Analog Devices Inc./Maxim Integrated MAX6327XR29-T

Overview

The MAX6327XR29-T from Maxim Integrated is an active-high push-pull microprocessor supervisory circuit designed to monitor VCC supply voltage and assert a reset signal during power-up, brownout, or power-down events. It features a factory-trimmed 2.93V reset threshold (±1.5% at +25°C, ±2.5% over -40°C to +85°C), 100ms minimum reset timeout, ultra-low 1µA max supply current, and guaranteed operation down to 1.2V VCC. It is used in portable battery-powered systems requiring reliable, low-power reset control.

For engineers reviewing the MAX6327XR29-T datasheet, MAX6327XR29-T pinout, MAX6327XR29-T application, or MAX6327XR29-T equivalent, this page provides verified functional specifications, SC70-3 package details, active-high reset behavior, temperature-stable threshold hysteresis (6.3mV), and direct alternatives for µP reset supervision in space-constrained embedded designs.

Technical Context

The MAX6327XR29-T implements a precision bandgap-based voltage comparator with built-in hysteresis (6.3mV) to reject fast VCC transients and prevent false resets. Its internal reset timer guarantees a minimum 100ms active-high reset pulse after VCC rises above 2.93V, extending to 280ms maximum over temperature.

It operates across the full industrial range (-40°C to +85°C) with supply current stable from 0.5µA (typ) to 1.75µA (max at 5.5V), and its push-pull RESET output sources ≥500µA at 0.8·VCC while sinking ≤0.4V at 1.2mA - enabling direct interface with µP reset inputs without external pull-ups.

Key Specifications

Pinout & Package

MAX6327XR29-T is housed in a 3-pin SC70-3 package (outline X3-2, land pattern 90-0208), measuring 2.0mm × 2.1mm × 0.95mm, optimized for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD29+T and TPS3808G33DBVR, the MAX6327XR29-T delivers superior ultra-low-power performance (1µA vs. ≥1.6µA), guaranteed 1.2V operation for robust brownout handling, and push-pull output eliminating external components - making it optimal for battery longevity and layout simplicity in new designs.

Availability

MAX6327XR29-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart metering subsystems, and automotive body control units requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for MAX6327XR29-T 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX6326/MAX6327/MAX6328 family was engineered specifically for ultra-low-power microprocessor reset supervision in battery-critical and space-constrained embedded systems, emphasizing precision threshold accuracy, minimal ICC, and robust transient immunity.

FAQ

What is the exact reset threshold voltage of the MAX6327XR29-T and how tightly is it specified?

The MAX6327XR29-T has a factory-trimmed nominal reset threshold of 2.93V. At +25°C, this is guaranteed within ±1.5% (2.886V to 2.974V). Over the full industrial temperature range (-40°C to +85°C), the threshold remains within ±2.5% (2.857V to 3.000V), as confirmed in the Electrical Characteristics table. This precision eliminates need for external calibration and ensures predictable reset behavior across operating conditions.

Does the MAX6327XR29-T support operation at VCC voltages below 1.8V, and what is the minimum functional supply voltage?

Yes, the MAX6327XR29-T is fully specified down to 1.2V VCC across -40°C to +85°C, with guaranteed correct reset state and comparator functionality. This capability is explicitly stated in the General Description and Absolute Maximum Ratings sections, distinguishing it from many competing supervisors that cease operation below 1.8V - making it suitable for deep brownout detection and ultra-low-voltage backup domains.

What is the output configuration of the MAX6327XR29-T, and how does it differ from the MAX6326 or MAX6328 variants?

The MAX6327XR29-T features an active-high push-pull RESET output, meaning it actively drives high (≥0.8·VCC) when released and low (<0.4V) during reset assertion. This differs from the MAX6326XR29-T (active-low push-pull) and MAX6328XR29-T (active-low open-drain), which require external pull-ups or different µP interface logic. The push-pull design simplifies integration with most modern µPs having dedicated active-high reset inputs.

How long is the reset timeout period of the MAX6327XR29-T, and is it fixed or adjustable?

The MAX6327XR29-T provides a fixed minimum reset timeout of 100ms after VCC rises above the 2.93V threshold, with typical values up to 185ms and a maximum of 280ms over temperature. This timeout is internally generated and non-adjustable - a deliberate design choice to ensure reliable µP initialization without external timing components, as confirmed in the Electrical Characteristics table under "Reset Active Timeout Period".

Is the MAX6327XR29-T pin-compatible with industry-standard supervisory ICs such as the MAX809 series?

Yes, the MAX6327XR29-T in SC70-3 package is pin-compatible with the MAX803/MAX809/MAX810 family in the same 3-pin outline, sharing identical GND–RESET–VCC pin assignments. This compatibility is explicitly noted in the datasheet's Features section and Selector Guide, enabling drop-in replacement in existing layouts where SC70-3 footprint is used - though electrical differences (e.g., lower ICC, deeper VCC range) should be verified per application.