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General Description

The MAX705–MAX708/MAX813L microprocessor (µP)

supervisory circuits reduce the complexity and number of

components required to monitor power-supply and battery

functions in µP systems. These devices signicantly improve

system reliability and accuracy compared to separate ICs or

discrete components.

The MAX705/MAX706/MAX813L provide four functions:

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

brownout conditions.

2) An independent watchdog output that goes low if

the watchdog input has not been toggled within 1.6

seconds.

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 MAX707/MAX708 are the same as the MAX705/

MAX706, except an active-high reset is substituted for

the watchdog timer. The MAX813L is the same as the

MAX705, except RESET is provided instead of RESET.

Two supply-voltage monitor levels are available: The

MAX705/MAX707/MAX813L generate a reset pulse when

the supply voltage drops below 4.65V, while the MAX706/

MAX708 generate a reset pulse below 4.40V. All four parts

are available in 8-pin DIP, SO, and µMAX

packages.

Applications

● Computers

● Controllers

● Intelligent Instruments

● Critical μP Power Monitoring

Benets and Features

● Supervisory-Function Integration Significantly

Improves System Reliability While Reducing Board

Space

• μMAX Package

• Guaranteed RESET Valid at V

= 1V

- 200ms Reset Pulse Width

- Debounced TTL/CMOS-Compatible Manual-

Reset Input

- Active-High Reset Output (MAX707/MAX708/

MAX813L)

• Precision-Supply Voltage Monitor

- 4.65V (MAX705/MAX707/MAX813L)

- 4.40V (MAX706/MAX708)

• Voltage Monitor for Power-Fail or Low-Battery

Warning

19-4334; Rev. 10; 4/15

µMAX is a registered trademark of Maxim Integrated Products, Inc.

*Dice are specified at T

= +25°C.

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

Devices in PDIP, SO, and μMAX packages are available in both

leaded and lead(Pb)-free/RoHS-compliant packaging. Specify

lead-free by adding the + symbol at the endof the part number

when ordering.

Lead-free packaging is not available for CERDIP packages.

PART TEMP RANGE PIN-PACKAGE

MAX705CPA 0°C to +70°C 8 Plastic DIP

MAX705CSA 0°C to +70°C 8 SO

MAX705CUA 0°C to +70°C 8 μMAX

MAX705C/D 0°C to +70°C Dice*

Pin Configurations appear at end of data sheet.

Ordering Information continued at end of data sheet.

PFI

PFO

WDO

RESET

UNREGULATED DC

PUSHBUTTON

SWITCH

PFI

I/O LINE

INTERRUPT

µP

MAX705

MAX706

MAX813L

MAX667

+5V DC LINEAR

REGULATOR

RESET

NMI

MAX705–MAX708/MAX813L Low-Cost, μP Supervisory Circuits

Typical Operating Circuit

Ordering Information

Terminal Voltage (with respect to GND)

..................................................................... -0.3V to 6.0V

All Other Inputs (Note 1) ..................... -0.3V to (V

+ 0.3V)

Input Current

................................................................................. 20mA

GND ...............................................................................20mA

Output Current (all outputs) ................................................20mA

Continuous Power Dissipation (T

= +70°C)

Plastic DIP (derate 9.09mW/°C above +70°C) ............727mW

SO (derate 5.88mW/°C above +70°C) ........................471mW

μMAX (derate 4.10mW/°C above +70°C) ...................330mW

CERDIP (derate 8.00mW/°C above +70°C) ................640mW

Operating Temperature Ranges

MAX70_C__, MAX813LC__ ...............................0°C to +70°C

MAX70_E__, MAX813LE__ .......................... -40°C to +85°C

MAX70_MJA ................................................. -55°C to +125°C

Storage Temperature Range ............................ -65°C to +160°C

Lead Temperature (soldering, 10s) .................................+300°C

Soldering Temperature (reflow)

Lead(Pb)-free...............................................................+260°C

Containing Lead(Pb) ....................................................+240°C

= 4.75V to 5.5V for MAX705/MAX707/MAX813L, V

= 4.5V to 5.5V for MAX706/MAX708, T

= T

MIN

to T

MAX

, unless otherwise

noted.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Operating Voltage Range V

MAX70_C 1.0 5.5

VMAX813LC 1.1 5.5

MAX70_E/M, MAX813LE/M 1.2 5.5

Supply Current I

SUPPLY

MAX705C, MAX706C, MAX813LC 150 350

µA

MAX705E/M, MAX706E/M, MAX813LE/M 150 500

MAX707C, MAX708C 50 350

MAX707E/M, MAX708E/M 50 500

Reset Threshold (Note 2) V

MAX705, MAX707, MAX813L 4.50 4.65 4.75

MAX706, MAX708 4.25 4.40 4.50

Reset Threshold Hysteresis (Note 2) 40 mV

Reset Pulse Width (Note 2) t

140 200 280 ms

RESET Output Voltage

SOURCE

= 800μA V

- 1.5

SINK

= 3.2mA 0.4

MAX70_C, V

= 1V, I

SINK

= 50μA 0.3

MAX70_E/M, V

= 1.2V, I

SINK

= 100μA 0.3

RESET Output Voltage

MAX707, MAX708, I

SOURCE

= 800μA V

- 1.5

MAX707, MAX708, I

SINK

= 1.2mA 0.4

MAX813LC, I

SOURCE

= 4μA, V

= 1.1V 0.8

MAX813LE/M, I

SOURCE

= 4μA, V

= 1.2V 0.9

MAX813L

SOURCE

= 800μA V

- 1.5

SINK

= 3.2mA 0.4

MAX705–MAX708/MAX813L MAX705–MAX708/MAX813L

Low-Cost, μP Supervisory Circuits

www.maximintegrated.com

Maxim Integrated

│

Note 1: The input-voltage limits on PFI and MR can be exceeded if the input current is less than 10mA.

Absolute Maximum Ratings

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these

or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect

device reliability.

Electrical Characteristics