Analog Devices Inc./Maxim Integrated MAX6347XR43-T

Overview

MAX6347XR43-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 drops below 4.30V (±2.5% over temperature), maintaining reset for ≥100ms after recovery; it operates from 1.2V to 5.5V, draws ≤1µA supply current, and is housed in a 3-pin SC70 package for space-constrained embedded systems.

For engineers reviewing the MAX6347XR43-T datasheet, MAX6347XR43-T pinout, MAX6347XR43-T application, or MAX6347XR43-T equivalent, this device serves as a precision, ultra-low-power reset supervisor for battery-powered controllers, portable instrumentation, and critical µP power monitoring where stable threshold accuracy, transient immunity, and guaranteed reset assertion down to 1V are required.

Technical Context

The MAX6347XR43-T implements a factory-trimmed bandgap-based reset comparator with 4.30V nominal threshold (±1.5% at +25°C, ±2.5% over −40°C to +85°C) and 40ppm/°C tempco, ensuring stable trip point across industrial temperature range. Its push-pull output drives high during reset assertion and low otherwise, eliminating need for external pull-up resistors.

It features built-in immunity to fast VCC transients-rejecting negative glitches up to 200µs at 100mV overdrive-and guarantees correct logic state for VCC ≥1V. The reset timeout is internally timed to ≥100ms (min), 185ms (typ), and ≤280ms (max) after VCC rises above threshold.

Key Specifications

Pinout & Package

The MAX6347XR43-T is packaged in a 3-pin SC70-3 (X3-2 outline) surface-mount package, measuring 2.0mm × 2.1mm × 0.95mm, with gull-wing leads and RoHS-compliant lead-free finish (ordered as "+T" suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD2-T and TPS3808G33DBVR, the MAX6347XR43-T delivers precise 4.30V detection with lowest supply current and native push-pull drive-making it optimal for compact, long-life 3.3V/5V systems where threshold accuracy and zero-component interface are critical.

Availability

MAX6347XR43-T is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, smart energy meters, and test & measurement equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6347XR43-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, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX63xx family was engineered specifically for ultra-low-power, high-accuracy microprocessor reset supervision in space- and battery-constrained embedded systems-emphasizing threshold stability, minimal external components, and robust transient rejection.

FAQ

What is the exact reset threshold voltage of the MAX6347XR43-T and how does it vary with temperature?

The MAX6347XR43-T has a nominal reset threshold of 4.30V at +25°C, with tolerance of ±1.5% at room temperature and ±2.5% over the full −40°C to +85°C operating range. Its temperature coefficient is 40ppm/°C, meaning threshold drift is limited to approximately ±10.75mV across the industrial temperature span. This specification is factory-trimmed and guaranteed per the datasheet's Electrical Characteristics table.

Does the MAX6347XR43-T require any external components to function as a reset supervisor?

No, the MAX6347XR43-T requires no external components. Its active-high push-pull output drives directly into a microprocessor's reset pin without needing a pull-up resistor. The internal voltage reference, comparator, and timer are fully integrated. Only VCC, GND, and the RESET output connections are needed-making it a true "single-component" solution for µP reset supervision.

What is the minimum VCC voltage at which the MAX6347XR43-T guarantees correct reset logic state?

The MAX6347XR43-T guarantees correct reset assertion and deassertion behavior for VCC down to 1.2V over temperature (−40°C to +85°C), and functions reliably even at 1.0V at 0°C to +70°C. Below 1.2V, the device remains in a known reset state but may not meet full parametric specifications; this ensures fail-safe behavior during deep brownout conditions common in battery-backed systems.

How does the MAX6347XR43-T handle fast transients on the VCC supply line?

The MAX6347XR43-T incorporates comparator hysteresis and internal filtering to reject fast negative-going VCC transients. Per the Typical Operating Characteristics graph, it ignores glitches ≤200µs wide when the overdrive (VTH − VCC) is 100mV. This immunity prevents spurious resets caused by switching regulator noise or coupling spikes-critical for stable operation in electrically noisy industrial environments.

Is the MAX6347XR43-T pin-compatible with other members of the MAX63xx family or legacy supervisors like the MAX809?

Yes, the MAX6347XR43-T shares identical 3-pin SC70-3 pinout and functionality with all MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348 variants, and is pin-compatible with MAX803/MAX809/MAX810 in SC70/SOT23 packages. Its Pin 1 = GND, Pin 2 = RESET (active-high push-pull), Pin 3 = VCC matches these predecessors exactly-enabling drop-in replacement where 4.30V threshold and push-pull output are appropriate.