Analog Devices Inc./Maxim Integrated MAX6711ZEXS+

Overview

MAX6711ZEXS+ from Maxim Integrated is a precision microprocessor supervisory circuit with push-pull active-low RESET output, designed for +2.5V supply monitoring in embedded systems. It asserts reset when VCC falls below 2.32V (typ), guarantees valid reset down to VCC = +1V, and delivers ≥140ms power-on reset timeout. Used in portable battery-powered equipment requiring low quiescent current (12µA typ) and high noise immunity.

For engineers reviewing the MAX6711ZEXS+ datasheet, MAX6711ZEXS+ pinout, MAX6711ZEXS+ application, or MAX6711ZEXS+ equivalent, key selection criteria include its 2.32V reset threshold, SC70-4 package, manual reset input with internal 20kΩ pull-up, transient-immune reset comparator, and guaranteed operation across –40°C to +125°C.

Technical Context

The MAX6711ZEXS+ integrates a precision voltage reference and comparator to monitor +2.5V supplies with ±1.5% threshold accuracy over temperature. Its reset logic includes built-in hysteresis and 140ms minimum timeout after VCC rise or MR deassertion.

It features a debounced manual reset input (MR) with 1µs minimum pulse width and 100ns glitch immunity, and its push-pull RESET output sinks 1.2mA at VCC ≥ VTH min while maintaining VOL ≤ 0.3V - enabling direct interface with CMOS/TTL µP reset inputs without external pull-ups.

Key Specifications

Pinout & Package

MAX6711ZEXS+ is housed in a 4-pin SC70 package (outline X4-1), measuring 1.3mm × 0.8mm × 0.6mm, with gull-wing leads and RoHS-compliant lead-free finish (+ suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6711ZEXS+, MAX6316LUT45+T omits manual reset and targets higher-voltage systems, while TPS3808G125DBVR trades push-pull simplicity for lower current and longer timeout - making MAX6711ZEXS+ optimal for space-constrained +2.5V designs needing MR and minimal external components.

Availability

MAX6711ZEXS+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, and handheld test instruments requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6711ZEXS+ 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 industrial, automotive, and computing applications, with emphasis on reliability, integration, and low-power operation.

The MAX6711 family delivers highly accurate, low-quiescent-current supervisory circuits for microprocessor-based systems - specifically engineered to replace discrete reset solutions in space- and power-sensitive embedded designs.

FAQ

What is the exact reset threshold voltage of MAX6711ZEXS+ and how does it vary with temperature?

The MAX6711ZEXS+ has a nominal reset threshold of 2.32V at +25°C, with guaranteed range of 2.25V to 2.38V over –40°C to +85°C and 2.21V to 2.45V over +85°C to +105°C. Its tempco is 30ppm/°C, resulting in <±1.5% total variation across –40°C to +125°C - ensuring consistent brownout detection for +2.5V rails in harsh environments. This specification is confirmed in the Electrical Characteristics table of the official MAX6711 datasheet.

Does MAX6711ZEXS+ require an external pull-up resistor on its RESET pin?

No, MAX6711ZEXS+ does not require an external pull-up resistor because it features a push-pull RESET output. The device actively drives the RESET pin low during reset assertion and high during deassertion, eliminating dependency on external components. This contrasts with the MAX6713 variant, which uses an open-drain output and mandates a pull-up. The push-pull architecture simplifies design and reduces BOM cost for the MAX6711ZEXS+.

What is the minimum pulse width required on the MR input to trigger a valid reset with MAX6711ZEXS+?

The MR input of MAX6711ZEXS+ requires a minimum pulse width of 1µs to reliably assert reset. This short requirement accommodates fast mechanical switches and digital logic edges without external debouncing. Additionally, the input provides 100ns glitch immunity, rejecting high-frequency noise that could otherwise cause unintended resets - a critical feature in electrically noisy industrial or automotive settings where MAX6711ZEXS+ is commonly deployed.

Can MAX6711ZEXS+ operate correctly when VCC drops below 1.0V?

MAX6711ZEXS+ guarantees valid RESET output behavior down to VCC = +1.0V, meaning it will correctly assert or maintain reset until VCC reaches this level. Below 1.0V, the internal output stage ceases sinking current and becomes high-impedance. While the device remains functional above 1.0V, system designers should ensure µP reset pins are biased (e.g., with a pull-down) if operation near 0V is required - a condition explicitly addressed in the MAX6711ZEXS+ datasheet's "Ensuring a Valid Reset Output Down to VCC = 0" section.

What package type and dimensions does MAX6711ZEXS+ use, and is it RoHS compliant?

MAX6711ZEXS+ uses a 4-pin SC70 package (outline X4-1), measuring 1.3mm × 0.8mm × 0.6mm with gull-wing leads. The "+" suffix in the part number explicitly denotes lead-free, RoHS-compliant construction per EU Directive 2011/65/EU. Land pattern requirements follow Maxim's documented footprint 90-0187, and thermal performance supports continuous operation at +125°C ambient when properly mounted on a 2-layer PCB with adequate copper pour.