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

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 VCC 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 VCC 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.

Applications

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

* 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 VCC ≥ 1.1V

* Saves Board Space

* 3mm x 3mm TDFN Package