Analog Devices Inc./Maxim Integrated MAX6829REUT+

Overview

MAX6829REUT+ from Maxim Integrated is a dual ultra-low-voltage microprocessor supervisory circuit in 6-pin SOT23 package, monitoring primary VCC (factory-trimmed to 2.93V threshold) and secondary VCC2 (factory-trimmed to 2.313V threshold), with manual reset input, watchdog timer (1.6s timeout), and active-low push-pull RESET output - used in portable battery-powered equipment for reliable power-up/brownout detection.

For engineers reviewing the MAX6829REUT+ datasheet, MAX6829REUT+ pinout, MAX6829REUT+ application, or MAX6829REUT+ equivalent, key selection criteria include guaranteed reset validity down to VCC = +1.2V, immunity to short negative VCC transients, no external components required, and factory-trimmed dual-threshold monitoring for multivoltage systems.

Technical Context

The MAX6829REUT+ integrates two independent voltage monitors: one for VCC (threshold = 2.93V, ±30mV over –40°C to +125°C) and one for VCC2 (threshold = 2.313V, ±30mV over same range), both with 60ppm/°C temperature coefficient and 2×VTH hysteresis. It features a 1.6s watchdog timer cleared by WDI edge transitions and a 140ms minimum reset timeout period after supply recovery.

Its push-pull RESET output drives low (≤0.3V at ISINK = 50µA) when triggered and high (≥0.8×VCC at ISOURCE = 200µA) otherwise; MR has internal 50kΩ pullup and accepts CMOS-level inputs; WDI detects ≥50ns pulses and draws ≤160µA when driven high.

Key Specifications

Pinout & Package

MAX6829REUT+ uses a 6-pin SOT23 package (U6+1 outline, land pattern 90-0175), lead-free, rated for –40°C to +125°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6829REUT+, MAX6827REUT+ offers identical dual-threshold monitoring but incompatible active-high reset polarity, while TPS3808G18DBVR omits VCC2 monitoring and watchdog functionality - making MAX6829REUT+ the only option meeting full dual-supply, watchdog, and active-low push-pull requirements in one SOT23 device.

Availability

MAX6829REUT+ is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, intelligent instruments, critical µP monitoring, and multivoltage systems requiring stable component supply across automotive-grade temperature ranges.

Supply support for MAX6829REUT+ 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 focus on high-reliability industrial and medical systems.

The MAX6826–MAX6831 family was designed specifically for space-constrained, multivoltage embedded systems needing deterministic dual-supply supervision, manual reset, and watchdog functionality in minimal footprint.

FAQ

What is the VCC reset threshold voltage for MAX6829REUT+?

The MAX6829REUT+ has a factory-trimmed VCC reset threshold of 2.93V, specified with ±30mV tolerance over the full –40°C to +125°C operating temperature range. This value is fixed by the 'S' suffix in the part number and applies to primary supply monitoring in +2.7V to +3.6V systems. The threshold exhibits 60ppm/°C drift and includes 2×VTH hysteresis to prevent chatter near trip points.

Does MAX6829REUT+ support monitoring a secondary voltage, and what is its threshold?

Yes, MAX6829REUT+ monitors a secondary voltage on the VCC2 pin with a factory-trimmed threshold of 2.313V (±30mV over –40°C to +125°C), corresponding to the 'Z' suffix. This enables simultaneous supervision of I/O or analog rails alongside the primary VCC supply, eliminating need for external resistor dividers or additional supervisor ICs in multivoltage designs.

What type of RESET output does MAX6829REUT+ provide, and how is it configured?

MAX6829REUT+ provides an active-low push-pull RESET output, meaning it actively drives low during reset assertion and actively drives high (≥0.8×VCC) when not asserted. This configuration requires no external pullup resistor and directly interfaces with µP reset pins expecting active-low logic. The output sinks ≥50µA at ≤0.3V and sources ≥200µA at ≥0.8×VCC.

How does the watchdog timer function in MAX6829REUT+?

The MAX6829REUT+ watchdog timer has a nominal timeout period of 1.6s (0.8s–2.6s over temperature). It is cleared by any rising or falling edge on the WDI pin. If WDI remains static beyond this period, RESET asserts for the 140ms minimum timeout. Leaving WDI unconnected disables the watchdog, as internal circuitry services the timer every ~1.4s. Pulse width sensitivity is ≥50ns.

Is MAX6829REUT+ compatible with systems requiring reset assertion down to very low VCC levels?

Yes, MAX6829REUT+ is guaranteed to assert valid RESET down to VCC = +1.2V over –40°C to +125°C, and functional operation is ensured down to +1.0V. This makes it suitable for battery-powered systems experiencing deep brownout conditions, where other supervisors may release reset prematurely. The push-pull output maintains defined logic levels throughout this range.