Analog Devices Inc./Maxim Integrated MAX6875ETJ+

Overview

The MAX6875ETJ+ from Maxim Integrated is a quad-voltage, EEPROM-programmable power-supply sequencer/supervisor with four configurable voltage detector inputs (IN1–IN4), three general-purpose logic inputs (GPI1–GPI3), and five programmable open-drain outputs (PO1–PO5). It supports undervoltage monitoring across 0.5V–13.2V ranges with ±1% threshold accuracy, 25µs–1600ms programmable output delays, and SMBus/I²C configuration interface. It is used in multi-rail server power sequencing where precise timing and flexible reset control are required.

For engineers reviewing the MAX6875ETJ+ datasheet, MAX6875ETJ+ pinout, MAX6875ETJ+ application, or MAX6875ETJ+ equivalent, this page delivers verified functional identity, validated pin roles, confirmed sequencing parameters, and real-world use context - all derived from Maxim's official documentation for the exact ETJ package variant.

Technical Context

The MAX6875ETJ+ implements a dual-domain power architecture: IN1 (high-voltage input, up to +13.2V) or IN3–IN4 (low-voltage inputs, +2.7V to +5.5V) supplies internal circuitry via virtual diode-ORing, generating regulated ABP (+5.4V analog supply) and DBP (+2.55V digital/EEPROM supply). Its eight-stage logic network routes GPI_, MR, MARGIN, watchdog events, and voltage-detector assertions through configurable timing blocks to drive PO1–PO5.

Each of the five outputs is independently programmable as active-high or active-low open-drain, with deassertion delays selectable from 25µs to 1600ms in eight discrete steps. Two independent watchdog timers support initial and normal timeout periods (6.25ms–102.4s), each clearable by GPI_ inputs, PO_ outputs, or their combination - enabling robust system-level fault recovery in telecom and storage platforms.

Key Specifications

Pinout & Package

Package: 32-pin 7mm × 7mm × 0.8mm thin QFN (T3277-2), exposed paddle (EP) internally connected to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6874ETJ+, the MAX6875ETJ+ reduces pin count and simplifies configuration for quad-rail systems, while retaining identical timing resolution, watchdog flexibility, and ±1% threshold accuracy; versus TPS659122ZQV, it provides superior high-voltage monitoring (up to +13.2V) and standalone supervisory integrity without integrated regulation overhead.

Availability

MAX6875ETJ+ is available at Aetrix Electronics and suitable for server power sequencing, telecom line card supervision, storage controller boards, and industrial multimicroprocessor systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for MAX6875ETJ+ 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 demanding industrial, communications, and computing applications.

The MAX6875ETJ+ belongs to Maxim's EEPROM-programmable power-supply sequencer/supervisor family, engineered specifically for high-reliability, multi-rail power management in servers, storage, and telecom infrastructure where configurability, accuracy, and nonvolatile setup persistence are critical.

FAQ

What is the maximum input voltage supported by the MAX6875ETJ+ on its IN1 pin?

The MAX6875ETJ+ supports up to +13.2V on its IN1 pin when configured in the 50mV threshold increment mode (2.5V to +13.2V range). In the 25mV mode, the upper limit is +7.625V. Absolute maximum rating for IN1 is +14V, but sustained operation above +13.2V violates specification limits. The device derives internal power from IN1 only when VIN1 ≥ +6.5V, regulating it to +5.4V for ABP.

How many programmable outputs does the MAX6875ETJ+ have, and what are their electrical characteristics?

The MAX6875ETJ+ has five programmable open-drain outputs: PO1 through PO5. Each supports active-high or active-low configuration and deassertion delays from 25µs to 1600ms. PO1–PO2 sink up to 500µA at VABP ≥ +2.5V (VOL ≤ 0.3V); PO3–PO5 sink up to 1mA under same conditions. All outputs tolerate up to +6V and feature <1µA leakage in high-impedance state.

Does the MAX6875ETJ+ include internal EEPROM, and what is its endurance?

Yes, the MAX6875ETJ+ integrates 4kb of user-accessible EEPROM plus separate configuration EEPROM. The user EEPROM supports 100,000 erase/write cycles and guarantees 10 years of data retention at +85°C. Configuration memory is write-protected via dedicated lock bits. This nonvolatile storage retains sequencing logic, voltage thresholds, timing delays, and watchdog settings across power cycles without external memory.

Can the MAX6875ETJ+ be powered from multiple input sources simultaneously?

Yes - the MAX6875ETJ+ uses a virtual diode-ORing scheme to auto-select its power source: if IN1 ≥ +6.5V, it powers from IN1 (regulated to +5.4V ABP); otherwise, it selects the highest voltage among IN3 and IN4 (provided ≥ +2.7V). Operation is undefined if +4V < VIN1 < +6.5V and IN3/IN4 > +2.7V due to LDO dropout ambiguity. ABP and DBP outputs must be bypassed with 1µF ceramic capacitors and cannot power external circuitry.

What communication protocol does the MAX6875ETJ+ use for configuration, and what are its timing limits?

The MAX6875ETJ+ uses an SMBus/I²C-compatible serial interface with SDA and SCL pins. It supports standard-mode (100kHz) and fast-mode (400kHz) operation. Minimum clock low time is 1.3µs, clock high time is 0.6µs, and bus-free time is 1.3µs. It responds to 7-bit addresses set by A0 (and A1 on MAX6874 only); MAX6875ETJ+ supports up to two devices per bus using A0 alone.