Analog Devices Inc./Maxim Integrated MAX6719UTWGD3+

Overview

MAX6719UTWGD3+ from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in 6-pin SOT23 package, monitoring VCC1 (1.575V threshold), VCC2 (3.075V threshold), and an externally adjustable RSTIN input (626.5mV reference) for auxiliary supply monitoring down to 0.62V. It asserts active-low open-drain reset with 210ms minimum timeout and guarantees valid reset output down to VCC1 or VCC2 = 0.8V. Used in multivoltage embedded systems requiring reliable power sequencing and brownout protection.

For engineers reviewing the MAX6719UTWGD3+ datasheet, MAX6719UTWGD3+ pinout, MAX6719UTWGD3+ application, or MAX6719UTWGD3+ equivalent, key selection criteria include its triple-supply monitoring capability, factory-trimmed dual thresholds with external RSTIN flexibility, guaranteed reset validity at ultra-low supply voltage (0.8V), 210ms reset timeout, and open-drain RST output compatible with bidirectional µP reset pins.

Technical Context

The MAX6719UTWGD3+ integrates three independent voltage monitors: primary (VCC1), secondary (VCC2), and auxiliary (RSTIN), each with dedicated comparators and hysteresis. Its reset logic combines ORed fault conditions - VCC1/VCC2 undervoltage, RSTIN undervoltage, or manual reset assertion - triggering a single open-drain RST output held low for a fixed 210ms timeout after all monitored voltages recover.

It features a high-impedance RSTIN input (±25nA leakage) referenced to a precision 626.5mV internal bandgap, enabling third-supply monitoring via external resistor divider. The device operates across -40°C to +85°C and draws only 14µA typical supply current at 3.6V, with guaranteed reset assertion even when VCC1 or VCC2 drops to 0.8V.

Key Specifications

Pinout & Package

MAX6719UTWGD3+ is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), surface-mount, RoHS-compliant, lead-free (+T suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6720UTWGD3+, the MAX6719UTWGD3+ provides open-drain flexibility for legacy µP interfaces, while versus TPS3808G33DBVR it delivers essential third-rail supervision and shorter, more responsive 210ms reset timing - critical for modern multivoltage SoC platforms.

Availability

MAX6719UTWGD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, portable medical devices, and set-top box designs requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for MAX6719UTWGD3+ 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 was designed specifically for space-constrained, multivoltage embedded systems needing reliable, low-power, triple-supply supervision with minimal external components.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6719UTWGD3+?

The MAX6719UTWGD3+ has factory-trimmed reset thresholds of 4.375V (typical, ±1.5%) for VCC1 and 3.075V (typical, ±1.5%) for VCC2, as defined by the "WG" suffix per Maxim's Reset Voltage Threshold Suffix Guide. These values are guaranteed over -40°C to +85°C and require no external calibration.

Does the MAX6719UTWGD3+ support monitoring a third supply voltage, and how is it configured?

Yes, the MAX6719UTWGD3+ supports third-supply monitoring via its RSTIN pin, which compares the applied voltage against a precise 626.5mV internal reference. To monitor a higher voltage (e.g., 5V), use a resistor divider (e.g., R1 = 7.87kΩ, R2 = 1.0kΩ) to scale the input so RSTIN sees ≤626.5mV at the desired trip point.

What is the reset timeout period for the MAX6719UTWGD3+, and is it adjustable?

The MAX6719UTWGD3+ has a fixed minimum reset timeout period of 210ms, indicated by the "D3" suffix in its part number. This timeout is factory-programmed and not user-adjustable; it ensures sufficient hold time for microprocessor initialization after power recovery.

Is the reset output of the MAX6719UTWGD3+ open-drain or push-pull, and what are the implications?

The MAX6719UTWGD3+ features an open-drain active-low RST output (per Selector Guide and Pin Description). This allows direct interfacing with bidirectional µP reset pins and supports flexible pull-up voltage selection (e.g., to 1.8V, 3.3V, or 5V), unlike push-pull variants such as MAX6720UTWGD3+.

How does the MAX6719UTWGD3+ ensure valid reset operation when supply voltage drops near zero?

The MAX6719UTWGD3+ guarantees correct reset output logic state down to VCC1 or VCC2 = 0.8V. For operation below 0.8V, a 100kΩ pull-down resistor from RST to GND ensures low-state validity during deep brownout - though this configuration is only valid for open-drain outputs like those on the MAX6719UTWGD3+.