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Micro-power voltage detector monitors power supplies in computers and digital systems

Designed to support the supervisory circuits of microprocessors and microcontrollers, Diodes has introduced the APX803L micro-power voltage detector. The device allows accurate monitoring of voltage levels and is also able to generate a reset signal whenever a supply rail falls below a defined threshold.

The ability to reset signals is required by many systems, including computers and communications equipment, but particularly portable battery-powered devices.

The APX803L’s low quiescent current also makes it suitable for appliances like televisions operating in standby mode.

Offered in a detection voltage level range of 1.2V to 5.0V in 0.1V steps, the APX803L provides a threshold accuracy of ±1.5%, while consuming just 1μA and requiring no external components. Whenever the monitored VCC power supply rail drops below the chosen threshold, it asserts a reset signal within 20μs that is held until the supply rail recovers to a level above the threshold. The device’s reset pin provides an open-drain, active-low output with device ordering options that allow for delay times of 0ms, 55ms, 220ms, or 450ms.

Available in 3-pin SOT23, SOT323, and SC59 packages and a 5-pin SOT25 package, the APX803L supports both drop-in replacement and original designs.

Neil Tyler

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