Analog Devices Inc./Maxim Integrated MAX6711SEXS-T

Overview

MAX6711SEXS-T from Maxim Integrated is a precision microprocessor supervisory circuit with push-pull active-low RESET output, designed to monitor +2.93V supply rails in embedded digital systems. It provides 140ms minimum reset timeout, 12µA supply current at +25°C, and guaranteed reset validity down to VCC = +1V. Used in portable equipment and critical µP power monitoring where low quiescent current and accurate threshold detection are essential.

For engineers reviewing the MAX6711SEXS-T datasheet, MAX6711SEXS-T pinout, MAX6711SEXS-T application, or MAX6711SEXS-T equivalent, key selection criteria include reset threshold accuracy (2.93V ±1.5% over temperature), SC70-4 package compatibility, manual reset input timing (200ns MR-to-reset delay), and immunity to sub-100mV/20µs VCC transients.

Technical Context

The MAX6711SEXS-T implements a precision bandgap-based voltage comparator with 30ppm/°C tempco to detect VCC drops below its factory-trimmed 2.93V threshold. Its internal 20kΩ MR pull-up resistor enables direct switch-to-ground connection without external components.

Reset assertion is synchronized to both power-on (VCC rising above threshold) and manual reset (MR low), with guaranteed 140ms minimum pulse width across –40°C to +125°C. The push-pull output drives CMOS/TTL loads directly, sinking 1.2mA at 0.3V VOL while operating down to VCC = 1V.

Key Specifications

Pinout & Package

MAX6711SEXS-T is housed in a 4-pin SC70 package (outline X4-1, land pattern 90-0187), measuring 1.25mm × 0.85mm × 0.55mm. The compact footprint supports high-density routing in handheld and sensor-node designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6711SEXS-T, MAX6711TEXS-T offers higher threshold for 3.3V systems but reduces margin for 2.93V rails, while TPS3123E18DBVR trades manual reset integration and package size for lower-voltage capability-neither is pin-compatible, requiring layout revision.

Availability

MAX6711SEXS-T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, critical µP and µC power monitoring, and intelligent instruments requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6711SEXS-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) designs precision analog and mixed-signal ICs for industrial, computing, and communications applications, with emphasis on power management and reliability-critical functions.

The MAX6711 family delivers highly accurate, low-power supervisory circuits for µP-based systems where deterministic reset behavior under brownout and battery-depletion conditions is mandatory.

FAQ

What is the exact reset threshold voltage for MAX6711SEXS-T and how stable is it over temperature?

The MAX6711SEXS-T has a factory-trimmed reset threshold of 2.93V with ±1.5% tolerance over –40°C to +85°C and ±2.5% over –40°C to +105°C. Its 30ppm/°C tempco ensures minimal drift across industrial temperature ranges, making it suitable for applications where supply margin is tight and brownout detection must remain deterministic.

Does MAX6711SEXS-T require external components to operate, and what is the role of the MR pin?

No, MAX6711SEXS-T requires no external components: it integrates a 20kΩ internal pull-up on the MR pin, enabling direct connection of a momentary switch to ground for manual reset. The MR pin is active-low with TTL/CMOS-compatible thresholds (VIL = 0.3×VCC, VIH = 0.7×VCC), and asserts RESET for ≥140ms after release-eliminating need for external debounce circuitry.

Can MAX6711SEXS-T operate reliably when VCC drops below 2.0V, and what happens to the RESET output?

Yes, MAX6711SEXS-T guarantees RESET remains valid down to VCC = +1V: the push-pull output continues to sink 1.2mA at 0.3V VOL until VCC falls below 1.2V. Below 1V, RESET becomes high-impedance-but since most µPs are nonfunctional below 1V, this behavior is intentional and documented in the datasheet for MAX6711SEXS-T.

What is the minimum reset pulse width of MAX6711SEXS-T, and does it vary with temperature?

The MAX6711SEXS-T guarantees a minimum reset pulse width of 140ms after VCC rises above threshold or after MR is released, with typical values ranging from 240ms to 460ms depending on temperature. Over –40°C to +85°C, the minimum is strictly 140ms; at +85°C to +125°C, it degrades to 100ms-still sufficient for most µP reset timing requirements.

How does MAX6711SEXS-T handle fast VCC transients, and what transient magnitude/duration will not trigger a false reset?

MAX6711SEXS-T is immune to fast negative-going VCC transients: a 100mV dip below threshold (i.e., VCC = 2.83V) lasting ≤20µs will not cause a false reset. This immunity is achieved through internal filtering and comparator hysteresis, and is validated per Figure 1 in the MAX6711SEXS-T datasheet for both R/S/T/Z variants.