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Preliminary |
RT9811 |
Micro-Power Voltage Detectors
General Description
The RT9811 is a micro-power voltage detector with de-glitched manual reset input supervising the power supply voltage level for microprocessors ( P) 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 2.5 A.
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.
Features
zInternally Fixed Threshold 1.5V to 5V in 0.1V Step
z±2% Accuracy
zLow Supply Current 2.5 A
zNo External Components Required
zQuick Reset within 20 S
zBuilt-in Recovery Delay 400mS
z100nS Glitch Immunity of Manual Reset Input
zLow Functional Supply Voltage 0.9V
zSmall 4-Pin SOT-25 Package
Pin Configurations
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Pin Configurations |
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RT9811CB |
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TOP VIEW |
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1. GND |
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NC |
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RESET |
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MR |
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VDD |
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Applications |
Typical Application Circuit |
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Computers |
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Controllers |
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VDD |
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RT9811 |
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Intelligent Instruments |
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GND |
VDD |
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Critical P and C Power Monitoring |
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P |
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Portable/Battery-Powered Equipment |
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Ordering Information |
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RESET |
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RESET |
MR |
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RT9811-
Package Type
B : SOT-25
Operating temperature range C: Commercial standard Reset Threshold
15 : 1.5V
16 : 1.6V
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49 : 4.9V
50 : 5.0V
DS9811-00 June 2001 |
www.richtek-ic.com.tw |
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RT9811 |
Preliminary |
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Pin Description |
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Pin Name |
Pin Function |
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GND |
Ground Pin |
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NC |
Not Connected |
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RESET |
Reset Pulse Output, Negative Pulse |
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MR |
Manual Reset Input, Pull Low to Reset, Internally Pulled High with 1 A Current Source |
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VDD |
Power Pin |
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Function Block Diagram
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VDD |
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VDD |
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CMP |
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P |
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VSET |
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TIMER |
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RESET |
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N |
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Threshold Voltage Setting |
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POR
Power On Reset
MR MR
Manual Reset
www.richtek-ic.com.tw |
DS9811-00 June 2001 |
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