Analog Devices Inc./Maxim Integrated MAX6711REXS+T

Overview

MAX6711REXS+T from Maxim Integrated is a precision microprocessor supervisory circuit with push-pull active-low RESET output, designed for reliable power-on and brownout monitoring of +2.5V digital systems. It features a 2.63V reset threshold (±0.05V over -40°C to +125°C), 140ms minimum reset timeout, 12µA supply current at +2.5V, and guaranteed reset validity down to VCC = +1V. Used in portable battery-powered equipment and critical µP systems requiring stable low-voltage supervision.

For engineers reviewing the MAX6711REXS+T datasheet, MAX6711REXS+T pinout, MAX6711REXS+T application, or MAX6711REXS+T equivalent, key selection criteria include its SC70-4 package, active-low push-pull output, 2.63V threshold optimized for +2.5V rails, manual reset input with internal 20kΩ pull-up, and immunity to fast VCC transients up to 20µs at 100mV overdrive.

Technical Context

The MAX6711REXS+T integrates a precision voltage comparator with temperature-compensated reference (30ppm/°C) and a monostable timer to generate a minimum 140ms reset pulse after VCC rises above 2.63V or after MR deassertion. Its reset logic remains valid even as VCC decays to +1V, ensuring deterministic behavior during power-down sequences.

It uses an internal 20kΩ pull-up on the MR pin, accepts TTL/CMOS-compatible logic levels, and rejects VCC glitches ≤20µs when overdriven by 100mV-enabling robust operation in noisy or dynamically loaded power environments without external filtering.

Key Specifications

Pinout & Package

MAX6711REXS+T is housed in a 4-pin SC70 package (outline X4-1, land pattern 90-0187), measuring 1.25mm × 0.85mm × 0.55mm, suitable 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 MAX6711REXS+T, MAX6326XR29+T omits manual reset capability and targets higher-voltage rails, while TPS3123E18DBVR shifts to ultra-low-power +1.8V supervision with added watchdog functionality but demands layout changes and external biasing-making MAX6711REXS+T optimal for cost-sensitive, space-constrained +2.5V systems needing MR support.

Availability

MAX6711REXS+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, critical µP and µC power monitoring, intelligent instruments, and computers requiring stable component supply with lead-free compliance and extended temperature support.

Supply support for MAX6711REXS+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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, computing, and communications markets.

The MAX6711 series belongs to Maxim's microprocessor supervisory product line, engineered specifically for precision voltage monitoring and deterministic reset generation in low-voltage, battery-critical embedded systems.

FAQ

What is the exact reset threshold voltage of the MAX6711REXS+T and how does it vary with temperature?

The MAX6711REXS+T has a nominal reset threshold of 2.63V, with guaranteed limits of 2.59V (min) to 2.66V (max) at +25°C. Over the full operating range (-40°C to +125°C), the threshold stays within 2.50V to 2.76V, exhibiting a temperature coefficient of 30ppm/°C. This tight tolerance ensures consistent brownout detection for +2.5V systems across harsh thermal environments without recalibration.

Does the MAX6711REXS+T require external components to function in a typical application?

No, the MAX6711REXS+T operates autonomously with no external components required. Its internal 20kΩ MR pull-up resistor, precision voltage reference, and monostable timing circuit eliminate the need for external capacitors, resistors, or trimming elements-reducing BOM cost and PCB footprint while improving reliability in portable and space-constrained designs using the MAX6711REXS+T.

How does the MAX6711REXS+T handle VCC transients, and what is the maximum glitch duration it can reject?

The MAX6711REXS+T rejects negative-going VCC transients up to 20µs in duration when the overdrive (VTH – VCC) is 100mV, per its typical operating characteristics. This immunity is achieved through internal comparator hysteresis and filtering, enabling robust operation in systems powered by switching regulators or subject to load-switching noise-without requiring additional input capacitance or external protection for the MAX6711REXS+T.

What is the minimum VCC voltage at which the MAX6711REXS+T guarantees a valid RESET output state?

The MAX6711REXS+T guarantees correct RESET logic state (low during assertion) for VCC down to +1.0V. Below this level, the output becomes high-impedance. This feature ensures deterministic µP behavior during deep brownout events, preventing metastability or unintended execution-critical for fail-safe operation in safety-relevant applications using the MAX6711REXS+T.

Is the MAX6711REXS+T pin-compatible with other members of the MAX6711/MAX6712/MAX6713 family?

Yes, all MAX6711/MAX6712/MAX6713 variants-including MAX6711REXS+T-share identical 4-pin SC70 packaging and pinout (GND, RESET, MR, VCC). However, output type differs: MAX6711/MAX6712 use push-pull outputs, while MAX6713 uses open-drain. So while physical layout is interchangeable, electrical interface (e.g., pull-up requirement) must be verified when substituting MAX6711REXS+T for other family members.