G690L263T21 datasheet(1/12 Pages) GMT

部件名	G690L263T21

功能描述	Microprocessor Reset IC

PDF	12 Pages

Scroll/Zoom	100%

制造商	GMT [Global Mixed-mode Technology Inc]

网页	http://www.gmt.com.tw

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Ver: 1.3

Oct 31, 2002

TEL: 886-3-5788833

http://www.gmt.com.tw

1

G690/G691

Global Mixed-mode Technology Inc.

Microprocessor Reset IC

Features

Precision Monitoring of +3V, +3.3V, and +5V

Power-Supply Voltages

Fully Specified Over Temperature

Available in Three Output Configurations

Push-Pull RESET Output (G690L)

Push-Pull RESET Output (G690H)

Open-Drain RESET Output (G691L)

140ms min Power-On Reset Pulse Width

10µA Supply Current

Guaranteed Reset Valid to VCC = +1V

Power Supply Transient Immunity

No External Components

3-Pin SOT89, SOT23 and SC70 Packages

Applications

Computers

Controllers

Intelligent Instruments

Critical µP and µC Power Monitoring

Portable / Battery-Powered Equipment

Automotive

General Description

The G690/G691 are microprocessor (µP) supervisory

circuits used to monitor the power supplies in µP and

digital systems. They provide excellent circuit reliability

and low cost by eliminating external components and

adjustments when used with +5V, +3.3V, +3.0V- pow-

ered circuits.

These circuits perform a single function: they assert a

reset signal whenever the VCC supply voltage declines

below a preset threshold, keeping it asserted for at

least 140ms after VCC has risen above the reset

threshold. Reset thresholds suitable for operation with

a variety of supply voltages are available.

The G691L has an open-drain output stage, while the

G690 have push-pull outputs. The G691L’s open-drain

RESET output requires a pull-up resistor that can be

connected to a voltage higher than VCC. The G690L

have an active-low RESET output, while the G690H

has an active-high RESET output. The reset com-

parator is designed to ignore fast transients on VCC,

and the outputs are guaranteed to be in the correct

logic state for VCC down to 1V.

Low supply current makes the G690/G691 ideal for

use in portable equipment. The G690/G691 are avail-

able in 3-pin SOT89 or SOT23 or SC70 packages.

Pin Configuration

Typical Application

RESET

INPUT

GND

µP

V

CC

RESET

(RESET)

GND

G690/G691

V

CC

R

PULL-UP

V

CC

*

*G691 ONLY

SOT23/SC70

SOT 89

1

2

12

3

RESET

INPUT

GND

µP

V

CC

RESET

(RESET)

GND

G690/G691

V

CC

R

PULL-UP

V

CC

*

*G691 ONLY

SOT23/SC70

SOT 89

1

2

12

3

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