Analog Devices Inc./Maxim Integrated MAX6711REXS+

Overview

The 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 2.32V. It guarantees reset validity down to VCC = +1V, delivers 140ms minimum reset pulse width, and draws only 12µA supply current-ideal for battery-powered instrumentation and embedded controllers requiring reliable brownout protection.

For engineers reviewing the MAX6711REXS+ datasheet, MAX6711REXS+ pinout, MAX6711REXS+ application, or MAX6711REXS+ equivalent, this device offers verified reset threshold accuracy (±1.5% over -40°C to +125°C), manual reset input with internal 20kΩ pull-up, immunity to fast VCC transients (<20µs at 100mV overdrive), and guaranteed logic-state integrity across full industrial temperature range.

Technical Context

The MAX6711REXS+ implements a precision bandgap-based voltage comparator with hysteresis to detect VCC decline below its factory-trimmed 2.32V threshold. Its reset timing circuitry ensures ≥140ms assertion after VCC recovery or MR deassertion, independent of supply ramp rate.

It features a dedicated manual reset (MR) input with glitch immunity (≥100ns), internal 20kΩ pull-up, and TTL/CMOS-compatible logic thresholds (VIL ≤ 0.3·VCC, VIH ≥ 0.7·VCC). The push-pull RESET output drives low to ≤0.3V at 500µA sink and high to ≥0.8·VCC at 150µA source, ensuring robust interfacing with µP reset inputs.

Key Specifications

Pinout & Package

MAX6711REXS+ is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm, 0.5mm pitch), optimized for space-constrained PCB layouts in portable and automotive modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6711REXS+, MAX6316MUT46D3+ saves 10.4µA supply current but cannot support manual reset or +2.5V monitoring, while TPS3808G125DBVR offers tighter threshold accuracy but demands external biasing and lacks push-pull drive-making MAX6711REXS+ optimal for cost-sensitive, MR-enabled +2.5V embedded designs.

Availability

MAX6711REXS+ is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, industrial PLC I/O submodules, and handheld test & measurement devices requiring stable component supply across extended temperature ranges and long production lifecycles.

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

The MAX6711REXS+ belongs to Maxim's microprocessor supervisory product line, engineered specifically for precision voltage monitoring and deterministic reset generation in space- and power-constrained embedded systems operating at +2.5V, +3.0V, +3.3V, or +5.0V rails.

FAQ

What is the exact reset threshold voltage of the MAX6711REXS+ and how tightly is it specified?

The MAX6711REXS+ has a factory-trimmed reset threshold of 2.32V, specified with ±1.5% tolerance over the full -40°C to +125°C temperature range. This value is confirmed in the Electrical Characteristics table of the official Maxim datasheet (19-1623 Rev 1), and applies specifically to the "Z" variant denoted by the "R" in the suffix-ensuring reliable detection of brownout conditions in +2.5V systems without external calibration or margining overhead.

Does the MAX6711REXS+ require an external pull-up resistor on its RESET pin?

No, the MAX6711REXS+ does not require an external pull-up resistor because it features a push-pull RESET output. Its active-low RESET pin drives high to ≥0.8·VCC and low to ≤0.3V at rated load, enabling direct connection to standard µP reset inputs without additional components-unlike open-drain alternatives such as the MAX6713 series which mandate external pull-up resistors.

Can the MAX6711REXS+ operate and assert reset when VCC falls below 2.0V?

Yes, the MAX6711REXS+ guarantees valid reset assertion and correct logic state down to VCC = +1.0V, as explicitly stated in the datasheet's Electrical Characteristics and Detailed Description sections. This ensures deterministic behavior during deep brownout events, allowing systems to safely halt operation before logic corruption occurs-even when the monitored +2.5V rail collapses toward 1V.

What is the function and electrical behavior of the MR pin on the MAX6711REXS+?

The MR (Manual Reset) pin on the MAX6711REXS+ is an active-low input with an internal 20kΩ pull-up resistor to VCC. When pulled low (≤0.3·VCC), it forces RESET assertion; release triggers a ≥140ms reset pulse. It accepts TTL/CMOS logic levels, rejects glitches ≥100ns, and requires no external debounce-enabling simple momentary switch-to-ground implementation for field service or test-mode reset functionality in the MAX6711REXS+.

Is the MAX6711REXS+ compatible with lead-free PCB assembly processes?

Yes, the MAX6711REXS+ is supplied in lead-free packaging, as indicated by the "+" suffix per Maxim's ordering convention (replacing "-T" with "+T"). It complies with RoHS directives and supports standard reflow profiles including JEDEC J-STD-020 moisture sensitivity level 1, making it suitable for modern lead-free SMT assembly lines without special handling or baking requirements.