Analog Devices Inc./Maxim Integrated MAX6826SUT

Overview

MAX6826SUT from Maxim Integrated is a dual ultra-low-voltage microprocessor supervisory circuit in SOT23-6 package, monitoring primary supply (VCC) from +1.8V to +5.0V and user-adjustable secondary input (RESET IN) down to +0.63V, with 140ms minimum reset timeout, manual reset input (MR), and watchdog timer (WDI). It ensures reliable µP reset during power-up, brownout, and software fault conditions in portable and multivoltage embedded systems.

For engineers reviewing the MAX6826SUT datasheet, MAX6826SUT pinout, MAX6826SUT application, or MAX6826SUT equivalent, this page delivers verified electrical parameters, exact SOT23-6 terminal mapping, confirmed dual-supply monitoring capability, reset output behavior (push-pull active-low), and real-world selection guidance against functionally comparable alternatives.

Technical Context

The MAX6826SUT integrates two independent voltage monitors: one factory-set for VCC (threshold determined by suffix 'S' = 2.93V nominal), and a high-impedance RESET IN comparator with 0.63V internal reference, enabling user-defined secondary voltage monitoring via external resistor divider. Its push-pull active-low RESET output asserts when VCC falls below threshold, MR is pulled low, or WDI fails to toggle within 1.6s.

Internal circuitry guarantees valid reset assertion down to VCC = +1.0V, includes 50kΩ internal MR pullup, rejects <100ns glitches on MR, and features temperature-stable reset thresholds (60ppm/°C) with 2×VTH hysteresis. The watchdog timer clears on any WDI edge, MR assertion, or RESET activation - not just periodic toggling.

Key Specifications

Pinout & Package

MAX6826SUT is housed in a 6-pin SOT23-6 package (JEDEC MO-178AA), footprint-compatible with industry-standard 2.9mm × 1.6mm × 1.1mm outline, suitable for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisory applications.

Compared with MAX6826SUT, MAX6326US29D3+ reduces functionality (no WDI, no RESET IN) but saves board area; TPS3808G33DBVR offers lower cost for single-rail use but requires external components and lacks manual reset - MAX6826SUT uniquely balances dual monitoring, watchdog, and push-pull drive in one SOT23-6 device.

Availability

MAX6826SUT is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, and intelligent instruments requiring stable component supply with guaranteed -40°C to +125°C operation and long-term production continuity.

Supply support for MAX6826SUT 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and computing applications.

The MAX6826–MAX6831 family was designed specifically for multivoltage embedded systems requiring simultaneous monitoring of primary and secondary rails with integrated watchdog and manual reset - targeting space-constrained, battery-sensitive, and thermally demanding applications.

FAQ

What is the exact reset threshold voltage for MAX6826SUT?

The MAX6826SUT has a factory-trimmed VCC reset threshold of 2.93V (nominal), with tolerance of ±3% over the full operating temperature range (-40°C to +125°C). This value corresponds to the 'S' suffix in the part number and is specified in the Electrical Characteristics table under VTH for MAX68__S. The RESET IN pin uses a fixed 0.63V internal reference, adjustable upward via external resistor divider.

Does MAX6826SUT support open-drain reset output?

No, MAX6826SUT does not support open-drain reset output. It features a push-pull active-low RESET output (Pin 1), capable of both sinking and sourcing current. Open-drain variants in the same family include MAX6828 and MAX6831; MAX6826SUT's output drives low actively and returns high via internal sourcing (VOH ≥ 0.8×VCC when not asserted).

Can MAX6826SUT monitor a 1.2V supply rail?

Yes, MAX6826SUT can monitor a 1.2V supply using its RESET IN pin. Since the internal reference is 0.63V, a simple resistor divider (e.g., R1 = R2 = 100kΩ) scales the 1.2V rail to ~0.6V at RESET IN - triggering reset when the rail drops below ~1.14V (accounting for hysteresis). The device's guaranteed operation down to VCC = +1.0V ensures reliability even during partial power loss.

What is the watchdog timeout period for MAX6826SUT?

The watchdog timeout period for MAX6826SUT is 1.6 seconds nominal, with a specified range of 0.8s to 2.6s over temperature (-40°C to +125°C). The timer resets on any rising or falling edge at the WDI pin (Pin 4), and also clears automatically during MR assertion or RESET activation - making it robust against software hangs without requiring precise pulse timing.

Is MAX6826SUT compatible with 1.8V microcontrollers?

Yes, MAX6826SUT is fully compatible with 1.8V microcontrollers. Its VCC operating range starts at +1.2V, and its push-pull RESET output achieves VOH ≥ 0.8×VCC and VOL ≤ 0.3V when sinking 100µA - ensuring clean logic-high and logic-low levels into 1.8V µP reset inputs. MR and WDI accept 0.3×VCC/0.7×VCC logic thresholds, matching standard CMOS levels.