Analog Devices Inc./Maxim Integrated MAX6386LT26D3+

Overview

MAX6386LT26D3+ from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 2.63V reset threshold (±2.5% over –40°C to +125°C), 140ms minimum VCC reset timeout, and debounced manual reset input (MR) with internal 63kΩ pullup. It operates from 1.0V to 5.5V supply and consumes only 3μA at 1.8V, enabling reliable power monitoring in battery-powered embedded systems.

For engineers reviewing the MAX6386LT26D3+ datasheet, MAX6386LT26D3+ pinout, MAX6386LT26D3+ application, or MAX6386LT26D3+ equivalent, key selection criteria include its 2.63V reset threshold accuracy, 140ms reset timeout, MR input compatibility with TTL/CMOS logic, guaranteed reset validity down to VCC = 1V, and SC70-4 package footprint for space-constrained designs.

Technical Context

The MAX6386LT26D3+ implements a precision bandgap-based voltage comparator monitoring VCC against a fixed 2.63V threshold, with ±2.5% tolerance over full industrial temperature range. Its internal timer enforces a minimum 140ms reset assertion after VCC recovery, independent of supply ramp rate.

It features a dedicated active-low manual reset input (MR) with built-in 63kΩ internal pullup resistor, supporting direct connection to momentary switches or logic signals without external components. The open-drain RESET output requires an external pullup and remains valid down to VCC = 1V, ensuring deterministic behavior during brownout conditions.

Key Specifications

Pinout & Package

MAX6386LT26D3+ 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 MAX6386LT26D3+, MAX6326XR26D3+T offers identical supervision parameters but lacks MR support and uses push-pull output, while TPS3808G33DBVR shifts threshold upward and removes manual reset-making MAX6386LT26D3+ the sole option meeting 2.63V, 140ms, and MR requirements simultaneously.

Availability

MAX6386LT26D3+ is available at Aetrix Electronics and suitable for battery-powered IoT sensors, industrial PLC I/O modules, automotive body control units, and medical wearable diagnostics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6386LT26D3+ 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, emphasizing low power, high reliability, and small form factor.

The MAX6381–MAX6390 family delivers single/dual low-voltage μP reset circuits targeting space- and power-constrained embedded systems where guaranteed reset behavior under brownout, transient, and manual conditions is critical.

FAQ

What is the exact reset threshold voltage of the MAX6386LT26D3+ and how stable is it over temperature?

The MAX6386LT26D3+ has a factory-set nominal reset threshold of 2.63V, 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 on-chip temperature compensation, ensuring consistent brownout detection without external calibration.

Does the MAX6386LT26D3+ require an external pullup resistor on the RESET pin?

Yes, the MAX6386LT26D3+ features an open-drain active-low RESET output, which requires an external pullup resistor to establish a defined logic-high state when deasserted. Typical values range from 10kΩ to 100kΩ, selected based on bus capacitance and rise-time requirements. No pullup is needed for the MR input, as it includes a 63kΩ internal pullup to VCC.

Can the MAX6386LT26D3+ operate reliably during severe supply voltage droops?

Yes, the MAX6386LT26D3+ guarantees valid RESET output behavior down to VCC = 1V, ensuring deterministic reset assertion and hold time even during deep brownout events. Its internal circuitry remains functional and the reset timeout timer continues counting accurately, unlike many competitors that lose timing integrity below 1.5V.

What is the minimum pulse width required on the MR pin to trigger a reset with the MAX6386LT26D3+?

The MAX6386LT26D3+ requires a minimum MR input pulse width of 1µs to reliably initiate a reset. This short requirement, combined with built-in 100ns glitch rejection, allows robust manual reset triggering using standard tactile switches or digital logic without additional debouncing circuitry.

Is the MAX6386LT26D3+ qualified for automotive applications?

No, the MAX6386LT26D3+ is not AEC-Q100 qualified. While it operates across –40°C to +125°C and carries the "+" RoHS-compliant marking, automotive qualification requires specific /V suffix variants (e.g., MAX6386LT26D3/V+T). The MAX6386LT26D3+ is intended for industrial, medical, and consumer applications meeting those temperature and reliability requirements.