TS3A4741_15 Datasheet, PDF (17/26 Pages) Texas Instruments – TS3A474x 0.9-Ω Low-Voltage Single-Supply 2-Channel SPST Analog Switches

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TS3A4741, TS3A4742
SCDS228E – AUGUST 2006 – REVISED DECEMBER 2014
10 Power Supply Recommendations
Proper power-supply sequencing is recommended for all CMOS devices. Do not exceed the absolute maximum
ratings, because stresses beyond the listed ratings can cause permanent damage to the device. Always
sequence VCC on first, followed by NO, NC, or COM.
Although it is not required, power-supply bypassing improves noise margin and prevents switching noise
propagation from the VCC supply to other components. A 0.1-μF capacitor, connected from VCC to GND, is
adequate for most applications.
11 Layout
11.1 Layout Guidelines
High-speed switches require proper layout and design procedures for optimum performance. Reduce stray
inductance and capacitance by keeping traces short and wide. Ensure that bypass capacitors are as close to the
device as possible. Use large ground planes where possible.
11.2 Layout Example
LEGEND
VIA to Power Plane
Polygonal Copper Pour
VIA to GND Plane (Inner Layer)
To System
Bypass Capacitor
To System
To System
1 NO1
2 COM1
3 IN2
4 GND
VCC 8
IN1 7
COM2 6
NO2 5
Figure 21. PCB Layout Example
To System
To System
To System
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