Analog Devices Inc./Maxim Integrated MAX16009TG+

Overview

MAX16009TG+ 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 UVOUT/OVOUT fault signals, and features a reset output with 140ms (min) timeout and manual reset input - all in a 24-pin 4mm × 4mm TQFN package rated from −40°C to +125°C.

For engineers reviewing the MAX16009TG+ datasheet, MAX16009TG+ pinout, MAX16009TG+ application, or MAX16009TG+ equivalent, key selection considerations include its adjustable 0.4V–5.5V monitoring range, ±1.5% threshold accuracy over temperature, 30µA internal pullup on all open-drain outputs, 20µs propagation delay, and integrated SRT capacitor-based reset timeout adjustment.

Technical Context

The MAX16009TG+ implements four independent window comparators, each configured via three external resistors to set precise upper (OVIN_) and lower (UVIN_) trip thresholds. Its functional architecture includes dedicated margin enable (MARGIN) and manual reset (MR) inputs, plus a set-reset-time (SRT) node that interfaces with an external capacitor to program reset timeout from 50µs to 1.12s.

All eight monitored inputs (UVIN1–4, OVIN1–4) drive corresponding open-drain outputs (UVOUT1–4, OVOUT1–4), while RESET asserts low on any fault condition and remains asserted for the full timeout after all voltages return to spec and MR is deasserted. The device guarantees correct logic states down to VCC = 1V and operates with 45–70µA supply current across 2.0–5.5V VCC.

Key Specifications

Pinout & Package

MAX16009TG+ is housed in a 24-pin, 4mm × 4mm thin QFN package with exposed pad (EP) internally connected to GND. Thermal performance is optimized by soldering EP to the 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+, the MAX16009TG+ adds integrated reset coordination and manual reset - eliminating external RC timers and pushbutton debounce circuits. Versus TPS3307-18DGNR, it delivers full configurability for nonstandard rails and tighter accuracy, making it essential for high-density, thermally stressed server and storage platforms.

Availability

MAX16009TG+ is available at Aetrix Electronics and suitable for server power sequencing, telecom line card supervision, industrial PLC backplane monitoring, and NVMe storage controller voltage guardbanding requiring stable component supply across extended temperature and long production lifecycles.

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

The MAX16009TG+ belongs to Maxim's precision voltage supervisor product line, engineered specifically for multirail reliability in high-availability infrastructure equipment operating across −40°C to +125°C.

FAQ

What is the minimum supply voltage at which MAX16009TG+ guarantees correct output logic states?

The MAX16009TG+ guarantees correct output logic states down to VCC = 1.0V, as specified in the Electrical Characteristics table under UVLO (undervoltage lockout). This ensures reliable fault signaling even during brownout conditions before full power-up, and is validated across the full −40°C to +125°C operating range. The MAX16009TG+ maintains this guarantee while consuming only 45–70µA supply current.

How does the SRT pin on MAX16009TG+ control reset timeout, and what capacitor value yields the factory default 140ms?

The SRT pin on MAX16009TG+ sets reset timeout by connecting an external capacitor (CSRT) to GND. Timeout is calculated as tRP (s) = 2.06 × 10⁶ × CSRT (F). For the factory default 140ms (min), SRT is connected directly to VCC - no capacitor is used. To achieve exactly 140ms, a 68nF capacitor yields ~140ms (2.06e6 × 68e−9 = 140.08ms), staying well within the 390nF maximum limit. The MAX16009TG+ datasheet specifies this relationship and warns against exceeding 1.12s timeout.

Can unused UVIN_ or OVIN_ inputs on MAX16009TG+ be left floating, and what is the recommended termination?

No, unused UVIN_ or OVIN_ inputs on MAX16009TG+ must not be left floating. Per the Applications Information section, all unused UVIN_ inputs must be tied to VCC, and all unused OVIN_ inputs must be tied to GND. This prevents false triggering due to noise coupling or leakage currents, ensuring deterministic comparator behavior. The MAX16009TG+ input bias current is only ±100nA, so these terminations impose negligible loading on the supply rails.

What is the function of the MARGIN pin on MAX16009TG+, and how does it interact with ongoing voltage monitoring?

The MARGIN pin on MAX16009TG+ is an active-low input that globally disables all UVOUT_, OVOUT_, and RESET outputs while preserving real-time voltage monitoring. When pulled low, outputs go high-impedance (deasserted) regardless of input conditions - enabling safe margin testing of supply rails. Critically, the MAX16009TG+ continues sampling UVIN_/OVIN_ voltages internally; upon MARGIN release, outputs update within 50µs based on latest measurements. This allows test automation without interrupting supervision integrity.

Does MAX16009TG+ support interfacing with logic systems operating at voltages other than VCC, and how is this achieved?

Yes, MAX16009TG+ supports interfacing with logic systems at voltages other than VCC via its open-drain UVOUT_, OVOUT_, and RESET outputs. Each output has a 30µA internal pullup to VCC but accepts external pullup to any voltage up to 5.5V. An external resistor (typically 50kΩ–200kΩ) pulls the output to the target logic rail (e.g., 1.8V or 2.5V), and internal circuitry blocks reverse current flow into VCC. This capability is explicitly confirmed in the Electrical Characteristics table and Figure 5 of the MAX16009TG+ datasheet.