Maxim Integrated MAX6439UTAGRD3 T

Description
The MAX6439-MAX6442 are a family of ultra-low-power battery monitors with integrated microprocessor (µP) supervisors. They offer single or dual low-battery output options to indicate battery status (OK, low, dead) and an independent µP supervisor that monitors Vcc and provides an active-low reset output. A manual reset function is available for resetting the µP with a push-button. No external components are required.
The devices are offered with several factory-trimmed low-battery threshold combinations ideal for single-cell lithium-ion (Li ) or multicell alkaline/NiCd/NiMH applications. When the battery voltage drops below a specified low threshold, the low-battery outputs are asserted to alert the system. When the voltage rises above the specified high threshold, the outputs are deasserted after a 150ms minimum timeout period, ensuring voltage stabilization before power circuitry activation or microprocessor reset timing.
The MAX6439/MAX6440 offer factory-trimmed battery monitors with a single output, while the MAX6441/MAX6442 offer factory-trimmed battery monitors with dual outputs. All battery monitors have open-drain low-battery outputs.
The MAX6439-MAX6442 monitor system voltages (Vcc) from 1.8V to 3.3V with seven fixed reset threshold options. Each device is offered with two minimum reset timeout periods of 150ms or 1200ms. The MAX6439/MAX6441 are offered with an open-drain RESET output, while the MAX6440/MAX6442 are offered with a push-pull RESET output.

Features
Factory-trimmed VBATT threshold options for monitoring single-cell Li or multicell alkaline/NiCd/NiMH applications
Immune to short battery voltage transients
Low current (2.5µA typ at 3.6V)
Single and dual low-battery output options
150ms minimum LBO timeout period
Independent µP reset with manual reset
Factory-set reset thresholds for monitoring Vcc from 1.8V to 3.3V
Available with 150ms (min) and 1.2s (min) Vcc reset timeout period options
-40°C to 85°C operating temperature range
Small 6- and 8-pin SOT23 packages
No external components required

Applications
Battery-powered systems (single-cell Li or two-/three-cell NiMH, NiCd, alkaline)
Cell phones/cordless phones
Portable medical devices
Electronic toys
Pagers
PDAs
MP3 players