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MAX6323：µP Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset

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

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).

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

MAX6323, MAX6324: Typical Operating Circuit Applications/Uses Automotive Embedded Control Systems Industrial Medical

DataSheet

Parametrics

Quality and Environmental Data

• MAX6323.pdf

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