Analog Devices Inc./Maxim Integrated MAX6713MEXS-T

Overview

MAX6713MEXS-T from Maxim Integrated is a 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 (±0.07V), guarantees reset validity down to VCC = +1V, and provides 140ms minimum power-on-reset timeout. Used in portable equipment, intelligent instruments, and critical µP power monitoring.

For engineers reviewing the MAX6713MEXS-T datasheet, MAX6713MEXS-T pinout, MAX6713MEXS-T application, or MAX6713MEXS-T equivalent, key selection criteria include open-drain output 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-T implements a precision bandgap-based voltage comparator with 30ppm/°C tempco to detect VCC drops below its factory-trimmed 4.38V threshold. Its reset logic includes built-in hysteresis and glitch immunity-ignoring transients ≤100ns on MR and rejecting VCC glitches ≤20µs at 100mV overdrive.

Unlike push-pull variants, the open-drain RESET output requires an external pull-up resistor (0–6V compatible) and enables level-shifting or wired-OR reset bus configurations. The MR input accepts TTL/CMOS logic or switch-to-ground activation, with reset asserted for ≥140ms after MR deassertion.

Key Specifications

Pinout & Package

MAX6713MEXS-T is housed in a 4-pin SC70 package (outline X4-1, land pattern 90-0187), measuring 1.25mm × 1.25mm × 0.9mm with 0.65mm pitch. This ultra-compact footprint supports high-density PCB layouts in space-constrained portable devices.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6713MEXS-T, MAX6713TEXS-T offers tighter threshold accuracy for 3.0V systems but identical timing and interface behavior, while TPS3808G33DBVR trades manual reset and ultra-low current for longer reset timeout and different packaging-requiring layout revision and careful thermal validation.

Availability

MAX6713MEXS-T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, intelligent instruments, critical µP and µC power monitoring, and computers requiring stable component supply across industrial temperature grades.

Supply support for MAX6713MEXS-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 industrial, automotive, communications, and computing markets.

The MAX671x family delivers highly accurate, low-power microprocessor supervisory circuits targeting space- and power-constrained embedded systems requiring deterministic reset behavior across extreme temperatures.

FAQ

What is the reset threshold voltage of the MAX6713MEXS-T?

The MAX6713MEXS-T has a factory-trimmed reset threshold of 4.38V ±0.07V at +25°C, with guaranteed operation from –40°C to +125°C. This value is specifically calibrated for reliable supervision of +3.3V supply rails, ensuring reset assertion occurs before the microprocessor enters unstable operating regions. The MAX6713MEXS-T maintains this accuracy with a 30ppm/°C temperature coefficient, making it suitable for industrial environments where ambient temperature fluctuates significantly.

Does the MAX6713MEXS-T require an external pull-up resistor on the RESET pin?

Yes, the MAX6713MEXS-T features an open-drain RESET output and requires an external pull-up resistor to establish a defined logic-high voltage. The pull-up can connect to any supply between 0V and 6.0V-including voltages higher than VCC-enabling level-shifting applications. A typical value is 10kΩ to 100kΩ, selected based on rise time requirements and bus loading. Without this resistor, the RESET signal remains floating and cannot drive downstream logic reliably. The MAX6713MEXS-T itself does not integrate this pull-up.

How long does the reset pulse last after power is applied to the MAX6713MEXS-T?

The MAX6713MEXS-T guarantees a minimum reset pulse width of 140ms after VCC rises above the 4.38V threshold, with typical duration up to 240ms at –40°C to +85°C and up to 460ms at +85°C to +125°C. This extended timeout ensures complete microprocessor initialization, including PLL lock, memory self-test, and boot ROM execution, before release. The timing is internally generated and independent of external capacitors, eliminating variability due to component tolerances or aging.

Can the MAX6713MEXS-T operate with a supply voltage below 3.3V?

Yes, the MAX6713MEXS-T operates with VCC from 1.0V to 5.5V across the full –40°C to +125°C range. While its 4.38V reset threshold is optimized for +3.3V systems, the device continues to assert RESET correctly down to VCC = +1V-ensuring deterministic behavior during deep brownout. However, below ~2.5V, the internal comparator may lose accuracy, and the RESET output transitions to high-impedance mode. For reliable operation under sustained low-VCC conditions, a 100kΩ pull-down on RESET is recommended to prevent floating states.

What is the function of the MR pin on the MAX6713MEXS-T?

The MR (Manual Reset) pin on the MAX6713MEXS-T is an active-low input that forces RESET assertion when pulled low, with built-in 20kΩ internal pull-up resistance. It accepts TTL/CMOS logic levels or direct connection to ground via a momentary switch-no external components required. RESET remains asserted for at least 140ms after MR returns high, providing hardware-debounced reset initiation. This feature enables field service recovery, test-mode entry, and operator-triggered reboots without modifying firmware or adding discrete debounce circuitry.