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MAX6749：µP Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay

The MAX6746–MAX6753 low-power microprocessor (µP) supervisory circuits monitor single/dual system supply voltages from 1.575V to 5V and provide maximum adjustability for reset and watchdog functions. These devices assert a reset signal whenever the VCC supply voltage or RESET IN falls below its reset threshold or when manual reset is pulled low. The reset output remains asserted for the reset timeout period after VCC and RESET IN rise above the reset threshold. The reset function features immunity to power-supply transients. The MAX6746–MAX6753 have ±2% factory-trimmed reset threshold voltages in approximately 100mV increments from 1.575V to 5.0V and/or adjustable reset threshold voltages using external resistors. The reset and watchdog delays are adjustable with external capacitors. The MAX6746–MAX6751 contain a watchdog select input that extends the watchdog timeout period by 128x. The MAX6752/MAX6753 contain a window watchdog timer that looks for activity outside an expected window of operation. The MAX6746–MAX6753 are available with a push-pull or open-drain active-low RESET output. The MAX6746–MAX6753 are available in an 8-pin SOT23 package and are fully specified over the automotive temperature range (-40°C to +125°C).

Key Features Reset and Watchdog Options EnablesWide Variety of Applications Factory-Set Reset Threshold Options from 1.575V to 5V in ～ 100mV Increments Adjustable Reset Threshold Options Single/Dual Voltage Monitoring Capacitor-Adjustable Reset Timeout Capacitor-Adjustable Watchdog Timeout Min/Max (Windowed) Watchdog Option Manual-Reset Input Option Push-Pull or Open-Drain Active-Low RESET Output Options 3.7µA Supply Current Reduces System Power Consumption Integrated Power Supply Protection Increases Robustness Power-Supply Transient Immunity Guaranteed Active-Low RESET Valid for VCC ≥ 1V 8-Pin SOT23 Packages Saves Board Space

MAX6746, MAX6747, MAX6748, MAX6749, MAX6750, MAX6751: Typical Operating Circuit Applications/Uses Automotive Battery-Powered Computers/Controllers Computers Critical µP Monitoring Embedded Controllers Intelligent Instruments Medical Equipment Portable Equipment Set-Top Boxes

DataSheet

Parametrics

Quality and Environmental Data

• MAX6749.pdf

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