Analog Devices Inc./Maxim Integrated MAX6719UTTGD6+T

Overview

MAX6719UTTGD6+T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in SOT23-6 package, monitoring VCC1 (1.575V threshold), VCC2 (0.788V threshold), and an externally adjustable RSTIN input (626.5mV reference). It asserts active-low open-drain reset for ≥560ms after any monitored supply falls below threshold or manual reset is triggered, and supports watchdog timeout (35s startup / 1.12s normal mode). It is used in multivoltage telecom power systems requiring reliable brownout detection and orderly shutdown.

For engineers reviewing the MAX6719UTTGD6+T datasheet, MAX6719UTTGD6+T pinout, MAX6719UTTGD6+T application, or MAX6719UTTGD6+T equivalent, key selection criteria include dual-supply monitoring with third adjustable rail support, guaranteed reset validity down to VCC1/VCC2 = 0.8V, open-drain RST output referenced to VCC1, and compatibility with battery-backed or low-noise industrial power architectures.

Technical Context

The MAX6719UTTGD6+T implements independent voltage comparators for primary (VCC1), secondary (VCC2), and auxiliary (RSTIN) rails, each with factory-trimmed thresholds and 20ppm/°C tempco. Its reset logic combines ORed fault conditions - undervoltage on any rail, MR assertion, or watchdog timeout - with a monolithic timeout timer that restarts on any new fault before expiry.

It features a high-impedance RSTIN input (±25nA leakage) enabling low-power external resistor-divider networks for custom threshold setting down to 0.62V, and integrates a dual-mode watchdog with long startup period (≥35s) and short normal period (≥1.12s), synchronized to WDI edge transitions rather than level duration alone.

Key Specifications

Pinout & Package

MAX6719UTTGD6+T is housed in a 6-pin SOT23-6 package with gull-wing leads, 0.95mm pitch, and 2.9mm × 1.6mm footprint. The package supports reflow soldering per JEDEC J-STD-020 and is rated for operation up to +85°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6719UTTGD6+T, MAX6720UTTGD6+T offers push-pull drive strength but sacrifices bus-sharing flexibility, while TPS3808G33DBVR reduces cost and size in dual-rail applications but eliminates the critical third-rail monitoring needed for complex SoC power domains.

Availability

MAX6719UTTGD6+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial control, and consumer electronics applications requiring stable component supply, long-term lifecycle assurance, and lead-free compliance.

Supply support for MAX6719UTTGD6+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 to replace discrete reset circuits in space-constrained multivoltage systems, delivering integrated triple-supply monitoring, watchdog, and manual reset in sub-3mm² SOT23 packages.

FAQ

What is the exact reset threshold voltage for VCC1 on the MAX6719UTTGD6+T?

The MAX6719UTTGD6+T has a factory-trimmed VCC1 reset threshold of 1.575V (typical), with a guaranteed range of 1.530V to 1.620V across temperature and process variation. This value is encoded in the "TG" suffix per Maxim's Reset Voltage Threshold Suffix Guide and applies specifically to the MAX6719UTTGD6+T variant.

Does the MAX6719UTTGD6+T support watchdog functionality?

No, the MAX6719UTTGD6+T does not include a watchdog input. According to Maxim's Selector Guide, only MAX6721 through MAX6729 variants integrate WDI functionality. The MAX6719UTTGD6+T provides triple-voltage supervision, manual reset, and open-drain RST output - but no watchdog timer.

What is the function of Pin 6 (RSTIN) on the MAX6719UTTGD6+T?

Pin 6 (RSTIN) on the MAX6719UTTGD6+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; when the divided voltage falls below this threshold, the RST output is asserted. If unused, RSTIN must be connected to VCC1 or VCC2.

What is the minimum reset timeout period for the MAX6719UTTGD6+T?

The MAX6719UTTGD6+T has a minimum reset timeout period of 560ms, indicated by the "D6" suffix in its part number. This value is guaranteed over the full -40°C to +85°C operating temperature range and ensures sufficient hold time for complex microprocessor initialization sequences.

Is the MAX6719UTTGD6+T pin-compatible with other devices in the MAX6715–MAX6729 family?

The MAX6719UTTGD6+T shares the same 6-pin SOT23-6 package and pinout as MAX6715, MAX6716, MAX6721, and MAX6722. However, functional differences exist: MAX6715/MAX6716 lack RSTIN, MAX6721/MAX6722 add watchdog, and MAX6716/MAX6722 use push-pull RST. Direct substitution requires verification of feature alignment beyond pin count.