Analog Devices Inc./Maxim Integrated MAX6719UTSDD3-T

Overview

MAX6719UTSDD3-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 (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 guarantees valid reset output down to VCC1 or VCC2 = 0.8V. It supports battery-operated telecom and industrial systems requiring reliable power sequencing and brownout detection.

For engineers reviewing the MAX6719UTSDD3-T datasheet, MAX6719UTSDD3-T pinout, MAX6719UTSDD3-T application, or MAX6719UTSDD3-T equivalent, key selection criteria include its dual-supply monitoring capability with factory-trimmed thresholds, 210ms minimum reset timeout, 14µA typical supply current at 3.6V, and integrated RSTIN comparator for third-voltage supervision down to 0.62V.

Technical Context

The MAX6719UTSDD3-T implements independent voltage comparators for VCC1 and VCC2 with ±1.5% threshold accuracy and 20ppm/°C tempco, plus a high-impedance RSTIN input referenced to a 626.5mV internal bandgap. Its reset logic combines OR-ed fault conditions (VCC1/VCC2 undervoltage, RSTIN low, MR low) with a monolithic timeout timer ensuring ≥210ms reset assertion after recovery.

This device uses BiCMOS process technology (1072 transistors) and features glitch-immune reset generation-immune to VCC transients <20µs when overdriven by ≥100mV-and includes internal 50kΩ MR pullup, enabling direct pushbutton interface without external components.

Key Specifications

Pinout & Package

MAX6719UTSDD3-T is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), surface-mount, lead-free compliant. Pin 1 is marked with dot; pin numbering follows standard SOT23 convention (counterclockwise from mark).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6719UTSDD3-T, MAX6720UTSDD3-T offers push-pull drive for simplified interfacing but loses open-drain flexibility, while TPS3808G33DBVR reduces current consumption by 90% but sacrifices triple-supply capability and design adaptability.

Availability

MAX6719UTSDD3-T is available at Aetrix Electronics and suitable for telecom power sequencing, industrial PLC I/O modules, portable medical monitors, and battery-powered IoT gateways requiring stable component supply, long-term lifecycle support, and guaranteed factory-trimmed voltage thresholds.

Supply support for MAX6719UTSDD3-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 precision analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.

The MAX6715–MAX6729 family was designed specifically for multivoltage embedded systems needing compact, low-power, factory-calibrated supervision of primary, secondary, and auxiliary rails-targeting space-constrained and battery-sensitive applications.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6719UTSDD3-T?

The MAX6719UTSDD3-T has factory-trimmed reset thresholds of 4.625V for VCC1 (falling edge) and 3.075V for VCC2 (falling edge), as defined by the "TD" suffix in the part number per Maxim's Reset Voltage Threshold Suffix Guide. These values are guaranteed over -40°C to +85°C with ±1.5% initial accuracy and 20ppm/°C tempco. The MAX6719UTSDD3-T datasheet specifies these as minimum/typical/maximum bounds in the Electrical Characteristics table.

Does the MAX6719UTSDD3-T support monitoring a third voltage, and how is it configured?

Yes, the MAX6719UTSDD3-T supports third-voltage monitoring via its RSTIN pin, which references an internal 626.5mV bandgap. To monitor an external supply (e.g., 1.2V), connect a resistor divider between that supply and GND, with the midpoint fed to RSTIN. The threshold is set by VEXT_TH = 626.5mV × (R1 + R2)/R2. The MAX6719UTSDD3-T guarantees RSTIN input current ≤±25nA, enabling high-impedance, low-power divider networks.

What is the reset timeout period for the MAX6719UTSDD3-T, and is it adjustable?

The MAX6719UTSDD3-T has a fixed minimum reset timeout period of 210ms, indicated by the "D3" suffix in its part number per Maxim's Reset Timeout Period Suffix Guide. This value is not user-adjustable-it is implemented with a monolithic RC timer trimmed at wafer test. The MAX6719UTSDD3-T datasheet confirms tRP = 210ms (min), 315ms (typ), 420ms (max) across temperature and voltage, ensuring robust immunity to transient faults.

Is the reset output of the MAX6719UTSDD3-T open-drain or push-pull, and what are the drive requirements?

The MAX6719UTSDD3-T features an active-low open-drain RST output (Pin 1), requiring an external pullup resistor to the host system's reset rail voltage (e.g., 3.3V or 5V). Its VOL is ≤0.4V at 3.2mA sink, and leakage is ≤0.5µA when deasserted. This configuration allows level-shifting and wired-OR reset bus sharing-unlike push-pull variants such as MAX6720UTSDD3-T, which do not require external biasing.

How does the MAX6719UTSDD3-T ensure reliable reset operation during low VCC conditions?

The MAX6719UTSDD3-T guarantees valid reset output logic state down to VCC1 or VCC2 = 0.8V, verified across temperature and process corners. Its internal comparators and reset driver remain functional at this level, unlike many supervisors that fail below 1.0V. For operation down to 0V, Maxim recommends a 100kΩ pull-down on RST-but this applies only to push-pull versions; the MAX6719UTSDD3-T's open-drain output requires external pullup, not pull-down.