Analog Devices Inc./Maxim Integrated MAX6347XR44+T

Overview

MAX6347XR44+T from Maxim Integrated is an active-high push-pull microprocessor supervisory circuit that monitors VCC supply voltage and asserts a reset signal when voltage falls below 4.38V, maintaining reset for ≥100ms after recovery; it operates from 1.2V to 5.5V over –40°C to +85°C and draws ≤1µA supply current, enabling reliable power-on reset in battery-powered embedded controllers.

For engineers reviewing the MAX6347XR44+T datasheet, MAX6347XR44+T pinout, MAX6347XR44+T application, or MAX6347XR44+T equivalent, key selection criteria include its factory-trimmed 4.38V reset threshold, active-high push-pull output, SC70-3 package, ultra-low 1µA supply current, and guaranteed operation down to 1.2V VCC - critical for portable µP systems requiring precise brownout detection without external components.

Technical Context

The MAX6347XR44+T implements a precision bandgap-based reset comparator with ±1.5% (25°C) and ±2.5% (–40°C to +85°C) threshold accuracy, 40ppm/°C tempco, and built-in hysteresis of 9.5mV to prevent chatter during threshold crossing. Its internal timing circuit ensures a minimum 100ms reset timeout after power-up or brownout recovery.

Designed for direct interface with microcontrollers lacking dedicated reset supervision, the device features push-pull output capable of sourcing ≥500µA at 0.8·VCC while asserted, and sinking up to 1.2mA when deasserted - eliminating need for external pull-up resistors unlike open-drain variants.

Key Specifications

Pinout & Package

MAX6347XR44+T is housed in a 3-pin SC70-3 package (outline 21-0075), measuring 2.0mm × 2.1mm × 0.95mm, with gull-wing leads and RoHS-compliant lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6347XR44+T, MAX6327XR44+T offers identical functionality and pinout but reflects older product family branding, while TPS3808G33DBVR differs fundamentally in output polarity, threshold value, and drive architecture - necessitating schematic and firmware changes for substitution.

Availability

MAX6347XR44+T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, smart energy meters, automotive body control modules, and battery-powered IoT edge nodes requiring stable component supply with guaranteed long-term continuity.

Supply support for MAX6347XR44+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, designs precision analog and mixed-signal ICs for industrial, communications, computing, and consumer applications.

The MAX63xx family was engineered specifically for ultra-low-power microprocessor reset supervision in space-constrained, battery-sensitive systems - prioritizing sub-µA quiescent current, factory-trimmed voltage thresholds, and minimal external component requirements.

FAQ

What is the exact reset threshold voltage of the MAX6347XR44+T?

The MAX6347XR44+T has a factory-trimmed nominal reset threshold of 4.38V, with tolerance of ±1.5% at +25°C and ±2.5% over the full –40°C to +85°C operating range. This value is confirmed in Table 1 of the official datasheet and corresponds to the "R44" suffix in the part number. The MAX6347XR44+T uses this precise threshold to initiate reset when VCC drops below 4.38V, ensuring compatibility with 4.5V nominal rails.

Does the MAX6347XR44+T require any external components to function?

No, the MAX6347XR44+T requires no external components to perform its core reset supervision function. Its internal precision voltage reference, comparator, and timing circuit eliminate the need for external resistors, capacitors, or trimming. The MAX6347XR44+T operates as a fully self-contained reset generator in 3-pin SC70-3 packaging, making it ideal for space-constrained designs where BOM simplification is critical.

What is the output configuration of the MAX6347XR44+T and how does it interface with a microprocessor?

The MAX6347XR44+T features an active-high push-pull RESET output (Pin 2), meaning it actively drives the output high during reset assertion and low when deasserted. This allows direct connection to standard µP reset inputs without external pull-up resistors. Unlike open-drain variants, the MAX6347XR44+T's push-pull structure ensures defined logic levels at all times, simplifying timing analysis and improving noise immunity in the MAX6347XR44+T application.

What is the supply current consumption of the MAX6347XR44+T across temperature and voltage?

The MAX6347XR44+T consumes ≤1.0µA typical supply current at +25°C and 3V, with maximum specified at 1.75µA at 5.5V. Over temperature (–40°C to +85°C), supply current remains ultra-low, staying well under 2µA across its full 1.2V–5.5V VCC range. This consistent sub-µA performance makes the MAX6347XR44+T especially suitable for always-on battery-powered systems where leakage current directly impacts service life.

Is the MAX6347XR44+T pin-compatible with other devices in the MAX63xx family?

Yes, the MAX6347XR44+T is pin-compatible with all members of the MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348 family in the same SC70-3 or SOT23-3 package, including MAX6327XR44+T and MAX6347UR44+T. All share identical 3-pin pinout (VCC, RESET, GND), allowing direct PCB footprint reuse. However, output polarity differs across subfamilies - the MAX6347XR44+T is active-high push-pull, whereas MAX6346 variants are active-low, so firmware and schematic review is required before substitution.