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AS1922 Datasheet(PDF) 1 Page - ams AG |
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AS1922 Datasheet(HTML) 1 Page - ams AG |
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1 / 14 page  AS1920, AS1922 Tr iple-Volta ge, Micro-Power Microprocessor Supervi s ory Ci rcuits Dat a Sheet www.austriamicrosystems.com Revision 1.00 1 - 14 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-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: 6.2µA ! ±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 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 Ω 1% R2 100k Ω 1% 0.1µF 1 RESETN 3 VCCA 2 GND 4 VCC18 5 VCC3 |
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