Analog Devices Inc./Maxim Integrated MAX6347XR46+

Overview

MAX6347XR46+ from Maxim Integrated is an active-high push-pull microprocessor supervisory circuit designed to monitor 4.63V power supplies and assert a reset signal during brownout, power-up, and power-down conditions. It features a factory-trimmed 4.63V reset threshold (±1.5% at +25°C), 100ms minimum reset timeout, ultra-low 1µA max supply current, and guaranteed operation down to VCC = 1V. It is used in portable battery-powered systems requiring reliable, low-power supply monitoring.

For engineers reviewing the MAX6347XR46+ datasheet, MAX6347XR46+ pinout, MAX6347XR46+ application, or MAX6347XR46+ equivalent, this page delivers verified technical context, pin-level design meaning, real-world use scenarios, and validated alternative options for industrial and embedded µP reset management.

Technical Context

The MAX6347XR46+ implements a precision bandgap-based voltage comparator with hysteresis (9.5mV typical) to detect VCC falling below its 4.63V threshold. Its internal reset timer guarantees ≥100ms assertion after VCC rises above threshold, independent of temperature (-40°C to +85°C).

It uses a push-pull output stage capable of sourcing 500µA at VOH ≥ 0.8·VCC and sinking 3.2mA at VOL ≤ 0.4V, eliminating external pull-up components. The device ignores fast transients on VCC-up to 200µs for 200mV overdrive-as confirmed by its transient immunity characterization.

Key Specifications

Pinout & Package

MAX6347XR46+ is housed in a 3-pin SC70 package (2.0mm × 2.1mm × 0.9mm), optimized for space-constrained portable designs. Pin assignments are identical across MAX6326–MAX6348 family members in SC70/SOT23 formats.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6347XR46+, MAX6327XR46+ offers identical functionality and drop-in compatibility, while TPS3124E18DBVR trades lower VCC minimum for higher quiescent current and open-drain constraints-making MAX6347XR46+ optimal for space- and power-critical active-high reset applications.

Availability

MAX6347XR46+ is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, industrial PLC I/O modules, smart energy meters, and critical µP power monitoring requiring stable component supply across extended temperature ranges.

Supply support for MAX6347XR46+ 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, automotive, and computing markets.

The MAX6326–MAX6348 family was designed specifically for ultra-low-power, precision reset supervision in battery-operated and thermally demanding embedded systems-emphasizing minimal footprint, guaranteed timing, and robust noise immunity.

FAQ

What is the exact reset threshold voltage of MAX6347XR46+ and how tightly is it specified?

The MAX6347XR46+ has a factory-trimmed reset threshold of 4.63V, with a tolerance of ±1.5% at +25°C and ±2.5% over the full -40°C to +85°C operating range. This value is laser-trimmed during production and documented in the Electrical Characteristics table of the official datasheet. The 4.63V point corresponds to the "R46" suffix in the part number and is one of 21 standard thresholds offered across the MAX6326–MAX6348 family.

Does MAX6347XR46+ require any external components to function?

No, MAX6347XR46+ requires no external components. Its precision voltage reference, comparator, timer, and push-pull output driver are fully integrated. Unlike open-drain reset supervisors, MAX6347XR46+ does not need an external pull-up resistor. The only connections needed are VCC, GND, and the RESET output tied directly to the microprocessor's reset input.

What is the minimum VCC voltage at which MAX6347XR46+ remains functional and asserts reset correctly?

MAX6347XR46+ is guaranteed to operate correctly and assert reset down to VCC = 1.0V. This ensures reliable brownout detection even during deep discharge of backup capacitors or batteries. The internal circuitry-including the bandgap reference and output driver-remains fully functional and meets all specifications (including reset timeout and threshold accuracy) across the entire 1.0V to 5.5V supply range.

How does MAX6347XR46+ handle fast voltage transients on the VCC line?

MAX6347XR46+ rejects fast negative-going transients on VCC via internal filtering and comparator hysteresis. As shown in the Typical Operating Characteristics graph "Maximum Transient Duration vs. Reset Threshold Overdrive", it ignores transients ≤200µs wide when the overdrive (VTH – VCC) is 200mV. This immunity prevents false resets caused by switching noise, ESD, or load-dump events in automotive and industrial environments.

Is MAX6347XR46+ pin-compatible with other reset ICs such as MAX809 or MAX810?

Yes, MAX6347XR46+ is pin-compatible with MAX803, MAX809, and MAX810 in both SC70-3 and SOT23-3 packages. All share identical 3-pin topologies (VCC, RESET, GND), same pinout orientation, and compatible output drive strength. However, note that MAX809/MAX810 offer only active-low outputs, whereas MAX6347XR46+ provides active-high push-pull-requiring verification of µP reset polarity in the target system.