RT9811

Preliminary RT9811 Micro-Power Voltage Detectors General Description The RT9811 is www.datasheet4u.com a micro-power voltage detector with de-glitched manual reset input supervising the power supply voltage level for microprocessors (µP) or digital systems. It provides internally fixed threshold levels with 0.1V per step ranging from 1.5V to 5V, which covers most digital applications. It features low supply current of 2.5µA. The RT9811 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. Once VDD recovered up-crossing the threshold level, the reset signal will be released after a certain delay time. A 5% hysteresis splits the rising and falling threshold levels. To pull reset signal low manually, just pull the manual reset input (MR) below the specified VIL level. RT9811 is provided in SOT-25 package. 1 2 3 z z z z z z z z Features z Internally Fixed Threshold 1.5V to 5V in 0.1V Step ±2% Accuracy Low Supply Current 2.5µA No External Components Required Quick Reset within 20µS Built-in Recovery Delay 400mS 100nS Glitch Immunity of Manual Reset Input Low Functional Supply Voltage 0.9V Small 4-Pin SOT-25 Package Pin Configurations Part Number RT9811-……CB (SOT-25) Pin Configurations TOP VIEW 5 4 1. 2. 3. 4. 5. GND NC RESET MR VDD Applications z z z z z Typical Application Circuit Computers Controllers Intelligent Instruments Critical ...