General Description

The MAX698/MAX699 monitor the +5V supply in micro-

processor (µP) and digital systems. They supply a

RESET pulse of at least 140ms duration on power-up,

power-down, and during low-voltage brownout condi-

tions. Circuit reliability is increased at reduced cost by

eliminating all external components and adjustments.

The MAX699 includes all features of the MAX698, but

also provides a watchdog input to monitor microproces-

sor activity. The RESET output goes low if the watchdog

input (WDI) is not toggled within 1 second. The watch-

dog feature can be disabled by leaving WDI open.

Both parts are supplied in 8-lead PDIP and 16-lead

0.3in wide small outline (SO) packages and are speci-

fied from 0°C to +70°C for C grade devices and -40°C

to +85°C for E devices. The SO versions, with more

pins than the 8-lead PDIP, have additional outputs not

available in DIP packages. These are RESET (without

inversion) and watchdog output (WDO).

Applications

Computers

Controllers

Intelligent Instruments

Automotive Systems

Critical µP Power Monitoring

Features

♦ Precision Voltage Monitor

♦ Power-OK/Reset Time Delay

♦ Watchdog Timer

♦ Minimum Component Count

Low-Cost, Power-On Reset

and Watchdog Controllers

________________________________________________________________ Maxim Integrated Products

1

19-2349; Rev 3; 12/05

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

RESET

GND

GND

GND

N.C.

N.C. (WDI)*

MAX698

MAX699*

1

2

3

4

8

7

6

5

DIP

SO

RESET

RESET

GND

GND

N.C.

N.C. (WDO)*

MAX698

MAX699*

1

2

3

4

16

15

14

13

N.C.

N.C.

N.C.

N.C.

N.C.

GND

N.C.

N.C. (WDI)*

5

6

7

8

12

11

10

9

TOP VIEW

* PIN LABELS IN ( ) ARE FOR MAX699 ONLY

Pin Configuration

Ordering Information

MAX698

1

2

3

4

GND

GND

GND

RESET

N.C.

N.C.

8

7

6

5

+5V

+5V

TO µP

RESET

INPUT

Typical Operating Circuit

PART*

TEMP RANGE

PIN-PACKAGE

MAX698CPA

0°C to +70°C

8 PDIP

MAX698CWE

0°C to +70°C

16 Wide SO

MAX698EPA

-40°C to +85°C

8 PDIP

MAX698EWE

-40°C to +85°C

16 Wide SO

MAX699CPA

0°C to +70°C

8 PDIP

MAX699CWE

0°C to +70°C

16 Wide SO

MAX699EPA

-40°C to +85°C

8 PDIP

MAX699EWE

-40°C to +85°C

16 Wide SO

ing. Specify lead free by adding the + symbol at the end of the

part number when ordering.