Micro-power voltage detector provides reset signal for digital systems

July 13, 2017 //By Nick Flaherty
Diodes has launched a micro-power voltage detector to accurately monitor the voltage levels in digital signals and generate a reset signal whenever a supply rail falls below a defined threshold.

Designed to support the supervisory circuits of microprocessors and microcontrollers, the reset function of the APX803L is required by many systems, including computers and communications equipment, but particularly portable battery-powered devices. The low quiescent current also makes it very attractive when appliances like televisions are 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, the APX803L 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 drop-in replacement and original designs. In 3000 piece tape & reel quantities the APX803L is priced at $0.09 each.

Further information is available in at  www.diodes.com