Analog Devices Inc./Maxim Integrated MAX6385XS35D5-T

Overview

MAX6385XS35D5-T from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit with factory-set 3.50V reset threshold, 280ms minimum VCC reset timeout, and manual reset input. It monitors single-supply voltage (1.0V–5.5V), 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 MAX6385XS35D5-T datasheet, MAX6385XS35D5-T pinout, MAX6385XS35D5-T application, or MAX6385XS35D5-T equivalent, key selection factors include its active-high push-pull reset output, debounced MR input with internal 63kΩ pullup, ±2.5% threshold accuracy over temperature, and 4-pin SC70 package compatibility with space-constrained embedded power monitoring designs.

Technical Context

The MAX6385XS35D5-T implements a precision bandgap-based reset comparator with 60ppm/°C tempco and guarantees reset assertion during VCC brownout, power-up, and negative-going transients up to 35µs (at 100mV overdrive). Its internal timer enforces a fixed 280ms minimum reset timeout after VCC exceeds 3.50V.

It features a dedicated active-low manual reset input (MR) with 1µs minimum pulse width support, 100ns glitch rejection, and 200ns MR-to-RESET delay. The push-pull output drives high during reset assertion and guarantees VOH ≥ 0.8×VCC at ISOURCE = 150µA down to VCC = 1.8V.

Key Specifications

Pinout & Package

MAX6385XS35D5-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, suitable 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 MAX6385XS35D5-T, MAX6326XR35D5+T requires external biasing and lacks MR, while TLV803EB35DBZR offers lower current but no manual reset capability - making MAX6385XS35D5-T optimal for compact, MR-enabled industrial supervisors needing guaranteed 1V operation.

Availability

MAX6385XS35D5-T is available at Aetrix Electronics and suitable for industrial PLCs, battery-powered data loggers, automotive body control units, and medical point-of-care monitors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6385XS35D5-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, and computing applications, with emphasis on low-power, high-reliability solutions.

The MAX6381–MAX6390 family delivers single/dual low-voltage microprocessor supervisory circuits optimized for space-constrained, battery-sensitive systems requiring guaranteed reset behavior across harsh thermal and electrical environments.

FAQ

What is the exact reset threshold voltage of MAX6385XS35D5-T and how tightly is it specified?

The MAX6385XS35D5-T has a factory-set nominal reset threshold of 3.50V, with guaranteed tolerance of ±2.5% over the full operating temperature range (–40°C to +125°C). This means the actual threshold falls between 3.41V and 3.59V at +25°C, and between 3.41V and 3.59V across temperature - ensuring robust detection of 3.3V supply brownout with design margin. The MAX6385XS35D5-T achieves this using laser-trimmed bandgap references and low-drift comparator design.

Does MAX6385XS35D5-T support manual reset, and what are the electrical requirements for the MR pin?

Yes, MAX6385XS35D5-T includes a debounced manual reset input (MR) with an internal 63kΩ pullup resistor to VCC. To assert reset, MR must be driven below 0.3×VCC (e.g., <1.0V at VCC = 3.3V); release occurs when MR rises above 0.7×VCC. It accepts TTL/CMOS logic levels and supports minimum 1µs pulse width with 100ns glitch rejection. The MAX6385XS35D5-T requires no external components for basic switch interfacing.

What is the guaranteed operating voltage range for MAX6385XS35D5-T, and does reset output remain valid at low VCC?

The MAX6385XS35D5-T operates from VCC = 1.0V to 5.5V and guarantees correct reset output logic state down to VCC = 1.0V - unlike many supervisors that fail below 1.8V. Its push-pull output maintains VOH ≥ 0.8×VCC at ISOURCE = 150µA even at 1.8V, and VOL ≤ 0.3V at ISINK = 80µA down to VCC = 1.0V. This ensures deterministic behavior during deep brownout, a critical feature of the MAX6385XS35D5-T.

What package type and footprint does MAX6385XS35D5-T use, and are land patterns available?

MAX6385XS35D5-T uses a 4-pin SC70 package (outline number 21-0098, package code X4+1), measuring 2.0mm × 2.1mm × 0.95mm with 0.65mm pin pitch. Official land pattern 90-0187 is published by Maxim Integrated and compatible with standard reflow profiles. The MAX6385XS35D5-T's small size supports high-density routing in portable and modular electronics where board area is constrained.

How does the 280ms reset timeout of MAX6385XS35D5-T impact system startup timing?

The MAX6385XS35D5-T enforces a minimum 280ms reset timeout after VCC rises above 3.50V, ensuring the microcontroller remains held in reset long enough for power rails to stabilize, clocks to lock, and internal registers to initialize. This timeout is temperature-stable (±5% variation over –40°C to +125°C) and independent of VCC slew rate - preventing premature release during slow-rising supplies. The MAX6385XS35D5-T's fixed delay eliminates software timing dependencies and simplifies qualification.