Analog Devices Inc./Maxim Integrated MAX6348XR35-T

Overview

MAX6348XR35-T from Maxim Integrated is an open-drain, active-low microprocessor supervisory circuit designed to monitor 3.5V power supplies and assert a reset signal during brownout or power-up conditions. It features a factory-trimmed 3.50V reset threshold (±2.5% over -40°C to +85°C), 100ms minimum reset timeout, ultra-low 1µA max supply current at 3V, and operates from 1.2V to 5.5V VCC. It is used in portable battery-powered systems requiring reliable, low-power reset supervision.

For engineers reviewing the MAX6348XR35-T datasheet, MAX6348XR35-T pinout, MAX6348XR35-T application, or MAX6348XR35-T equivalent, key selection criteria include its open-drain RESET output compatibility with bidirectional µP reset pins (e.g., Motorola 68HC11), immunity to fast VCC transients, guaranteed correct state down to 1V VCC, and SC70-3 package suitability for space-constrained designs.

Technical Context

The MAX6348XR35-T implements a precision bandgap-based reset comparator with 9.5mV hysteresis and 40ppm/°C temperature coefficient, ensuring stable threshold behavior across industrial temperature range. Its open-drain RESET output requires an external pull-up and supports wired-OR configurations with other reset sources.

It asserts reset when VCC falls below 3.50V and holds it active for ≥100ms after VCC rises above threshold, with transient immunity validated up to 200µs for 100mV overdrive. The device draws ≤1.0µA at 3V and remains functional down to 1.2V VCC, enabling use in deep-brownout scenarios.

Key Specifications

Pinout & Package

MAX6348XR35-T is housed in a 3-pin SC70-3 package (outline 21-0075), measuring 2.0mm × 2.1mm × 0.9mm, 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 MAX6328XR35-T, MAX6348XR35-T extends temperature qualification and improves long-term stability; compared with TPS3123E18DBVR, it delivers tighter threshold accuracy, lower power, and superior transient rejection for 3.3V infrastructure applications.

Availability

MAX6348XR35-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter communication units, and automotive body control modules requiring stable component supply and long-term lifecycle support.

Supply support for MAX6348XR35-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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX63xx family was designed specifically for ultra-low-power, precision voltage monitoring in microprocessor-based systems where reliability, small size, and minimal external components are critical.

FAQ

What is the exact reset threshold voltage of MAX6348XR35-T and how does it vary with temperature?

The MAX6348XR35-T has a factory-trimmed nominal reset threshold of 3.50V 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, resulting in a maximum deviation of approximately ±17.5mV across the industrial temperature span - sufficient for robust 3.3V system supervision without recalibration.

Does MAX6348XR35-T require any external components to function?

No, MAX6348XR35-T requires no external resistors, capacitors, or trimming components. Its precision threshold is factory-set, and the open-drain RESET output only needs an external pull-up resistor (typically 10kΩ) to a logic rail - a standard passive component not considered a functional "external component" per the datasheet's low-cost design claim.

Can MAX6348XR35-T be used with microcontrollers that have bidirectional reset pins?

Yes, MAX6348XR35-T's open-drain RESET output is explicitly designed for interoperability with bidirectional reset pins such as those found on the Motorola 68HC11. When connected via a single pull-up resistor, either the MAX6348XR35-T or the µC can assert reset - enabling coordinated system-level fault recovery without additional logic.

What is the minimum VCC voltage at which MAX6348XR35-T guarantees correct reset state?

MAX6348XR35-T guarantees correct reset assertion and deassertion behavior down to 1.2V VCC over the full –40°C to +85°C temperature range. This ensures fail-safe operation during deep brownout events, unlike many competitors that specify functionality only above 2.0V or 2.5V.

How does MAX6348XR35-T reject short-duration power supply transients?

MAX6348XR35-T rejects negative-going VCC transients using internal comparator hysteresis (9.5mV) and propagation delay tuning. Per the datasheet's "Maximum Transient Duration vs. Reset Threshold Overdrive" graph, it ignores glitches ≤200µs wide when VCC dips 100mV below threshold - preventing spurious resets in electrically noisy environments like motor drives or switching power supplies.