User's Guide
SCDU001A–July 2009–Revised 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
SCDU001A–July 2009–Revised October 2009
TS3USB221/A/E High Speed USB 2.0 (480 Mbps) 1:2 Multiplexer/Demultiplexer
Switch Evaluation Module
Copyright © 2009, Texas Instruments Incorporated
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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
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
SCDU001A–July 2009–Revised October 2009
TS3USB221/A/E High Speed USB 2.0 (480 Mbps) 1:2 Multiplexer/Demultiplexer
Switch Evaluation Module
Copyright © 2009, Texas Instruments Incorporated
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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
SCDU001A–July 2009–Revised October 2009
Copyright © 2009, Texas Instruments Incorporated
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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-Ω 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.
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
SCDU001A–July 2009–Revised October 2009
TS3USB221/A/E High Speed USB 2.0 (480 Mbps) 1:2 Multiplexer/Demultiplexer
Switch Evaluation Module
Copyright © 2009, Texas Instruments Incorporated
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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
(Ω)
Type
Shield
(mils)
Constant
(mils)
(Ω)
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
SCDU001A–July 2009–Revised October 2009
Copyright © 2009, Texas Instruments Incorporated
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EVM Configuration and Description
3.4 Schematics
Figure 4. EVM Schematic
7
SCDU001A–July 2009–Revised October 2009
TS3USB221/A/E High Speed USB 2.0 (480 Mbps) 1:2 Multiplexer/Demultiplexer
Switch Evaluation Module
Copyright © 2009, Texas Instruments Incorporated
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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
SCDU001A–July 2009–Revised October 2009
Copyright © 2009, Texas Instruments Incorporated
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EVM Configuration and Description
Figure 6. Top Metal (High-Speed Differential)
9
SCDU001A–July 2009–Revised October 2009
TS3USB221/A/E High Speed USB 2.0 (480 Mbps) 1:2 Multiplexer/Demultiplexer
Switch Evaluation Module
Copyright © 2009, Texas Instruments Incorporated
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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
SCDU001A–July 2009–Revised October 2009
Copyright © 2009, Texas Instruments Incorporated
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EVM Configuration and Description
Figure 8. Internal Power Plane
11
SCDU001A–July 2009–Revised October 2009
TS3USB221/A/E High Speed USB 2.0 (480 Mbps) 1:2 Multiplexer/Demultiplexer
Switch Evaluation Module
Copyright © 2009, Texas Instruments Incorporated
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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
SCDU001A–July 2009–Revised October 2009
Copyright © 2009, Texas Instruments Incorporated
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EVM Configuration and Description
Figure 10. Bottom Silkscreen/Assembly
13
SCDU001A–July 2009–Revised October 2009
TS3USB221/A/E High Speed USB 2.0 (480 Mbps) 1:2 Multiplexer/Demultiplexer
Switch Evaluation Module
Copyright © 2009, Texas Instruments Incorporated
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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, 10kΩ, 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, 100kΩ, 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
TS3USB221A ESD Protected, High-Speed USB 2.0 (480Mbps) 1:2 Multiplexer/Demultiplexer Switch with
TS3USB221E High-Speed USB 2.0 (480Mbps) 1:2 Multiplexer/Demultiplexer Switch with Single Enable
High Speed USB Platform Design Guidelines, Intel, 2000,
14
TS3USB221/A/E High Speed USB 2.0 (480 Mbps) 1:2 Multiplexer/Demultiplexer
Switch Evaluation Module
SCDU001A–July 2009–Revised October 2009
Copyright © 2009, Texas Instruments Incorporated
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