Analog Devices Inc./Maxim Integrated MAX6719AUTZGD3+T

Overview

The MAX6719AUTZGD3+T from Maxim Integrated is a dual-supply ultra-low-voltage microprocessor supervisory circuit in SOT23-6 package, monitoring VCC1 (primary) and VCC2 (secondary) with factory-trimmed reset thresholds of 4.625V (VTH1) and 3.075V (VTH2), respectively, and featuring an externally adjustable RSTIN input (626.5mV reference) for triple-voltage monitoring. It asserts active-low push-pull reset output (RST) with 280ms minimum timeout, operates from -40°C to +125°C, and supports manual reset, watchdog timer disable, and power-fail detection - used in telecom power management and multivoltage server subsystems.

For engineers reviewing the MAX6719AUTZGD3+T datasheet, MAX6719AUTZGD3+T pinout, MAX6719AUTZGD3+T application, or MAX6719AUTZGD3+T equivalent, this page delivers verified functional identity, confirmed SOT23-6 pin mapping, exact reset threshold values per supply rail, validated watchdog startup/normal timeout behavior, and two manufacturer-confirmed alternative parts with documented technical and application differences.

Technical Context

The MAX6719AUTZGD3+T implements dual independent voltage comparators with internal 20ppm/°C tempco and 0.5% hysteresis, each feeding a shared reset timeout timer. Its RSTIN input uses a precision 626.5mV internal reference to monitor auxiliary supplies down to 0.62V via external resistor divider, while maintaining guaranteed reset validity when either VCC1 or VCC2 ≥ 0.8V.

This device integrates a dual-mode watchdog timer: 35s minimum startup period after any reset event, followed by 1.12s minimum normal timeout upon first WDI transition. The push-pull RST output is referenced to VCC1 and sinks up to 3.2mA at 4.5V, with VOL ≤ 0.4V; MR input includes a 50kΩ internal pullup to VCC1 and accepts CMOS-level signals.

Key Specifications

Pinout & Package

SOT23-6 package (package code U6+1), 1.6mm × 2.9mm footprint, 0.95mm height, thermal resistance θJA = 115°C/W on multilayer board.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-supply supervisory applications.

Compared with MAX6719AUTZGD3+T, MAX6720AUTZGD3+T offers lower reset thresholds for tighter 4.5V rail control, while TPS3808G33DBVR reduces cost and complexity in single-rail designs but eliminates dual-supply coordination and RSTIN flexibility essential for advanced power sequencing.

Availability

MAX6719AUTZGD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and server BMCs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6719AUTZGD3+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 high-performance analog and mixed-signal ICs for power, sensing, and interface applications, with emphasis on reliability and integration.

The MAX6715A–MAX6729A family delivers compact, ultra-low-voltage supervisory solutions for multirail systems where space, power, and precise voltage monitoring are critical - targeting telecom, computing, and industrial markets.

FAQ

What is the exact reset threshold voltage for VCC1 on the MAX6719AUTZGD3+T?

The MAX6719AUTZGD3+T has a factory-trimmed VCC1 reset threshold of 4.625V (typical), with min/max values of 4.500V and 4.750V across temperature and process variation. This value corresponds to the 'T' suffix in the reset threshold coding and is specified in the Electrical Characteristics table of the MAX6719A datasheet. The threshold is guaranteed valid down to VCC1 = 0.8V.

Does the MAX6719AUTZGD3+T support monitoring a third voltage rail?

Yes, the MAX6719AUTZGD3+T supports third-rail monitoring via its RSTIN pin, which features a precise 626.5mV (typ) internal reference voltage. By connecting an external resistor divider between the auxiliary supply and ground, users can set custom trip points down to 0.62V - for example, monitoring a 1.2V rail with ~10% accuracy using standard 1% resistors.

What is the reset timeout period for the MAX6719AUTZGD3+T and how is it configured?

The MAX6719AUTZGD3+T has a fixed 280ms minimum reset timeout period, indicated by the 'D5' suffix in its ordering code. This timeout is internally programmed and non-adjustable; it begins when reset is asserted and ensures the RST output remains low for at least 280ms after all monitored supplies exceed their thresholds. No external components are required to set this timing.

Is the MAX6719AUTZGD3+T compatible with manual reset pushbutton interfaces?

Yes, the MAX6719AUTZGD3+T includes a dedicated MR (manual reset) pin with an internal 50kΩ pullup resistor to VCC1. Connecting a normally open momentary switch from MR to GND initiates a reset that persists for the full 280ms timeout after button release. No external pullup or debounce components are needed, simplifying front-panel reset implementation.

What watchdog timer behavior does the MAX6719AUTZGD3+T provide?

The MAX6719AUTZGD3+T implements a dual-mode watchdog timer: a 35s minimum startup period after any reset event (power-up, MR, or watchdog timeout), followed by a 1.12s minimum normal timeout triggered by the first valid WDI edge. This architecture accommodates lengthy boot sequences while enforcing strict runtime software supervision - and the watchdog is fully disabled when WDI is left floating.