Analog Devices Inc./Maxim Integrated MAX6712REXS-T

Overview

MAX6712REXS-T from Maxim Integrated is a precision microprocessor supervisory circuit with active-high push-pull RESET output, designed to monitor +2.5V supply rails in embedded digital systems. It provides 2.63V reset threshold (±1.5% over -40°C to +125°C), 140ms minimum power-on reset timeout, 12µA supply current at +25°C, and guaranteed reset validity down to VCC = +1V. It serves critical power-monitoring roles in portable battery-powered equipment and intelligent instrumentation.

For engineers reviewing the MAX6712REXS-T datasheet, MAX6712REXS-T pinout, MAX6712REXS-T application, or MAX6712REXS-T equivalent, key selection considerations include its active-high push-pull output configuration, SC70-4 package footprint, 2.63V threshold optimized for +2.5V systems, manual reset input with internal 20kΩ pull-up, and immunity to sub-20µs VCC transients exceeding 100mV below threshold.

Technical Context

The MAX6712REXS-T integrates a precision bandgap-based voltage reference and comparator to detect VCC drops below its factory-trimmed 2.63V threshold. Its reset logic asserts high for ≥140ms after VCC rises above threshold or MR deassertion, with glitch immunity on MR (100ns) and VCC (20µs delay for 100mV overdrive).

It features an active-high push-pull RESET output capable of sourcing 500µA at 0.8×VCC and sinking 1.2mA at 0.3V, with valid operation across full VCC range (1.0V–5.5V) and temperature (-40°C to +125°C). The MR input accepts TTL/CMOS levels and includes internal 20kΩ pull-up, eliminating external biasing.

Key Specifications

Pinout & Package

MAX6712REXS-T is housed in a 4-pin SC70 (SOT-323) package measuring 2.0mm × 2.1mm × 0.9mm, with gull-wing leads and RoHS-compliant lead-free finish (denoted by "+T" suffix variant).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6712REXS-T, the MAX6712REUS-T offers identical electrical behavior but incompatible packaging, while the TPS3123E12DBVR trades manual reset capability for lower quiescent current and longer reset timeout - making it suitable only where MR is unnecessary and extended battery life is paramount.

Availability

MAX6712REXS-T is available at Aetrix Electronics and suitable for portable medical monitors, industrial data loggers, smart sensor nodes, and test & measurement instruments requiring stable component supply across automotive-grade temperature ranges and long-lifecycle production programs.

Supply support for MAX6712REXS-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 demanding industrial, medical, and communications applications, with emphasis on reliability, low power, and integration.

The MAX6711/MAX6712/MAX6713 family delivers compact, low-power microprocessor supervisory functions for space-constrained and battery-sensitive systems - specifically engineered to replace discrete reset circuits in +2.5V, +3.0V, +3.3V, and +5.0V domains.

FAQ

What is the reset threshold voltage of the MAX6712REXS-T and how tightly is it specified?

The MAX6712REXS-T has a factory-trimmed reset threshold of 2.63V, specified with ±1.5% tolerance over the full operating temperature range of -40°C to +125°C. This tight accuracy ensures consistent brownout detection for +2.5V systems without requiring external calibration. The MAX6712REXS-T achieves this via laser-trimmed internal resistive divider and bandgap reference, validated per Maxim's production test flow.

Does the MAX6712REXS-T require external components to operate?

No, the MAX6712REXS-T operates autonomously with no external components required. It integrates the voltage reference, comparator, reset timer, and push-pull driver internally. The MR input includes a 20kΩ internal pull-up resistor, and the active-high RESET output drives directly into µP reset pins. This eliminates external capacitors, resistors, or diodes typically needed in discrete supervisory circuits - reducing BOM cost and PCB area for the MAX6712REXS-T.

How does the MAX6712REXS-T behave during rapid VCC transients?

The MAX6712REXS-T ignores fast negative-going VCC transients ≤20µs wide when the voltage dip exceeds 100mV below its 2.63V threshold - a feature confirmed in Figure 1 of the datasheet. This immunity prevents spurious resets caused by switching regulator noise or ESD coupling. The MAX6712REXS-T achieves this through internal comparator hysteresis and filtering, with no external capacitor needed on VCC beyond standard 0.1µF bypassing.

Can the MAX6712REXS-T be used with supply voltages below 2.5V?

Yes, the MAX6712REXS-T operates with VCC as low as 1.0V while maintaining valid RESET output logic states, and remains functional down to VCC = +1V with guaranteed reset assertion. Its internal circuitry continues to monitor the supply and assert RESET appropriately even during deep brownout conditions. This makes the MAX6712REXS-T suitable for applications with aging batteries or wide-input LDOs where VCC may sag below nominal 2.5V.

What is the function of the MR pin on the MAX6712REXS-T and how should it be interfaced?

The MR (Manual Reset) pin on the MAX6712REXS-T is an active-low input that forces RESET assertion when pulled low. It features an internal 20kΩ pull-up resistor, so it can be left unconnected if unused. For manual reset, connect a normally open momentary switch from MR to GND; no external debounce circuitry is required. The MAX6712REXS-T specifies 1µs minimum MR pulse width and 100ns glitch immunity, enabling robust interface with microcontroller GPIO or watchdog outputs.