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Supervisory IC monitors up to four supply voltages

Posted: 02 Aug 2007 ?? ?Print Version ?Bookmark and Share

Keywords:quad-voltage microprocessor supervisory IC?


austriamicrosystems has expanded its supervisory portfolio with the AS1923, a quad-voltage microprocessor supervisory IC. AS1923 was designed to monitor up to four system supply voltages without the need for external components and asserts a single reset if any of the monitored supply voltages drops below its reset threshold.

Different factory-trimmed voltage threshold options are available for monitoring 5-, 3.3-, 3-, 2.-5, 1.8- and -5V supplies with -5 percent and/or -10 percent tolerances. AS1923 is also available with one or two user-adjustable threshold options (via external resistor-divider network) if non-standard voltage thresholds are required.

The internally trimmed thresholds and the two reset output options minimize the need for external components. The open-drain output can be overdriven by external voltages ranging from 0V to 5.5V to provide easy interfacing to other devices.

AS1923 features an active-low reset output that is asserted when any of the four monitored voltages are below their respective reset threshold. The reset output is available as open-drain (AS1923A) or 10?A Current Source Pullup (AS1923B). 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 above 1V.

The AS1923 IC operates from 1V to 5.5V, while consuming only 55?A of supply current. Minimal external component requirements and small size greatly improves reliability compared to individual supervisory circuits or discrete components.

The devices are available in a small 6-pin SOT23 package, suitable for operating environments ranging from -40C to 85C.

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