HD3SS3412_16 Datasheet, PDF (18/27 Pages) Texas Instruments – 4-Channel High-Performance Differential Switch

HD3SS3412
SLAS828E – FEBRUARY 2012 – REVISED JANUARY 2016
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11 Power Supply Recommendations
The HD3SS3412 requires +3.3-V digital power sources. VDD 3.3 supply must have 0.1-μF bypass capacitors to
VSS (ground) in order for proper operation. The recommendation is one capacitor for each power terminal. Place
the capacitor as close as possible to the terminal on the device and keep trace length to a minimum. Smaller
value capacitors like 0.01-μF are also recommended on the digital supply terminals.
12 Layout
12.1 Layout Guidelines
• Decoupling caps should be placed next to each power terminal on the HD3SS3412. Take care to minimize
the stub length of the race connecting the capacitor to the power pin.
• Avoid sharing vias between multiple decoupling caps
• Place vias as close as possible to the decoupling cop solder pad
• Widen VDD/GND planes to reduce effect if static and dynamic IR drop
• The VBUS traces/planes must be wide enough to carry maximum of 2-A current
12.2 Layout Example
VIA to SW Cooper Pour
Use controlled-impedance
Transmission media for all
Differential signals
VDD3P3
VDD3P3
VSS
AX+
AX-
BX+
BX-
CX+
CX-
GND
3.3V Logic level
SEL
VBUS
VBUS traces wide
enough to carry 2A
current
Exposed Thermal
Pad Are
Figure 17. Layout Example
18
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