Analog Devices Inc./Maxim Integrated MAX6713MEXS

Overview

MAX6713MEXS from Maxim Integrated is a precision microprocessor supervisory circuit with open-drain active-low RESET output, designed to monitor +3.3V supply rails in embedded systems. It asserts reset when VCC falls below 4.38V (±1.5% over temperature), guarantees reset validity down to VCC = +1V, features 12µA quiescent current, and provides 140ms minimum reset timeout-ideal for portable and automotive power-monitoring applications.

For engineers reviewing the MAX6713MEXS datasheet, MAX6713MEXS pinout, MAX6713MEXS application, or MAX6713MEXS equivalent, key selection criteria include its 4.38V reset threshold tolerance, SC70-4 open-drain interface compatibility with bidirectional µP reset pins, manual reset input with internal 20kΩ pull-up, and guaranteed operation across –40°C to +125°C.

Technical Context

The MAX6713MEXS implements a precision bandgap-based voltage comparator with hysteresis to detect VCC drops below its factory-trimmed 4.38V threshold. Its reset assertion logic includes built-in 140ms timer that holds RESET low after VCC recovery or MR deassertion, independent of external timing components.

Its open-drain RESET output supports level-shifting-e.g., monitoring a +3.3V rail while pulling up to +5V-enabling interoperability with mixed-voltage µPs like the Motorola 68HC11. The MR input accepts TTL/CMOS logic or switch-to-ground, with 100ns glitch immunity and no external debounce required.

Key Specifications

Pinout & Package

MAX6713MEXS is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm × 0.9mm), optimized for space-constrained PCB layouts in portable and automotive modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6713MEXS, MAX6326UR33-T offers lower quiescent current but lacks open-drain output and manual reset; TPS3808G33DBVR adds watchdog capability but increases BOM count and layout complexity-making MAX6713MEXS optimal for cost-sensitive, space-constrained designs needing pure reset supervision with level-shifting.

Availability

MAX6713MEXS is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O cards, portable medical monitors, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6713MEXS 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, and communications markets.

The MAX671x family delivers precision, low-power supervisory circuits for microprocessor reset applications-designed specifically to replace discrete reset solutions in space- and power-constrained embedded systems.

FAQ

What is the exact reset threshold voltage for MAX6713MEXS and how tightly is it specified?

The MAX6713MEXS has a factory-trimmed reset threshold of 4.38V, specified with ±1.5% tolerance over the full –40°C to +125°C operating temperature range. This value is confirmed in the Selector Guide and Electrical Characteristics table of the official datasheet, and applies exclusively to the "M" suffix variant within the MAX6713 family. No external calibration is needed to achieve this accuracy.

Does MAX6713MEXS require an external pull-up resistor on the RESET pin, and what voltage can it be connected to?

Yes, MAX6713MEXS requires an external pull-up resistor on its open-drain RESET pin. The datasheet explicitly states the pull-up may connect to any voltage between 0V and +6.0V-including supplies higher than VCC (e.g., +5V pull-up while monitoring a +3.3V rail). Typical values range from 10kΩ to 100kΩ depending on bus capacitance and drive strength requirements.

Can MAX6713MEXS operate reliably when the monitored VCC supply drops below 1.0V?

MAX6713MEXS guarantees correct RESET logic state only down to VCC = +1.0V. Below this, the internal output stage ceases sinking current and becomes high-impedance. For applications requiring valid RESET down to 0V, a 100kΩ pull-down resistor on the RESET line is recommended-as documented in the "Ensuring a Valid Reset Output Down to VCC = 0" section of the datasheet.

How does the manual reset (MR) input behave, and is external debouncing necessary?

The MR input on MAX6713MEXS is active-low with an internal 20kΩ pull-up resistor, accepting TTL/CMOS logic levels or direct switch-to-ground connection. The datasheet confirms no external debounce circuitry is required-the device includes 100ns glitch immunity and holds reset asserted for ≥140ms after MR is released, ensuring clean reset initiation in noisy environments.

What is the maximum allowable negative-going VCC transient that MAX6713MEXS can ignore without asserting reset?

At 25°C, MAX6713MEXS rejects negative VCC transients of ≤20µs duration when the overdrive (VTH – VCC) is ≤100mV-verified in Figure 1 of the datasheet. For larger overdrives (e.g., 200mV), the maximum tolerable pulse width reduces to ~5µs. A 0.1µF bypass capacitor placed near the VCC pin further enhances immunity per the Applications Information section.