Analog Devices Inc./Maxim Integrated MAX6711LEXS

Overview

The MAX6711LEXS from Maxim Integrated is a precision microprocessor supervisory circuit in SC70-4 package, designed to monitor +5.0V supply voltage with 4.63V reset threshold, provide push-pull active-low RESET output, and support manual reset assertion with ≥140ms timeout. It guarantees valid reset operation down to VCC = +1V and draws only 12µA supply current, making it suitable for critical power-up sequencing in portable embedded controllers.

For engineers reviewing the MAX6711LEXS datasheet, MAX6711LEXS pinout, MAX6711LEXS application, or MAX6711LEXS equivalent, key selection criteria include its fixed 4.63V reset threshold, push-pull active-low output architecture, guaranteed 140ms minimum reset pulse width, and SC70-4 footprint compatibility with space-constrained µP systems requiring reliable brownout detection.

Technical Context

The MAX6711LEXS implements a precision bandgap-based voltage comparator with ±1.5% threshold accuracy over -40°C to +125°C, ensuring deterministic reset assertion when VCC falls below 4.63V. Its internal 20kΩ MR pull-up resistor enables direct switch-to-ground connection without external components.

Reset remains asserted for ≥140ms after VCC rises above 4.63V or after MR deassertion, and the push-pull output drives low to ≤0.3V at 800µA sink, eliminating need for external pull-downs. The device maintains correct logic state for VCC ≥1V and rejects transients ≤20µs at 100mV overdrive.

Key Specifications

Pinout & Package

MAX6711LEXS is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm × 0.9mm), optimized for high-density PCB layouts in portable and automotive applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6711LEXS, MAX6326LUR29 offers lower quiescent current but cannot supervise +5.0V rails or accept manual reset, while TPS3808G125DBVR supports adjustable timing but requires layout changes and lacks the precise 4.63V threshold needed for robust +5V system supervision.

Availability

MAX6711LEXS is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, and portable medical monitors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6711LEXS 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 communications applications, emphasizing high reliability and low power.

The MAX6711 family delivers highly accurate, low-quiescent-current supervisory circuits for microprocessor power monitoring, targeting applications where deterministic reset behavior and minimal external components are essential.

FAQ

What is the exact reset threshold voltage for MAX6711LEXS?

The MAX6711LEXS has a factory-trimmed reset threshold of 4.63V with ±1.5% accuracy over -40°C to +125°C. This value is confirmed in the Selector Guide and Electrical Characteristics table of the datasheet, specifically matching the 'L' suffix variant for +5.0V systems. The MAX6711LEXS uses this precise threshold to assert reset when VCC drops below 4.63V, ensuring reliable operation before supply degradation affects µP stability.

Does MAX6711LEXS require external components for basic operation?

No, MAX6711LEXS operates without external components: it integrates a 20kΩ pull-up resistor on the MR pin and requires no external capacitors or resistors for reset timing or threshold setting. The push-pull RESET output eliminates need for pull-up/pull-down networks. Only a 0.1µF VCC bypass capacitor is recommended for transient immunity - not required for core functionality but strongly advised per datasheet guidelines for MAX6711LEXS.

What is the minimum VCC voltage at which MAX6711LEXS guarantees valid RESET output?

MAX6711LEXS guarantees correct RESET logic state for VCC ≥ +1.0V. Below 1V, the output becomes high-impedance; however, the datasheet confirms that RESET remains valid (low for MAX6711LEXS) throughout the entire operational range down to 1V. This ensures deterministic behavior during brownout conditions where other supervisors may fail, making MAX6711LEXS suitable for safety-critical applications requiring supervision to the last volt.

How does the manual reset function work on MAX6711LEXS?

The MR pin on MAX6711LEXS is an active-low input with internal 20kΩ pull-up to VCC. Driving MR low (e.g., via momentary switch to GND) asserts RESET immediately and holds it active for ≥140ms after MR returns high. No external debounce is needed due to built-in filtering. This allows field service personnel or test equipment to initiate controlled system resets without modifying firmware or hardware - a verified feature documented in the "Manual Reset Input" section of the MAX6711LEXS datasheet.

Is MAX6711LEXS compatible with lead-free soldering processes?

Yes, MAX6711LEXS is available in lead-free packaging. Per the Ordering Information section, lead-free variants are ordered by replacing the "-T" suffix with "+T", e.g., MAX6711LEXS+T. The device supports standard reflow profiles including JEDEC J-STD-020 moisture sensitivity level 1, and its SC70-4 package is qualified for lead-free assembly. This makes MAX6711LEXS compliant with RoHS and suitable for modern high-reliability manufacturing lines.