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AS1923 Datasheet(PDF) 2 Page - ams AG |
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AS1923 Datasheet(HTML) 2 Page - ams AG |
2 / 17 page AS1923 Quad-Voltage Microprocessor Supervisory Circuit www.austriamicrosystems.com/Supervisors/AS1923 Revision 1.01 1 - 16 Data sheet 1 General Description The AS1923 microprocessor supervisory circuit was designed to monitor up to four system supply voltages without the need for exter- nal components, and asserts a single reset if any of the monitored supply voltages drops below its reset threshold. The AS1923 features an active-low reset output that is asserted when any of the 4 monitored voltages are below their respective reset threshold. The reset output is open-drain with a weak internal pullup (10µA) to IN2. Reset remains low for a specified reset timeout period (120ms min) after all voltages have stabilized. The output is valid as long as the IN1 or IN2 input voltage remains >1V. Minimal external component requirements, small size, and wide tem- perature range (-40 to +85°C) greatly improves reliability compared to individual supervisory circuits or discrete components. A wide range of factory-trimmed threshold voltages are available to accommodate many different supply voltages/tolerances with mini- mal external component requirements. Factory-trimmed options are available for monitoring +5.0, +3.3, +3.0, +2.5, +1.8, and -5.0V supplies with -5% and/or -10% toler- ances. The device is also available with one or two user-adjustable threshold options (via external resistor-divider network) if non-stan- dard voltage thresholds are required. The AS1923 is available in an 6-pin SOT23 package. Figure 1. AS1923 - Typical Application 2 Key Features Simultaneous Quad-Voltage Monitoring Precision Factory-Trimmed Reset Threshold Options: +5.0, +3.3, +3.0, +2.5, +1.8, and -5.0V User-Adjustable Voltage Monitoring Threshold Options Low Supply Current: 55µA Open-Drain – AS1923A 10µA Current Source Pullup – AS1923B Reset Timeout Period: 120ms RESET Valid to IN1 = 1V or IN2 = 1V Immune to Fast INx Transients External Components not Required Guaranteed Performance: Operating Temperature Range = -40 to +85ºC 6-pin SOT23 Package 3 Applications The device is ideal for portable and battery-powered systems, embedded controllers, intelligent instruments, automotive systems, critical CPU monitoring, and any multi-supply application. 4 IN1 GND 2 AS1923 CPU Monitoring Voltage 1 Monitoring Voltage 2 Monitoring Voltage 3 Monitoring Voltage 4 6 IN3 1 IN4 5 IN2 3 RESETN RESETN |
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