Analog Devices Inc./Maxim Integrated MAX6712SEXS+T

Overview

MAX6712SEXS+T from Maxim Integrated is a precision microprocessor supervisory circuit with active-high push-pull RESET output, designed for reliable power-on and brownout reset generation in +3.3V digital systems. It features a 2.93V ±1.5% reset threshold, 140ms minimum reset timeout, 12µA supply current at +25°C, and guaranteed reset validity down to VCC = +1V. It is used in portable battery-powered equipment requiring low-power, high-accuracy voltage monitoring.

For engineers reviewing the MAX6712SEXS+T datasheet, MAX6712SEXS+T pinout, MAX6712SEXS+T application, or MAX6712SEXS+T equivalent, this page delivers verified electrical parameters, SC70-4 package details, manual reset timing behavior, and real-world substitution guidance - all specific to the MAX6712SEXS+T variant with S-suffix (2.93V threshold) and +T lead-free marking.

Technical Context

The MAX6712SEXS+T implements a precision bandgap-based voltage comparator with 30ppm/°C tempco to monitor VCC against a factory-trimmed 2.93V threshold. Its internal 20kΩ MR pull-up resistor enables direct switch-to-ground connection without external components.

It asserts an active-high RESET signal when VCC drops below 2.93V or when MR is pulled low, holding RESET asserted for ≥140ms after VCC recovers or MR releases. The push-pull output drives CMOS/TTL loads directly, eliminating need for external pull-up resistors unlike open-drain variants.

Key Specifications

Pinout & Package

MAX6712SEXS+T is housed in a 4-pin SC70 package (outline X4-1, land pattern 90-0187), measuring 1.25mm × 0.85mm × 0.55mm, suitable for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6712SEXS+T, the µDFN-packaged MAX6712SEUS+T saves 22% board area but needs re-layout, while TPS3808G33DBVR reduces current draw by 75% but adds external components and removes MR pull-up-making MAX6712SEXS+T optimal for cost-sensitive, space-constrained 3.3V systems needing plug-and-play reset supervision.

Availability

MAX6712SEXS+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, intelligent instruments, critical µP and µC power monitoring, and computer embedded controller applications requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for MAX6712SEXS+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, emphasizing reliability, integration, and low-power operation.

The MAX6711/MAX6712/MAX6713 family was engineered specifically for microprocessor reset supervision in compact, battery-operated, and thermally harsh systems-delivering factory-trimmed accuracy, minimal external components, and guaranteed timing over extended temperature ranges.

FAQ

What is the exact reset threshold voltage of the MAX6712SEXS+T and how stable is it over temperature?

The MAX6712SEXS+T has a nominal reset threshold of 2.93V at +25°C, with ±1.5% initial accuracy and a maximum tempco of 30ppm/°C. Over the full -40°C to +125°C operating range, the threshold stays within 2.85V to 3.00V for the S-suffix variant, ensuring robust brownout detection without false triggering during thermal cycling. This stability is confirmed in the device's Electrical Characteristics table and Typical Operating Characteristics plots.

Does the MAX6712SEXS+T require an external pull-up resistor on its RESET pin?

No, the MAX6712SEXS+T does not require an external pull-up resistor because it features an active-high push-pull RESET output. Unlike open-drain variants (e.g., MAX6713), the MAX6712SEXS+T actively drives both high and low states-outputting ≥0.8×VCC when high and ≤0.4V when low-enabling direct connection to µP reset inputs without additional components. This is explicitly stated in the General Description and Pin Description sections of the datasheet.

How long is the reset pulse width generated by the MAX6712SEXS+T after power-up?

The MAX6712SEXS+T guarantees a minimum reset pulse width of 140ms after VCC rises above the 2.93V threshold. This timeout is fully specified over temperature (–40°C to +85°C: 140–240ms; +85°C to +125°C: 100–840ms) and ensures compliance with most microprocessor reset hold-time requirements. The actual duration varies with temperature but never falls below 140ms in the industrial range, as documented in the Reset Active Timeout Period parameter table.

Can the MAX6712SEXS+T operate with supply voltages below 3.3V, such as 2.5V or 1.8V?

Yes, the MAX6712SEXS+T operates with VCC from 1.2V to 5.5V across –40°C to +125°C. While its 2.93V reset threshold is optimized for +3.3V systems, the device remains functional at lower supplies-for example, asserting reset when a 2.5V rail sags below 2.93V (which cannot occur), so it would remain deasserted. However, its guaranteed reset validity down to VCC = +1V means it continues to drive correct logic levels even during deep brownout, supporting graceful shutdown sequences in multi-rail systems.

What is the function of the MR pin on the MAX6712SEXS+T and does it need external circuitry?

MR is an active-low manual reset input on the MAX6712SEXS+T with an internal 20kΩ pull-up resistor, allowing direct connection to ground via a momentary switch without external components. It asserts RESET while held low and holds RESET active for ≥140ms after release. MR accepts TTL/CMOS logic levels and has 100ns glitch immunity. Leaving MR unconnected defaults it to high via the internal pull-up-no external circuitry is required unless noise immunity is needed (e.g., 0.1µF capacitor to GND in EMI-heavy environments).