Analog Devices Inc./Maxim Integrated MAX6713MEXS+T

Overview

MAX6713MEXS+T from Maxim Integrated is a precision microprocessor supervisory circuit with open-drain active-low RESET output, designed to monitor +3.3V power supplies in embedded digital systems. It provides 4.38V reset threshold (±0.05V over -40°C to +125°C), 140ms minimum reset timeout, 12µA supply current at +25°C, and guaranteed reset validity down to VCC = +1V. It is used in portable equipment requiring reliable brownout detection and manual reset capability.

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, reset threshold accuracy for +3.3V systems, SC70-4 package footprint constraints, and low-quiescent-current operation in battery-powered designs.

Technical Context

The MAX6713MEXS+T implements a precision bandgap-based voltage comparator with 30ppm/°C tempco to maintain tight reset threshold stability across temperature. Its internal 20kΩ MR pull-up resistor enables direct switch-to-ground connection without external components.

Reset assertion occurs when VCC falls below 4.38V or MR is pulled low; reset remains asserted for ≥140ms after VCC rises above threshold or MR is released. The open-drain RESET output supports level-shifting up to +6.0V and interfaces natively with µPs like the Motorola 68HC11 that require bidirectional reset I/O.

Key Specifications

Pinout & Package

MAX6713MEXS+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 PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6712MEXS+T, the MAX6713MEXS+T offers open-drain flexibility for multi-rail reset coordination but requires a pull-up; compared with TPS3123M50DBVR, it delivers tighter threshold accuracy for +3.3V rails and integrated manual reset, at the cost of higher quiescent current.

Availability

MAX6713MEXS+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, intelligent instruments, computers, and critical µP power monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

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, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.

The MAX671x family targets compact, low-power microprocessor supervision in space- and energy-constrained systems, emphasizing threshold accuracy, temperature stability, and minimal external component count.

FAQ

What is the exact reset threshold voltage of the MAX6713MEXS+T and how does it vary with temperature?

The MAX6713MEXS+T has a nominal reset threshold of 4.38V at +25°C, with guaranteed limits of 4.25V to 4.50V over -40°C to +85°C and 4.16V to 4.56V over +85°C to +105°C. Its 30ppm/°C tempco ensures predictable drift, making it suitable for applications where supply margin must be tightly controlled across wide ambient conditions. This threshold is factory-trimmed and applies specifically to the 'M' variant in the MAX6713 family.

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

Yes, the MAX6713MEXS+T requires an external pull-up resistor on its open-drain RESET pin because it cannot drive high actively. The pull-up may connect to any voltage between 0V and +6.0V - including supplies higher than VCC - enabling level-shifting. Typical values range from 10kΩ to 100kΩ depending on bus capacitance and rise-time requirements. This feature is intrinsic to the MAX6713MEXS+T's open-drain architecture and distinguishes it from push-pull variants like MAX6711MEXS+T.

Can the MAX6713MEXS+T operate reliably when VCC drops below 1.0V, and what happens to the RESET output in that condition?

The MAX6713MEXS+T guarantees correct reset assertion down to VCC = +1.0V, but below that, the internal output stage ceases sinking current and becomes high-impedance. As a result, the RESET node will float unless externally biased. For applications requiring valid logic states down to 0V, a pull-down resistor (e.g., 100kΩ to GND) is recommended. This behavior is explicitly characterized and documented for the MAX6713MEXS+T in its absolute maximum and electrical characteristics tables.

How does the manual reset (MR) input of the MAX6713MEXS+T behave, and is external debounce required?

The MR input of the MAX6713MEXS+T is active-low, internally pulled up to VCC via a 20kΩ resistor, and accepts TTL/CMOS logic levels. Reset remains asserted while MR is low and for ≥140ms after MR returns high - providing built-in debouncing. No external RC network is needed for basic switch interfacing; however, a 0.1µF capacitor from MR to GND is advised in electrically noisy environments. This MR timing and internal pull-up are consistent across all MAX6713 variants, including the MAX6713MEXS+T.

What package type and dimensions does the MAX6713MEXS+T use, and is it RoHS-compliant?

The MAX6713MEXS+T uses a 4-pin SC70 package (outline X4-1), measuring 1.25mm × 0.85mm × 0.55mm with 0.65mm pin pitch. The "+T" suffix denotes lead-free, RoHS-compliant packaging per JEDEC J-STD-609. Land pattern 90-0187 is recommended for PCB layout. This compact footprint is identical across MAX6711/MAX6712/MAX6713 variants and enables high-density placement in portable and instrumentation designs.