68HC11/Bidirectional-Compatible µP Reset Circuit

Industry's Only Motorola 68HCxx/Bidirectional-Compatible SOT Reset IC

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The MAX6314 low-power CMOS microprocessor (µP) supervisory circuit is designed to monitor power supplies in µP and digital systems. The MAX6314's active-low RESET output is bidirectional, allowing it to be directly connected to µPs with bidirectional reset inputs, such as the 68HC11. It provides excellent circuit reliability and low cost by eliminating external components and adjustments. The MAX6314 also provides a debounced manual reset input.

This device performs a single function: it asserts a reset signal whenever the VCC supply voltage falls below a preset threshold or whenever manual reset is asserted. Reset remains asserted for an internally programmed interval (reset timeout period) after VCC has risen above the reset threshold or manual reset is deasserted.

The MAX6314 comes with factory-trimmed reset threshold voltages in 100mV increments from 2.5V to 5V. Preset timeout periods of 1ms, 20ms, 140ms, and 1120ms (minimum) are also available. The device comes in a SOT143 package.

For a µP supervisor with an open-drain reset pin, see the MAX6315 data sheet.
MAX6314: Typical Operating Circuit MAX6314: Typical Operating Circuit Enlarge+

Key Features

  • Small SOT143 Package
  • Active-Low RESET Output Simplifies Interface to Bidirectional Reset I/Os
  • Precision Factory-Set VCC Reset Thresholds:
    • 100mV Increments from 2.5V to 5V
  • ±1.8% Reset Threshold Accuracy at TA = +25°C
  • ±2.5% Reset Threshold Accuracy over temp.
  • Four Reset Timeout Periods Available:
    • 1ms, 20ms, 140ms, or 1120ms (minimum)
  • Immune to Short VCC Transients
  • 5µA Supply Current
  • Pin-Compatible with MAX811


  • Computers: Desktop, Workstation, Server
  • Controllers
  • Critical µP and µC Power Monitoring
  • Intelligent Instruments
  • Portable Battery-Powered Equipment

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

Part NumberReset Thresh.
Reset OuttRESETWatchdog FeatureSupervisor FeaturesReset Thresh. Accur.
min@ +25°CmaxSee Notes
2.5 to 3.3
3.3 to 5.5
Active Low
1ms to 15ms
15ms to 85ms
85ms to 300ms
No WatchdogManual Reset1.812
$1.41 @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.

Technical Documents

Tutorial 939 Choosing Supervisor Outputs
Product Reliability Reports: MAX6314.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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Related Resources

Type ID Title
Tutorial 939 Choosing Supervisor Outputs