Analog Devices Inc./Maxim Integrated MAX6726KAWGD3+T

Overview

MAX6726KAWGD3+T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in an 8-pin SOT23 package, monitoring VCC1 (primary), VCC2 (secondary), and RSTIN (auxiliary) supply rails with factory-trimmed thresholds of 2.925V (VTH1), 2.188V (VTH2), and 626.5mV (RSTIN reference). It provides push-pull active-low RST and RST2 outputs, manual reset input (MR), watchdog timer (1.12s normal / 35s startup timeout), and guaranteed reset validity down to VCC1 or VCC2 = 0.8V. It is used in multivoltage embedded systems requiring reliable power-on reset and brownout detection.

For engineers reviewing the MAX6726KAWGD3+T datasheet, MAX6726KAWGD3+T pinout, MAX6726KAWGD3+T application, or MAX6726KAWGD3+T equivalent, key selection factors include its triple-supply monitoring capability, 210ms (min) reset timeout, push-pull output drive referenced to VCC1/VCC2, watchdog dual-mode timing, and operation across –40°C to +85°C industrial temperature range.

Technical Context

The MAX6726KAWGD3+T integrates three independent voltage comparators - one for VCC1 (2.925V threshold), one for VCC2 (2.188V threshold), and one for RSTIN (626.5mV internal reference) - each feeding into a shared reset timeout timer. Its dual-mode watchdog uses a 35s minimum startup period after any reset event, then transitions to a 1.12s minimum normal timeout upon first WDI edge detection.

This device implements push-pull reset outputs (RST and RST2) with VOH ≥ 0.8×VCC1/VCC2 and VOL ≤ 0.4V at full load, eliminating external pullups. MR features a 50kΩ internal pullup to VCC1, and RSTIN supports externally adjustable monitoring down to 0.62V via resistor divider, with <25nA input current and 3mV hysteresis.

Key Specifications

Pinout & Package

MAX6726KAWGD3+T is housed in an 8-pin SOT23-8 package (2.0mm × 2.1mm × 1.25mm), optimized for space-constrained PCB layouts while supporting thermal reliability up to +85°C ambient.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar triple-voltage supervisory applications.

Compared with MAX6726KAWGD3+T, MAX6726KAUD3+T trades push-pull drive for open-drain flexibility, while TPS3808G33DBVR reduces feature set to dual monitoring only-making MAX6726KAWGD3+T the sole option among these three supporting simultaneous triple-rail supervision with integrated watchdog and push-pull outputs.

Availability

MAX6726KAWGD3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom line cards, medical diagnostic imaging systems, and automotive ADAS ECUs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6726KAWGD3+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.

The MAX6715–MAX6729 family was designed to replace discrete reset circuits in multivoltage embedded systems, delivering compact, factory-calibrated supervision with configurable timing and multiple monitoring channels.

FAQ

What is the exact reset threshold voltage for VCC1 on the MAX6726KAWGD3+T?

The MAX6726KAWGD3+T has a factory-trimmed VCC1 reset threshold of 2.925V (typical), with tolerance of ±1.5% over temperature. This value is encoded in the "W" suffix per Maxim's Reset Voltage Threshold Suffix Guide and is guaranteed across –40°C to +85°C without external calibration. The MAX6726KAWGD3+T uses this precise threshold to supervise 3.3V primary rails in telecom and industrial applications.

Does the MAX6726KAWGD3+T support monitoring a third voltage rail, and how is it configured?

Yes, the MAX6726KAWGD3+T supports third-rail monitoring via its RSTIN pin, which compares the applied voltage against an internal 626.5mV reference. To monitor a custom voltage (e.g., 1.2V), connect a resistor divider between the rail and GND, with the midpoint fed to RSTIN. The MAX6726KAWGD3+T's <25nA RSTIN input current ensures minimal loading and high accuracy with standard resistor values.

What are the reset timeout and watchdog timing characteristics of the MAX6726KAWGD3+T?

The MAX6726KAWGD3+T provides a minimum reset timeout period of 210ms (encoded by "D3" suffix) and a dual-mode watchdog: 35s minimum startup timeout after power-up or reset, transitioning to 1.12s minimum normal timeout after the first WDI edge. These timings are production-tested and temperature-compensated, ensuring reliable boot sequencing and runtime fault detection in the MAX6726KAWGD3+T.

How does the MAX6726KAWGD3+T handle manual reset and what is the MR input behavior?

The MAX6726KAWGD3+T features an active-low MR input with a 50kΩ internal pullup to VCC1. Pulling MR low forces immediate reset assertion, which remains active for the full 210ms timeout after MR returns high. MR accepts TTL/CMOS logic levels and requires no external debounce; a momentary switch to GND suffices. This behavior is fully specified in the MAX6726KAWGD3+T electrical characteristics table under MR Minimum Pulse Width (1µs) and MR Glitch Rejection (100ns).

What package type and pin count does the MAX6726KAWGD3+T use, and is it lead-free?

The MAX6726KAWGD3+T is supplied in an 8-pin SOT23-8 package (2.0mm × 2.1mm footprint) and is lead-free, as indicated by the "+T" suffix per Maxim's ordering conventions. This package supports reflow soldering per JEDEC J-STD-020 and is rated for operation from –40°C to +85°C. The MAX6726KAWGD3+T's compact size and RoHS compliance make it suitable for high-density industrial and telecom PCBs.