RT9811-48CB datasheet(1/6 Pages) ETC

Part #	RT9811-48CB

Description	RT9811-47CB

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Preliminary

RT9811

DS9811-00 June 2001

www.richtek-ic.com.tw

1

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 (

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 2.5

µA.

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.

Applications

Computers

Controllers

Intelligent Instruments

Critical

µP and µC Power Monitoring

Portable/Battery-Powered Equipment

Ordering Information

RT9811-

Features

Internally Fixed Threshold 1.5V to 5V in 0.1V

Step

±±±±2% Accuracy

Low Supply Current 2.5

µµµµA

No External Components Required

Quick Reset within 20

µµµµS

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

Pin Configurations

RT9811-

CB

(SOT-25)

TOP VIEW

1. GND

2. NC

3. RESET

4. MR

5. VDD

Typical Application Circuit

54

3

2

1

Operating temperature range

C: Commercial standard

Package Type

B : SOT-25

Reset Threshold

15 : 1.5V

16 : 1.6V

:

49 : 4.9V

50 : 5.0V

VDD

µP

RESET

RT9811

VDD

RESET

MR

GND

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