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07-20-2017

Micro-Power Voltage Detector from Diodes Incorporated Monitors Power Supplies in Computers and Digital Systems

Diodes » APX803L

Diodes Incorporated introduced the APX803L. This micro-power voltage detector is designed to support the supervisory circuits of microprocessors and microcontrollers by enabling accurate monitoring of voltage levels and will generate a reset signal whenever a supply rail falls below a defined threshold. This function is required by many systems such as computers, communications equipment, and portable battery-powered devices. The APX803L’s low quiescent current also makes it very attractive when appliances like televisions are operating in standby mode.

Diodes - APX803L

Offered in a detection voltage level range of 1.2 V to 5.0 V in 0.1 V steps, the APX803L provides a threshold accuracy of ±1.5%, while consuming just 1 μA and requiring no external components. Whenever the monitored VCC power supply rail drops below the chosen threshold, the APX803L asserts a reset signal within 20 μs 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 0 ms, 55 ms, 220 ms, or 450 ms.

Functional Block Diagram
Functional Block Diagram.

The APX803L is available in 3-pin SOT23, SOT323, and SC59 packages, as well as a 5-pin SOT25 package, and supports drop-in replacements and original designs.

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