Analog Devices Inc./Maxim Integrated MAX16004BTP+

Overview

MAX16004BTP+ 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, 1.8V, down to 0.4V), featuring an active-low RESET output asserting on any undervoltage or manual reset, and integrated watchdog timer with 1.6s typical timeout - used in multivoltage server power sequencing and ASIC supervision.

For engineers reviewing the MAX16004BTP+ datasheet, MAX16004BTP+ pinout, MAX16004BTP+ application, or MAX16004BTP+ equivalent, key selection considerations include its 6-channel monitoring capability, capacitor-adjustable 140ms–280ms reset timeout, internal 30µA pullups eliminating external resistors, -40°C to +125°C operation, and watchdog startup delay of 54s after reset assertion.

Technical Context

The MAX16004BTP+ implements a deterministic voltage-monitoring architecture with independent comparator-based detection per input channel, hysteresis of 0.5% V_TH, and propagation delay of 20µs from threshold crossing to output assertion. Its reset logic combines OR-ed fault conditions across all six monitored rails with MR and WDI inputs, holding RESET low for the full timeout period after recovery.

Watchdog functionality uses a precision RC oscillator with ±20% tolerance over temperature, initiating a 54s startup window before first timeout evaluation; WDI input leakage is limited to ±100nA to ensure reliable edge detection without loading external signal sources.

Key Specifications

Pinout & Package

MAX16004BTP+ is housed in a 19-pin, 4mm × 4mm, 0.5mm pitch TQFN package with exposed pad (EP) internally connected to GND for thermal management. Pin numbering follows standard top-view orientation with pin 1 marked by dot or chamfer.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX16003BTP+, MAX16004BTP+ adds watchdog supervision with 54s startup delay and edge-triggered WDI, while both support identical 6-channel monitoring and margin testing. Against TPS3808G33DBVR, MAX16004BTP+ provides six independent thresholds, adjustable inputs, and system-level reset coordination - critical for ASIC/FPGA platforms.

Availability

MAX16004BTP+ 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 MAX16004BTP+ 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, automotive, communications, and computing markets.

The MAX16000–MAX16007 family was engineered specifically for multivoltage system supervision in high-reliability computing infrastructure, emphasizing low quiescent current (45µA), wide temperature operation (-40°C to +125°C), and robust noise immunity in dense PCB layouts.

FAQ

What is the reset timeout behavior of the MAX16004BTP+ when SRT is left unconnected?

When SRT is left unconnected (open), the MAX16004BTP+ defaults to its internal minimum reset timeout of 140ms. This value is guaranteed across -40°C to +125°C and does not require external components. The device uses an internal 600nA current source and 1.235V threshold to generate this fixed delay, ensuring predictable power-on reset timing without capacitor placement.

How does the MAX16004BTP+ handle threshold tolerance selection, and what impact does it have on accuracy?

The MAX16004BTP+ uses the TOL pin to select between 5% and 10% input threshold tolerance: TOL = GND selects ±5%, TOL = VCC selects ±10%. This directly affects the hysteresis window (0.5% V_TH) and total accuracy band - for example, the 3.3V IN1 threshold shifts from ±0.165V (5%) to ±0.33V (10%). Designers choose based on supply rail stability requirements and noise margin needs.

Can the MAX16004BTP+ monitor a 0.9V supply rail, and which variant supports it?

The MAX16004BTP+ does not support fixed 0.9V monitoring - that capability is exclusive to the MAX16006F variant (8-channel, 5V/3.3V/3.0V/2.5V/1.8V/1.5V/1.2V/0.9V). However, MAX16004BTP+ supports adjustable thresholds down to 0.366V (TOL = VCC) or 0.388V (TOL = GND), enabling accurate supervision of 0.9V rails using external resistor dividers calibrated to those reference points.

What is the maximum sink current supported by the RESET output of the MAX16004BTP+?

The RESET output of the MAX16004BTP+ supports up to 10mA sink current while maintaining VOL ≤ 0.30V at VCC = 3.3V. At lower supply voltages (e.g., VCC = 2.5V), the rated sink current reduces to 6mA, and at VCC = 1.2V, it is 50µA - reflecting the device's guaranteed operation down to 1V and ensuring compatibility with legacy 1.2V logic families.

Does the MAX16004BTP+ provide independent watchdog output, or is watchdog status only available via RESET?

The MAX16004BTP+ asserts watchdog timeout exclusively through the shared RESET output - unlike MAX16005, it does not feature a dedicated WDO pin. When the watchdog times out, RESET goes low and remains asserted for the full reset timeout period (140ms+), identical to undervoltage-induced reset. This simplifies routing but requires system firmware to distinguish root cause via separate status registers or timing analysis.