Analog Devices Inc./Maxim Integrated MAX6713TEXS

Overview

MAX6713TEXS from Maxim Integrated is an open-drain microprocessor supervisory circuit designed to monitor +3.3V power supplies and assert a reliable reset signal during power-up, brownout, or manual reset events. It features a 2.93V reset threshold (±1.5% over temperature), 140ms minimum reset timeout, 12µA supply current, and guaranteed reset validity down to VCC = +1V. It is used in portable embedded systems requiring precise, low-power supply monitoring with manual reset capability.

For engineers reviewing the MAX6713TEXS datasheet, MAX6713TEXS pinout, MAX6713TEXS application, or MAX6713TEXS equivalent, key selection considerations include its open-drain RESET output for level-shifting or bidirectional µP interface, SC70-4 package footprint, -40°C to +125°C operating range, and compatibility with 3.3V logic domains where pull-up voltage may exceed VCC.

Technical Context

The MAX6713TEXS implements a precision bandgap-based voltage comparator to detect VCC falling below its 2.93V threshold, with <50ppm/°C tempco and immunity to transients ≤20µs at 100mV overdrive. Its internal 20kΩ MR pull-up enables direct switch-to-ground connection without external components.

Reset assertion persists for ≥140ms after VCC rises above threshold or MR deassertion; the open-drain RESET output requires an external pull-up and supports interfacing with µPs having bidirectional reset pins (e.g., Motorola 68HC11) or multi-supply reset networks where pull-up voltage differs from VCC.

Key Specifications

Pinout & Package

MAX6713TEXS is housed in a 4-pin SC70 package with 0.65mm pitch. The package is lead-free (RoHS-compliant) and rated for operation from -40°C to +125°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6713TEXS, MAX6326UT31D offers lower current but lacks open-drain versatility, while TPS3808G33DBVR provides superior threshold accuracy and longer timeout but omits manual reset and requires layout changes due to 5-pin packaging.

Availability

MAX6713TEXS is available at Aetrix Electronics and suitable for portable medical monitors, automotive body control units, industrial PLC I/O modules, and smart sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6713TEXS 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 power, sensing, and interface applications in industrial, automotive, and communications markets.

The MAX671x family delivers precision, low-power microprocessor supervision for 2.5V–5.0V systems, targeting space-constrained and battery-sensitive applications where reliability under voltage transients is critical.

FAQ

What is the reset threshold voltage of the MAX6713TEXS and how tightly is it specified?

The MAX6713TEXS has a nominal reset threshold of 2.93V, specified with ±1.5% tolerance over the full operating temperature range of -40°C to +125°C. This tight specification ensures consistent brownout detection in 3.3V systems without requiring external calibration. The threshold is factory-trimmed and does not drift significantly with aging or humidity, making MAX6713TEXS suitable for mission-critical embedded applications where supply margin is minimal.

Does the MAX6713TEXS require an external pull-up resistor on the RESET pin, and what voltage can it tolerate?

Yes, the MAX6713TEXS requires an external pull-up resistor on its open-drain RESET pin because it cannot drive high actively. The RESET pin is rated for voltages up to +6.0V, allowing the pull-up to connect to any supply between 0V and 6V - including rails higher than VCC (e.g., 5V pull-up on a 3.3V-monitored device). Typical values range from 10kΩ to 100kΩ depending on bus capacitance and drive strength requirements.

How long does the reset signal remain asserted after VCC recovers above the threshold?

The MAX6713TEXS guarantees a minimum reset assertion time of 140ms after VCC rises above the 2.93V threshold. This timeout is internally generated and fully temperature-compensated, eliminating dependence on external RC networks. The 140ms duration satisfies startup timing requirements for most 32-bit microcontrollers and FPGAs, ensuring complete initialization before code execution resumes.

Can the MAX6713TEXS operate reliably when VCC drops below 1.0V?

The MAX6713TEXS guarantees correct reset logic state (low output) for VCC down to +1.0V. Below 1.0V, the internal output transistor ceases sinking current and the RESET pin becomes high-impedance. For applications requiring valid reset signaling down to 0V, a 100kΩ pull-down resistor on the RESET line is recommended - this ensures the signal remains low during deep brownout, preventing undefined states at the µP reset input.

Is a manual reset input provided, and what are its electrical characteristics?

Yes, the MAX6713TEXS includes an active-low manual reset (MR) input with an internal 20kΩ pull-up resistor. MR accepts standard TTL/CMOS logic levels (VIH ≥0.7·VCC, VIL ≤0.3·VCC) and can be driven directly by a microcontroller GPIO or a momentary switch to ground. No external debounce components are needed, and the input is immune to glitches shorter than 100ns, simplifying system-level reset control architecture.