Analog Devices Inc./Maxim Integrated MAX6348XR36-T

Overview

MAX6348XR36-T from Maxim Integrated is an open-drain, active-low microprocessor supervisory circuit designed to monitor 3.6V power supplies in embedded systems. It asserts reset when VCC falls below 3.60V ±2.5% over temperature, maintains reset for ≥100ms after VCC recovery, draws ≤1µA supply current at 3.3V, and operates from 1.2V to 5.5V across –40°C to +85°C - used in portable battery-powered µP systems requiring reliable brownout protection.

For engineers reviewing the MAX6348XR36-T datasheet, MAX6348XR36-T pinout, MAX6348XR36-T application, or MAX6348XR36-T equivalent, this page delivers verified reset threshold accuracy, open-drain output behavior, SC70-3 package compatibility, ultra-low quiescent current, and transient immunity specifications critical for power-monitoring circuit design and BOM validation.

Technical Context

The MAX6348XR36-T implements a precision bandgap-based reset comparator with factory-trimmed 3.60V threshold (±1.5% at +25°C, ±2.5% over –40°C to +85°C) and 9.5mV hysteresis. Its open-drain RESET output requires an external pull-up and supports bidirectional µP reset interfaces like the Motorola 68HC11.

It features immunity to fast VCC transients (up to 100V/µs slew rate), guarantees correct state down to 1.2V VCC, and provides a minimum 100ms power-up reset timeout - all without external components. The device is fully specified for industrial temperature operation and RoHS-compliant packaging.

Key Specifications

Pinout & Package

MAX6348XR36-T is housed in a 3-pin SC70-3 package (outline X3-2), with 0.65mm pitch, 0.9mm max height, and RoHS-compliant lead-free construction (marked "FZCA" on top).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6348XR36-T, MAX6328XR36-T sacrifices industrial temperature support for lower cost, while TPS3808G33DBVR offers higher ICC and fixed 3.3V threshold in a non-pin-compatible SOT23-3 layout - making MAX6348XR36-T the sole choice for open-drain 3.6V supervision in –40°C to +85°C designs.

Availability

MAX6348XR36-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, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for MAX6348XR36-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 high-performance analog and mixed-signal ICs for industrial, communications, computing, and consumer applications - emphasizing integration, reliability, and low-power operation.

The MAX63xx family delivers ultra-low-power, single-function µP supervisors targeting space- and energy-constrained embedded systems where deterministic reset behavior and minimal external components are mandatory.

FAQ

What is the exact reset threshold voltage of MAX6348XR36-T and how does it vary with temperature?

The MAX6348XR36-T has a nominal reset threshold of 3.60V, with ±1.5% tolerance at +25°C and ±2.5% over the full –40°C to +85°C operating range. Its temperature coefficient is 40ppm/°C, meaning threshold drift is bounded and predictable - critical for systems where supply margin must be maintained across environmental extremes. This specification is guaranteed and production-tested per Maxim's datasheet.

Does MAX6348XR36-T require any external components to function?

No, MAX6348XR36-T operates autonomously with no external components required. It integrates the voltage reference, comparator, timer, and output driver. Only an external pull-up resistor on the open-drain RESET pin is needed for proper logic-level translation - typically 4.7kΩ to 10kΩ - making MAX6348XR36-T a true single-component solution for µP reset supervision.

Can MAX6348XR36-T be used with microcontrollers that have bidirectional reset pins?

Yes, MAX6348XR36-T is specifically optimized for bidirectional reset interfaces. Its open-drain RESET output allows seamless wired-OR connection with µPs like the Motorola 68HC11, where either the supervisor or the µP itself can assert reset. This eliminates level-shifting complexity and supports shared reset busing - a key advantage confirmed in Maxim's Applications Information section.

What is the maximum VCC slew rate MAX6348XR36-T can tolerate without generating false resets?

MAX6348XR36-T is rated for VCC slew rates up to 100V/µs without false triggering. This transient immunity is validated in the Absolute Maximum Ratings and Typical Operating Characteristics (Figure MAX6326 toc04), ensuring robust operation in noisy switch-mode power supply environments - a design strength explicitly documented for MAX6348XR36-T in its datasheet.

Is MAX6348XR36-T pin-compatible with legacy Maxim reset ICs like MAX809?

Yes, MAX6348XR36-T is pin-compatible with MAX809, MAX803, and MAX810 in the same SC70-3 package. Pin 1 = GND, Pin 2 = RESET (open-drain), Pin 3 = VCC matches the footprint and signal mapping - enabling direct replacement in existing designs without layout changes, provided the 3.6V threshold and open-drain behavior meet system requirements.