiplexer/Demultiplexer  
Switch Evaluation Module  
Copyright © 2009, Texas Instruments Incorporated  
 
 
EVM Configuration and Description  
Figure 9. Bottom Metal (Low-Speed Single-Ended)  
12  
TS3USB221/A/E High Speed USB 2.0 (480 Mbps) 1:2 Multiplexer/Demultiplexer  
Switch Evaluation Module  
SCDU001AJuly 2009Revised October 2009  
Copyright © 2009, Texas Instruments Incorporated  
 
 
EVM Configuration and Description  
Figure 10. Bottom Silkscreen/Assembly  
13  
SCDU001AJuly 2009Revised October 2009  
TS3USB221/A/E High Speed USB 2.0 (480 Mbps) 1:2 Multiplexer/Demultiplexer  
Switch Evaluation Module  
Copyright © 2009, Texas Instruments Incorporated  
 
   
Related Documentation  
3.6 Bill of Materials  
Table 4. Bill of Materials  
Count  
RefDes  
Value  
Description  
Size  
Part Number  
Manufacturer  
2
J1, J3  
USB Connector Type A  
AU-Y1005  
Assmann Electronics Inc  
Molex / Waldom  
Electronics  
3
3
J2, J4, J5  
J6, J7, J8  
USB Connector Type B  
67068-9000  
100 mil x  
100 mil  
Sullins Connector  
Solutions  
Header, 2x1pin, 100mil spacing  
PEC36SAAN  
2
1
1
2
1
C1, C4  
C2  
1.0 μF  
10 nF  
Capacitor, Ceramic, 1.0uF, X7R, 10%  
Capacitor, Ceramic, 10nF, X7R, 10%  
Capacitor, Ceramic, 2.2uF, X7R, 10%  
Resistor, Chip, 10k, 1/8W, 5%  
805  
805  
805  
805  
805  
Std  
Std  
Std  
Std  
Std  
Std  
Std  
Std  
Std  
Std  
C3  
2.2 μF  
10 kΩ  
100 kΩ  
R1, R2  
R3  
Resistor, Chip, 100k, 1/8W, 5%  
TS3USB221/A/  
E
TS3USB221RSER/  
TS3USB221xRSER  
1
1
U1  
U2  
IC, High Speed 1:2 USB Switch  
IC, 150mA LDO regulator  
RSE  
TI  
TI  
LP2985-33  
SOT23-5  
LP2985-33DBV  
4
Related Documentation  
TS3USB221 High-Speed USB 2.0 (480Mbps) 1:2 Multiplexer/Demultiplexer Switch with Single Enable  
data sheet (SCDS220F)  
TS3USB221A ESD Protected, High-Speed USB 2.0 (480Mbps) 1:2 Multiplexer/Demultiplexer Switch with  
Single Enable data sheet (SCDS277)  
TS3USB221E High-Speed USB 2.0 (480Mbps) 1:2 Multiplexer/Demultiplexer Switch with Single Enable  
and IEC Level 3 ESD Protection data sheet (SCDS263)  
USB 2.0 Board Design and Layout Guidelines application report (SPRAAR7)  
High Speed USB Platform Design Guidelines, Intel, 2000,  
USB 2.0 Specification, Intel, 2000, http://www.usb.org/developers/docs  
14  
TS3USB221/A/E High Speed USB 2.0 (480 Mbps) 1:2 Multiplexer/Demultiplexer  
Switch Evaluation Module  
SCDU001AJuly 2009Revised October 2009  
Copyright © 2009, Texas Instruments Incorporated  
 
   
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