Analog Devices Inc./Maxim Integrated MAX6719AUTTWD1+T

Overview

The MAX6719AUTTWD1+T from Maxim Integrated is a dual-supply ultra-low-voltage microprocessor supervisory circuit in SOT23-6 package, monitoring VCC1 (1.8V–5.0V) and VCC2 (0.9V–3.3V) with factory-trimmed reset thresholds, 1.1ms minimum reset timeout, and integrated watchdog timer (35s startup / 1.12s normal mode). It asserts active-low open-drain RST when either supply drops below threshold and maintains reset for the timeout period-used in telecom power management and industrial embedded controllers requiring reliable brownout detection.

For engineers reviewing the MAX6719AUTTWD1+T datasheet, MAX6719AUTTWD1+T pinout, MAX6719AUTTWD1+T application, or MAX6719AUTTWD1+T equivalent, key selection criteria include its guaranteed reset validity down to VCC1/VCC2 = 0.8V, 14µA typical supply current at 3.6V, AEC-Q100 qualification, and support for externally adjustable third-voltage monitoring via RSTIN (626mV reference).

Technical Context

This device implements dual independent voltage comparators with hysteresis (0.5% of VTH), a programmable reset timeout timer (D1 suffix = 1.1ms min), and a dual-mode watchdog with long startup (35s min) and short operational timeout (1.12s min). Its internal 50kΩ MR pullup and 100nA RSTIN input leakage enable low-power external resistor-divider networks for auxiliary voltage monitoring.

The MAX6719AUTTWD1+T uses push-pull or open-drain output drivers referenced to VCC1 (RST/RST1) or VCC2 (RST2), with VOL ≤ 0.3V at ISINK = 1.2mA (VCC ≥ 2.7V) and VOH ≥ 0.8 × VCC1 at ISOURCE = 500µA. It operates across –40°C to +125°C and supports power-fail detection via PFI/PFO with 2µs propagation delay.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6720AUTTWD1+T and TPS3808G33DBVR, the MAX6719AUTTWD1+T uniquely combines dual-rail monitoring at 3.075V thresholds, 1.1ms timeout, integrated dual-mode watchdog, and RSTIN-based third-voltage capability - making it the only option for automotive and industrial designs requiring coordinated multi-rail supervision with software fault coverage.

Availability

MAX6719AUTTWD1+T is available at Aetrix Electronics and suitable for telecom infrastructure, automotive ADAS domain controllers, and industrial PLCs requiring stable component supply with AEC-Q100 assurance and extended temperature operation.

Supply support for MAX6719AUTTWD1+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 and mixed-signal ICs for demanding industrial, automotive, and communications applications.

The MAX6715A–MAX6729A/MAX6797A family delivers ultra-low-voltage supervisory circuits optimized for multivoltage systems where simultaneous monitoring of primary, secondary, and auxiliary rails is essential for system-level reliability.

FAQ

What is the reset timeout period for MAX6719AUTTWD1+T?

The MAX6719AUTTWD1+T has a D1 suffix indicating a minimum reset timeout period of 1.1ms. This value is guaranteed over the full –40°C to +125°C temperature range and ensures sufficient reset assertion time for microprocessors and FPGAs to complete power-on initialization sequences before releasing reset. The actual timeout may vary slightly due to process and temperature but remains within the specified min/max bounds.

Does MAX6719AUTTWD1+T support monitoring a third voltage rail?

Yes, the MAX6719AUTTWD1+T supports third-voltage monitoring via its RSTIN pin, which features an internal 626mV reference voltage and ≤100nA input leakage. By connecting an external resistor divider between the target rail and ground, users can set custom reset thresholds-for example, monitoring a 1.2V rail with R1 = 100kΩ and R2 = 52.3kΩ yields VEXT_TH ≈ 1.2V. This capability is confirmed in the device's Pin Description and Applications Information sections.

What is the watchdog behavior of MAX6719AUTTWD1+T?

The MAX6719AUTTWD1+T implements a dual-mode watchdog: after any reset event, it enters a 35s (min) startup mode to allow system boot, then transitions to a 1.12s (min) normal timeout mode. A rising or falling edge on WDI clears the timer; failure to toggle WDI within the active timeout period asserts RST for the full 1.1ms reset period. WDI is disabled when left floating, as confirmed by the Functional Diagram and Detailed Description sections.

Is MAX6719AUTTWD1+T qualified for automotive applications?

Yes, the MAX6719AUTTWD1+T is explicitly AEC-Q100 qualified (Grade 0, –40°C to +125°C), as stated in the Features section and Ordering Information. This qualification covers stress testing for temperature cycling, humidity, mechanical shock, and ESD-making it suitable for automotive powertrain, body electronics, and ADAS domain controllers where functional safety and long-term reliability are critical.

What are the absolute maximum ratings for VCC1 and VCC2 on MAX6719AUTTWD1+T?

The absolute maximum ratings specify VCC1 and VCC2 terminals withstand –0.3V to +6V with respect to GND. However, functional operation is guaranteed only between 0.8V and 5.5V per supply, as defined in the Electrical Characteristics table. Exceeding 5.5V risks permanent damage, and operation below 0.8V invalidates reset output logic state guarantees-both limits are documented in the Absolute Maximum Ratings and Operating Conditions sections.