RT9801

Preliminary RT9801 User Programmable Micro-Power Voltage Detectors 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. The RT9801 performs supervisory function by sending out a reset signal whenever the VDD voltage falls below a preset threshold level. This reset signal will last the whole period before VDD recovering. Reset signal will release after VDD is recovered and lasts for the whole period of Reset Active Time-out period. RT9801 is N-channel, open-drain output and provided in SOT-26 package. Ordering Information RT9801… … … Package Type E : SOT-26 Operating temperature range C: Commercial standard Reset Threshold A : 2.5V~5V B : 1.5V~4V Features z User Programmable Threshold 1.5V to 5V in 0.1V Step with ±3% Accuracy z Low Supply Current 3µA z Quick Reset within 20µS z Built-in Recovery Delay 200mS z Low Functional Supply Voltage 0.9V z Small SOT-26 Package Applications z Computers z Controllers z Intelligent Instruments z Critical µP and µC Power ...