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High-Accuracy µP Reset Circuit

µP Supervisor Provides the Highest Accuracy at 1%

Product Details

The MAX6394 low-power CMOS microprocessor (µP) supervisory circuit is designed to monitor power supplies in µP and digital systems. It offers excellent circuit reliability by providing 1% accurate thresholds over temperature and by eliminating external components and adjustments. The MAX6394 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. Active-low 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 MAX6394's open-drain active-low RESET output can be pulled up to a voltage higher than VCC.

The MAX6394 comes with factory-trimmed reset threshold voltages from 2.4V to 4.8V. Preset timeout periods of 0.7ms, 14ms, 105ms, and 826ms are also available. The device comes in a SOT143 package.

Key Features

  • ±0.6% Threshold Accuracy at TA = +25°C
  • ±1.0% Threshold Accuracy from -40°C to +125°C
  • Small SOT143 Package
  • Open-Drain Active-Low RESET Output Can Exceed VCC
  • Precision, Factory-Set VCC Reset Thresholds: Nine Options from 2.4V to 4.8V
  • Four Reset Timeout Periods Available: 0.7ms, 14ms, 105ms, and 826ms (minimum)
  • Immune to Short VCC Transients
  • 5µA Supply Current
  • AEC-Q100 Qualified, Refer to Ordering Information for Specific /V Part

Applications/Uses

  • Computers
  • Controllers
  • Critical µP and µC Power Monitoring
  • Intelligent Instruments
  • Portable/Battery-Powered Equipment
Parametric specs for Supervisors (1 Monitored Voltage)
Reset Thresh. (V) 1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Reset Thresh. Accur. (%) (@ +25°C) 0.6
Reset Out Active Low
Open Drain
tRESET (min) 1ms to 15ms
85ms to 300ms
300ms to 1s
<1ms
Watchdog Feature No Watchdog
Supervisor Features Manual Reset
ICC (µA) (max) 15
Package/Pins SOT23/4
Budgetary
Price (See Notes)
$1.78 @1k
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Simplified Block Diagram

MAX6394: Typical Operating Circuit MAX6394: Typical Operating Circuit Zoom icon

Technical Docs

Data Sheet High-Accuracy µP Reset Circuit Jan 22, 2020

Design & Development

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Parameters

Parametric specs for Supervisors (1 Monitored Voltage)
Reset Thresh. (V) 1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Reset Thresh. Accur. (%) (@ +25°C) 0.6
Reset Out Active Low
Open Drain
tRESET (min) 1ms to 15ms
85ms to 300ms
300ms to 1s
<1ms
Watchdog Feature No Watchdog
Supervisor Features Manual Reset
ICC (µA) (max) 15
Package/Pins SOT23/4
Budgetary
Price (See Notes)
$1.78 @1k

Key Features

  • ±0.6% Threshold Accuracy at TA = +25°C
  • ±1.0% Threshold Accuracy from -40°C to +125°C
  • Small SOT143 Package
  • Open-Drain Active-Low RESET Output Can Exceed VCC
  • Precision, Factory-Set VCC Reset Thresholds: Nine Options from 2.4V to 4.8V
  • Four Reset Timeout Periods Available: 0.7ms, 14ms, 105ms, and 826ms (minimum)
  • Immune to Short VCC Transients
  • 5µA Supply Current
  • AEC-Q100 Qualified, Refer to Ordering Information for Specific /V Part

Applications/Uses

  • Computers
  • Controllers
  • Critical µP and µC Power Monitoring
  • Intelligent Instruments
  • Portable/Battery-Powered Equipment

Description

The MAX6394 low-power CMOS microprocessor (µP) supervisory circuit is designed to monitor power supplies in µP and digital systems. It offers excellent circuit reliability by providing 1% accurate thresholds over temperature and by eliminating external components and adjustments. The MAX6394 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. Active-low 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 MAX6394's open-drain active-low RESET output can be pulled up to a voltage higher than VCC.

The MAX6394 comes with factory-trimmed reset threshold voltages from 2.4V to 4.8V. Preset timeout periods of 0.7ms, 14ms, 105ms, and 826ms are also available. The device comes in a SOT143 package.

Simplified Block Diagram

MAX6394: Typical Operating Circuit MAX6394: Typical Operating Circuit Zoom icon

Technical Docs

Data Sheet High-Accuracy µP Reset Circuit Jan 22, 2020

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal