Analog Devices Inc./Maxim Integrated MAX6712LEXS

Overview

MAX6712LEXS from Maxim Integrated is a precision microprocessor supervisory circuit with active-high push-pull RESET output, designed to monitor +5.0V power supplies in embedded systems. It asserts reset when VCC falls below 4.63V (±1.5% over temperature), guarantees reset validity down to VCC = +1V, and delivers a minimum 140ms power-on reset pulse width. Used in portable instrumentation and automotive control modules where supply stability and low quiescent current are critical.

For engineers reviewing the MAX6712LEXS datasheet, MAX6712LEXS pinout, MAX6712LEXS application, or MAX6712LEXS equivalent, key selection considerations include its active-high reset logic, 4.63V threshold accuracy across –40°C to +125°C, SC70-4 package footprint, and compatibility with manual reset input for field service and diagnostics.

Technical Context

The MAX6712LEXS implements a precision bandgap-based voltage comparator with hysteresis to detect VCC drops below its factory-trimmed 4.63V threshold. Its internal timing circuit ensures a guaranteed minimum 140ms reset assertion after VCC recovery or MR deassertion, independent of supply ramp rate.

It features an integrated 20kΩ pull-up on the MR input, accepts TTL/CMOS-compatible logic levels, and maintains correct RESET logic state (high) even as VCC decays to +1V-enabling reliable reset signaling during brownout conditions without external support circuitry.

Key Specifications

Pinout & Package

MAX6712LEXS is housed in a 4-pin SC70-4 (SOT-323) surface-mount package measuring 2.0mm × 2.1mm × 0.9mm, optimized for space-constrained PCB layouts in portable and automotive electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6712LEXS, MAX6711LEXS provides identical supervision accuracy and timing but requires redesign of reset signal routing due to inverted logic polarity; TLV803EB29DBZR reduces current draw by 7x but sacrifices manual reset capability and +5V compatibility, limiting use to lower-voltage subsystems.

Availability

MAX6712LEXS is available at Aetrix Electronics and suitable for automotive engine control units, portable medical monitors, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6712LEXS 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 demanding industrial, automotive, and communications applications, emphasizing reliability, integration, and thermal robustness.

The MAX671x family delivers highly accurate, low-power microprocessor supervisory functions specifically for mission-critical embedded systems where supply monitoring integrity directly impacts safety and data integrity.

FAQ

What is the reset threshold voltage of the MAX6712LEXS and how stable is it over temperature?

The MAX6712LEXS has a factory-trimmed reset threshold of 4.63V with ±1.5% tolerance over –40°C to +125°C. Its temperature coefficient is 20ppm/°C, meaning the threshold drifts less than 12mV across the full operating range - sufficient to guarantee reset assertion before µP operational failure at +5V nominal supply.

Does the MAX6712LEXS require an external pull-up resistor on its RESET pin?

No. The MAX6712LEXS features an active-high push-pull RESET output, so it actively drives high during reset assertion and low otherwise. Unlike open-drain variants (e.g., MAX6713), MAX6712LEXS does not require an external pull-up resistor, simplifying layout and reducing BOM count.

Can the MAX6712LEXS operate with supply voltages below +5.0V?

Yes. The MAX6712LEXS operates from VCC = +1.0V to +5.5V and maintains valid RESET output logic (high) down to +1.0V. However, its 4.63V reset threshold means it will only assert reset when monitoring +5.0V rails - it is not intended for 3.3V or lower supply supervision.

How does the manual reset (MR) input function on the MAX6712LEXS?

The MR input on MAX6712LEXS is active-low with an internal 20kΩ pull-up to VCC. Driving MR low asserts RESET immediately; RESET remains asserted for ≥140ms after MR returns high. The input rejects glitches <200ns and accepts TTL/CMOS logic levels, eliminating need for external debounce components.

Is the MAX6712LEXS pin-compatible with other devices in the MAX671x family?

Yes - all MAX671x variants (including MAX6711LEXS and MAX6713LEXS) share identical SC70-4 pinout and footprint. However, RESET logic polarity differs: MAX6712LEXS is active-high, MAX6711LEXS is active-low, and MAX6713LEXS uses open-drain. Board-level compatibility requires verification of reset signal polarity and external pull-up requirements.