Analog Devices Inc./Maxim Integrated MAX16061BTP+

Overview

MAX16061BTP+ from Maxim Integrated is a 1% accurate, hex-voltage microprocessor supervisor IC in a 20-pin thin QFN (4mm × 4mm) package, monitoring six independent supply rails (e.g., 3.3V, 2.5V, 1.8V, and adjustable down to 0.373V), featuring open-drain outputs with internal 30µA pullups, a 140ms minimum reset timeout, and a 1.6s typical watchdog timer - deployed in multivoltage server power sequencing and ASIC supervisory systems.

For engineers reviewing the MAX16061BTP+ datasheet, MAX16061BTP+ pinout, MAX16061BTP+ application, or MAX16061BTP+ equivalent, key selection criteria include its six-rail monitoring capability, factory-preset threshold configuration (B variant: IN1=3.3V, IN2=ADJ, IN3=ADJ, IN4=1.8V, IN5=ADJ, IN6=ADJ), tolerance-selectable thresholds (5%/10%), margin-enable functionality, and guaranteed operation from -40°C to +125°C.

Technical Context

The MAX16061BTP+ implements six independent voltage comparators with 1% accuracy over temperature, each driving an open-drain output with internal 30µA pullup to VCC. Its RESET output is asserted when any monitored rail falls below its threshold or MR is pulled low, and remains asserted for a user-adjustable timeout (≥140ms) after all rails recover and MR is released.

It integrates a watchdog timer with 1.6s typical timeout and 54s startup delay, disabled by leaving WDI floating; threshold tolerance (5% or 10%) is selected via TOL pin; and MARGIN input allows simultaneous deassertion of all outputs during margin testing - all operating across VCC = 1.0V to 5.5V with guaranteed assertion down to VCC = 1V.

Key Specifications

Pinout & Package

MAX16061BTP+ uses a 20-pin thin QFN package (4mm × 4mm, exposed pad), RoHS-compliant and lead-free (+ suffix), with thermal pad internally connected to GND for enhanced heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX16061ATP+, the MAX16061BTP+ trades fixed 2.5V monitoring for two additional adjustable inputs - increasing flexibility in custom rail configurations. Against TPS3808G33DBVR, it delivers six-fold monitoring density, 2× accuracy, and integrated test/debug features essential for complex embedded systems.

Availability

MAX16061BTP+ is available at Aetrix Electronics and suitable for server power sequencing, ASIC supervisory monitoring, automotive ADAS domain controllers, and industrial PLC power management requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX16061BTP+ 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 demanding industrial, automotive, and computing applications - emphasizing accuracy, reliability, and integration.

The MAX16060/MAX16061/MAX16062 family was engineered specifically for multivoltage system supervision, delivering high-accuracy rail monitoring, flexible configuration, and robust fault-handling features in compact packages.

FAQ

What voltage rails does the MAX16061BTP+ monitor, and how are they configured?

The MAX16061BTP+ monitors six voltage rails: IN1 is factory-set to 3.3V, IN4 to 1.8V, and IN2, IN3, IN5, IN6 are adjustable (0.373V at TOL = VCC or 0.394V at TOL = GND). This B-variant configuration supports custom low-voltage domains while retaining standard 3.3V/1.8V references - enabling precise supervision of heterogeneous ASIC or FPGA power architectures without external resistor dividers.

Does the MAX16061BTP+ require external pullup resistors on its outputs?

No, the MAX16061BTP+ does not require external pullup resistors on its six OUT_ pins or RESET pin because each features an internal 30µA pullup to VCC. This eliminates seven external components, reducing BOM cost and PCB area. However, if interfacing with logic running at voltages other than VCC (e.g., 1.2V or 5V), an external pullup to that voltage may be used - the device prevents reverse current flow into VCC.

How is the reset timeout period set on the MAX16061BTP+?

The reset timeout on the MAX16061BTP+ is set via the SRT pin: connecting SRT to VCC selects the internal minimum timeout of 140ms, while connecting an external capacitor from SRT to GND adjusts the timeout using t_RP = 2.06 × 10⁶ Ω × C_SRT (F). For example, a 100nF capacitor yields ~206ms timeout. The timeout remains stable across temperature, with typical variation < ±1% over -40°C to +125°C.

Can the watchdog timer on the MAX16061BTP+ be disabled, and how?

Yes, the watchdog timer on the MAX16061BTP+ is disabled by leaving the WDI pin unconnected. The device uses a 400nA current source to detect the floating state - so WDI must not be connected to any node sourcing or sinking >200nA (e.g., most three-state drivers exceed this). When enabled, the watchdog asserts RESET after 1.12s–2.40s (typ 1.6s) if no edge is detected, with a 54s startup delay to allow firmware initialization.

What is the purpose of the MARGIN pin on the MAX16061BTP+?

The MARGIN pin on the MAX16061BTP+ is an active-low input that forces all six OUT_ outputs and the RESET output into a high (deasserted) state, regardless of actual input voltage conditions - enabling controlled margin testing of power supplies. It locks logic for 50µs after activation, preventing transient glitches during voltage sweeps. This feature is essential for production test automation and validation of supply tolerance margins without altering hardware.