AS1743 austriamicrosystems, AS1743 Datasheet - Page 9

• Manufacturer Part Number: AS1743
• Description: (AS1741 - AS1743) Dual SPST Analog Switches
• Manufacturer: austriamicrosystems

AS1741, AS1742, AS1743
Data Sheet
9 Application Information
Power Supply Sequencing
Proper power-supply sequencing is critical for proper switch operation. The power supplies should be started up in the
following sequence:
1. V+
2. NO x, NC x, COM x
Note: Operation beyond the absolute maximum ratings (see page 2) may permanently damage the devices.
Power Supply Bypass
Power supply connections to the devices must maintain a low impedance to ground. This can be done using a bypass
capacitor, which will also improve noise margin and prevent switching noise propagation from the V+ supply to other
components.
A 0.1µF bypass capacitor, connected from V+ to GND (see
Logic Inputs
Driving IN x Rail-to-Rail will help minimize power consumption.
Layout Considerations
High-speed switches require proper layout and design procedures for optimum performance.
Timing Diagrams and Test Setups
Figure 12. AS1741/ AS1743 Test Circuit and Timing Diagram
Figure 13. AS1742 / AS1743 Test Circuit and Timing Diagram
www.austriamicrosystems.com
!
!
!
Short, wide traces should be used to reduce stray inductance and capacitance.
Bypass capacitors should be as close to the device as possible.
Large ground planes should be used wherever possible.
V+
V+
50Ω
50Ω
V+
INx
V+
INx
AS1742/
AS1741/
AS1743
AS1743
GND
GND
COMx
COMx
NOx
NCx
50Ω
50Ω
V
V
NOx
NCx
35pF
35pF
V
V
COMx
COMx
Revision 1.76
Figure 17 on page
V
V
V
V
COMx
COMx
IH
IH
IN
IN
+ 0.5V
+ 0.5V
x
V
x
V
NCx
NOx
0
0
0
0
11), is adequate for most applications.
90%
50%
t
50%
OFF
90%
t
ON
austriam i c r o
Power Supply Sequencing
50%
t
50%
OFF
t
ON
t
t
90%
R
t
F
t
R
F
< 5ns
< 5ns
systems
90%
< 5ns
< 5ns
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