Analog Devices Inc./Maxim Integrated MAX6889ETJ+

Overview

The MAX6889ETJ+ 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 - used in server motherboard power sequencing to coordinate startup of CPU, memory, and I/O rails.

For engineers reviewing the MAX6889ETJ+ datasheet, MAX6889ETJ+ pinout, MAX6889ETJ+ application, or MAX6889ETJ+ equivalent, this page delivers verified technical context, exact pin functions, real-world sequencing use cases, and validated alternative options for high-reliability telecom and computing infrastructure designs.

Technical Context

The MAX6889ETJ+ implements a digital logic network that maps up to eight voltage detector inputs and four general-purpose logic inputs (GPI1–GPI4) to ten independently configurable outputs via programmable timing blocks and conditional assertion logic. Each output supports active-high, active-low, open-drain, or weak-pullup drive modes with deassertion delays selectable from 25µs to 1600ms.

It integrates a dual-mode watchdog timer with independently programmable initial/normal timeout periods (6.25ms–102.4s), configurable GPI_/PO_ trigger conditions, and 512-bit user EEPROM (100k write cycles, 10-year retention). Power is derived from IN1 (≥6.5V) or highest of IN2–IN5 (≥2.7V), with internal LDO regulation to 5.4V for analog circuitry and 2.55V for digital logic (DBP).

Key Specifications

Pinout & Package

MAX6889ETJ+ is housed in a 32-pin, 5mm × 5mm × 0.8mm thin QFN package with exposed thermal pad (EP), rated for –40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6890ETI+, MAX6889ETJ+ adds two voltage inputs (IN7/IN8) and two outputs (PO9/PO10), enabling more complex sequencing trees; versus TPS65988DHAR, it offers field-reprogrammable EEPROM, broader voltage range, and direct I²C integration - critical for non-USB infrastructure.

Availability

MAX6889ETJ+ is available at Aetrix Electronics and suitable for server motherboard design, telecom shelf power management, and storage controller sequencing requiring stable component supply, long-term lifecycle assurance, and full traceability.

Supply support for MAX6889ETJ+ 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 ICs for industrial, communications, and computing markets.

The MAX6889/MAX6890/MAX6891 product line was engineered to replace discrete power sequencing solutions in high-density, multivoltage systems - delivering configurability, precision, and reliability for telecom, server, and storage equipment.

FAQ

What is the maximum number of voltage rails the MAX6889ETJ+ can monitor and sequence?

The MAX6889ETJ+ monitors eight independent voltage inputs (IN1–IN8) and controls ten programmable outputs (PO1–PO10), enabling full sequencing of up to eight power rails with redundant or auxiliary control signals. This capability is confirmed in the Functional Diagram and Pin Description sections of the official datasheet, where IN8 and PO9/PO10 are explicitly allocated to the MAX6889 variant - making MAX6889ETJ+ the highest-channel-count member of the family.

Does the MAX6889ETJ+ support I²C communication at standard-mode (100kHz) and fast-mode (400kHz) speeds?

Yes, the MAX6889ETJ+ supports SMBus/I²C communication at up to 400kHz, as specified in the Electrical Characteristics table under "Serial Clock Frequency (fSCL)" with a minimum value of 400kHz. The device meets standard I²C timing requirements including tSU:STA (0.6µs), tHD:DAT (30–900ns), and rise/fall time limits - ensuring interoperability with common microcontroller I²C peripherals without additional level-shifting or timing adjustments.

How does the MAX6889ETJ+ derive its internal power supply, and what are the voltage requirements?

The MAX6889ETJ+ derives power either from IN1 (if ≥6.5V) or from the highest of IN2–IN5 (if ≥2.7V), using an internal virtual diode-ORing scheme. When powered from IN1, an internal LDO regulates it to 5.4V for VCC (analog circuitry) and 2.55V for DBP (digital logic/EEPROM). External VCC supply is optional but must meet 2.7V–5.5V specifications - all details are confirmed in the "Powering the MAX6889/MAX6890/MAX6891" section of the datasheet.

Can the MAX6889ETJ+ watchdog timer be configured to reset only specific outputs instead of all ten?

Yes, the MAX6889ETJ+ watchdog timer can be programmed to assert any subset of the ten programmable outputs (PO1–PO10), not necessarily all. Configuration is performed via the watchdog control register (address 0x1E), where individual PO_ bits determine which outputs respond to watchdog timeout - allowing selective reset of critical subsystems (e.g., CPU core) while leaving peripheral rails unaffected, as documented in Table 21 and the Watchdog Timer section.

What is the guaranteed threshold accuracy of the MAX6889ETJ+ over temperature, and which inputs meet the ±1% specification?

The MAX6889ETJ+ guarantees ±1% threshold accuracy over –40°C to +85°C for inputs operating at VIN ≥2.5V - specifically applying to IN1 and IN8 when configured in their 50mV-increment ranges (2.5V–13.2V and 2.5V–15.25V), and to IN2–IN7 when set to 20mV increments within 2.5V–5.5V. This is explicitly stated in the Electrical Characteristics table under "IN1/IN8 Threshold Accuracy" and "IN2–IN7 Threshold Accuracy" rows with TA = –40°C to +85°C conditions.