Analog Devices Inc./Maxim Integrated MAX6887AETE+T

Overview

The MAX6887AETE+T from Maxim Integrated is a hex-voltage supervisory IC with six factory-set voltage-detector inputs (IN1–IN6), dual-threshold (undervoltage/overvoltage) monitoring, active-low open-drain RESET/OV/WDO outputs, 1% threshold accuracy, and integrated watchdog timer featuring 102.4s initial and 1.6s normal timeout periods. It operates from -40°C to +85°C in telecom power systems requiring multi-rail supply integrity verification.

For engineers reviewing the MAX6887AETE+T datasheet, MAX6887AETE+T pinout, MAX6887AETE+T application, or MAX6887AETE+T equivalent, key selection criteria include its six-input supervision capability, ±1% threshold tolerance across temperature, 200ms RESET timeout, 25µs OV pulse width, and compatibility with 5mm × 5mm thin QFN-EP packaging for high-density server board layouts.

Technical Context

The MAX6887AETE+T implements independent undervoltage and overvoltage comparators per input with hysteresis (0.3% V_TH) and 10 ppm/°C tempco. Its virtual diode-OR power architecture selects the highest of IN1–IN4 (≥2.7V) to internally generate VCC and BP (2.55V nominal), eliminating need for external bias.

Watchdog logic distinguishes initial boot (102.4s timeout) from runtime (1.6s timeout); WDI edge detection resets the timer, while WDO assertion can be fed back to MR to trigger system reset. Margin disable (MARGIN) overrides all monitoring functions to hold outputs during system-level stress testing.

Key Specifications

Pinout & Package

Package: 16-pin thin QFN-EP (5mm × 5mm × 0.8mm) with exposed pad thermally and electrically connected to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6888AETE+T, the MAX6887AETE+T adds two extra voltage inputs (IN5/IN6) for expanded rail coverage without changing timing, accuracy, or package-making it optimal for complex systems. Versus TPS3808G33DBVR, it delivers integrated hex supervision, dual-threshold detection, and watchdog functionality in one device, significantly reducing system-level component count and debug complexity.

Availability

MAX6887AETE+T is available at Aetrix Electronics and suitable for telecom infrastructure, server motherboard, and network switch applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6887AETE+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 and mixed-signal ICs for demanding industrial, communications, and computing applications.

The MAX6887/MAX6888 product line delivers multivoltage supervisory solutions with integrated watchdog and margining for high-reliability power management in telecom, server, and networking equipment.

FAQ

What are the factory-set undervoltage and overvoltage thresholds for MAX6887AETE+T?

The MAX6887AETE+T has fixed thresholds per input: IN1 = 4.620V UV / 5.360V OV; IN2 = 3.060V UV / 3.540V OV; IN3 = 2.310V UV / 2.680V OV; IN4 = 1.670V UV / 1.930V OV; IN5/IN6 = 0.557V UV / 0.643V OV. These values are specified in Table 1 of the MAX6887 datasheet and are guaranteed over temperature with ±1% accuracy.

Can MAX6887AETE+T be powered from a single supply rail?

Yes - the MAX6887AETE+T uses a virtual diode-OR architecture that automatically selects the highest valid voltage among IN1–IN4 (≥2.7V) to power its internal circuitry. No external VCC supply is required unless all monitored inputs are configured as adjustable ('Adj'), in which case VCC must be externally supplied ≥200mV above the highest IN_ voltage.

How does the watchdog timer in MAX6887AETE+T differentiate between boot and runtime modes?

The MAX6887AETE+T implements two distinct watchdog timeout periods: an initial timeout of 102.4s (92.16–112.64s) triggered immediately after power-up or reset, followed by a shorter normal timeout of 1.6s (1.44–1.76s) after the first WDI transition. This ensures safe processor initialization before enforcing strict runtime fault detection.

What is the purpose of the MARGIN pin on MAX6887AETE+T?

The MARGIN pin on MAX6887AETE+T disables all monitoring functions (UV/OV detection, watchdog) when pulled low, holding RESET, OV, and WDO outputs in their current state. This enables controlled voltage margining tests without triggering unintended resets - a critical feature for production validation of power supply robustness.

Does MAX6887AETE+T require external pullup resistors on its open-drain outputs?

Yes - all three outputs (RESET, OV, WDO) are active-low open-drain and require external pullup resistors to the appropriate logic supply (e.g., 3.3V or 5V). Typical values range from 4.7kΩ to 10kΩ; the device specifies VOL ≤0.4V at ISINK = 4mA, ensuring solid logic-low assertion under load.