Analog Devices Inc./Maxim Integrated MAX6887METE+

Overview

MAX6887METE+ from Maxim Integrated is a hex-voltage supervisory IC with six factory-configured undervoltage/overvoltage detector inputs, 1.6s normal and 102.4s initial watchdog timeout, ±1% threshold accuracy, 180–220ms reset timeout, and three active-low open-drain outputs (RESET, OV, WDO). It monitors 3.3V, 2.5V, 1.8V, and adjustable supply rails in multivoltage server power systems.

For engineers reviewing the MAX6887METE+ datasheet, MAX6887METE+ pinout, MAX6887METE+ application, or MAX6887METE+ equivalent, this page delivers verified electrical parameters, validated pin functions, confirmed thermal and timing behavior across –40°C to +85°C, and real-world substitution guidance for telecom and storage system design.

Technical Context

The MAX6887METE+ implements independent voltage detection per input with dual thresholds (UV/OV), internal hysteresis (0.3% V_TH), and temperature-stable reference (10 ppm/°C). Its virtual diode-OR power selection logic ensures operation from the highest of IN1–IN4 (≥2.7V) or VCC, with BP regulated at 2.55V for internal logic.

Watchdog functionality features two-phase timing: 102.4s initial timeout for µP initialization, then 1.6s normal timeout; WDO assertion triggers MR to generate system reset. Margin disable (MARGIN) overrides MR and holds all outputs in their current state during supply margining tests.

Key Specifications

Pinout & Package

MAX6887METE+ uses a 5mm × 5mm × 0.8mm, 16-pin thin QFN package with exposed pad (EP) internally connected to GND. The package supports high-density PCB layouts and efficient thermal dissipation in compact power systems.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6888METE+, the MAX6887METE+ provides two additional voltage detector inputs for expanded rail coverage, while TPS3808G33DBVR offers lower cost but sacrifices multi-rail supervision, overvoltage protection, and watchdog functionality essential for mission-critical infrastructure.

Availability

MAX6887METE+ is available at Aetrix Electronics and suitable for server power sequencing, telecom line card monitoring, and enterprise storage controller applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6887METE+ 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 power management, sensing, and interface applications in industrial, communications, and computing markets.

The MAX6887/MAX6888 product line delivers multivoltage supervisory circuits optimized for high-reliability, space-constrained systems requiring coordinated reset, overvoltage protection, and watchdog supervision across six independent supply rails.

FAQ

What are the factory-set undervoltage thresholds for MAX6887METE+ on IN1 through IN4?

The MAX6887METE+ has factory-set undervoltage thresholds of 2.880V (IN1), 2.190V (IN2), 1.580V (IN3), and 0.527V (IN4), corresponding to nominal 3.3V, 2.5V, 1.8V, and adjustable supply monitoring per Table 1 of the datasheet. These values are guaranteed within ±1% accuracy over –40°C to +85°C and enable direct integration into multirail server and storage power systems without external resistor networks.

How does the watchdog timer in MAX6887METE+ operate during system boot and runtime?

The MAX6887METE+ watchdog timer starts with a 102.4s initial timeout after power-up to accommodate µP initialization, then switches to a 1.6s normal timeout upon first WDI transition. If WDI fails to toggle within the active timeout period, WDO asserts low. When WDO is connected to MR, it triggers RESET for 200ms - clearing the watchdog and ensuring deterministic recovery from firmware stalls in both boot and runtime phases of the MAX6887METE+ application.

Can MAX6887METE+ monitor more than four supply voltages, and how are IN5 and IN6 configured?

Yes, MAX6887METE+ monitors six supply voltages using IN1–IN6. IN5 and IN6 are both factory-set to 0.527V UV / 0.673V OV thresholds, supporting adjustable rail monitoring via external resistor dividers. Each requires a 0.1µF bypass capacitor to GND for noise immunity. This six-input capability distinguishes MAX6887METE+ from quad-input alternatives like MAX6888METE+ and enables comprehensive supervision in dense power architectures without stacking supervisors.

What is the role of the MARGIN pin in MAX6887METE+, and how does it interact with MR?

The MARGIN pin in MAX6887METE+ holds RESET, OV, and WDO outputs in their current asserted or deasserted state during system-level voltage margining tests. When pulled low, it overrides MR even if MR is simultaneously asserted - ensuring stable output behavior while supply voltages are intentionally varied beyond nominal ranges. This function is critical for validating system robustness in MAX6887METE+ qualification testing without unintended resets.

Does MAX6887METE+ require external pullup resistors on its open-drain outputs, and what are the recommended values?

Yes, MAX6887METE+ requires external pullup resistors on RESET, OV, and WDO because all three are active-low open-drain outputs. Recommended values range from 10kΩ to 100kΩ depending on bus capacitance and rise-time requirements; 47kΩ is typical for 3.3V systems. Pullups must connect to the target logic voltage domain (e.g., 3.3V for µP reset input) and are mandatory for proper signal integrity and interoperability in MAX6887METE+ implementations.