Analog Devices Inc./Maxim Integrated MAX6719UTSGD3+T

Overview

MAX6719UTSGD3+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 RSTIN input (626.5mV reference). It asserts active-low open-drain reset for ≥210ms after any monitored supply drops below threshold or manual reset is triggered, and supports watchdog timeout with 35s startup and 1.12s normal mode. It is used in multivoltage telecom power systems requiring reliable brownout detection and orderly shutdown.

For engineers reviewing the MAX6719UTSGD3+T datasheet, MAX6719UTSGD3+T pinout, MAX6719UTSGD3+T application, or MAX6719UTSGD3+T equivalent, key selection criteria include dual-supply monitoring with factory-trimmed thresholds, RSTIN-based third-voltage supervision down to 0.62V, guaranteed reset validity at VCC1/VCC2 ≥ 0.8V, low 14µA typical supply current, and compatibility with noisy industrial environments due to transient immunity.

Technical Context

The MAX6719UTSGD3+T implements a dual-threshold voltage monitor with independent VCC1 and VCC2 comparators, plus a high-impedance RSTIN input referenced to a 626.5mV internal bandgap. Its reset logic combines OR-ed fault conditions (VCC1 undervoltage, VCC2 undervoltage, RSTIN undervoltage, MR assertion) with a monolithic timeout timer ensuring minimum 210ms reset assertion.

It features an open-drain RST output referenced to VCC1, internal 50kΩ MR pullup, and a dual-mode watchdog timer: 35s min initial period post-reset for system boot, then 1.12s min normal timeout upon first WDI edge. No PFI/PFO or push-pull RST2 functionality is present-confirmed by Selector Guide and Pin Description tables.

Key Specifications

Pinout & Package

MAX6719UTSGD3+T is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), RoHS-compliant and lead-free (+T suffix). Pin 1 is marked with dot; pin numbering follows standard SOT23 counterclockwise layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6720UTSGD3+T and TPS3808G33DBVR, the MAX6719UTSGD3+T uniquely delivers open-drain RST for flexible bus interfacing and RSTIN-based third-rail monitoring-making it the only option among the three that supports both expandable voltage supervision and legacy reset bus topologies.

Availability

MAX6719UTSGD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and medical portable devices requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for MAX6719UTSGD3+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 deep expertise in supervisory and power-management solutions.

The MAX6715–MAX6729 family was engineered specifically for multivoltage embedded systems needing compact, low-power, triple-rail supervision with factory-trimmed accuracy and robust noise immunity-targeting telecom, industrial, and computing markets.

FAQ

What are the exact reset threshold voltages for MAX6719UTSGD3+T?

The MAX6719UTSGD3+T has factory-trimmed VCC1 reset threshold of 4.625V (falling) and VCC2 reset threshold of 3.075V (falling), per the "SG" suffix in the Reset Voltage Threshold Suffix Guide. Its RSTIN input uses a precise 626.5mV internal reference for third-voltage monitoring. These values are production-tested and specified across -40°C to +85°C.

Does MAX6719UTSGD3+T support watchdog functionality?

Yes, MAX6719UTSGD3+T includes a dual-mode watchdog timer: a 35s minimum startup period after reset to accommodate system boot, followed by a 1.12s minimum normal timeout period. The watchdog triggers reset if WDI remains static beyond these intervals. WDI pin is present and functional per the Selector Guide and Pin Description table.

Is the reset output of MAX6719UTSGD3+T open-drain or push-pull?

The MAX6719UTSGD3+T features an active-low open-drain RST output (Pin 1), confirmed by the Selector Guide (MAX6719 row shows "√" under "OPEN-DRAIN RESET") and Pin Description (RST function states "Open-Drain or Push-Pull" with MAX6719 assigned to open-drain variant). An external pullup resistor is required for proper logic-high level.

Can MAX6719UTSGD3+T monitor a third voltage below 1.0V?

Yes, MAX6719UTSGD3+T can monitor a third voltage as low as 0.62V using the RSTIN pin, which compares against a 626.5mV internal reference. By selecting appropriate resistor-divider ratios (e.g., R1/R2 = 5.78 for 3.6V rail → 0.626V), sub-1V rails-including battery voltage or LDO outputs-can be supervised with high accuracy and low bias current (±25nA).

What is the minimum supply voltage at which MAX6719UTSGD3+T guarantees valid reset output?

MAX6719UTSGD3+T guarantees correct reset output logic state when either VCC1 or VCC2 remains ≥ 0.8V, as explicitly stated in the General Description and Electrical Characteristics tables. This ensures fail-safe operation during deep brownout conditions where other supervisors may release reset prematurely.