_______________General Description

The MAX691A/MAX693A/MAX800L/MAX800M micro-

processor (µP) supervisory circuits are pin-compatible

upgrades to the MAX691, MAX693, and MAX695. They

improve performance with 30µA supply current, 200ms

typ reset active delay on power-up, and 6ns chip-

enable propagation delay. Features include write pro-

tection of CMOS RAM or EEPROM, separate watchdog

outputs, backup-battery switchover, and a RESET out-

MAX800L have a 4.65V typical reset-threshold voltage,

and the MAX693A/MAX800M’s reset threshold is 4.4V

typical. The MAX800L/MAX800M guarantee power-fail

accuracies to ±2%.

________________________Applications

Computers

Controllers

Intelligent Instruments

Automotive Systems

Critical µP Power Monitoring

____________________________Features

o 200ms Power-OK/Reset Timeout Period

o 1µA Standby Current, 30µA Operating Current

o On-Board Gating of Chip-Enable Signals,

10ns Max Delay

o Guaranteed R

RE

ES

SE

ET

o Voltage Monitor for Power-Fail or Low-Battery

Warning

o Power-Fail Accuracy Guaranteed to ±2%

(MAX800L/M)

o Available in 16-Pin Narrow SO and Plastic

DIP Packages

______________Ordering Information

Ordering Information continued on last page.

Microprocessor Supervisory Circuits

________________________________________________________________

Maxim Integrated Products

1

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

RESET

RESET

WDO

CE IN

GND

VBATT

TOP VIEW

MAX691A

MAX693A

MAX800L

MAX800M

CE OUT

WDI

PFO

PFI

OSC SEL

OSC IN

LOW LINE

BATT ON

DIP/SO

__________________Pin Configuration

MAX691A

MAX693A

MAX800L

MAX800M

BATT ON

CE OUT

CE IN

WDI

PFO

RESET

VBATT

PFI

GND

OSC IN

OSC SEL

1

9

4

7

8

ADDRESS

DECODE

AUDIBLE

ALARM

5V

REGULATOR

+8V

0.1

µF

CMOS RAM

2

12

11

10

15

13

5

3

A0-A15

I/O

NMI

RESET

µP

LOW LINE WDO

SYSTEM STATUS INDICATORS

NO

CONNECTION

0.47F*

1N4148

*MaxCap

614

__________Typical Operating Circuit

19-0094; Rev 7a; 12/96

PART

MAX691ACPE

MAX691ACSE

MAX691ACWE

0°C to +70°C

0°C to +70°C

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

16 Plastic DIP

16 Narrow SO

16 Wide SO

MAX691AC/D

MAX691AEJE

-40°C to +85°C

0°C to +70°C

Dice*

16 CERDIP

MAX691AEPE

MAX691AESE

-40°C to +85°C

-40°C to +85°C

16 Plastic DIP

16 Narrow SO

MAX691AEWE

-40°C to +85°C

16 Wide SO

MAX691AMJE

-55°C to +125°C

16 CERDIP

SuperCap is a registered trademark of Baknor Industries. MaxCap is a registered trademark of The Carborundum Corp.

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 408-737-7600 ext. 3468.