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MAX813LCPA

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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 significantly 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-bar.

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.

Key Features Applications

µMAX Package: Smallest 8-Pin SO
Guaranteed RESET-bar Valid at V_CC = 1V
Precision Supply-Voltage Monitor

4.65V in MAX705/MAX707/MAX813L

4.40V in MAX706/MAX708

200ms Reset Pulse Width
Debounced TTL/CMOS-Compatible Manual-Reset Input
Independent Watchdog Timer-1.6sec Timeout (MAX705/MAX706)
Active-High Reset Output (MAX707/MAX708/MAX813L)
Voltage Monitor for Power-Fail or Low-Battery Warning

Automotive Electronics

Computers - Desktop, Workstation, Server

Controllers

Critical µP Monitoring

Intelligent Instruments

Key Specifications: Microprocessor Supervisors

Part Number

Number of Monitored Voltages

Reset Threshold Range (V)

Active-Low Reset Output

Active-High Reset Output

Min. Reset Timeout Range

Watchdog Feature

Nom. Watchdog Timeout Range

Supervisor Features

Reset Thresh. Acc. (% at +25°C)

Max. I_CC (µA)

Package

Package Type

Operating Temp. Range (°C)

MAX705

1 2

3.3 to 5.5

Push-Pull

85ms to 300ms

Input (WDI)
Input/Output (WDI/WDO)

1s to 2s

Adjustable Reset Input Manual Reset Power Fail Comparator/Low Line

2.5

350.0

8/PDIP
8/SOIC
8/uMAX

µMAX Plastic DIP SOIC

0 to +70 -40 to +125 -40 to +85 -55 to +125

MAX706

Push-Pull

Input (WDI)
Input/Output (WDI/WDO)

1s to 2s

2.5

8/PDIP
8/SOIC
8/uMAX

MAX707

Push-Pull

No Watchdog

2.5

8/PDIP
8/SOIC
8/uMAX

MAX708

Push-Pull

No Watchdog

2.5

8/PDIP
8/SOIC
8/uMAX

MAX813

Push-Pull

Input/Output (WDI/WDO)

1s to 2s

1.5

See Data Sheet

Application Notes

App Note 655: Supervisor ICs Monitor Battery-Powered Equipment - MAX706

Notes and Comments

Watchdog timer (MAX705,706,813)

Power-fail comparator (MAX705-8, 813)