Analog Devices Inc./Maxim Integrated MAX6711SEXS

Overview

The MAX6711SEXS from Maxim Integrated is a precision microprocessor supervisory circuit in SC70-4 package, designed to monitor +3.3V power supplies and assert an active-low push-pull reset signal when VCC drops below 2.93V. It provides 140ms minimum reset pulse width, 12µA supply current, and guaranteed reset validity down to VCC = +1V. It is used in portable battery-powered systems requiring reliable power-on and brownout reset.

For engineers reviewing the MAX6711SEXS datasheet, MAX6711SEXS pinout, MAX6711SEXS application, or MAX6711SEXS equivalent, key selection criteria include its 2.93V reset threshold for +3.3V rails, manual reset input with internal 20kΩ pull-up, SC70-4 footprint compatibility, and immunity to fast VCC transients up to 20µs at 100mV overdrive.

Technical Context

The MAX6711SEXS implements a precision voltage comparator with ±1.5% threshold accuracy over -40°C to +125°C, directly monitoring VCC against a trimmed internal reference. Its reset logic includes built-in hysteresis and a 140ms timeout counter that holds RESET asserted after VCC recovery or MR deassertion.

It features a debounced manual reset input (MR) with 100ns glitch immunity and 200ns MR-to-reset delay, and its push-pull output drives CMOS loads without external components. The device remains functional with VCC as low as +1V, ensuring deterministic reset state during deep brownout.

Key Specifications

Pinout & Package

MAX6711SEXS is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm, 0.65mm pitch), optimized for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6711SEXS, MAX6326UR29 saves one pin and footprint but removes field-serviceability; TPS3808G33DBVR offers superior current efficiency and longer timeout but requires layout change and may over-delay boot sequences in real-time control loops.

Availability

MAX6711SEXS is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, industrial PLC I/O submodules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6711SEXS 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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and computing applications.

The MAX6711 family delivers precision, low-power microprocessor supervision for space- and power-constrained systems, targeting applications where reliable power-on, brownout, and manual reset functionality is essential without external components.

FAQ

What is the exact reset threshold voltage of the MAX6711SEXS and how tightly is it specified?

The MAX6711SEXS has a nominal reset threshold of 2.93V, with a total accuracy of ±1.5% over the full operating temperature range (-40°C to +125°C). This specification is guaranteed by design and production-tested at +25°C, ensuring consistent behavior across automotive and industrial environments without calibration. The 2.93V value is specifically selected to monitor +3.3V rails while providing adequate margin above typical LDO dropout voltages.

Does the MAX6711SEXS require any external components to operate correctly?

No, the MAX6711SEXS operates fully autonomously with no external components required. Its push-pull RESET output eliminates the need for a pull-up resistor, the internal 20kΩ pull-up on the MR pin allows direct switch-to-ground connection without added resistors, and the precision voltage reference is fully integrated. This reduces BOM count, PCB area, and design validation effort compared to discrete reset solutions.

How does the MAX6711SEXS behave when VCC drops below 1V, and why is this important?

When VCC falls below +1V, the MAX6711SEXS guarantees that its RESET output remains asserted (low) and stops sinking current - effectively becoming an open circuit. This prevents floating reset lines in deeply browned-out systems. It is critical for safety-critical applications like smart meters or medical devices, where incomplete firmware execution during power collapse could lead to data corruption or unsafe states. The MAX6711SEXS ensures deterministic behavior down to 1V, unlike many supervisors that lose control below 1.2V.

Can the MAX6711SEXS be used with a 2.5V supply, and what is its minimum operating voltage?

The MAX6711SEXS is rated for VCC from +1.0V to +5.5V, so it functions with 2.5V supplies, but its reset threshold remains fixed at 2.93V. Therefore, when powered from 2.5V, the device will assert RESET continuously because VCC never reaches the 2.93V threshold. It is intended only for monitoring +3.3V rails. For 2.5V systems, use MAX6711ZEUS (2.32V threshold) or MAX6711REUS (2.63V threshold), both in the same SC70-4 package.

What is the purpose of the manual reset (MR) input on the MAX6711SEXS, and how should it be implemented?

The MR input on the MAX6711SEXS provides a user- or system-initiated reset path independent of VCC monitoring. It is active-low, internally pulled up to VCC via 20kΩ, and debounced with 100ns glitch immunity. To implement, connect a normally open momentary switch between MR and GND; no external R/C network is needed. In noisy environments, add a 0.1µF capacitor from MR to GND. Leaving MR unconnected defaults to inactive (high), making the MAX6711SEXS fully functional without manual reset wiring.