TS3USB221A_15 Datasheet, PDF (15/25 Pages) Texas Instruments – TS3USB221A ESD Protected, High-Speed USB 2.0 (480-Mbps) 1:2 Multiplexer and Demultiplexer Switch With Single Enable

www.ti.com
TS3USB221A
SCDS277A – NOVEMBER 2008 – REVISED FEBRUARY 2015
Typical Application (continued)
10.2.1 Design Requirements
Design requirements of the USB 1.0,1.1, and 2.0 standards should be followed.
It is recommended that the digital control pins S and OE be pulled up to V_CC or down to GND to avoid undesired
switch positions that could result from the floating pin.
10.2.2 Detailed Design Procedure
The TS3USB221A 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.
10.2.3 Application Curves
0.5
0.4
0.3
0.2
0.1
0.0
–0.1
–0.2
–0.3
–0.4
–0.5
0.0 0.2 0.4 0.5 0.8 1.0 1.2 1.4 1.6 1.8 2.0
Time (X 10^–9) (s)
Figure 17. Eye Pattern: 480-Mbps USB Signal With No
Switch (Through Path)
0.5
0.4
0.3
0.2
0.1
0.0
–0.1
–0.2
–0.3
–0.4
–0.5
0.0 0.2 0.4 0.5 0.8 1.0 1.2 1.4 1.6 1.8 2.0
Time (X 10^–9) (s)
Figure 18. Eye Pattern: 480-Mbps USB Signal With Switch
NC Path
0.5
0.4
0.3
0.2
0.1
0.0
–0.1
–0.2
–0.3
–0.4
–0.5
0.0 0.2 0.4 0.5 0.8 1.0 1.2 1.4 1.6 1.8 2.0
Time (X 10^–9) (s)
Figure 19. Eye Pattern: 480-Mbps USB Signal With Switch NO Path
Copyright © 2008–2015, Texas Instruments Incorporated
Product Folder Links: TS3USB221A
Submit Documentation Feedback
15