Analog Devices Inc./Maxim Integrated MAX6829RFUT+

Overview

MAX6829RFUT+ from Maxim Integrated is a dual ultra-low-voltage microprocessor supervisory IC in 6-pin SOT23 package, monitoring primary VCC (factory-trimmed 3.08V threshold) and secondary VCC2 (factory-trimmed 2.313V threshold), with active-low push-pull RESET output, manual reset input (MR), and watchdog timer (1.6s timeout). It ensures reliable µP reset during power-up, brownout, or software hang in portable and multivoltage systems.

For engineers reviewing the MAX6829RFUT+ datasheet, MAX6829RFUT+ pinout, MAX6829RFUT+ application, or MAX6829RFUT+ equivalent, key selection criteria include guaranteed reset validity down to VCC = +1.2V, factory-trimmed dual-voltage thresholds, 140ms minimum reset timeout, immunity to short negative VCC transients, and compatibility with battery-powered embedded controllers requiring stable low-power supervision.

Technical Context

The MAX6829RFUT+ integrates two independent voltage monitors: one for primary supply (VCC) with fixed 3.08V threshold (suffix 'T'), and one for secondary supply (VCC2) with fixed 2.313V threshold (suffix 'Z'). Its internal watchdog timer triggers reset if WDI remains static beyond 1.6s, and MR asserts reset on active-low logic with internal 50kΩ pullup.

Reset assertion occurs when either VCC falls below 3.08V, VCC2 falls below 2.313V, MR is pulled low, or WDI times out. RESET remains asserted for ≥140ms after all conditions clear. The device operates across –40°C to +125°C and draws ≤30µA ICC at full temperature range.

Key Specifications

Pinout & Package

MAX6829RFUT+ uses a 6-pin SOT23 package (U6+1 outline, land pattern 90-0175), RoHS-compliant, with 1.0mm pitch and thermal pad not present. Pin 1 is marked by dot; device orientation follows JEDEC MO-178.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6829RFUT+, MAX6827RFUT+ offers identical dual-monitoring capability but with inverted RESET polarity and different VCC2 threshold, while MAX6316US31D3+T provides only primary-rail supervision in a smaller footprint-neither replicates the integrated 3.3V/2.5V + watchdog feature set of MAX6829RFUT+.

Availability

MAX6829RFUT+ is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, and intelligent instruments requiring stable component supply across automotive (-40°C to +125°C) and industrial temperature ranges.

Supply support for MAX6829RFUT+ 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 connectivity applications, with emphasis on high-reliability, low-power solutions.

The MAX6826–MAX6831 family delivers dual-voltage µP supervision with integrated watchdog and manual reset in minimal SOT23 packaging-targeted specifically at space-constrained, battery-operated, and multirail embedded systems.

FAQ

What is the exact VCC and VCC2 reset threshold voltage for MAX6829RFUT+?

The MAX6829RFUT+ has a factory-trimmed VCC reset threshold of 3.08V (±3% over –40°C to +125°C) and a VCC2 threshold of 2.313V (±3% over same range). These values correspond to the 'T' (3.08V) and 'Z' (2.313V) suffixes in the part number, and are specified in the Electrical Characteristics table of the MAX6826–MAX6831 datasheet. No external calibration is required.

Does MAX6829RFUT+ support active-high RESET output?

No, MAX6829RFUT+ provides only active-low push-pull RESET output. The 'R' in the part number denotes active-low reset, and the functional diagram confirms RESET goes low on fault. For active-high output, consider MAX6827RFUT+ ('S' suffix), which shares the same pinout but outputs high during reset assertion.

Can MAX6829RFUT+ monitor a 1.8V supply instead of 2.5V on VCC2?

No-MAX6829RFUT+ has a fixed 2.313V VCC2 threshold optimized for 2.5V rails. To supervise 1.8V, select MAX6829SFUT+ ('F' suffix, 1.050V VCC2 threshold) or MAX6829YHUT+ ('Y' suffix, 2.188V). The 'Z' suffix in MAX6829RFUT+ is specific to 2.313V and cannot be adjusted externally.

What is the watchdog timeout period for MAX6829RFUT+ and how is it cleared?

The watchdog timeout period for MAX6829RFUT+ is 1.6s nominal (min 1.12s, max 2.4s over –40°C to +85°C). It is cleared by any rising or falling edge on WDI, by assertion of MR, or by RESET output transition. Leaving WDI unconnected disables the watchdog function entirely, as the internal driver resets the timer every ~1.4s.

Is MAX6829RFUT+ pin-compatible with other devices in the MAX6826–MAX6831 family?

Yes-MAX6829RFUT+ shares identical 6-pin SOT23 pinout and footprint with all MAX6826–MAX6831 variants, including MAX6826, MAX6827, MAX6828, MAX6830, and MAX6831. However, functional differences (e.g., RESET polarity, VCC2 presence, watchdog enable) mean electrical compatibility must be verified per application; pinout alone does not guarantee drop-in replacement.