Analog Devices Inc./Maxim Integrated MAX6887KETE+

Overview

MAX6887KETE+ from Maxim Integrated is a hex-voltage supervisory IC with six factory-configured 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 5.0V, 3.3V, 1.8V, and three adjustable supplies in telecom power systems.

For engineers reviewing the MAX6887KETE+ datasheet, MAX6887KETE+ pinout, MAX6887KETE+ application, or MAX6887KETE+ equivalent, this page delivers verified specifications, exact pin functions, real-world multivoltage monitoring use cases, and two validated alternative parts for supply chain continuity and design flexibility.

Technical Context

The MAX6887KETE+ implements six independent voltage detectors-each with matched undervoltage and overvoltage thresholds-with ±1.5% accuracy over −40°C to +85°C. Its virtual diode-OR power architecture selects the highest of IN1–IN4 (≥2.7V) to self-power internal circuitry, eliminating need for external VCC bias in most configurations.

It integrates a configurable watchdog timer with separate initial (102.4s) and normal (1.6s) timeout periods, where WDO assertion can be routed to MR to trigger system reset. All three outputs (RESET, OV, WDO) are active-low open-drain with 0.4V max VOL at 4mA sink, requiring external pullups.

Key Specifications

Pinout & Package

MAX6887KETE+ 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 multilayer boards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6887METE+, MAX6887KETE+ offers identical electrical behavior and drop-in compatibility; versus TPS3808G33DBVR, it delivers six-rail supervision, overvoltage detection, and integrated watchdog - enabling consolidation of three discrete supervisors into one compact QFN.

Availability

MAX6887KETE+ is available at Aetrix Electronics and suitable for telecom infrastructure, server power management, and network equipment requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.

Supply support for MAX6887KETE+ 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 family targets high-reliability multivoltage power supervision in telecom, server, and networking systems - delivering integrated voltage monitoring, watchdog safety, and reset control in a single compact package.

FAQ

What are the factory-set undervoltage thresholds for MAX6887KETE+?

The MAX6887KETE+ has factory-set undervoltage thresholds of 4.380V (IN1), 2.880V (IN2), 1.580V (IN3), 0.527V (IN4), and 0.557V (IN5/IN6). These values are specified in Table 1 of the datasheet and enable direct monitoring of 5.0V, 3.3V, and 1.8V rails without external resistors. The MAX6887KETE+ achieves ±1.5% accuracy across −40°C to +85°C.

Does MAX6887KETE+ require an external power supply, or can it self-power?

The MAX6887KETE+ self-powers from the highest voltage present on IN1–IN4 (≥2.7V), eliminating need for an external VCC supply in most applications. Its internal virtual diode-OR circuit automatically selects the active input; VCC is derived internally and must not be used to power external circuitry. A 1µF ceramic capacitor is required between VCC and GND.

How does the watchdog timer in MAX6887KETE+ operate during system boot?

The MAX6887KETE+ watchdog timer starts with a 102.4s initial timeout period immediately after power-up, allowing ample time for microprocessor initialization. After the first WDI transition, it switches to the 1.6s normal timeout mode. This dual-mode behavior prevents false resets during boot while maintaining tight runtime supervision - no firmware configuration is needed.

Can MAX6887KETE+ monitor overvoltage conditions, and how is OV output used?

Yes, MAX6887KETE+ provides independent overvoltage detection on all six inputs, with factory-set thresholds such as 5.620V (IN1) and 3.700V (IN2). The active-low OV output asserts within 25µs of overvoltage detection and remains low for 25µs after all inputs return to safe levels. OV can be connected to MR to force a system reset during overvoltage faults.

What is the role of the MARGIN pin on MAX6887KETE+?

The MARGIN pin on MAX6887KETE+ disables automatic RESET/OV/WDO assertion during system-level functional testing - for example, when intentionally stressing power rails beyond nominal limits. When pulled low, it freezes output states regardless of input voltage or watchdog status. MARGIN overrides MR if both are asserted, and is internally pulled up to BP via a 10µA current source.