Analog Devices Inc./Maxim Integrated MAX6719AUTTWD3+T

Overview

MAX6719AUTTWD3+T from Maxim Integrated is a dual-supply ultra-low-voltage microprocessor supervisory circuit with factory-trimmed VCC1 reset threshold of 4.625V (±125mV), VCC2 threshold of 3.075V (±75mV), and externally adjustable RSTIN input (626.5mV reference) for triple-voltage monitoring. It features push-pull active-low RST output, 280ms minimum reset timeout (D5 suffix), watchdog timer with 35s startup/1.12s normal mode, and operates from -40°C to +125°C in SOT23-6 package. Used in telecom power management to ensure reliable boot and brownout recovery.

For engineers reviewing the MAX6719AUTTWD3+T datasheet, MAX6719AUTTWD3+T pinout, MAX6719AUTTWD3+T application, or MAX6719AUTTWD3+T equivalent, this page delivers verified specifications, validated pin functions, confirmed dual-supply supervision behavior, and real-world design context for multivoltage embedded systems requiring AEC-Q100–grade reliability and low-quiescent-current operation.

Technical Context

The MAX6719AUTTWD3+T integrates two independent voltage comparators for primary (VCC1) and secondary (VCC2) supply monitoring, plus a high-impedance RSTIN input referenced to an internal 626.5mV bandgap. Its reset logic asserts RST low when any monitored supply falls below its threshold and holds it for a guaranteed 280ms after all supplies recover - with restartable timeout if voltage dips recur mid-timer.

It includes a dual-mode watchdog timer: 35s minimum initial period post-reset for system initialization, then automatic transition to 1.12s normal timeout on first WDI edge detection. The device guarantees valid reset state down to VCC1 or VCC2 = 0.8V and supports manual reset via MR with 200ns delay and 1µs minimum pulse width.

Key Specifications

Pinout & Package

MAX6719AUTTWD3+T is housed in a RoHS-compliant 6-pin SOT23 package (package code U6+1A, outline 21-0058), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and 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 MAX6719AUTTWD3+T, MAX6720AUTTWD3+T removes RSTIN but retains identical timing and package - making it a lower-cost alternative for simpler dual-rail designs; TPS3808G33DBVR provides minimal reset functionality at lower price but cannot replace the triple-monitoring, watchdog, and manual-reset capabilities of the MAX6719AUTTWD3+T.

Availability

MAX6719AUTTWD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, automotive infotainment, and industrial PLC applications requiring stable component supply, extended temperature operation, and AEC-Q100–aligned reliability.

Supply support for MAX6719AUTTWD3+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, automotive, and communications applications.

The MAX6715A–MAX6729A family delivers ultra-low-voltage supervisory circuits optimized for multirail systems where space, power, and reliability are critical - targeting applications needing simultaneous VCC1/VCC2 monitoring plus flexible third-rail supervision.

FAQ

What is the exact reset timeout period for MAX6719AUTTWD3+T?

The MAX6719AUTTWD3+T has a guaranteed minimum reset timeout period of 280ms, corresponding to the 'D5' suffix in its part number. This value is production-tested and specified over the full -40°C to +125°C operating range. The actual timeout may extend up to 560ms depending on process and temperature variation, but system design must rely on the 280ms minimum guarantee for timing-critical initialization sequences.

Does MAX6719AUTTWD3+T support manual reset functionality?

Yes, MAX6719AUTTWD3+T includes an active-low manual-reset input (MR) with internal 50kΩ pullup to VCC1. Pulling MR low forces an immediate reset assertion, which remains active for the full 280ms timeout period after MR returns high. The input accepts standard CMOS logic levels and tolerates pulses as short as 1µs, enabling use with momentary switches or digital control signals without external debounce circuitry.

Can MAX6719AUTTWD3+T monitor a 1.2V core supply?

Yes, MAX6719AUTTWD3+T can monitor a 1.2V core supply using its RSTIN pin. With the internal 626.5mV reference, a resistor divider (e.g., R1 = 1.0MΩ, R2 = 1.1MΩ) sets the trip point precisely at 1.2V. The RSTIN input draws only ±100nA, enabling high-value resistors that minimize current draw - critical for battery-powered systems where the 1.2V rail must be supervised without loading.

Is MAX6719AUTTWD3+T qualified for automotive applications?

While MAX6719AUTTWD3+T itself is not AEC-Q100 certified, the MAX6719AUTTWD1/V+T variant is explicitly listed as AEC-Q100 qualified in the datasheet. The MAX6719AUTTWD3+T shares identical silicon, package, and electrical specifications - differing only in reset threshold options and timeout suffix. Customers requiring automotive qualification should verify compliance documentation with Maxim/Analog Devices for their specific use case and temperature grade.

What is the maximum supply voltage the MAX6719AUTTWD3+T can tolerate on VCC1 and VCC2?

MAX6719AUTTWD3+T supports absolute maximum supply voltages of +6V on both VCC1 and VCC2 pins, with recommended operating range from 0.8V to 5.5V per supply. Operation above 5.5V risks permanent damage, while operation below 0.8V invalidates reset output logic guarantees. For robust 5V system designs, the 4.625V VCC1 threshold provides 375mV noise margin - sufficient to reject typical switching regulator ripple and transient spikes.