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MAX703

Low-Cost Microprocessor Supervisory Circuits with Battery Backup

Maxim Integrated 

MAX703/MAX704

Low-Cost Microprocessor Supervisory

Circuits with Battery Backup

General Description

The MAX703/MAX704 microprocessor (μP) supervisory

circuits reduce the complexity and number of components

required for power-supply monitoring and battery control

functions in μP systems. These devices significantly

improve system reliability and accuracy compared to that

obtained with separate ICs or discrete components.

The MAX703/MAX704 are available in 8-pin DIP and SO

packages and provide four functions:

1) An active-low reset during power-up, power-down, and

brownout conditions.

2) Battery-backup switching for CMOS RAM, CMOS μPs,

or other low-power logic circuitry.

3) A 1.25V threshold detector for power-fail warning,

low-battery detection, or for monitoring a power supply

other than +5V.

4) An active-low manual reset input.

The MAX703 and MAX704 differ only in their supplyvolt-

age monitor levels. The MAX703 generates a reset when

the supply drops below 4.65V, while the MAX704 gener-

ates a reset below 4.40V.

Applications

●● Computers

●● Controllers

●● Intelligent Instruments

●● Critical μP Power Monitoring

Typical Operating Circuit

UNREGULATED DC

REGULATED +5V

R1

0.1µF

VCC RESET

PFI

PFO

3.6V

LITHIUM

MAX703

R2 BATTERY

MAX704

VBATT

MR GND VOUT

PUSHBUTTON

SWITCH

MICROPROCESSOR

VCC

RESET

NMI

GND

BUS

VCC

CMOS RAM

GND

Features

●● Battery-Backup Power Switching

●● Precision Supply-Voltage Monitor

• 4.65V (MAX703)

• 4.40V (MAX704)

●● 200ms Reset Pulse Width

●● Debounced TTL/CMOS-Compatible Manual Reset

Input

●● 200μA Quiescent Current

●● 50nA Quiescent Current in Battery-Backup Mode

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

Warning

●● 8-Pin DIP and SO Packages

●● Guaranteed RESET Assertion to VCC = 1V

Ordering Information

PART

TEMP RANGE PIN-PACKAGE

MAX703C/D

0°C to +70°C

Dice*

MAX703CPA

0°C to +70°C

8 PDIP

MAX703CSA

0°C to +70°C

8 SO

MAX703EPA

-40°C to +85°C 8 PDIP

MAX703ESA

-40°C to +85°C 8 SO

MAX703MJA

-55°C to +125°C 8 CERDIP**

MAX704C/D

0°C to +70°C

Dice*

MAX704CPA

0°C to +70°C

8 PDIP

MAX704CSA

0°C to +70°C

8 SO

MAX704EPA

-40°C to +85°C 8 PDIP

MAX704ESA

-40°C to +85°C 8 SO

MAX704MJA

-55°C to +125°C 8 CERDIP**

*Dice are tested at TA = +25°C only.

**Contact factory for availability and processing to MIL-STD-883.

Devices in PDIP and SO packages are available in both leaded

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

the “+” symbol at the end of the part number when ordering.

Lead(Pb)-free not available for CERDIP package.

Pin Configuration

TOP VIEW

VOUT 1

VCC 2

GND 3

PFI 4

MAX703

MAX704

8 VBATT

7 RESET

6 MR

5 PFO

DIP/SO

19-0130; Rev 3; 5/14

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