125nA nanoPower Supervisory Circuits with Capacitor-Adjustable Reset and Watchdog Timeouts

 

Part Number	Replacement	Explanation

Description

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The MAX16056–MAX16059 are ultra-low-current 125nA (typ) microprocessor (µP) supervisory circuits that monitor a single system supply voltage. These devices assert an active-low reset signal whenever the V_CC supply voltage drops below the factory trimmed reset threshold, manual reset is pulled low, or the watchdog timer runs out (MAX16056/MAX16058). The reset output remains asserted for an adjustable reset timeout period after V_CC rises above the reset threshold. Factory-trimmed reset threshold voltages are offered from 1.575V to 4.625V in approximately 100mV increments (see Table 1 in the full data sheet).

These devices feature adjustable reset and watchdog timeout using external capacitors. The MAX16056/MAX16058 contain a watchdog timer with a watchdog select input (WDS) that multiplies the watchdog timeout period by 128. The MAX16057/MAX16059 do not have the watchdog feature.

The MAX16056–MAX16059 are available in either push-pull or open-drain output-type configurations (see the Ordering Information in the full data sheet). These devices are fully specified over the -40°C to +125°C automotive temperature range. The MAX16056/MAX16058 are available in the 8-pin TDFN package, and the MAX16057/MAX16059 are available in the 6-pin TDFN package.

MAX16056, MAX16057, MAX16058, MAX16059: Typical Operating Circuit Enlarge+

Key Features

• Reduced Power Requirements
  • Ultra-Low 125nA (typ) Supply Current
  • 1.1V to 5.5V Operating Supply Range
• Configurable Circuit Enables Flexible Designs
  • Factory-Set Reset Threshold Options from 1.575V to 4.625V in Approximately 100mV Increments
  • Capacitor-Adjustable Reset Timeout
  • Capacitor-Adjustable Watchdog Timeout (MAX16056/MAX16058)
  • Watchdog Timer Capacitor Open Detect Function
  • Optional Watchdog Disable Function (MAX16056/MAX16058)
  • Manual-Reset Input
  • Push-Pull or Open-Drain Active-Low RESET Output Options
• Integrated Features Increases System Robustness
  • Power-Supply Transient Immunity
  • Guaranteed Active-Low RESET Valid for V_CC ≥ 1.1V
• Saves Board Space
  • 3mm x 3mm TDFN Package

Applications/Uses

• Glucose Monitors/Patient Monitors
• Metering/HVAC
• MP3 Players/Pagers
• PDAs/Cell Phones
• Portable/Battery-Powered Equipment