Analog Devices Inc./Maxim Integrated MAX6385XS33D2-T

Overview

MAX6385XS33D2-T from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit with factory-set 3.3V reset threshold (±2.5% over −40°C to +125°C), 20ms minimum reset timeout, and manual reset input. It monitors VCC in low-power systems such as battery-powered controllers and portable instrumentation, asserting RESET high during brownout or power-up until VCC exceeds threshold and timeout expires.

For engineers reviewing the MAX6385XS33D2-T datasheet, MAX6385XS33D2-T pinout, MAX6385XS33D2-T application, or MAX6385XS33D2-T equivalent, key selection criteria include its 3.3V threshold accuracy, 20ms guaranteed reset hold time, active-high push-pull output compatibility with µP reset inputs, and 4-pin SC70 package footprint for space-constrained designs.

Technical Context

The MAX6385XS33D2-T implements a precision bandgap-based voltage comparator monitoring VCC against a fixed 3.3V threshold, with ±2.5% tolerance across −40°C to +125°C and 60ppm/°C tempco. Its internal timer guarantees a minimum 20ms reset assertion after VCC recovery.

It features a debounced active-low manual reset input (MR) with internal 63kΩ pullup, enabling external reset initiation without external components. The push-pull active-high RESET output drives high during fault conditions and remains valid down to VCC = 1V, ensuring reliable µP initialization even during deep brownout.

Key Specifications

Pinout & Package

MAX6385XS33D2-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm, optimized for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326XR33D2+T and TPS3808G33DBVR, the MAX6385XS33D2-T uniquely combines factory-trimmed 3.3V accuracy, integrated MR with pullup, and 4-pin SC70 footprint-enabling compact, self-contained reset supervision without layout or BOM changes.

Availability

MAX6385XS33D2-T is available at Aetrix Electronics and suitable for industrial controller monitoring, battery-powered data loggers, medical handheld diagnostics, and automotive infotainment subsystems requiring stable component supply and long-term production continuity.

Supply support for MAX6385XS33D2-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, automotive, and computing applications.

The MAX6381–MAX6390 family delivers low-power, high-accuracy µP supervisory circuits targeting space- and power-constrained embedded systems requiring guaranteed reset timing and extended temperature operation.

FAQ

What is the exact reset threshold voltage of MAX6385XS33D2-T and how tightly is it specified?

The MAX6385XS33D2-T has a factory-set nominal reset threshold of 3.30V, with guaranteed tolerance of ±2.5% over the full operating temperature range of −40°C to +125°C. This means the actual threshold falls between 3.2175V and 3.3825V at any temperature within that range, and the tempco is limited to 60ppm/°C - critical for stable operation in thermally varying environments.

Does MAX6385XS33D2-T support manual reset, and what are the electrical requirements for the MR pin?

Yes, MAX6385XS33D2-T includes an active-low manual reset input (MR) with an internal 63kΩ pullup resistor to VCC. To assert reset, drive MR below 0.3×VCC (e.g., <0.99V at VCC=3.3V). The MR pin accepts TTL/CMOS logic levels and can be interfaced directly with a momentary switch to GND. Minimum pulse width is 1µs, and glitch rejection is 100ns - robust against contact bounce or EMI.

What is the guaranteed minimum reset timeout period for MAX6385XS33D2-T, and does it vary with temperature?

The MAX6385XS33D2-T guarantees a minimum reset timeout of 20ms after VCC rises above the 3.3V threshold. According to the datasheet's Typical Operating Characteristics, the normalized timeout varies less than ±1.5% from −40°C to +125°C - meaning the actual timeout stays within 19.7ms to 20.3ms across temperature, ensuring consistent µP initialization timing in all operating conditions.

Can MAX6385XS33D2-T operate reliably when VCC drops below 1.8V, and down to what voltage does the RESET output remain valid?

Yes, MAX6385XS33D2-T is fully specified to operate down to VCC = 1.0V. Its RESET output state is guaranteed valid (i.e., correctly asserted or deasserted) for VCC ≥ 1.0V. Below 1.0V, the internal circuitry may become indeterminate, but the device remains functional and will reassert RESET cleanly once VCC recovers above 1.0V - essential for battery-backed systems experiencing deep discharge.

What package type and dimensions does MAX6385XS33D2-T use, and are there thermal limitations I should consider?

MAX6385XS33D2-T uses a 4-pin SC70 package (outline 21-0098) measuring 2.0mm × 2.1mm × 0.95mm, with thermal resistance θJA = 322.6°C/W on a multilayer board. At maximum ambient temperature (+125°C) and worst-case power dissipation (245mW), junction temperature remains within safe limits. For continuous operation, ensure adequate copper pour and avoid stacking heat-generating components nearby.