Analog Devices Inc./Maxim Integrated MAX6719UTSVD3+T

Overview

MAX6719UTSVD3+T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in 6-pin SOT23 package, monitoring VCC1 (4.625V threshold), VCC2 (3.075V threshold), and an externally adjustable third supply via RSTIN (626.5mV reference). It asserts active-low open-drain reset for ≥210ms after any monitored voltage drops below threshold and guarantees valid reset output down to VCC1 or VCC2 = 0.8V. It supports manual reset, watchdog timer (35s startup / 1.12s normal), and operates from -40°C to +85°C.

For engineers reviewing the MAX6719UTSVD3+T datasheet, MAX6719UTSVD3+T pinout, MAX6719UTSVD3+T application, or MAX6719UTSVD3+T equivalent, key selection criteria include dual/third-supply monitoring capability, guaranteed reset validity at ultra-low VCC, 210ms minimum timeout, open-drain RST output referenced to VCC1, and compatibility with battery-powered or multivoltage embedded systems requiring robust brownout detection.

Technical Context

The MAX6719UTSVD3+T integrates three independent voltage monitors: factory-trimmed VCC1 and VCC2 comparators (4.625V and 3.075V nominal thresholds) plus a high-impedance RSTIN input with 626.5mV internal reference for external resistor-divider–based third-supply monitoring. Its reset logic combines OR-ed fault conditions (VCC1/VCC2/RSTIN undervoltage, MR assertion) with a monolithic timeout timer.

It features a dual-mode watchdog (35s min startup period after reset, 1.12s min normal timeout), manual reset with 50kΩ internal pullup to VCC1, and guaranteed reset assertion stability when either VCC1 or VCC2 remains ≥0.8V - enabling reliable operation during deep brownout conditions common in portable equipment.

Key Specifications

Pinout & Package

MAX6719UTSVD3+T is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained PCB layouts in portable and multivoltage systems.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6719UTSVD3+T, MAX6720UTSVD3+T offers push-pull drive but sacrifices bus-sharing flexibility, while TPS3808G33DBVR reduces feature set and monitoring scope - making MAX6719UTSVD3+T the optimal choice for designs needing verified triple-supply supervision with open-drain interoperability.

Availability

MAX6719UTSVD3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, telecom line cards, and set-top box power management requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6719UTSVD3+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 delivers ultra-low-voltage, multi-rail supervision in miniature SOT23 packages - designed specifically for space- and power-constrained embedded systems demanding reliable reset generation under brownout, startup, and fault conditions.

FAQ

What is the exact reset threshold voltage for VCC1 on the MAX6719UTSVD3+T?

The MAX6719UTSVD3+T has a factory-trimmed VCC1 reset threshold of 4.625V (typical), with guaranteed range 4.500V to 4.750V over temperature. This value is encoded in the "TS" suffix per Maxim's Reset Voltage Threshold Suffix Guide and applies to the falling edge of VCC1. The MAX6719UTSVD3+T uses this precise threshold to ensure reset assertion before critical 5V system components lose regulation.

Does the MAX6719UTSVD3+T support monitoring a third supply voltage, and how is it configured?

Yes, the MAX6719UTSVD3+T supports third-supply monitoring via its RSTIN pin, which features a 626.5mV internal reference voltage. To monitor a third supply (e.g., 1.2V or battery), connect an external resistor divider between that supply and GND, with the midpoint fed to RSTIN. The MAX6719UTSVD3+T asserts reset when the divided voltage falls below 626.5mV - enabling flexible, low-power supervision of auxiliary rails without additional ICs.

What is the reset timeout period for the MAX6719UTSVD3+T, and is it adjustable?

The MAX6719UTSVD3+T has a fixed minimum reset timeout period of 210ms, indicated by the "D3" suffix in its part number. This value is factory-programmed and not user-adjustable. The timeout begins when all monitored supplies (VCC1, VCC2, RSTIN) rise above their respective thresholds and ensures the microprocessor receives a sufficiently long reset pulse for reliable initialization - a critical timing parameter confirmed in the device's Electrical Characteristics table.

Is the reset output of the MAX6719UTSVD3+T open-drain or push-pull, and what are the implications?

The MAX6719UTSVD3+T features an active-low open-drain RST output, requiring an external pullup resistor to VCC1. This configuration enables wired-OR connection with other reset sources, compatibility with bidirectional µP reset pins, and level-shifting across different logic families. Unlike push-pull variants (e.g., MAX6720UTSVD3+T), the MAX6719UTSVD3+T's open-drain output avoids contention on shared reset buses - a key design advantage in complex multiboard systems.

How does the MAX6719UTSVD3+T guarantee valid reset operation when supply voltages drop below 1V?

The MAX6719UTSVD3+T guarantees valid reset assertion and deassertion down to VCC1 or VCC2 = 0.8V - verified across temperature and process corners. This is achieved through proprietary biasing and comparator design that maintains functional margins even during deep brownout. For applications requiring reset validity down to 0V, a 100kΩ pull-down resistor on RST is recommended, though this configuration is only viable for push-pull variants; the MAX6719UTSVD3+T's open-drain output requires careful external termination to preserve this low-VCC guarantee.