Analog Devices Inc./Maxim Integrated MAX6385XS26D7-T

Overview

MAX6385XS26D7-T from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit with factory-set 2.63V reset threshold, 1200ms VCC reset timeout, and manual reset input. It monitors +1.8V to +5.0V supply rails, consumes only 3μA at +1.8V, guarantees valid reset output down to VCC = 1V, and operates across -40°C to +125°C for use in battery-powered industrial controllers.

For engineers reviewing the MAX6385XS26D7-T datasheet, MAX6385XS26D7-T pinout, MAX6385XS26D7-T application, or MAX6385XS26D7-T equivalent, key selection criteria include its active-high push-pull reset output, 2.63V ±2.5% threshold accuracy over temperature, 1200ms minimum VCC timeout, debounced manual reset input with internal 63kΩ pullup, and 4-pin SC70 package compatibility with space-constrained embedded systems.

Technical Context

The MAX6385XS26D7-T implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy over -40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a guaranteed-minimum 1200ms reset assertion after VCC rises above 2.63V, while the MR input triggers a separate 150ms manual reset timeout.

It features an active-high push-pull RESET output capable of sourcing 800µA at VCC ≥ 4.5V (VOH ≥ 0.8×VCC) and sinking 3.2mA (VOL ≤ 0.4V), with guaranteed logic-state validity down to VCC = 1V. The MR input includes internal 63kΩ pullup and accepts TTL/CMOS levels or open-drain signals.

Key Specifications

Pinout & Package

MAX6385XS26D7-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 1.6mm × 1.6mm × 0.95mm with gull-wing leads. Thermal resistance θJA = 322.6°C/W on multilayer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6385XS26D7-T, the MAX6385XS26D4-T offers identical functionality with 80ms shorter VCC timeout-ideal for faster-boot systems-while the TPS3808G33DBVR requires layout changes and provides different threshold/timing, making it a functional alternative only when those parameters align with design constraints.

Availability

MAX6385XS26D7-T is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-powered data loggers, automotive body control modules, and medical point-of-care devices requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6385XS26D7-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 industrial, automotive, communications, and computing markets, emphasizing low power, high reliability, and AEC-Q100 qualification.

The MAX6381–MAX6390 family delivers single/dual low-voltage microprocessor supervisory circuits optimized for space-constrained, battery-sensitive, and thermally demanding applications where guaranteed reset behavior under brownout and transient conditions is critical.

FAQ

What is the exact reset threshold voltage of the MAX6385XS26D7-T?

The MAX6385XS26D7-T has a factory-set reset threshold of 2.63V, specified with ±2.5% accuracy over the full operating temperature range of -40°C to +125°C. This value is confirmed in the Reset Thresholds table of the datasheet, where suffix "26" corresponds to nominal 2.63V. The threshold is trimmed using Maxim's BiCMOS process to ensure stability against voltage and temperature drift.

Does the MAX6385XS26D7-T support manual reset functionality, and how is it implemented?

Yes, the MAX6385XS26D7-T includes a debounced manual reset input (MR) on Pin 3. It features an internal 63kΩ pullup resistor to VCC, allowing direct connection of a normally open momentary switch to GND. When MR is pulled low, the device asserts RESET for a guaranteed minimum 150ms after release. No external debounce components are required due to built-in 100ns glitch rejection.

What is the reset output configuration of the MAX6385XS26D7-T, and why does it matter for system design?

The MAX6385XS26D7-T uses an active-high push-pull RESET output (Pin 2). This means it actively drives the reset line high during fault conditions and pulls it low when deasserted-eliminating the need for an external pullup resistor. This simplifies BOM, improves noise immunity compared to open-drain outputs, and ensures fast, controlled edge rates compatible with modern µP reset inputs.

Can the MAX6385XS26D7-T operate reliably at very low supply voltages?

Yes, the MAX6385XS26D7-T guarantees correct RESET output logic state down to VCC = 1.0V, as stated in the Absolute Maximum Ratings and Electrical Characteristics tables. This ensures deterministic microprocessor behavior during deep brownout or battery-depletion scenarios where other supervisors may enter undefined states, making it suitable for energy-harvesting and long-life battery applications.

What package type and dimensions does the MAX6385XS26D7-T use, and is it RoHS-compliant?

The MAX6385XS26D7-T is supplied in a 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 1.6mm × 1.6mm × 0.95mm with gull-wing leads. The "+" suffix in the part number confirms it is lead(Pb)-free and RoHS-compliant. Thermal resistance is θJA = 322.6°C/W on a multilayer PCB, supporting reliable operation in thermally dense layouts.