Analog Devices Inc./Maxim Integrated MAX6889ETJ+T

Overview

The MAX6889ETJ+T from Maxim Integrated is an EEPROM-configurable, octal-input, ten-output power-supply sequencer/supervisor designed for multivoltage system power management. It features eight voltage detector inputs (IN1–IN8), ten programmable outputs (PO1–PO10), ±1% threshold accuracy, 25µs–1600ms configurable timing delays, and SMBus/I²C interface for configuration - deployed in telecom servers and multi-rail embedded systems.

For engineers reviewing the MAX6889ETJ+T datasheet, MAX6889ETJ+T pinout, MAX6889ETJ+T application, or MAX6889ETJ+T equivalent, this page delivers verified technical context, real-world sequencing use cases, validated alternatives, and supply-chain support details specific to the 32-pin Thin QFN-EP package and extended-temperature (-40°C to +85°C) operation.

Technical Context

The MAX6889ETJ+T implements a hierarchical digital control architecture with independent timing blocks per output, enabling precise sequencing across up to ten power rails. Its eight voltage detectors include two high-voltage inputs (IN1 and IN8) supporting 1.25V–15.25V thresholds in fine increments (25mV/50mV), plus six mid-range inputs (IN2–IN7) covering 0.5V–5.5V in 10mV/20mV steps.

Each of the ten programmable outputs supports active-high, active-low, open-drain, or weak-pullup drive modes and can be triggered by any combination of voltage inputs, GPI signals, watchdog timeout, or manual reset. The integrated watchdog timer offers independently programmable initial/normal timeouts (6.25ms–102.4s) and flexible clearing logic tied to GPI or PO states.

Key Specifications

Pinout & Package

MAX6889ETJ+T is housed in a 32-pin, 5mm × 5mm × 0.8mm thin QFN package with exposed thermal pad (EP), optimized for high-density PCB layouts and thermal performance in power management IC applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6890ETI+, the MAX6889ETJ+T adds two voltage inputs and two outputs for complex multirail systems; compared with TPS659122ZQV, it provides standalone, nonvolatile, host-independent sequencing ideal for safety-critical or headless deployments.

Availability

MAX6889ETJ+T is available at Aetrix Electronics and suitable for telecom server power sequencing, multi-processor board supervision, and base station RF front-end control requiring stable component supply, long-term lifecycle support, and guaranteed extended-temperature operation.

Supply support for MAX6889ETJ+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, mixed-signal, and power management ICs for demanding industrial, communications, and computing applications.

The MAX6889ETJ+T belongs to Maxim's EEPROM-programmable power-supply sequencer family, engineered specifically for autonomous, field-configurable, multivoltage sequencing in high-reliability infrastructure equipment where firmware independence and EEPROM-retained settings are critical.

FAQ

What is the primary function of the MAX6889ETJ+T in a power management system?

The MAX6889ETJ+T serves as an autonomous, EEPROM-configurable power-supply sequencer and supervisor. It monitors eight voltage rails and four logic inputs, then asserts up to ten programmable outputs - each with individually configurable polarity, drive type, and timing delay - to orchestrate safe, repeatable power-up, power-down, and fault-response sequences without host processor involvement. Its nonvolatile configuration ensures consistent behavior across power cycles.

Does the MAX6889ETJ+T support I²C communication, and what are its interface limitations?

Yes, the MAX6889ETJ+T features an SMBus/I²C-compatible 2-wire serial interface operating up to 400kHz. It uses open-drain SDA/SCL pins requiring external pullups, and two address pins (A0, A1) allowing up to four MAX6889ETJ+T devices on a single bus. The interface accesses configuration registers, internal 512-bit user EEPROM, and configuration EEPROM - but does not support hot-plug or clock stretching per datasheet timing specs.

How many voltage inputs does the MAX6889ETJ+T monitor, and what are their threshold ranges?

The MAX6889ETJ+T monitors eight voltage inputs: IN1 and IN8 are high-voltage inputs supporting 1.25V–7.625V (25mV steps) or 2.5V–15.25V (50mV steps); IN2–IN7 cover 0.5V–5.5V in 10mV/20mV steps. In high-impedance mode, IN2–IN7 can detect as low as 0.167V using external resistive dividers - confirmed in Electrical Characteristics Table and Pin Description section.

Can the MAX6889ETJ+T operate without an external microcontroller after initial configuration?

Yes. The MAX6889ETJ+T stores all sequencing logic, voltage thresholds, timing delays, and output configurations in internal EEPROM. Once programmed, it operates autonomously - monitoring inputs, executing conditional output assertions, and managing watchdog timeouts - without any host processor interaction. This makes MAX6889ETJ+T ideal for headless or safety-critical systems where firmware reliability cannot be assumed.

What is the role of the MARGIN and MR pins on the MAX6889ETJ+T?

The MARGIN pin disables margining functions and holds programmable outputs in their current state when driven low; the MR (Manual Reset) pin forces a user-defined reset state on selected outputs when asserted. Both pins are internally pulled up to DBP via 10µA current sources. MARGIN takes priority over MR if both are asserted simultaneously - a behavior explicitly defined in the Pin Description and Detailed Description sections of the datasheet.