Analog Devices Inc./Maxim Integrated MAX16004ATP+T

Overview

The MAX16004ATP+T from Maxim Integrated is a low-voltage, hex-voltage microprocessor supervisor IC in a 19-pin TQFN (4mm × 4mm) package. It monitors six independent supply rails (IN1–IN6) with fixed thresholds for 3.3V, 2.5V, 1.8V, and adjustable thresholds down to 0.4V, provides an active-low RESET output asserting on any undervoltage or manual reset, and integrates a 1.6s watchdog timer with 54s startup delay-used in multivoltage server power sequencing and ASIC supervision.

For engineers reviewing the MAX16004ATP+T datasheet, MAX16004ATP+T pinout, MAX16004ATP+T application, or MAX16004ATP+T equivalent, key selection criteria include its six-rail monitoring capability, capacitor-adjustable 140ms–280ms reset timeout, internal 30µA pullups eliminating external resistors, -40°C to +125°C operation, and watchdog timer behavior with MR/SRT/MARGIN control inputs.

Technical Context

The MAX16004ATP+T implements independent voltage monitoring per input with hysteresis (0.5% of threshold), open-drain outputs with internal 30µA pullups, and a reset output that asserts when any monitored voltage falls below its threshold or MR is pulled low. Its watchdog timer clears on WDI edge transitions and enters a 54s startup window after reset deassertion.

Reset timeout is set either internally (min 140ms) via SRT = VCC or externally using a capacitor (t_RP = 2.06 MΩ × C_SRT), while TOL selects 5% or 10% threshold tolerance and MARGIN enables simultaneous output deassertion during margin testing-supporting robust power-good validation in high-reliability systems.

Key Specifications

Pinout & Package

MAX16004ATP+T is housed in a 19-pin TQFN package (4mm × 4mm, 0.5mm pitch) with exposed thermal pad (EP) internally connected to GND. Pin 1 is marked by a dot; EP must be soldered to PCB ground plane for thermal management.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX16003ATP+T and TPS3808G33DBVR, the MAX16004ATP+T uniquely combines six-rail monitoring, capacitor-adjustable reset timeout, and integrated watchdog with 54s startup delay-making it optimal for compact, high-integration server and networking platforms requiring coordinated power supervision.

Availability

MAX16004ATP+T 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 production lifecycles.

Supply support for MAX16004ATP+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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.

The MAX16000–MAX16007 family was engineered specifically for multivoltage system supervision in high-reliability computing infrastructure-emphasizing rail independence, wide temperature operation, and minimal external component count.

FAQ

What is the function of the SRT pin on the MAX16004ATP+T?

The SRT (Set Reset Timeout) pin on the MAX16004ATP+T determines the duration of the RESET assertion period. When tied to V_CC, it enables the internal minimum timeout of 140ms. Connecting an external capacitor from SRT to GND adjusts the timeout per t_RP = 2.06 MΩ × C_SRT, allowing precise tailoring of reset hold time in the MAX16004ATP+T without firmware intervention.

Does the MAX16004ATP+T support adjustable voltage thresholds for all six inputs?

Yes-the MAX16004ATP+T supports adjustable thresholds (down to 0.4V) on all six monitored inputs (IN1–IN6), in addition to factory-configured fixed thresholds including 3.3V, 2.5V, and 1.8V. Threshold selection is defined by the specific variant (e.g., MAX16004A vs. MAX16004E); the MAX16004ATP+T corresponds to the 'A' variant with fixed 3.3V/2.5V/1.8V on IN1/IN2/IN4 and adjustable on IN3/IN5/IN6.

How does the watchdog timer behave after power-on reset in the MAX16004ATP+T?

After power-on or MR-initiated reset, the MAX16004ATP+T watchdog timer enters a 54-second startup delay before beginning timeout counting. During this window, no WDI edge is required to prevent RESET assertion. This prevents false timeouts during slow power ramp-up of complex multirail systems-a critical behavior confirmed in the MAX16004ATP+T datasheet.

Can the MARGIN pin be used to disable RESET output independently of the monitored voltages in the MAX16004ATP+T?

No-the MARGIN pin on the MAX16004ATP+T deasserts all OUT1–OUT6 outputs but does not affect the RESET output. RESET remains asserted if any monitored voltage is below threshold or MR is active. MARGIN only forces OUTx high regardless of input conditions, enabling safe margin testing without interfering with system-level reset integrity in the MAX16004ATP+T.

What is the maximum sink current supported by the RESET output of the MAX16004ATP+T?

The RESET output of the MAX16004ATP+T is an open-drain structure rated for 10mA sink current at V_CC = 3.3V with VOL ≤ 0.30V. At lower V_CC (e.g., 2.5V), it supports 6mA; at 1.2V, it supports 50µA. These values are guaranteed across -40°C to +125°C and define the drive strength available to pull down external logic or reset lines in the MAX16004ATP+T application.