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Preliminary

RT9809

Micro-Power Voltage Detectors

General Description

The RT9809 is a micro-power voltage detector

supervising the power supply voltage level for

microprocessors (碌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碌A(chǔ).

The RT9809 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.

RT9809 is provided in SOT-23 package.

Features

Internally Fixed Threshold 1.5V to 5V in 0.1V

Step

鹵

2% Accuracy

Low Supply Current 2.5碌A(chǔ)

碌

No External Components Required

Quick Reset within 20碌S

碌

Built-in Recovery Delay 400mS

Low Functional Supply Voltage 0.9V

Small 3-Pin SOT-23 Package

Pin Configurations

Part Number

RT9809-

(SOT-23)

1

2

Pin Configurations

TOP VIEW

3

CV

1. GND

2. RESET

3. VDD

Applications

Computers

Controllers

Intelligent Instruments

Critical

碌P

and

碌C

Power Monitoring

Portable/Battery-Powered Equipment

Typical Application Circuit

VDD

碌

P

RESET

RESET

RT9809

GND

VDD

Ordering Information

RT9809-

Package Type

V : SOT-23

Operating temperature range

C: Commercial standard

Reset Threshold

15 : 1.5V

16 : 1.6V

:

49 : 4.9V

50 : 5.0V

DS9809-00 June 2001

www.richtek-ic.com.tw

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