Analog Devices Inc./Maxim Integrated MAX6887QETE+T

Overview

MAX6887QETE+T from Maxim Integrated is a hex-voltage supervisory IC with six adjustable 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 operates from -40°C to +85°C in multivoltage server power systems.

For engineers reviewing the MAX6887QETE+T datasheet, MAX6887QETE+T pinout, MAX6887QETE+T application, or MAX6887QETE+T equivalent, key selection criteria include its six fully adjustable input thresholds (0.557V UV / 0.643V OV), 200ms reset timeout, 16-pin thin QFN package, and margin-disable capability for system-level testing under out-of-spec conditions.

Technical Context

The MAX6887QETE+T implements six independent voltage detectors-each with factory-trimmed undervoltage (0.557V) and overvoltage (0.643V) thresholds-and a dual-phase watchdog timer with distinct initial (102.4s) and normal (1.6s) timeout periods. All inputs are adjustable via external resistor dividers, enabling monitoring of any supply >0.6V.

Its power architecture uses virtual diode-ORing across IN1–IN4 or VCC to select the highest available supply (≥2.7V required), while BP provides a regulated +2.55V internal logic rail. RESET, OV, and WDO are open-drain outputs requiring external pullups and feature fixed timeout durations (200ms, 25µs, and watchdog-driven assertion).

Key Specifications

Pinout & Package

MAX6887QETE+T is housed in 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.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6888QETE+T, the MAX6887QETE+T adds two extra voltage-monitoring channels and retains identical timing, accuracy, and package-making it optimal for complex multirail systems. Versus TPS3808G33DBVR, it delivers comprehensive six-rail supervision with integrated watchdog and margin control-justifying its use in mission-critical infrastructure.

Availability

MAX6887QETE+T is available at Aetrix Electronics and suitable for telecom infrastructure, server power sequencing, and industrial storage controller designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6887QETE+T 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, mixed-signal, and power-management ICs for high-reliability industrial, communications, and computing applications.

The MAX6887/MAX6888 family was engineered specifically for multivoltage system supervision in servers, telecom equipment, and networking hardware-emphasizing adjustability, timing precision, and robust fault handling.

FAQ

What are the exact undervoltage and overvoltage thresholds for MAX6887QETE+T?

The MAX6887QETE+T features factory-set thresholds of 0.557V for undervoltage detection and 0.643V for overvoltage detection on all six inputs (IN1–IN6). These values are specified with ±1% accuracy across the full -40°C to +85°C operating temperature range and apply uniformly to each adjustable input channel.

How does the watchdog timer operate in MAX6887QETE+T?

The MAX6887QETE+T watchdog timer has two distinct modes: an initial timeout of 102.4s (for µP boot sequences) and a normal timeout of 1.6s (for runtime supervision). WDO asserts low if WDI fails to toggle within the active timeout period. Connecting WDO to MR causes automatic reset assertion upon timeout-ensuring recovery from software hangs.

Can MAX6887QETE+T be powered from a dedicated supply rail?

Yes-MAX6887QETE+T can be powered either through any of IN1–IN4 (≥2.7V) or via the VCC pin. When using VCC, it must be ≥200mV higher than any applied IN_ voltage and brought up first. Internally, VCC equals the highest of IN1–IN4, and BP provides a regulated +2.55V rail for internal logic-not for external loads.

What is the function of the MARGIN pin on MAX6887QETE+T?

The MARGIN pin on MAX6887QETE+T disables real-time response to voltage faults and watchdog expiry: when pulled low, it holds RESET, OV, and WDO in their current asserted or deasserted states. This enables controlled system-level stress testing-even when monitored supplies exceed 0.557V/0.643V thresholds-without triggering unintended resets.

Does MAX6887QETE+T require external pullup resistors on its outputs?

Yes-MAX6887QETE+T's RESET, OV, and WDO outputs are active-low open-drain drivers and require external pullup resistors to the appropriate logic rail (e.g., 3.3V or 1.8V). Typical values range from 4.7kΩ to 10kΩ; pullups ensure proper logic-level translation and wired-OR capability in multi-source reset architectures.