Analog Devices Inc./Maxim Integrated MAX6887OETE+

Overview

MAX6887OETE+ from Maxim Integrated is a hex-voltage supervisory IC with six factory-set undervoltage/overvoltage detector inputs, active-low open-drain RESET/OV/WDO outputs, 1% threshold accuracy, and dual-mode watchdog timer (102.4s initial / 1.6s normal timeout). It monitors multivoltage rails in telecom and server power systems and operates from -40°C to +85°C.

For engineers reviewing the MAX6887OETE+ datasheet, MAX6887OETE+ pinout, MAX6887OETE+ application, or MAX6887OETE+ equivalent, key selection criteria include its 3.3V/2.5V fixed IN1–IN2 thresholds with adjustable IN3–IN4 (0.527V UV / 0.673V OV), 200ms RESET timeout, 16-pin thin QFN package, and margin disable functionality for system-level testing.

Technical Context

The MAX6887OETE+ implements six independent voltage detectors with ±1% threshold accuracy over temperature, each monitoring both undervoltage and overvoltage conditions using internal reference-based comparators. Its virtual diode-OR power architecture selects the highest of IN1–IN4 (≥2.7V) to supply internal circuitry, with VCC internally derived and BP regulated at 2.55V.

It integrates a configurable watchdog timer with separate initial (102.4s) and normal (1.6s) timeout periods, triggered by WDI edge transitions. RESET asserts on any UV condition or MR low, remains active for 200ms after fault clearance, and supports WDO-to-MR reset chaining. All three outputs (RESET/OV/WDO) are open-drain with 0.4V VOL at 4mA sink.

Key Specifications

Pinout & Package

MAX6887OETE+ uses a 5mm × 5mm × 0.8mm, 16-pin thin QFN package with exposed pad (EP) connected to GND. The package is RoHS-compliant and optimized for high-density PCB layouts with thermal efficiency.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar power-supply supervisory applications.

Compared with MAX6888OETE+, the MAX6887OETE+ adds two extra voltage detector channels (IN5/IN6) for expanded rail coverage without changing package or footprint; versus TPS3808G33DBVR, it delivers full-system supervision with OV protection, watchdog, and margining-critical for telecom and server reliability.

Availability

MAX6887OETE+ is available at Aetrix Electronics and suitable for telecom infrastructure, server motherboard design, and network switch development requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6887OETE+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for demanding industrial, communications, and computing applications.

The MAX6887/MAX6888 family was engineered specifically for multivoltage system supervision in high-reliability telecom and data center equipment, integrating voltage detection, watchdog, and margining in a single compact package.

FAQ

What are the factory-set undervoltage thresholds for MAX6887OETE+ on IN1 and IN2?

The MAX6887OETE+ has factory-set undervoltage thresholds of 2.880V on IN1 (for 3.3V rail monitoring) and 2.190V on IN2 (for 2.5V rail monitoring), both with ±10% tolerance as specified in Table 1 of the datasheet. These values are laser-trimmed during production and do not require external configuration.

Can MAX6887OETE+ monitor sub-1V supplies like 0.85V or 0.9V?

Yes - MAX6887OETE+ supports adjustable thresholds on IN3–IN6 with nominal undervoltage threshold of 0.527V. Using an external resistor divider, it can accurately monitor supplies as low as 0.6V. The equation VMON = 0.6 × (R1 + R2)/R2 defines the monitored voltage, enabling precise setup for 0.85V or 0.9V rails.

How does the watchdog timer behave during power-up of MAX6887OETE+?

At power-up, MAX6887OETE+ enters initial watchdog mode with 102.4s timeout (tWDI), allowing ample time for microprocessor initialization. After WDO goes high, the first WDI edge triggers transition to normal 1.6s timeout (tWD). If no WDI transition occurs within tWDI, WDO asserts and remains low until next WDI edge.

Is an external pullup resistor required for the RESET output of MAX6887OETE+?

Yes - RESET is an open-drain output and requires an external pullup resistor to the target logic supply (e.g., 3.3V or 5V). Typical values range from 4.7kΩ to 10kΩ. Without pullup, RESET cannot drive high-impedance logic inputs or interface with standard microcontroller reset pins.

What is the purpose of the MARGIN input on MAX6887OETE+ and how is it used?

The MARGIN input on MAX6887OETE+ freezes RESET, OV, and WDO outputs in their current state during system-level stress testing. When pulled low, it overrides MR and holds outputs steady even if monitored voltages exceed thresholds - enabling safe validation of overvoltage/undervoltage margins without unintended resets.