Analog Devices Inc./Maxim Integrated MAX6713LEXS+T

Overview

MAX6713LEXS+T from Maxim Integrated is a precision microprocessor supervisory circuit with open-drain active-low 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 ≥140ms power-on-reset timeout. Used in critical µP power monitoring for industrial controllers and portable equipment.

For engineers reviewing the MAX6713LEXS+T datasheet, MAX6713LEXS+T pinout, MAX6713LEXS+T application, or MAX6713LEXS+T equivalent, key selection criteria include its 4.63V reset threshold, open-drain RESET output requiring external pull-up, 12µA supply current at +25°C, and guaranteed operation from -40°C to +125°C in SC70-4 package.

Technical Context

The MAX6713LEXS+T implements a precision bandgap-based voltage comparator with 30ppm/°C tempco to detect VCC drops below 4.63V across full temperature range. Its reset logic includes internal debouncing and a fixed 140ms minimum timeout after VCC recovery or MR release.

It features an internal 20kΩ pull-up on the MR input, accepts TTL/CMOS logic levels, and supports manual reset assertion via momentary switch to GND. The open-drain RESET output allows level-shifting and bidirectional reset interfacing-e.g., with Motorola 68HC11-when pulled up to a voltage ≤6.0V.

Key Specifications

Pinout & Package

MAX6713LEXS+T is housed in a 4-pin SC70 (X4-1) package, measuring 2.0mm × 2.1mm × 0.95mm, with gull-wing leads and RoHS-compliant lead-free finish (+T suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6711LEXS+T, MAX6713LEXS+T trades push-pull simplicity for open-drain versatility-enabling level-shifted reset and bidirectional I/O-but requires a pull-up resistor. Versus TPS3808G18DBVR, it targets +5V systems with manual reset and tighter threshold accuracy, making it unsuitable for sub-3V rails.

Availability

MAX6713LEXS+T is available at Aetrix Electronics and suitable for industrial controllers, portable instrumentation, critical µP power monitoring, and intelligent test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6713LEXS+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 high-performance analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.

The MAX671x family delivers precision, low-power µP supervisory functions in ultra-small SC70 packages-targeting space-constrained, battery-sensitive, and thermally rugged embedded systems.

FAQ

What is the reset threshold voltage of the MAX6713LEXS+T?

The MAX6713LEXS+T has a nominal reset threshold of 4.63V, with ±1.5% tolerance over the full operating temperature range (-40°C to +125°C). This value is laser-trimmed at wafer test and specified in the Electrical Characteristics table under VTH for MAX671_L versions. It ensures reliable detection of brownout conditions on +5.0V rails before µP functional failure occurs.

Does the MAX6713LEXS+T require an external pull-up resistor on the RESET pin?

Yes, the MAX6713LEXS+T uses an open-drain RESET output and requires an external pull-up resistor to a voltage between 0V and 6.0V. Typical values range from 10kΩ to 100kΩ depending on bus capacitance and rise-time requirements. Without this resistor, the RESET signal cannot achieve a valid high logic state, rendering the device nonfunctional in most µP reset configurations.

Can the MAX6713LEXS+T operate with supply voltages below 5.0V?

Yes, the MAX6713LEXS+T operates with VCC from 1.0V to 5.5V. However, its reset threshold is fixed at 4.63V, so it is intended specifically for +5.0V systems. At VCC < 4.63V, the device asserts reset continuously. It remains functional-asserting valid logic states-down to VCC = +1.0V, enabling robust power-down sequencing in +5V applications.

What is the purpose of the MR pin on the MAX6713LEXS+T?

MR is the active-low manual reset input on the MAX6713LEXS+T. It allows external initiation of reset via a pushbutton, test equipment, or control logic. When MR is pulled low, RESET asserts immediately and remains asserted for ≥140ms after MR returns high. An internal 20kΩ pull-up resistor eliminates the need for external biasing, and the input accepts standard TTL/CMOS logic levels.

Is the MAX6713LEXS+T compatible with bidirectional µP reset pins?

Yes, the MAX6713LEXS+T's open-drain RESET output makes it inherently compatible with bidirectional µP reset I/O, such as those found on Motorola 68HC11 derivatives. By connecting RESET directly to the µP's bidirectional reset pin with a shared pull-up resistor, either the MAX6713LEXS+T or the µP can drive the line low to initiate system reset-enabling flexible, multi-source reset arbitration without additional logic.