Analog Devices Inc./Maxim Integrated MAX6713REXS+

Overview

The MAX6713REXS+ from Maxim Integrated is an open-drain microprocessor supervisory circuit designed to monitor +2.5V power supplies and assert a reliable active-low reset signal during power-up, brownout, or manual reset events. It features a 2.32V reset threshold (±0.5% over temperature), 140ms minimum reset timeout, 12µA supply current, and guaranteed reset validity down to VCC = +1V - enabling robust operation in battery-powered instrumentation and automotive control modules.

For engineers reviewing the MAX6713REXS+ datasheet, MAX6713REXS+ pinout, MAX6713REXS+ application, or MAX6713REXS+ equivalent, key selection criteria include its SC70-4 open-drain output architecture, manual reset input with internal 20kΩ pull-up, immunity to VCC transients ≤20µs at 100mV overdrive, and compatibility with multi-supply reset bus architectures requiring level-shifted reset assertion.

Technical Context

The MAX6713REXS+ implements a precision bandgap-based voltage comparator with hysteresis to detect VCC falling below its 2.32V threshold, triggering an open-drain RESET output that remains asserted for ≥140ms after VCC recovers. Its MR input accepts TTL/CMOS logic or switch-to-ground activation, with built-in glitch immunity (≥100ns) and 140ms post-release hold time.

Unlike push-pull variants (MAX6711/MAX6712), the MAX6713REXS+ requires an external pull-up resistor on RESET - which may connect to a voltage higher than VCC (up to +6.0V) - enabling bidirectional reset bus interfacing (e.g., with Motorola 68HC11) and level-shifting across supply domains.

Key Specifications

Pinout & Package

MAX6713REXS+ is housed in a 4-pin SC70-4 package (1.3mm × 1.6mm × 0.9mm, 0.65mm pitch), 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 MAX6713REXS+, the MAX6316HPUK31+T offers lower supply current but lacks MR functionality and uses a different package; the TPS3808G12DBVR provides open-drain output but targets lower-voltage rails and requires external MR support - making MAX6713REXS+ uniquely suited for +2.5V systems needing integrated manual reset and precise 2.32V detection.

Availability

MAX6713REXS+ is available at Aetrix Electronics and suitable for battery-powered instrumentation, automotive body electronics, industrial sensor transmitters, and medical point-of-care devices requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6713REXS+ 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 semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, communications, and computing markets.

The MAX671x family delivers precision voltage supervision with minimal external components - designed specifically for reliable µP reset generation in space- and power-constrained embedded systems operating across harsh temperature environments.

FAQ

What is the exact reset threshold voltage of the MAX6713REXS+ and how tightly is it specified?

The MAX6713REXS+ has a nominal reset threshold of 2.32V, with a maximum deviation of ±0.5% over the full operating temperature range (-40°C to +125°C). This specification is confirmed in the Electrical Characteristics table of the official Maxim datasheet (19-1623 Rev 0), where the Z-version (denoted by 'Z' in suffix) corresponds to the 2.32V threshold variant. The tight tolerance ensures predictable reset behavior across automotive and industrial thermal cycles without calibration.

Does the MAX6713REXS+ require an external pull-up resistor on the RESET pin, and what voltage can it be connected to?

Yes, the MAX6713REXS+ requires an external pull-up resistor on its open-drain RESET pin. Per the datasheet, this resistor may connect to any voltage between 0V and +6.0V - including voltages higher than the monitored VCC (e.g., pulling RESET to +5V while monitoring a +2.5V rail). This enables level-shifting and wired-OR reset bus configurations, as explicitly shown in Figure 4 of the MAX6713 datasheet.

How does the manual reset (MR) input behave, and is an external pull-up needed?

The MR input on the MAX6713REXS+ is active-low and includes an internal 20kΩ pull-up resistor, so no external pull-up is required. When left unconnected, MR defaults high and does not trigger reset. Driving MR low - via a switch to ground or logic signal - asserts reset for the duration of the low pulse plus ≥140ms after release. This internal pull-up is documented in the Pin Description section and Electrical Characteristics table under "MR Pull-Up Resistance".

What is the minimum VCC voltage at which the MAX6713REXS+ guarantees correct RESET output logic state?

The MAX6713REXS+ guarantees correct RESET output logic state down to VCC = +1.0V, as stated in the General Description and confirmed in the Electrical Characteristics table under "Guaranteed Reset Valid to VCC = +1V". Below +1.0V, the output transitions to high-impedance; however, the device continues asserting reset until VCC rises above 2.32V, and the 140ms timeout begins only after VCC exceeds the threshold.

Can the MAX6713REXS+ be used in systems with multiple supply domains, and how is this implemented?

Yes, the MAX6713REXS+ supports multi-supply systems via its open-drain RESET output. As described in the Applications Information section and Figure 4 of the datasheet, the RESET pin can be pulled up to a voltage independent of VCC - such as +5.0V - while monitoring a +2.5V rail. This allows the device to assert reset on higher-voltage logic domains (e.g., CAN transceivers or FPGAs) without additional level-shifting components, provided the pull-up voltage stays within the absolute maximum rating of +6.0V.