Analog Devices Inc./Maxim Integrated MAX6711REXS

Overview

MAX6711REXS from Maxim Integrated is a precision microprocessor supervisory circuit in SC70-4 package, designed to monitor +2.5V power supplies and assert an active-low push-pull reset signal when VCC drops below 2.63V. It guarantees reset validity down to VCC = +1V, delivers 140ms minimum reset pulse width, and draws only 12µA supply current-ideal for battery-powered systems requiring reliable brownout detection and manual reset capability.

For engineers reviewing the MAX6711REXS datasheet, MAX6711REXS pinout, MAX6711REXS application, or MAX6711REXS equivalent, this device serves as a low-power, temperature-stable reset supervisor for portable instrumentation, automotive control modules, and embedded µC systems where supply voltage accuracy, transient immunity, and guaranteed reset timing are critical selection criteria.

Technical Context

The MAX6711REXS implements a precision bandgap-based reset comparator with ±0.5% threshold accuracy over -40°C to +125°C, ensuring deterministic reset assertion at 2.63V ±13mV. Its internal 20kΩ pull-up on MR enables direct switch-to-ground manual reset without external components.

It features push-pull RESET output capable of sourcing 500µA (VCC > VTH) and sinking 3.2mA (VCC = VTH min), with guaranteed logic-state integrity down to VCC = 1.0V. The reset timeout is fixed at ≥140ms after VCC recovery or MR deassertion, independent of supply ramp rate.

Key Specifications

Pinout & Package

MAX6711REXS is housed in a 4-pin SC70-4 package with exposed pad (not electrically connected). Pin 1 is RESET (active-low push-pull output), Pin 2 is GND, Pin 3 is MR (active-low manual reset input), and Pin 4 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6711REXS, both alternatives offer lower quiescent current but lack its precise 2.63V threshold, integrated manual reset, and validated operation across -40°C to +125°C-making MAX6711REXS uniquely suited for robust 2.5V-system supervision in demanding environments.

Availability

MAX6711REXS is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, industrial handheld testers, smart energy meters, and battery-powered instrumentation requiring stable component supply and long-lifecycle support.

Supply support for MAX6711REXS 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 high-performance analog and mixed-signal ICs for industrial, automotive, communications, and computing markets.

The MAX6711REXS belongs to the MAX671x family of microprocessor supervisory circuits, engineered specifically for accurate, low-power, and temperature-stable reset generation in battery-operated and harsh-environment systems.

FAQ

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

The MAX6711REXS has a nominal reset threshold of 2.63V at +25°C, with ±13mV (±0.5%) tolerance over the full -40°C to +125°C operating range. Its tempco is specified at <50ppm/°C, meaning threshold drift remains under ±10mV across the entire temperature span-ensuring consistent brownout detection in automotive and industrial applications where thermal stability is critical. This value is confirmed in the Electrical Characteristics table for the "R" suffix variant.

Does the MAX6711REXS require external components to function as a complete reset supervisor?

No, the MAX6711REXS requires zero external components for basic operation. It integrates a 20kΩ internal pull-up on the MR pin, eliminating the need for an external resistor when using a momentary switch. Its push-pull RESET output drives directly into µP reset inputs without a pull-up. No capacitors, resistors, or trimming elements are needed-reducing BOM cost, board area, and potential field failure points compared to discrete reset solutions.

Can the MAX6711REXS operate reliably when the VCC supply drops below 2.0V?

Yes, the MAX6711REXS guarantees correct RESET output logic state down to VCC = +1.0V. Below this voltage, the RESET output becomes high-impedance, but within the 1.0V–2.5V range, it maintains active-low assertion with defined VOL and VOH specifications. This behavior is explicitly verified in the Electrical Characteristics table and enables safe, predictable shutdown sequencing in systems experiencing deep brownouts or partial power loss.

How does the manual reset (MR) input behave during power-up and what is its minimum pulse width requirement?

The MR input is active-low with an internal 20kΩ pull-up, so it defaults high when unconnected. When pulled low (e.g., via switch to GND), RESET asserts immediately and remains asserted for ≥140ms after MR returns high-regardless of VCC level. The minimum MR pulse width is 100ns, and it rejects glitches shorter than 200ns. This ensures robust operation in noisy environments and eliminates need for external debounce circuitry, simplifying design for handheld and automotive interfaces.

What package type and dimensions does the MAX6711REXS use, and is it RoHS-compliant?

The MAX6711REXS uses the SC70-4 package (1.25mm × 0.8mm × 0.5mm body height), with pin pitch of 0.65mm. It is available in both leaded and lead-free versions; the "+T" suffix denotes RoHS-compliant packaging. The device meets JEDEC standards for moisture sensitivity level (MSL) 1 and is qualified for reflow soldering per J-STD-020. Full package drawings are documented in Maxim's SC70-4 outline 21-0098.