Analog Devices Inc./Maxim Integrated MAX6383LT31D2+T

Overview

MAX6383LT31D2+T from Maxim Integrated is an open-drain active-low microprocessor supervisory circuit designed for reliable power-on reset and brownout detection in low-voltage systems. It features a factory-set 3.08V reset threshold (±2.5% over -40°C to +125°C), 20ms minimum 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 ultra-low-power voltage monitoring.

For engineers reviewing the MAX6383LT31D2+T datasheet, MAX6383LT31D2+T pinout, MAX6383LT31D2+T application, or MAX6383LT31D2+T equivalent, key selection criteria include open-drain reset output compatibility with shared bus lines, precise 3.08V threshold for 3.3V rail supervision, 20ms timeout for fast-boot microcontrollers, and SC70-3 package suitability for space-constrained PCB layouts.

Technical Context

This device implements a precision bandgap-based voltage comparator with hysteresis to monitor VCC against a fixed internal reference. The reset assertion is latched by an internal timer that enforces a minimum 20ms timeout after VCC rises above the 3.08V threshold, preventing premature processor release during marginal supply recovery.

The open-drain RESET output requires an external pullup resistor and supports wired-OR configurations across multiple supervisors. Its logic state remains valid down to VCC = 1V, enabling robust reset signaling even during deep brownout conditions before full power collapse.

Key Specifications

Pinout & Package

MAX6383LT31D2+T is housed in a RoHS-compliant 3-pin SC70 package (outline 21-0075, land pattern 90-0208) with 0.65mm pitch and thermal resistance θJA = 340.4°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 MAX809TRD2+T and TPS3808G30DBVR, MAX6383LT31D2+T uniquely balances ultra-low 3μA supply current, open-drain bus-sharing capability, and guaranteed reset validity down to 1V-making it optimal for battery-critical and multi-IC reset-bus architectures.

Availability

MAX6383LT31D2+T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered IoT nodes, industrial PLC I/O modules, and automotive body control units requiring stable component supply and long-term production continuity.

Supply support for MAX6383LT31D2+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 demanding industrial, automotive, and computing applications, with emphasis on power efficiency and reliability.

The MAX6381–MAX6390 family delivers low-power, factory-trimmed μP reset supervisors optimized for space-constrained, battery-sensitive systems requiring accurate voltage monitoring and deterministic reset timing.

FAQ

What is the exact reset threshold voltage of MAX6383LT31D2+T and how stable is it over temperature?

The MAX6383LT31D2+T has a nominal reset threshold of 3.08V, with guaranteed accuracy of ±2.5% over the full -40°C to +125°C operating range. This stability is achieved through laser-trimmed bandgap references and low-tempco design, ensuring reliable 3.3V rail supervision without external calibration components in MAX6383LT31D2+T applications.

Does MAX6383LT31D2+T require an external pullup resistor on its RESET pin?

Yes, MAX6383LT31D2+T features an open-drain active-low RESET output and requires an external pullup resistor to the target logic voltage (e.g., 3.3V or 5V). Typical values range from 10kΩ to 100kΩ depending on bus capacitance and rise-time requirements. Without this resistor, the MAX6383LT31D2+T reset signal cannot drive high and will remain indeterminate.

Can MAX6383LT31D2+T operate reliably when VCC drops below 1.8V?

Yes, MAX6383LT31D2+T is guaranteed to maintain valid reset output logic states down to VCC = 1.0V, including proper assertion and deassertion timing. At VCC = 1.0V, it still sinks 80µA with VOL ≤ 0.3V, enabling robust brownout detection in MAX6383LT31D2+T deployments where supply collapse must be caught early.

What is the minimum reset timeout period for MAX6383LT31D2+T and how is it implemented?

The MAX6383LT31D2+T provides a fixed 20ms minimum reset timeout period (suffix D2), enforced by an internal RC-based timer that begins counting when VCC rises above the 3.08V threshold. This timeout ensures the reset signal remains asserted long enough for microcontroller internal clocks and PLLs to stabilize before firmware execution resumes in MAX6383LT31D2+T systems.

Is MAX6383LT31D2+T compatible with standard SC70-3 footprints and what are its thermal characteristics?

Yes, MAX6383LT31D2+T uses the industry-standard 3-pin SC70 package (outline 21-0075) with 0.65mm pitch and matches common land pattern 90-0208. Its thermal resistance is θJA = 340.4°C/W on a multilayer board, supporting continuous operation at +125°C ambient when properly routed, making it suitable for high-reliability MAX6383LT31D2+T implementations in harsh environments.