MAX705

Low-Cost, µP Supervisory Circuits

Low-Cost Reset + Watchdog ICs


Please check latest availability status for a specific part variant.

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 active-low 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.

MAX705, MAX706, MAX707, MAX708, MAX813, MAX813L: Typical Operating Circuit MAX705, MAX706, MAX707, MAX708, MAX813, MAX813L: Typical Operating Circuit Enlarge+

Key Features

  • Supervisory-Function Integration Significantly Improves System Reliability While Reducing Board Space
    • µMAX Package
    • Guaranteed Active Low RESET Valid at VCC = 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

Applications/Uses

  • Computers
  • Controllers
  • Critical µP Power Monitoring
  • Intelligent Instruments

See parametric specs for Supervisors (1 Monitored Voltage) (252)


Part NumberReset Thresh.
(V)
Reset OuttRESETWatchdog FeatureWatchdog TimeoutSupervisor FeaturesReset Thresh. Accur.
(%)
ICC
(µA)
Package/PinsBudgetary
Price
min@ +25°CmaxSee Notes
MAX705 3.3 to 5.5
Active Low
Push-Pull
85ms to 300ms
Input (WDI)
Input/Output (WDI/WDO)
1s to 2s
Adjustable Reset Input
Manual Reset
Power Fail Comparator/Low Battery Detect
2.5350
CDIP/8
DICE SALES
PDIP/8
SOIC (N)/8
UMAX/8
$2.92 @1k
MAX706 
Active Low
Push-Pull
Input (WDI)
Input/Output (WDI/WDO)
1s to 2s
CDIP/8
DICE SALES/N
LCC/20
PDIP/8
SOIC (N)/8
UMAX/8
$1.91 @1k
MAX707 
Active High
Active Low
Push-Pull
No Watchdog-
CDIP/8
PDIP/8
SOIC (N)/8
UMAX/8
$2.11 @1k
MAX708 
Active High
Active Low
Push-Pull
No Watchdog-
CDIP/8
DICE SALES
LCC/20
PDIP/8
SOIC (N)/8
UMAX/8
$1.91 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
Product Reliability Reports: MAX705.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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