Analog Devices Inc./Maxim Integrated MAX6385XS36D3-T

Overview

MAX6385XS36D3-T from Maxim Integrated is a precision active-high push-pull μP supervisory circuit designed for reliable power-on reset and brownout detection in low-voltage embedded systems. It features a factory-set 3.60V reset threshold (±2.5% over -40°C to +125°C), 140ms minimum VCC reset timeout, 3μA supply current at 1.8V, and guaranteed valid reset output down to VCC = 1V. It is used in portable battery-powered equipment requiring stable, low-power reset assertion during voltage transients.

For engineers reviewing the MAX6385XS36D3-T datasheet, MAX6385XS36D3-T pinout, MAX6385XS36D3-T application, or MAX6385XS36D3-T equivalent, key selection criteria include its active-high push-pull output configuration, manual reset input with internal pullup, 4-pin SC70 package, and compatibility with dual-voltage monitoring systems where auxiliary reset inputs are not required.

Technical Context

The MAX6385XS36D3-T implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy across temperature, coupled to a monolithic timer that enforces a fixed 140ms minimum reset assertion period after VCC recovery. Its MR input includes a 63kΩ internal pullup resistor and supports TTL/CMOS logic levels, enabling direct switch or microcontroller-driven reset initiation without external components.

This device operates within a 1.0V to 5.5V supply range and guarantees correct RESET logic state down to VCC = 1V - critical for fail-safe behavior during deep brownout conditions. It exhibits immunity to negative-going VCC transients up to 100mV overdrive for durations under ~10µs, as characterized in the transient rejection curve.

Key Specifications

Pinout & Package

MAX6385XS36D3-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098), measuring 2.0mm × 2.1mm × 0.95mm, with thermal resistance θ_JA = 322.6°C/W on multilayer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326XR36D3+T and TPS3808G33DBVR, the MAX6385XS36D3-T uniquely delivers active-high push-pull drive at 3.60V threshold with minimal external components - simplifying interface design for modern 3.3V/3.6V microcontrollers requiring high-true reset signaling without pull resistors.

Availability

MAX6385XS36D3-T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, industrial microcontroller supervision, and automotive body control modules requiring stable component supply and long-term lifecycle support.

Supply support for MAX6385XS36D3-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 power, sensing, and connectivity applications in industrial, automotive, and medical markets.

The MAX6381–MAX6390 family delivers single-supply, low-power μP supervisory circuits optimized for reliable reset generation in space-constrained, battery-sensitive, and thermally demanding embedded systems.

FAQ

What is the exact reset threshold voltage of MAX6385XS36D3-T and how stable is it over temperature?

The MAX6385XS36D3-T has a factory-set nominal reset threshold of 3.60V, with guaranteed accuracy of ±2.5% over the full operating temperature range of -40°C to +125°C. This stability is achieved through laser-trimmed bandgap references and matched transistor ratios in the BiCMOS process, ensuring consistent brownout detection across automotive and industrial environments without external calibration.

Does MAX6385XS36D3-T support manual reset functionality, and what is the internal pullup value?

Yes, MAX6385XS36D3-T includes an active-low manual reset input (MR) with a confirmed internal pullup resistor of 63kΩ to VCC. This allows direct connection of a normally open momentary switch between MR and GND, eliminating the need for an external pullup resistor and reducing BOM cost and PCB footprint in compact designs.

What package type and dimensions does MAX6385XS36D3-T use, and is it RoHS-compliant?

MAX6385XS36D3-T uses a 4-pin SC70 package (outline 21-0098), measuring 2.0mm × 2.1mm × 0.95mm, with lead (Pb)-free/RoHS-compliant finish indicated by the "+" suffix in the part number. The land pattern number is 90-0187, and thermal resistance is θ_JA = 322.6°C/W on a multilayer board.

Can MAX6385XS36D3-T operate reliably at very low supply voltages, and what is the minimum functional VCC?

Yes, MAX6385XS36D3-T guarantees correct RESET output logic state down to VCC = 1.0V, as specified in Absolute Maximum Ratings and Electrical Characteristics. This ensures fail-safe reset assertion during deep brownout conditions common in battery-depleted or poorly regulated systems, unlike many competitors that cease valid operation below 1.5V.

How does the reset timeout behavior differ between power-on and manual reset events for MAX6385XS36D3-T?

For MAX6385XS36D3-T, both VCC power-up recovery and MR release trigger the same 140ms minimum reset timeout period. Unlike the MAX6390 variant, this part does not implement separate VCC and MR timeout durations - the D3 suffix denotes a single 140ms timer applied to all reset sources, simplifying timing analysis in deterministic boot sequences.