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AS1920

austriamicrosystems AG
Part Number AS1920
Manufacturer austriamicrosystems AG
Description Triple-Voltage Micro-Power Microprocessor Supervisory Circuits
Published Mar 14, 2010
Detailed Description www.DataSheet4U.com AS1920, AS1922 Tr i p l e - Vo l ta g e , M i c r o - P o w e r M i c r o p r o c e s s o r Supervi...
Datasheet PDF File AS1920 PDF File

AS1920
AS1920

Overview
www.
DataSheet4U.
com AS1920, AS1922 Tr i p l e - Vo l ta g e , M i c r o - P o w e r M i c r o p r o c e s s o r Supervi s ory Ci rcuits D a ta S h e e t 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.
2µA, 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-voltage systems with low current requirements and strict monitoring requirements.
The devices are available as the standard products listed in Table 1.
Table 1.
Standard Products Model AS1920-18 AS1922-18 Output Type Push/Pull Open-Drain Supervisory Voltages 3V, 1.
8V, Adjustable 3V, 1.
8V, Adjustable 2 Key Features ! Simultaneous Triple-Voltage Monitoring Very-Low Supply Current: 6.
2µA ±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 ! ! ! ! ! ! All devices monitor primary and secondary factorytrimmed 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.
! ! 3 Applications The devices are ideal for personal computers, notebooks, battery-powered systems, embedded controllers, intelligent instruments, automotive systems, critical CPU monitoring, and any multi-supply monitoring application.
Figure 1.
Typical Application Diagram 3V 1.
8V 2.
5V 5 VCC3 4 R1 130kΩ 1% 0.
1µF R2 100kΩ 1% VCC18 3 VCCA System Logic AS1920/ AS1922 1 RESETN 2 GND 0.
1µF www.
austriamicrosystems.
com ...


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