Analog Devices Inc./Maxim Integrated MAX16004ATP+

Overview

The MAX16004ATP+ from Maxim Integrated is a low-voltage, hex-voltage microprocessor supervisor IC in a 19-pin TQFN (4mm × 4mm) package, monitoring six independent supply rails (IN1–IN6) with fixed and adjustable thresholds (e.g., 3.3V, 2.5V, 1.8V, down to 0.4V), featuring an active-low RESET output, watchdog timer (1.6s typical timeout), manual reset (MR), margin enable (MARGIN), and tolerance-select (TOL) inputs - used in multivoltage server power sequencing.

For engineers reviewing the MAX16004ATP+ datasheet, MAX16004ATP+ pinout, MAX16004ATP+ application, or MAX16004ATP+ equivalent, key selection criteria include its six-rail monitoring capability, 140ms minimum reset timeout (capacitor-adjustable), -40°C to +125°C operation, internal 30µA pullups on all open-drain outputs, and watchdog startup delay of 54s after reset assertion.

Technical Context

The MAX16004ATP+ implements a multi-threshold voltage monitoring architecture with independent comparator-based detection per input (IN1–IN6), each supporting either fixed thresholds (5% or 10% tolerance selectable via TOL pin) or adjustable thresholds down to 0.4V. Its RESET output asserts when any monitored voltage falls below its threshold or MR is pulled low, remaining asserted for a programmable timeout after recovery.

It integrates a watchdog timer with 1.6s typical timeout period and 54s startup delay, cleared by WDI edge transitions; the timer disables when WDI is left floating. All outputs are open-drain with internal 30µA pullups, eliminating external resistors while supporting external drive up to 5.5V.

Key Specifications

Pinout & Package

Package: 19-pin TQFN (4mm × 4mm, exposed pad), RoHS-compliant, thermal performance optimized via EP-to-GND connection.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervision applications.

Compared with MAX16003ATP+, the MAX16004ATP+ offers identical supervision functionality but with a different factory-set threshold combination (e.g., 3.3V/2.5V/ADJ/1.8V/ADJ/ADJ); versus TPS3808G33DBVR, it provides six independent channels, watchdog, and margin control - making it irreplaceable in multivoltage server and networking platforms.

Availability

MAX16004ATP+ is available at Aetrix Electronics and suitable for storage equipment, servers, and networking/telecommunication equipment requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MAX16004ATP+ 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 and mixed-signal ICs for industrial, communications, computing, and automotive markets.

The MAX16000–MAX16007 family was engineered specifically for multivoltage system supervision in high-reliability computing infrastructure, emphasizing rail independence, wide temperature operation, and integration of reset, watchdog, and margin functions in compact packages.

FAQ

What is the reset timeout behavior of the MAX16004ATP+ when SRT is connected to VCC?

The MAX16004ATP+ asserts RESET for a minimum of 140ms when SRT is tied to VCC. This internally set timeout ensures sufficient hold time for power stabilization across all six monitored rails before releasing the system from reset. The actual timeout may extend up to 280ms over temperature and process variation, as specified in the Electrical Characteristics table.

Can the MAX16004ATP+ monitor voltages below 1.0V, and what is the lowest supported threshold?

Yes, the MAX16004ATP+ supports adjustable thresholds down to 0.366V (with TOL = VCC) or 0.388V (with TOL = GND), enabling supervision of sub-1V core supplies such as 0.85V or 0.75V FPGA domains. Fixed thresholds start at 0.9V, but the adjustable mode allows precise customization for advanced low-voltage ASICs.

How does the watchdog timer in the MAX16004ATP+ behave after power-up or reset release?

After RESET deasserts, the MAX16004ATP+ watchdog enters a 54-second startup delay before beginning timeout counting. During this window, no WDI transition is required. Once started, the timer resets on every rising or falling edge of WDI and asserts RESET if no edge occurs within 1.12–2.40s. Leaving WDI unconnected disables the watchdog entirely.

Does the MAX16004ATP+ require external pullup resistors on its open-drain outputs?

No, the MAX16004ATP+ integrates 30µA internal pullups on all open-drain outputs (OUT1–OUT6 and RESET), eliminating the need for external resistors. Each output can also be driven by an external voltage up to 5.5V, allowing level-shifting into higher-voltage logic domains without additional components.

What is the purpose of the MARGIN pin on the MAX16004ATP+, and how is it used in production testing?

The MARGIN pin on the MAX16004ATP+ is an active-low input that forces all OUT_ and RESET outputs high, overriding voltage fault conditions. In production testing, it enables safe margin testing - applying controlled voltage derating to individual rails while keeping the system operational and preventing unintended resets during parametric validation.