µP Power Supply Monitor with Reset

Power Supply Monitor with Reset

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In applications with microprocessors (µPs) that have a RESET input, the MAX7705 is functionally and socket compatible with the TL7705, but requires no external components. It provides power-supply glitch immunity and a guaranteed power-up reset delay, while typically consuming 1/27th the power from a +5V supply.

The MAX7705 monitors the power supply in µP and digital systems. The RESET output is valid for VCC down to 1V. The device offers excellent circuit reliability and low cost by eliminating external components and adjustments.

A system reset is provided during power-up, power-down, and brownout conditions. When VCC is below the reset threshold, RESET is low and holds the µP in reset. RESET will go high 280ms after VCC rises above the reset threshold. The MAX7705 is available in 8-pin DIP and SO packages.
MAX7705: Typical Operating Circuit MAX7705: Typical Operating Circuit Enlarge+

Key Features

  • No External Components
  • Low Cost
  • Precise Reset Threshold
  • 280ms Power-On Reset Delay
  • 8-Pin DIP and SO Packages


  • Minimum Component Count Low-Cost Processor Systems

See parametric specs for Supervisors (1 Monitored Voltage) (250)

Part NumberReset Thresh.
Reset OuttRESETWatchdog FeatureICC
minmaxSee Notes
MAX7705 3.3 to 5.5
Active Low
85ms to 300msNo Watchdog150
SOIC (N)/8
$1.73 @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.

Additional Resources

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