Analog Devices Inc./Maxim Integrated MAX16004ETP+

Overview

The MAX16004ETP+ 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 typ timeout), manual reset (MR), margin enable (MARGIN), and tolerance-select (TOL) inputs - used in multivoltage server power sequencing and ASIC supervision.

For engineers reviewing the MAX16004ETP+ datasheet, MAX16004ETP+ pinout, MAX16004ETP+ application, or MAX16004ETP+ equivalent, key selection criteria include its six-rail monitoring capability, capacitor-adjustable 140ms–3.92ms reset timeout, guaranteed operation down to VCC = 1V, internal 30µA pullups on all open-drain outputs, and -40°C to +125°C industrial temperature range.

Technical Context

The MAX16004ETP+ implements a dual-path supervisory architecture: independent open-drain OUT1–OUT6 outputs per monitored rail, plus a shared active-low RESET that asserts if any INx falls below threshold or MR is pulled low. Its watchdog timer clears on WDI edges and enters a 54s startup delay after reset assertion.

Threshold accuracy is selectable via TOL pin (5% or 10% tolerance), and reset timeout is set either internally (min 140ms) or externally via SRT-to-GND capacitor (e.g., 1500pF yields ~3.09ms). All outputs remain valid down to VCC = 1V, supporting low-power system wake-up integrity.

Key Specifications

Pinout & Package

Package: 19-pin TQFN (4mm × 4mm, exposed pad), outline number 21-0139, land pattern 90-0022.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX16003ETP+, the MAX16004ETP+ adds watchdog timer functionality essential for autonomous CPU recovery; compared with TPS3808G33DBVR, it provides six-rail supervision, adjustable thresholds, and margin test support - making it uniquely suited for complex multivoltage ASIC and server platforms.

Availability

MAX16004ETP+ is available at Aetrix Electronics and suitable for server power sequencing, storage equipment supervision, and networking equipment requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MAX16004ETP+ 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 high-reliability ICs for industrial, automotive, communications, and computing markets.

The MAX16000–MAX16007 family was engineered specifically for multivoltage system supervision in space-constrained, thermally demanding environments - delivering integrated rail monitoring, reset control, and watchdog safety in miniature TQFN packages.

FAQ

What is the function of the MARGIN pin on the MAX16004ETP+?

The MARGIN pin on the MAX16004ETP+ is an active-low input that, when pulled low, deasserts all six OUTx outputs and the RESET output simultaneously - forcing them into high-impedance (high) state regardless of monitored voltage conditions. This enables safe voltage margin testing during production or field diagnostics without triggering false resets. The MAX16004ETP+ uses this feature to isolate fault responses while validating supply tolerance margins.

Can the MAX16004ETP+ monitor voltages below 1.0V?

Yes, the MAX16004ETP+ supports adjustable threshold monitoring down to 0.4V (typical) using its INx inputs with TOL = VCC configuration. Fixed thresholds start at 0.9V, but the adjustable mode allows precise supervision of sub-1V rails such as modern GPU core supplies or advanced SoC domains. The MAX16004ETP+ maintains full functionality including reset assertion and watchdog operation across this range.

How is the reset timeout period set on the MAX16004ETP+?

The reset timeout on the MAX16004ETP+ is set via the SRT pin: connecting SRT to VCC selects the internal minimum timeout of 140ms (typical 200ms), while connecting an external capacitor (CSRT) from SRT to GND scales the timeout linearly per tRP = 2.06 × 10⁶ × CSRT seconds. For example, a 1500pF capacitor yields ~3.09ms. The MAX16004ETP+ guarantees monotonic timeout behavior across -40°C to +125°C.

Does the MAX16004ETP+ require external pullup resistors on its outputs?

No, the MAX16004ETP+ does not require external pullup resistors: all six OUTx outputs and the RESET output feature internal 30µA pullups to VCC. These are sufficient to drive standard CMOS inputs and eliminate BOM components. However, each output remains compatible with external pullup voltages up to 5.5V - allowing level-shifting or interfacing with higher-voltage logic domains while retaining the MAX16004ETP+'s internal current source.

What is the watchdog startup behavior of the MAX16004ETP+ after power-on?

The MAX16004ETP+ watchdog timer enters a 54-second startup delay after any reset assertion (including power-on reset), during which no timeout occurs - allowing time for system initialization, clock stabilization, and software boot before watchdog monitoring begins. This delay is fixed and non-adjustable. The MAX16004ETP+ resumes normal watchdog operation (1.6s timeout) only after the delay expires and a valid WDI edge is detected.