Analog Devices Inc./Maxim Integrated MAX6719UTSYD3+T

Overview

MAX6719UTSYD3+T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in SOT23-6 package, monitoring VCC1 (4.625V threshold), VCC2 (3.075V threshold), and an externally adjustable RSTIN input (626mV reference). It asserts active-low open-drain reset for ≥210ms after any supply drop, supports manual reset and watchdog timer, and operates from -40°C to +85°C in multivoltage embedded systems.

For engineers reviewing the MAX6719UTSYD3+T datasheet, MAX6719UTSYD3+T pinout, MAX6719UTSYD3+T application, or MAX6719UTSYD3+T equivalent, key selection criteria include dual-supply monitoring with factory-trimmed thresholds, 210ms reset timeout, RSTIN-based third-voltage supervision down to 0.62V, and guaranteed reset validity with VCC1 or VCC2 ≥0.8V.

Technical Context

The MAX6719UTSYD3+T integrates three independent voltage monitors: primary (VCC1), secondary (VCC2), and auxiliary (RSTIN) with internal 626mV reference. Its reset logic combines ORed fault detection across all inputs and enforces a fixed 210ms minimum timeout after recovery.

It features an open-drain RST output referenced to VCC1, internal 50kΩ MR pullup, and no watchdog or power-fail functionality-confirmed by Selector Guide and Pin Description tables. The device uses BiCMOS process with 1072 transistors and guarantees correct reset state down to VCC = 0.8V.

Key Specifications

Pinout & Package

MAX6719UTSYD3+T is housed in a 6-pin SOT23-6 package with gull-wing leads, 1.27mm pitch, and JEDEC MO-178AC outline. Thermal resistance θ_JA = 115°C/W enables operation without heatsinking in standard PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6720UTSYD3+T, the MAX6719UTSYD3+T offers open-drain flexibility for shared reset buses; versus TPS3808G33DBVR, it provides essential third-rail monitoring without adding discrete components or increasing board area.

Availability

MAX6719UTSYD3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, network router power management, medical diagnostic handhelds, and automotive infotainment ECUs requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MAX6719UTSYD3+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 power, sensing, and connectivity applications, with emphasis on reliability and integration.

The MAX6715–MAX6729 family delivers compact, ultra-low-power supervisory circuits optimized for multivoltage embedded systems where space, power, and deterministic reset behavior are critical.

FAQ

What is the exact reset threshold voltage for VCC1 on the MAX6719UTSYD3+T?

The MAX6719UTSYD3+T has a factory-trimmed VCC1 reset threshold of 4.625V (falling), as indicated by the 'SY' suffix per the Reset Voltage Threshold Suffix Guide. This value is guaranteed over -40°C to +85°C with ±1.5% tolerance and 20ppm/°C tempco. The MAX6719UTSYD3+T uses this precise threshold to reliably detect brownout on 5V system rails without external calibration.

Does the MAX6719UTSYD3+T include a watchdog timer function?

No, the MAX6719UTSYD3+T does not include a watchdog timer. Per the Selector Guide and Pin Description tables, only MAX6721 through MAX6729 variants feature WDI functionality. The MAX6719UTSYD3+T is a triple-supply supervisor with RSTIN input, manual reset, and fixed 210ms timeout-but no watchdog input or associated timing circuitry.

What is the purpose of the RSTIN pin on the MAX6719UTSYD3+T?

The RSTIN pin on the MAX6719UTSYD3+T is a high-impedance input (±25nA) tied to an internal 626mV reference, enabling external adjustment of a third-voltage monitoring threshold using a resistor divider. It allows the MAX6719UTSYD3+T to supervise auxiliary supplies such as 1.2V cores or 1.8V memories. When RSTIN falls below 626mV, the device asserts RST-making the MAX6719UTSYD3+T uniquely capable of triple-rail supervision in a single SOT23-6 package.

How does the reset timeout period of 210ms affect system design with the MAX6719UTSYD3+T?

The 210ms minimum reset timeout on the MAX6719UTSYD3+T ensures the supervised microprocessor remains held in reset long enough for all power rails to stabilize and for internal regulators to complete startup-critical for complex SoCs and FPGAs. This fixed delay eliminates software dependency for reset timing and prevents premature release during slow-ramping DC/DC converters. Designers must ensure their processor's minimum reset pulse requirement is ≤210ms, as the MAX6719UTSYD3+T does not offer shorter timeout options in this variant.

Can the MAX6719UTSYD3+T operate with VCC1 and VCC2 supplied from different voltage sources?

Yes, the MAX6719UTSYD3+T is explicitly designed to monitor independent VCC1 and VCC2 supplies-for example, 5V from a main DC/DC converter and 3.3V from a separate LDO. The device powers itself from whichever supply is higher (VCC1 or VCC2), and each input drives its own dedicated comparator with factory-trimmed thresholds. This architecture allows robust supervision of heterogeneous power domains, and the MAX6719UTSYD3+T guarantees valid reset output as long as either VCC1 or VCC2 remains ≥0.8V.