General Description

The MAX6854/MAX6855/MAX6856/MAX6858/MAX6860–MAX6869 ultra-low-current (170nA, typ) microprocessor (µP) supervisory circuits combine voltage monitoring, watchdog timer, and manual reset input functions in a 5-pin SOT23 package. These devices assert a reset signal whenever the monitored voltage drops below the factorytrimmed reset threshold voltage, manual reset is asserted, or the watchdog timer expires. The reset output remains asserted for a minimum timeout period after VCC rises above the reset threshold and manual reset is deasserted. Factory-trimmed reset threshold voltages are offered from +1.575V to +4.625V in approximately 100mV increments (see Threshold Suffix Guide). Each device is offered with six minimum reset timeout options, ranging from 10ms to 1200ms.

Features

♦ Ultra-Low 170nA (typ) Supply Current

♦ Reset Thresholds from +1.575V to +4.625V in Approximately 100mV Increments

♦ Six Minimum Reset Timeout Period Options from 10ms to 1200ms

♦ Manual Reset Option

♦ Watchdog Timer Option

♦ Pin-Selectable 10ms/150ms (min) Reset Timeout Period (MAX6861/MAX6862/MAX6863)

♦ Immune to Short VCC Transients

♦ Guaranteed Reset Valid to VCC = +1.1V

♦ Three Reset Output Options:

Push-Pull RESET

Push-Pull RESET

Open-Drain RESET

♦ No External Components

♦ Small 5-Pin SOT23 Package

♦ Pin Compatible to the TPS3836/TPS3837/TPS3838 (MAX6861/MAX6862/MAX6863)

Applications

Portable/Battery-Powered Equipment

PDAs/Cell Phones

MP3 Players/Pagers

Glucose Monitors/Patient Monitors