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MAX697EWE

Microprocessor Supervisory Circuits

Maxim Integrated 

MAX696/MAX697

Microprocessor Supervisory Circuits

General Description

The MAX696/MAX697 supervisory circuits reduce the

complexity and number of components required for

power-supply monitoring and battery-control functions

in microprocessor (μP) systems. These include μP reset

and backup-battery switchover, watchdog timer, CMOS

RAM write protection, and power-failure warning. The

MAX696/MAX697 significantly improve system reliability

and accuracy compared to that obtained with separate

ICs or discrete components.

The MAX696 and MAX697 are supplied in 16-pin pack-

ages and perform six functions:

1) A reset output during power-up, power-down, and

brownout conditions. The threshold for this “lowline”

reset is adjustable by an external voltagedivider.

2) A reset pulse if the optional watchdog timer has not

been toggled within a specified time.

3) Individual outputs for low-line and watchdog fault con-

ditions.

4) The reset time may be left at its default value of 50ms,

or may be varied with an external capacitor or clock

pulses.

5) A separate 1.3V threshold detector for power-fail warn-

ing, low-battery detection, or to monitor a power supply

other than VCC.

The MAX696 also has battery-backup switching for CMOS

RAM, CMOS microprocessor, or other lowpower logic.

The MAX697 lacks battery-backup switching, but has

write-protection pins (CE IN and CE OUT) for CMOS

RAM or EPROM. In addition, it consumes less than 250

microamperes.

Applications

●● Computers

●● Controllers

●● Intelligent Instruments

●● Critical μP Power Monitoring

Typical Operating Circuit appears at end of data sheet.

Pin Configurations continued at end of data sheet.

Features

●● Adjustable Low-Line Monitor and Power-Down Reset

●● Power-OK/Reset Time Delay

●● Watchdog Timer—100ms, 1.6s, or Adjustable

●● Minimum Component Count

●● 1μA Standby Current

●● Battery-Backup Power Switching (MAX696)

●● On-Board Gating of Chip-Enable Signals (MAX697)

●● Separate Monitor for Power-Fail or Low-Battery

Warning

Ordering Information

PART

MAX696C/D

MAX696CPE

MAX696CWE

MAX696EPE

MAX696EJE

MAX696EWE

MAX696MJE

TEMP RANGE

0°C to +70°C

0°C to +70°C

0°C to +70°C

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

-55°C to +125°C

PIN-PACKAGE

Dice

16 PDIP

16 Wide SO

16 PDIP

16 CERDIP

16 Wide SO

16 CERDIP

Ordering Information continued at end of data sheet.

Devices in PDIP and SO packages are available in both leaded

and lead(Pb)-free packaging. Specify lead free by adding the +

symbol at the end of the part number when ordering. Lead free

not available for CERDIP package.

Pin Configurations

TOP VIEW

VBATT 1

16 RESET

VOUT 2

15 RESET

VCC 3

GND 4

MAX696

14 WDO

13 LLIN

BATT ON 5

12 N.C.

LOW LINE 6

11 WDI

OSC IN 7

10 PFO

OSC SEL 8

9 PFI

19-0829; Rev 5; 7/14

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