Analog Devices Inc./Maxim Integrated MAX6347XR46+T

Overview

The MAX6347XR46+T 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 events. It features a factory-trimmed 4.63V reset threshold (±2.5% over -40°C to +85°C), 100ms minimum reset timeout, ultra-low 1µA max supply current, and operates down to 1.2V VCC. It is used in portable battery-powered equipment requiring reliable, low-power reset supervision.

For engineers reviewing the MAX6347XR46+T datasheet, MAX6347XR46+T pinout, MAX6347XR46+T application, or MAX6347XR46+T equivalent, key selection criteria include active-high push-pull output compatibility with µP reset inputs, SC70-3 package footprint constraints, 4.63V threshold accuracy across temperature, and immunity to sub-200µs VCC transients at 100mV overdrive.

Technical Context

The MAX6347XR46+T implements a precision bandgap-based voltage comparator with hysteresis (9.5mV) to detect VCC falling below its 4.63V threshold. Its internal timing circuit guarantees ≥100ms reset assertion after VCC recovers above threshold, independent of supply ramp rate.

It uses a push-pull output stage capable of sourcing ≥500µA at 0.8·VCC while asserted, and sinking ≤0.4V at 1.2mA when deasserted - enabling direct interface with µP reset pins without external pull-up resistors.

Key Specifications

Pinout & Package

MAX6347XR46+T is housed in a 3-pin SC70-3 package (2.0mm × 2.1mm, 0.65mm pitch), compatible with reflow soldering and suitable for high-density portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3+T and TPS3808G33DBVR, the MAX6347XR46+T delivers exact 4.63V threshold accuracy in SC70-3 with active-high push-pull output - eliminating external components and PCB layout changes required by alternatives.

Availability

MAX6347XR46+T is available at Aetrix Electronics and suitable for battery-powered IoT sensor nodes, industrial PLC I/O modules, medical wearable monitors, and automotive body control modules requiring stable component supply across long production lifecycles.

Supply support for MAX6347XR46+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, medical, communications, and consumer applications.

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

FAQ

What is the exact reset threshold voltage of the MAX6347XR46+T and how does it vary with temperature?

The MAX6347XR46+T has a factory-trimmed nominal reset threshold of 4.63V. At +25°C, this is guaranteed within ±1.5% (4.56V to 4.70V). Over the full operating temperature range of -40°C to +85°C, the threshold remains within ±2.5% (4.51V to 4.75V), as specified in the Electrical Characteristics table. This tight tolerance eliminates need for external calibration in production.

Does the MAX6347XR46+T require an external pull-up resistor on its RESET pin?

No, the MAX6347XR46+T does not require an external pull-up resistor. Its RESET pin is an active-high push-pull output capable of sourcing ≥500µA at 0.8·VCC when asserted and sinking ≤0.4V at 1.2mA when deasserted. This allows direct connection to the reset input of most microprocessors without additional components - a key advantage over open-drain alternatives like the MAX6348.

What is the minimum VCC voltage at which the MAX6347XR46+T remains fully functional?

The MAX6347XR46+T is fully specified to operate down to 1.2V VCC over the full -40°C to +85°C temperature range. Below 1.2V, the device may not guarantee correct reset state or timing. This low-voltage capability enables reliable brownout detection in systems where the supply rail collapses gradually, such as during battery discharge in portable equipment.

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

The MAX6347XR46+T incorporates internal filtering and comparator hysteresis (9.5mV) to reject fast VCC transients. According to the Typical Operating Characteristics graph "Maximum Transient Duration vs. Reset Threshold Overdrive", it ignores negative-going glitches shorter than ~200µs when VCC dips 100mV below the 4.63V threshold - preventing spurious resets caused by digital switching noise or EMI coupling onto the supply rail.

Is the MAX6347XR46+T pin-compatible with the MAX809 series?

Yes, the MAX6347XR46+T in SC70-3 package is pin-compatible with the MAX809 series in the same package - both use identical 3-pin pinout (VCC, RESET, GND) and share the same land pattern. However, note that MAX809 variants are active-low, whereas MAX6347XR46+T is active-high push-pull; thus, direct substitution requires verification of reset polarity compatibility in the target system.