Micro-Power Voltage Detector Monitors ITC Power Supplies
Diodes Incorporated today 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.
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. 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.
