Analog Devices Inc./Maxim Integrated MAX6710BUT

Overview

MAX6710BUT from Maxim Integrated is a precision quad-voltage microprocessor supervisory IC that monitors 5.0V (−5%), 3.3V (−5%), 2.5V (−5%), and one adjustable supply (down to 0.62V) with ±1.5% threshold accuracy, asserting a single active-low open-drain RESET output when any falls below its threshold - used in desktop computers and industrial equipment for reliable power-on reset and brownout protection.

For engineers reviewing the MAX6710BUT datasheet, MAX6710BUT pinout, MAX6710BUT application, or MAX6710BUT equivalent, key selection criteria include factory-trimmed −5% tolerance thresholds for 5V/3.3V/2.5V rails, 140ms minimum reset timeout, 35µA quiescent current, SOT23-6 package compatibility, and immunity to sub-100µs supply transients.

Technical Context

The MAX6710BUT integrates four independent voltage comparators with a shared 0.62V bandgap reference and internal resistor-divider networks for fixed thresholds; each comparator includes 0.3% VTH hysteresis to reject noise without degrading accuracy. Its power architecture uses IN2 as both monitored supply and primary device power source.

Reset assertion is combinatorial across all inputs: RESET goes low within 30µs of any input crossing its threshold downward, remains asserted for ≥140ms after all inputs recover, and stays valid as long as IN1 or IN2 ≥1V - enabling robust operation during partial rail collapse in multi-rail systems.

Key Specifications

Pinout & Package

MAX6710BUT is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), surface-mount, RoHS-compliant, tape-and-reel packaged.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-voltage supervisory applications.

Compared with MAX6710AUT and TPS3307-33D, the MAX6710BUT uniquely delivers −5% precision on all three fixed rails plus one flexible input in a single SOT23-6 package - minimizing footprint while meeting tight-margin modern compute platform requirements without external trimming.

Availability

MAX6710BUT is available at Aetrix Electronics and suitable for desktop computers, industrial PLCs, network switches, and servers/workstations requiring stable component supply, long-term lifecycle support, and guaranteed −5% threshold accuracy across temperature.

Supply support for MAX6710BUT 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 power, sensing, and interface applications - with emphasis on high-reliability, low-power, and small-footprint solutions.

The MAX6700/MAX6710 product line targets compact, multi-rail embedded systems needing integrated voltage supervision - specifically engineered to replace discrete resistor-comparator circuits while improving accuracy and reducing board area.

FAQ

What is the exact reset timeout duration specified for MAX6710BUT?

The MAX6710BUT guarantees a minimum reset timeout period of 140ms after all monitored voltages rise above their thresholds. Typical duration is 200ms, with a maximum of 280ms over temperature. This fixed timeout is internally generated and does not require external capacitors - ensuring consistent reset hold time across all units and operating conditions. The MAX6710BUT implements this via an on-chip timer referenced to its internal bandgap, eliminating variation from external component tolerances.

Can MAX6710BUT monitor a 1.8V supply, and if not, what are the alternatives?

The MAX6710BUT does not natively monitor 1.8V - its fixed thresholds are 5.0V (−5%), 3.3V (−5%), and 2.5V (−5%). However, its IN4 pin supports adjustable monitoring down to 0.62V using an external resistor divider. To supervise 1.8V, connect R1 = 191kΩ and R2 = 100kΩ to yield V_IN4 = 0.62V × (191k + 100k)/100k ≈ 1.8V. The MAX6710BUT maintains ±1.5% accuracy on this derived threshold, making it fully capable of 1.8V supervision with two passive components.

What is the valid operating voltage range for the IN2 pin on MAX6710BUT?

The IN2 pin on MAX6710BUT serves as both the monitored 3.3V (−5%) supply and the device's primary power source, with a valid operating range of 1.2V to 5.5V. Crucially, the RESET output remains functionally valid as long as IN2 ≥1.0V - meaning the MAX6710BUT continues asserting or deasserting RESET correctly even during brownout conditions where IN2 sags from 3.3V down to 1V. This behavior is explicitly guaranteed across −40°C to +85°C.

Does MAX6710BUT require an external pullup resistor on the RESET pin?

No, MAX6710BUT does not require an external pullup resistor on the RESET pin under standard 3.3V logic interfacing. It features a built-in 10µA internal pullup to IN2, sufficient to drive CMOS inputs directly. An external pullup is only needed when interfacing to logic with a different supply voltage (e.g., 5V or 1.8V), in which case a resistor to that voltage rail overrides the internal pullup without reverse current flow - protected by internal circuitry per the datasheet.

How does MAX6710BUT handle short-duration supply transients on monitored inputs?

The MAX6710BUT is specifically designed to ignore short supply transients: it remains immune to IN_ voltage dips lasting less than ~100µs when the overdrive is ≤50mV below threshold - as confirmed in Figure MAX6700 toc04. This immunity stems from internal filtering and comparator hysteresis (0.3% of VTH), preventing false resets from switching noise or coupling spikes. No external RC filtering is required for typical digital system noise environments.