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µP Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset

Industry's-First µP Supervisory with Windowed Watchdog and Manual Reset

Product Details

Key Features

Parametric specs for Supervisors (1 Monitored Voltage)
Reset Thresh. (V) 2.5 to 3.3
3.3 to 5.5
Reset Thresh. Accur. (%) (@ +25°C) 1.5
Reset Out Active Low
Push-Pull
tRESET (min) 85ms to 300ms
Watchdog Feature Input/Output (WDI/WDO)
Windowed
Watchdog Timeout 1s to 2s
<1s
>2s
Adjustable
Supervisor Features Manual Reset
ICC (µA) (max) 45
Package/Pins SOT23/6
Budgetary
Price (See Notes)
2.18
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Simplified Block Diagram

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Parameters

Parametric specs for Supervisors (1 Monitored Voltage)
Reset Thresh. (V) 2.5 to 3.3
3.3 to 5.5
Reset Thresh. Accur. (%) (@ +25°C) 1.5
Reset Out Active Low
Push-Pull
tRESET (min) 85ms to 300ms
Watchdog Feature Input/Output (WDI/WDO)
Windowed
Watchdog Timeout 1s to 2s
<1s
>2s
Adjustable
Supervisor Features Manual Reset
ICC (µA) (max) 45
Package/Pins SOT23/6
Budgetary
Price (See Notes)
2.18

Key Features

  • Min/Max (Windowed) Watchdog, 8 Factory-Trimmed Timing Options
  • Pulsed Open-Drain, Active-Low Watchdog Output
  • Power-On Reset
  • Precision Monitoring of +2.5V, +3.0V, +3.3V, and +5.0V Power Supplies
  • Open-Drain or Push-Pull Active-Low RESET Outputs
  • Low-Power Operation (23µA typ)
  • Debounced Manual Reset Input
  • Guaranteed Reset Valid to VCC = +1.2V
  • AEC-Q100 Qualified MAX6324HUT44/V+T

Applications/Uses

  • Automotive
  • Embedded Control Systems
  • Industrial
  • Medical

Description

The MAX6323/MAX6324 microprocessor (µP) supervisory circuits monitor power supplies and µP activity in digital systems. A watchdog timer looks for activity outside an expected window of operation. Six laser-trimmed reset thresholds are available with ±2.5% accuracy from +2.32V to +4.63V. Valid active-low RESET output is guaranteed down to VCC = +1.2V.

The active-low RESET output is either push-pull (MAX6323) or open-drain (MAX6324). active-low RESET is asserted low when VCC falls below the reset threshold, or when the manual reset input (active-low MR) is asserted low. active-low RESET remains asserted for at least 100ms after VCC rises above the reset threshold and active-low MR is deasserted.

The watchdog pulse output (active-low WDPO) utilizes an open-drain configuration. It can be triggered either by a fast timeout fault (watchdog input pulses are too close to each other) or a slow timeout fault (no watchdog input pulse is observed within the timeout period). The watchdog timeout is measured from the last falling edge of watchdog input (WDI) with a minimum pulse width of 300ns. Active-low WDPO is asserted for 1ms when a fault is observed. Eight laser-trimmed timeout periods are available.

The MAX6323/MAX6324 are offered in a 6-pin SOT23 package and operate over the extended temperature range (-40°C to +125°C).

Simplified Block Diagram

MAX6323, MAX6324: Typical Operating Circuit MAX6323, MAX6324: Typical Operating Circuit Zoom icon

Technical Docs

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 .