Analog Devices Inc./Maxim Integrated MAX6887BETE+

Overview

The MAX6887BETE+ from Maxim Integrated is a hex-voltage supervisory IC with six factory-set voltage-detector inputs (IN1–IN6), undervoltage/overvoltage monitoring, 1% threshold accuracy, 180ms reset timeout, and integrated watchdog timer with 102.4s initial / 1.6s normal timeout periods. It serves as a multivoltage system monitor in telecom and server power management.

For engineers reviewing the MAX6887BETE+ datasheet, MAX6887BETE+ pinout, MAX6887BETE+ application, or MAX6887BETE+ equivalent, key selection criteria include its six-input supervision capability, adjustable thresholds on IN4–IN6, open-drain active-low RESET/OV/WDO outputs, and operation across –40°C to +85°C in a 16-pin thin QFN package.

Technical Context

The MAX6887BETE+ implements independent undervoltage and overvoltage detection per input using precision reference circuitry with ±1.5% total threshold accuracy over temperature. Its logic array monitors all six inputs simultaneously and asserts RESET when any input falls below its UV threshold (e.g., IN1 = 4.62V, IN2 = 3.06V, IN3 = 2.31V, IN4–IN6 = 0.557V) or MR is pulled low.

It integrates a dual-mode watchdog timer with initial timeout (102.4s) for µP initialization and normal timeout (1.6s) for runtime monitoring; WDO assertion triggers RESET when connected to MR. All three outputs-RESET, OV, and WDO-are active-low, open-drain, requiring external pullups and supporting 4mA sink capability at 0.4V max VOL.

Key Specifications

Pinout & Package

MAX6887BETE+ 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.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6888BETE+, the MAX6887BETE+ adds two adjustable detector inputs for flexible rail coverage, while TPS3808G33DBVR offers lower unit cost but demands significant design effort to replicate six-rail supervision, watchdog, and margining functions.

Availability

MAX6887BETE+ is available at Aetrix Electronics and suitable for telecom infrastructure, server power management, and industrial networking applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6887BETE+ 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, sensing, connectivity, and security applications.

The MAX6887/MAX6888 product line delivers multivoltage supervisory solutions optimized for high-reliability computing, communications, and storage systems requiring coordinated reset, overvoltage protection, and watchdog safety monitoring.

FAQ

What are the factory-set undervoltage thresholds for MAX6887BETE+?

The MAX6887BETE+ has factory-set undervoltage thresholds of 4.62V on IN1, 3.06V on IN2, 2.31V on IN3, and 0.557V on IN4–IN6. These values are specified in Table 1 of the datasheet and maintain ±1.5% accuracy over –40°C to +85°C. The MAX6887BETE+ uses these precise thresholds to detect supply sags before downstream logic malfunctions.

How does the watchdog timer operate in MAX6887BETE+?

The MAX6887BETE+ watchdog timer features an initial timeout of 102.4s for µP initialization, followed by a normal timeout of 1.6s for runtime supervision. WDI must be toggled within each period to prevent WDO assertion. When WDO is connected to MR, it triggers a full RESET sequence with 180ms hold time, enabling automatic recovery from firmware stalls without external intervention.

Can MAX6887BETE+ monitor adjustable voltage rails?

Yes, MAX6887BETE+ supports adjustable thresholds on IN4, IN5, and IN6 using external resistor dividers. With factory-set UV/OV points of 0.557V/0.643V on these pins, users can scale higher voltages (≥0.6V) into range. The device's 130–300kΩ input impedance minimizes divider current draw while maintaining noise immunity through 0.1µF local bypassing.

What is the role of the MARGIN pin on MAX6887BETE+?

The MARGIN pin on MAX6887BETE+ freezes the state of RESET, OV, and WDO outputs during system-level stress testing. When pulled low, it overrides MR and holds outputs steady even if monitored supplies exceed UV/OV thresholds - enabling safe validation of board behavior under intentional over/undervoltage conditions without unintended resets.

Does MAX6887BETE+ require external pullup resistors on its outputs?

Yes, MAX6887BETE+ requires external pullup resistors on RESET, OV, and WDO because all three are active-low open-drain outputs. A typical 10kΩ pullup to 3.3V or 5V ensures proper logic levels and supports wired-OR configurations. The outputs sink up to 4mA at ≤0.4V, allowing robust interfacing with standard CMOS inputs and fault-aggregation buses.