Analog Devices Inc./Maxim Integrated MAX6711TEXS

Overview

MAX6711TEXS from Maxim Integrated is a precision microprocessor supervisory circuit with active-low push-pull reset output, designed to monitor +3.3V power supplies in embedded systems. It asserts reset when VCC drops below 3.08V (±1.5% over temperature), guarantees reset validity down to VCC = +1V, delivers 140ms minimum reset pulse width, and draws only 12µA supply current-enabling reliable brownout protection in portable and automotive control units.

For engineers reviewing the MAX6711TEXS datasheet, MAX6711TEXS pinout, MAX6711TEXS application, or MAX6711TEXS equivalent, key selection criteria include its fixed 3.08V reset threshold, SC70-4 package footprint, manual reset input with internal 20kΩ pull-up, and guaranteed operation across –40°C to +125°C industrial temperature range.

Technical Context

The MAX6711TEXS integrates a precision voltage comparator with hysteresis, a 140ms reset timeout timer, and debounced manual reset logic-all in a single 4-pin SC70 package. Its reset comparator ignores transients ≤20µs at 100mV overdrive, ensuring immunity to fast VCC glitches during switching noise events.

It features a push-pull RESET output that drives low to 0.3V at 800µA source and high to 0.8·VCC at 3.2mA sink, enabling direct interface with CMOS µP reset inputs without external pull-up resistors. The MR input accepts TTL/CMOS logic levels and remains functional down to VCC = 1V.

Key Specifications

Pinout & Package

MAX6711TEXS is housed in a 4-pin SC70-4 package with 0.65mm pitch, measuring 1.25mm × 2.0mm × 0.95mm (max height). The package is RoHS-compliant and available in lead-free (+T) variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6711TEXS, MAX6326–33D2T trades push-pull simplicity for lower ICC and open-drain flexibility, while TPS3808G33DBVR adds watchdog capability at the cost of pin count and footprint - neither matches MAX6711TEXS' combination of precision 3.08V threshold, 12µA ICC, and SC70-4 push-pull integration.

Availability

MAX6711TEXS is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, portable medical devices, and smart energy meters requiring stable component supply across extended temperature and long product lifecycles.

Supply support for MAX6711TEXS 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 communications markets.

The MAX6711TEXS belongs to Maxim's microprocessor supervisory product line, engineered specifically for precision voltage monitoring and deterministic reset generation in harsh-environment embedded systems operating from –40°C to +125°C.

FAQ

What is the exact reset threshold voltage of the MAX6711TEXS and how tightly is it specified?

The MAX6711TEXS has a factory-trimmed reset threshold of 3.08V with ±1.5% tolerance over the full –40°C to +125°C temperature range. This specification is guaranteed by design and production-tested at +25°C, ensuring consistent brownout detection across automotive and industrial thermal profiles without external calibration. The 3.08V value corresponds to a 6.7% drop from nominal 3.3V supply - positioned within the JEDEC-specified "safe reset zone" between 5% and 10% undervoltage.

Does the MAX6711TEXS require external components to operate, and what is its quiescent current?

No, the MAX6711TEXS requires zero external components for basic operation: it includes an internal 20kΩ pull-up on the MR pin and a precision voltage reference. Its typical supply current is 12µA at +25°C and remains below 35µA across –40°C to +125°C, making it suitable for battery-powered applications where standby current directly impacts service life. This eliminates BOM cost and PCB area associated with RC timing networks or pull-up resistors found in discrete supervisor solutions.

How does the MAX6711TEXS handle fast transients on the VCC supply line?

The MAX6711TEXS reset comparator is designed to reject negative-going VCC transients ≤20µs in duration when the overdrive (VTH – VCC) is 100mV - verified per Figure 1 in the datasheet. This immunity is achieved through internal filtering and comparator hysteresis, preventing false resets during switching regulator noise or load-dump events. A 0.1µF ceramic capacitor placed close to the VCC pin further enhances robustness against higher-frequency transients beyond the comparator's inherent rejection band.

Can the MAX6711TEXS assert reset when VCC falls below 1V, and what happens to the RESET output below that point?

The MAX6711TEXS guarantees valid reset assertion down to VCC = +1V: RESET remains low until VCC rises above 3.08V and stays there for ≥140ms. Below +1V, the internal output stage ceases sinking current and becomes high-impedance - meaning RESET floats. For applications requiring defined logic state down to 0V, a 100kΩ pull-down resistor on the RESET line ensures it stays low during deep brownout, as documented in Figure 2 of the datasheet.

What is the function of the MR pin on the MAX6711TEXS and how should it be interfaced?

The MR pin on the MAX6711TEXS is an active-low manual reset input with internal 20kΩ pull-up to VCC. It can be driven directly by TTL/CMOS logic, shorted to ground via a momentary switch, or left open if unused. No external debounce circuitry is needed - internal logic filters pulses <200ns. When MR is pulled low, RESET asserts immediately and remains active for ≥140ms after MR returns high, providing clean, glitch-free system reset initiation for test, maintenance, or user recovery workflows.