FUNCTIONAL BLOCK DIAGRAM

RESET

ADM709

RESET

GENERATOR

GND

RESET

ADM709

GND

GND

µP

RESET

Typical Operating Circuit

ORDERING GUIDE

Reset

Temperature

Package

Model

Threshold

Range

Option*

ADM709LAN

4.65 V

–40

°C to +85°C N-8

ADM709LAR

4.65 V

–40

°C to +85°C SO-8

ADM709MAN

4.40 V

–40

°C to +85°C N-8

ADM709MAR

4.40 V

–40

°C to +85°C SO-8

ADM709TAN

3.08 V

–40

°C to +85°C N-8

ADM709TAR

3.08 V

–40

°C to +85°C SO-8

ADM709SAN

2.93 V

–40

°C to +85°C N-8

ADM709SAR

2.93 V

–40

°C to +85°C SO-8

ADM709RAN

2.63 V

–40

°C to +85°C N-8

ADM709RAR

2.63 V

–40

°C to +85°C SO-8

*N = Plastic DIP; SO = SOIC.

REV. 0

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

a

Power Supply Monitor

with Reset

ADM709

© Analog Devices, Inc., 1995

One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.

Tel: 617/329-4700

Fax: 617/326-8703

GENERAL DESCRIPTION

The ADM709 contains a power supply monitor which generates

a system reset during power-up, power-down and brownout

goes low and holds the

µP in reset. On power-up the RESET

as 1 V.

Three supply-voltage threshold levels are available suitable for

+5 V, +3.3 V and for +3 V supply monitoring. The actual reset

voltage threshold is given below.

The ADM709 is available in 8-pin DIP and SOIC packages.

Table I. Reset Threshold

Suffix

Voltage (V)

L

4.65

M

4.40

T

3.08

S

2.93

R

2.63

FEATURES

Precision Supply Voltage Monitor

+5 V, +3.3 V, +3 V Power Supply Monitor

35

A Quiescent Current

140 ms (min) Power-On Reset Pulse

Low Cost

8-Pin DIP/SO Packages

Upgrade for MAX709

APPLICATIONS

Microprocessor Systems

Computers

Controllers

Intelligent Instruments

Critical

P Monitoring

Automotive Systems

Critical

P Power Monitoring