Analog Devices Inc./Maxim Integrated MAX16009TG+T

Overview

MAX16009TG+T from Maxim Integrated is a quad window voltage detector IC designed for multivoltage system monitoring in servers and telecom equipment. It monitors four independent supply rails with user-adjustable undervoltage/overvoltage thresholds down to 0.4V, provides four open-drain fault outputs, and features a manual reset input (MR), margin enable (MARGIN), and adjustable reset timeout via external capacitor on SRT pin. Its 24-pin TQFN package operates from -40°C to +125°C.

For engineers reviewing the MAX16009TG+T datasheet, MAX16009TG+T pinout, MAX16009TG+T application, or MAX16009TG+T equivalent, key selection considerations include its 1.5% threshold accuracy over temperature, 140ms minimum internal reset timeout, 30µA internal pullup on all open-drain outputs, and support for external resistor-based threshold programming across four independent windows.

Technical Context

The MAX16009TG+T implements four independent window comparators, each with separate UVIN_/OVIN_ inputs and corresponding UVOUT_/OVOUT_ open-drain outputs. Thresholds are set externally using three resistors per channel, enabling precise low-voltage monitoring down to 0.4V with 0.5% hysteresis relative to threshold.

It integrates a dedicated reset generator with factory-set 140ms (min) timeout, adjustable via SRT capacitor (50µs–1.12s range), plus an active-low manual reset (MR) input with 20kΩ internal pullup and 200ns propagation delay. The MARGIN input disables all outputs without halting internal monitoring.

Key Specifications

Pinout & Package

MAX16009TG+T is housed in a 4mm × 4mm, 24-pin thin QFN package with exposed pad (EP) internally connected to GND for thermal management. Pin 1 is located at top-left corner (marked by dot); EP must be soldered to PCB ground plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad window voltage detector applications.

Compared with MAX16008TP+, MAX16009TG+T adds integrated reset control with manual and timeout capability, making it suitable for autonomous power management. Compared with TLV809E33DBVR, it delivers four-channel window detection in one package with design flexibility unattainable using discrete single-channel supervisors.

Availability

MAX16009TG+T is available at Aetrix Electronics and suitable for server power sequencing, telecom line card monitoring, industrial PLC power management, and storage controller voltage integrity requiring stable component supply across extended temperature and long product lifecycles.

Supply support for MAX16009TG+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.

The MAX16009TG+T belongs to Maxim's precision voltage supervisor product line, engineered specifically for high-reliability multivoltage system monitoring in servers, networking gear, and industrial controllers where accuracy, temperature stability, and integrated reset control are critical.

FAQ

What is the minimum supply voltage required for MAX16009TG+T to guarantee correct output logic states?

The MAX16009TG+T guarantees correct output logic states down to VCC = 1.0V, as specified in the Electrical Characteristics table under UVLO (Undervoltage Lockout). This ensures reliable operation during brownout conditions or low-power startup sequences where VCC may dip below nominal levels. The device remains functional and maintains defined output behavior even at this minimum rail voltage, which is critical for fail-safe system monitoring in industrial and automotive applications.

How is the reset timeout period configured on the MAX16009TG+T?

The reset timeout period on the MAX16009TG+T is configured using an external capacitor connected between the SRT pin and GND. The timeout (tRP) is calculated as tRP = 2.06 × 10⁶ × CSRT seconds, supporting a range from 50µs to 1.12s. For the factory-default 140ms (min) timeout, SRT is connected to VCC. Capacitor values above 390nF are prohibited, and the internal SRT current (460–740nA) and threshold (1.173–1.293V) define the timing accuracy. This method eliminates timing resistors and enables precise, repeatable reset durations.

Can unused UVIN_ or OVIN_ inputs on the MAX16009TG+T be left floating?

No, unused UVIN_ inputs on the MAX16009TG+T must be connected to VCC, and unused OVIN_ inputs must be connected to GND. Floating inputs risk unpredictable comparator behavior due to leakage currents and noise susceptibility, potentially causing false fault assertions. This requirement is explicitly stated in the Applications Information section of the datasheet. Connecting to defined rails ensures stable biasing and prevents unintended activation of UVOUT_/OVOUT_ outputs, preserving system reliability during both operation and standby modes.

What is the purpose of the MARGIN input on the MAX16009TG+T, and how does it affect monitoring?

The MARGIN input on the MAX16009TG+T is an active-low signal that disables all UVOUT_, OVOUT_, and RESET outputs while preserving internal voltage monitoring. When pulled low, outputs go high-impedance (deasserted), allowing system-level margin testing - e.g., adjusting supply voltages outside nominal ranges - without triggering false faults. Internal comparators continue sampling UVIN_/OVIN_ continuously, and outputs resume normal behavior within 50µs after MARGIN is released. This enables safe validation of power supply tolerance margins without interrupting system operation.

Does the MAX16009TG+T support interfacing with logic supplies different from VCC?

Yes, the MAX16009TG+T supports interfacing with logic supplies different from VCC via its open-drain UVOUT_, OVOUT_, and RESET outputs. Each output has a 30µA internal pullup to VCC but can be externally pulled up to any voltage up to 5.5V, enabling direct connection to 1.8V, 2.5V, or 5V logic families. Internal circuitry prevents reverse current flow from the external pullup into VCC. Resistor values between 50kΩ and 200kΩ are recommended to ensure proper VOH specification compliance while overdriving the internal pullup current.