Analog Devices Inc./Maxim Integrated MAX6719UTSFD3+T

Overview

MAX6719UTSFD3+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) for auxiliary supply monitoring down to 0.62V. It asserts active-low open-drain reset with 210ms minimum timeout, supports manual reset and watchdog timer, and guarantees valid reset operation down to VCC1 or VCC2 = 0.8V - used in multivoltage telecom power systems.

For engineers reviewing the MAX6719UTSFD3+T datasheet, MAX6719UTSFD3+T pinout, MAX6719UTSFD3+T application, or MAX6719UTSFD3+T equivalent, key selection factors include its dual-supply monitoring capability with factory-trimmed thresholds, RSTIN-adjustable third-voltage supervision, 210ms reset timeout, open-drain RST output referenced to VCC1, and guaranteed operation at ultralow supply voltages (0.8V).

Technical Context

The MAX6719UTSFD3+T implements independent voltage comparators for VCC1 and VCC2 with ±1.5% threshold accuracy and 20ppm/°C tempco, plus a high-impedance RSTIN input with 626.5mV internal reference and 3mV hysteresis. Its reset logic combines OR-ed fault detection across all three monitored rails and MR input, latched by a monostable timeout circuit.

It features a dual-mode watchdog timer: 35s minimum startup period after any reset event, transitioning to 1.12s minimum normal timeout after first WDI edge detection. The open-drain RST output requires external pullup and remains asserted for ≥210ms after all monitored supplies exceed their thresholds or MR returns high.

Key Specifications

Pinout & Package

MAX6719UTSFD3+T is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), surface-mount, lead-free (+T suffix), RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6720UTSFD3+T and TPS3808G33DBVR, the MAX6719UTSFD3+T uniquely provides open-drain RST for bidirectional µP compatibility and RSTIN-based third-rail supervision - critical for systems requiring full power-rail visibility and flexible reset signaling.

Availability

MAX6719UTSFD3+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 and long-term lifecycle support.

Supply support for MAX6719UTSFD3+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, automotive, and communications markets.

The MAX6715–MAX6729 family was designed specifically for space-constrained multivoltage systems requiring precise, low-power, triple-rail supervision with factory-trimmed thresholds and flexible reset architecture.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6719UTSFD3+T?

The MAX6719UTSFD3+T has factory-trimmed reset thresholds of 4.625V for VCC1 and 3.075V for VCC2, specified with ±1.5% tolerance over the full -40°C to +85°C operating range. These values are encoded in the "S" and "F" suffixes per Maxim's Reset Voltage Threshold Suffix Guide and are verified in the Electrical Characteristics table of the official datasheet. The MAX6719UTSFD3+T does not require external resistor networks to set these thresholds.

Does the MAX6719UTSFD3+T support watchdog functionality?

No, the MAX6719UTSFD3+T does not include a watchdog input (WDI). Per Maxim's Selector Guide, only MAX6721 through MAX6729 variants support watchdog functionality. The MAX6719UTSFD3+T is a triple-supply supervisor with manual reset (MR) and adjustable RSTIN input but no WDI pin or internal watchdog timer. This is confirmed by its pin configuration (no WDI terminal) and functional diagram.

What is the function of the RSTIN pin on the MAX6719UTSFD3+T and how is it used?

The RSTIN pin on the MAX6719UTSFD3+T is a high-impedance input for monitoring a third supply voltage using an external resistor divider. It compares the applied voltage against an internal 626.5mV reference; reset asserts when RSTIN falls below this threshold. Typical use includes monitoring battery voltage or auxiliary rails (e.g., 1.2V core). The MAX6719UTSFD3+T datasheet specifies ±25nA input current and 3mV hysteresis for noise immunity.

What package type and footprint does the MAX6719UTSFD3+T use?

The MAX6719UTSFD3+T uses a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm body size) with gull-wing leads, RoHS-compliant and lead-free ("+T" suffix). It is compatible with standard SOT23-6 PCB footprints and reflow soldering profiles. Pin 1 is marked by a dot or beveled edge; orientation matches JEDEC MO-178AB standard. No thermal pad or exposed die attach is present.

Can the MAX6719UTSFD3+T operate reliably when VCC1 drops below 1.0V?

Yes, the MAX6719UTSFD3+T guarantees valid reset output logic state down to VCC1 or VCC2 = 0.8V, as explicitly stated in the General Description and Absolute Maximum Ratings sections. Its internal comparators and reset latch remain functional at this level, ensuring correct assertion/deassertion behavior during brownout conditions. However, open-drain RST requires an external pullup resistor tied to a stable voltage source to maintain defined logic levels when VCC1 is near 0.8V.