RT9808-49CV Datasheet

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Preliminary

RT9808

Micro-Power Voltage Detectors

General Description

The RT9808 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 3碌A.

The RT9808 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 if VDD is above

threshold and last for the whole period of reset active

time out.

RT9808 is n-channel, open-drain output.

Features

Internally Fixed Threshold 1.5V to 5V in 0.1V Step

卤

2% Accuracy

Low Supply Current 3碌A

碌

Quick Reset within 20碌S

碌

Built-in Recovery Delay 200mS

Low Functional Supply Voltage 0.9V

N-Channel Open Drain Output

Small 3-Pin SOT-23/SOT89 and 5-Pin SOT-25

Packages

Pin Configurations

Part Number

RT9808-

CV

1

Pin Configurations

3

TOP VIEW

1. RESET

2. GND

3. VDD

TOP VIEW

1. RESET

2. VDD

3. GND

TOP VIEW

(Plastic SOT-23)

2

Applications

Computers

Controllers

Intelligent Instruments

Critical

碌P

and

碌C

Power Monitoring

Portable/Battery-Powered Equipment

RT9808-

CX

(Plastic SOT-89)

1

2

3

RT9808-

CB

5

4

(Plastic SOT-25)

Ordering Information

RT9808-

Package Type

V : SOT-23

X : SOT-89

B : SOT-25

Operating temperature range

C: Commercial standard

Reset Threshold

15 : 1.5V

16 : 1.6V

:

49 : 4.9V

50 : 5.0V

碌P

RESET

1

2

3

1.

2.

3.

4.

5.

RESET

VDD

GND

NC

NC

Typical Application Circuit

VDD

Pull

100K

Up

RT9808

GND

VDD

RESET

DS9808-01 January 2002

www.richtek-ic.com.tw

1

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