Analog Devices Inc./Maxim Integrated MAX6888DETE+

Overview

MAX6888DETE+ from Maxim Integrated is a quad-voltage, overvoltage/undervoltage supervisory IC with integrated watchdog timer, three open-drain outputs (RESET, OV, WDO), and factory-set thresholds for 3.3V, 2.5V, 1.8V, and 1.5V supplies. It operates from -40°C to +85°C in a 16-pin thin QFN package and delivers 1% threshold accuracy, 200ms reset timeout, and dual-mode watchdog (102.4s initial / 1.6s normal).

For engineers reviewing the MAX6888DETE+ datasheet, MAX6888DETE+ pinout, MAX6888DETE+ application, or MAX6888DETE+ equivalent, this page provides verified functional identity, confirmed pin roles, exact voltage thresholds (3.06V UV / 3.54V OV on IN1, 2.31V UV / 2.68V OV on IN2, etc.), watchdog timing behavior, and real-world multivoltage system integration guidance.

Technical Context

The MAX6888DETE+ implements four independent voltage detectors-each with matched undervoltage and overvoltage thresholds-and a configurable watchdog timer with distinct initial (102.4s) and normal (1.6s) timeout periods. Its virtual diode-OR power architecture selects the highest of IN1–IN4 (≥2.7V) to supply internal circuitry, eliminating need for external VCC biasing.

All outputs (RESET, OV, WDO) are active-low, open-drain with 0.4V max VOL at 4mA sink, and feature built-in timing blocks: RESET asserts for 200ms after fault clearance, OV deasserts after 25µs, and WDO responds to WDI edge transitions with glitch rejection (100ns) and 1µs minimum MR pulse width.

Key Specifications

Pinout & Package

MAX6888DETE+ uses a 16-pin thin QFN package (5mm × 5mm × 0.8mm) with exposed paddle connected to GND. The device has no internal connections on pins 11 and 12 (N.C.), and pin 8 is an internal connection (I.C.) left unconnected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6887DETE+, the MAX6888DETE+ reduces pin count complexity and cost while retaining identical per-rail accuracy and timing for its four inputs; compared with TPS3808G33DBVR, it delivers comprehensive multirail supervision with overvoltage protection and watchdog capability essential for telecom and server platforms.

Availability

MAX6888DETE+ is available at Aetrix Electronics and suitable for telecom infrastructure, server power supply monitoring, and industrial edge controller applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6888DETE+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management solutions for industrial, communications, and computing markets.

The MAX6887/MAX6888 family was designed specifically for multivoltage system supervision in space-constrained telecom and server platforms, integrating quad voltage monitoring, overvoltage protection, and dual-mode watchdog functionality into a single 5mm × 5mm QFN package.

FAQ

What are the exact undervoltage and overvoltage thresholds for MAX6888DETE+?

The MAX6888DETE+ features factory-set thresholds: IN1 = 3.06V UV / 3.54V OV, IN2 = 2.31V UV / 2.68V OV, IN3 = 1.67V UV / 1.93V OV, and IN4 = 1.39V UV / 1.61V OV. These values are guaranteed within ±1% accuracy over -40°C to +85°C and correspond to nominal 3.3V, 2.5V, 1.8V, and 1.5V supply rails. All thresholds include 0.3% hysteresis to prevent chatter near trip points.

Can MAX6888DETE+ be powered from a dedicated VCC supply?

Yes, MAX6888DETE+ can be powered from an external VCC supply, but only if VCC is at least 200mV higher than any voltage applied to IN1–IN4 and is brought up first. Under normal operation, the device self-powers from the highest valid IN1–IN4 voltage (≥2.7V) using internal virtual diode-OR logic. External VCC is optional and not required for standard use cases.

How does the watchdog timer function in MAX6888DETE+?

The MAX6888DETE+ watchdog timer operates in two modes: an initial timeout of 102.4s after power-up or reset, followed by a normal timeout of 1.6s. It monitors WDI for edges (low-to-high or high-to-low); failure to toggle within the active timeout period asserts WDO. Connecting WDO to MR generates automatic system resets, and the watchdog clears when RESET goes low.

What is the role of the MARGIN pin on MAX6888DETE+?

The MARGIN pin on MAX6888DETE+ holds RESET, OV, and WDO outputs in their current state during system-level stress testing. When pulled low, it freezes output behavior regardless of input voltage changes or watchdog expiration - enabling overvoltage margining without triggering unintended resets. MARGIN overrides MR if both are asserted simultaneously.

Does MAX6888DETE+ require external pull-up resistors on its outputs?

Yes, MAX6888DETE+ requires external pull-up resistors on RESET, OV, and WDO because all three are active-low open-drain outputs. Typical values range from 4.7kΩ to 10kΩ, selected based on host logic voltage (1.8V–5V) and rise-time requirements. No pull-ups are needed on inputs (MR, MARGIN, WDI), as they feature internal current-source biasing.