General Description
The RT9801 is a micro-power voltage detector supervising the power supply voltage level for microprocessors (µP) or digital systems. It provides user programmable threshold levels with 0.1V step ranging from 1.5V to 5V, which covers most digital applications. It features low supply current of 3µA. Selection of VTH is easily achieved through 3 pins connected to GND, VDD or floating for different threshold voltage settings. Two versions of threshold voltages, 1.5V ~ 4V and 2.5V ~ 5V, which are programmed in factory are offered by customer demands.

Features
• User Programmable Threshold 1.5V to 5V in 0.1V Step with ±3% Accuracy
• Low Supply Current 3µA
• Quick Reset within 20µS
• Built-in Recovery Delay 200mS
• Low Functional Supply Voltage 0.9V
• Small SOT-26 Package

Applications
• Computers
• Controllers
• Intelligent Instruments
• Critical µP and µC Power Monitoring
• Portable/Battery-Powered Equipment