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AS1920 Datasheet(PDF) 1 Page - ams AG

Part No. AS1920
Description  Triple-Voltage, Micro-Power Microprocessor Supervisory Circuits
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Maker  AMSCO [ams AG]
Homepage  http://www.ams.com
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AS1920 Datasheet(HTML) 1 Page - ams AG

   
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AS1920, AS1922
Triple-Voltage, Micro-Power Microprocessor
Supervisory Circuits
austriamicrosystems
Pro duct Brief
www.austriamicrosystems.com
Revision 0.65
1 - 2
1 General Description
The AS1920 and AS1922 microprocessor supervisory
circuits were designed to generate a reset when at least
one of the three monitored supply voltages falls below
its respective trip threshold.
These very-low-current (6.5µA, typ) devices maintain
reset for a minimum timeout period after all supplies
have stabilized. Guaranteed to be in the correct state for
VCC > +1.0V, these devices are perfect for multiple-volt-
age systems with low current requirements and strict
monitoring requirements.
The devices are available as the standard products
listed in Table 1.
All devices monitor primary and secondary factory-
trimmed voltages. Additionally, a third monitoring voltage
can be selected via an external resistor divider.
The AS1920 has an active-low push/pull reset output,
whereas the AS1922 has an active-low open-drain reset
output.
The AS1920 and AS1922 are available in a 5-pin
SOT23 package.
Figure 1. Typical Application Diagram
2 Key Features
!
Simultaneous Triple-Voltage Monitoring
!
Very-Low Supply Current: 6.5µA
!
±1.5% Accuracy Over Temperature
!
Reset Time Delay: 200ms
!
Power Supply Transient Immunity
!
Guaranteed Reset for VCC3
≥ 1V or VCC18 ≥ 1V
!
Active-Low Push/Pull Reset Output (AS1920)
!
Active-Low Open-Drain Reset Output (AS1922)
!
5-pin SOT23 Package
3 Applications
The devices are ideal for personal computers, note-
books, battery-powered systems, embedded controllers,
intelligent instruments, automotive systems, critical CPU
monitoring, and any multi-supply monitoring application.
Table 1. Standard Products
Model
Output Type
Supervisory Voltages
AS1920-18
Push/Pull
3V, 1.8V, Adjustable
AS1922-18
Open-Drain
3V, 1.8V, Adjustable
3V
System
Logic
1.8V
2.5V
AS1920/
AS1922
0.1µF
R1
130k
1%
R2
100k
1%
0.1µF
1
RESETN
3
VCCA
2
GND
4
VCC18
5
VCC3


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