Analog Devices Inc./Maxim Integrated MAX6719UTWGD3+T

Overview

The MAX6719UTWGD3+T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in a 6-pin SOT23 package, monitoring VCC1 (4.625V threshold), VCC2 (3.075V threshold), and an externally adjustable RSTIN input (626.5mV reference). It asserts an active-low open-drain reset output with 210ms minimum timeout, supports manual reset and watchdog timer functions, and operates from -40°C to +85°C for reliable power sequencing in multivoltage embedded systems.

For engineers reviewing the MAX6719UTWGD3+T datasheet, MAX6719UTWGD3+T pinout, MAX6719UTWGD3+T application, or MAX6719UTWGD3+T equivalent, key selection criteria include its dual-supply monitoring capability (1.8V–5.0V primary, 0.9V–3.3V secondary), 626.5mV adjustable RSTIN threshold, 210ms reset timeout, 14µA typical supply current at 3.6V, and guaranteed reset validity down to VCC1 or VCC2 = 0.8V.

Technical Context

The MAX6719UTWGD3+T implements independent voltage comparators for VCC1 and VCC2 with factory-trimmed thresholds (4.625V and 3.075V respectively), plus a high-impedance RSTIN input referenced to a 626.5mV internal bandgap. Its reset logic combines OR-ed fault detection across all three monitored rails and includes a 210ms minimum timeout counter that restarts on any new fault event before completion.

This device integrates a dual-mode watchdog timer (35s startup, 1.12s normal mode), manual reset input with 50kΩ internal pullup, and guarantees correct reset output state even when either VCC1 or VCC2 drops to 0.8V - enabling robust brownout detection in low-voltage battery-powered applications without external support circuitry.

Key Specifications

Pinout & Package

MAX6719UTWGD3+T is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm) with gull-wing leads, optimized for space-constrained PCB layouts and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6720UTWGD3+T and TPS3808G33DBVR, the MAX6719UTWGD3+T uniquely provides open-drain reset compatibility with legacy µPs, full triple-supply supervision including adjustable RSTIN, and industrial temperature operation - making it the only option for designs requiring all three features simultaneously.

Availability

MAX6719UTWGD3+T is available at Aetrix Electronics and suitable for telecom power sequencing, industrial PLC I/O modules, portable medical devices, and battery-powered IoT sensors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6719UTWGD3+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 management, sensing, and connectivity in demanding industrial, automotive, and communications applications.

The MAX6715–MAX6729 product line delivers ultra-low-voltage supervisory circuits optimized for multirail embedded systems requiring simultaneous monitoring of primary, secondary, and auxiliary power domains with minimal footprint and current consumption.

FAQ

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

The MAX6719UTWGD3+T has a factory-trimmed VCC1 reset threshold of 4.625V (minimum 4.500V, maximum 4.750V) specified at falling edge. This value is encoded in the "WG" suffix per Maxim's Reset Voltage Threshold Suffix Guide and applies across the full -40°C to +85°C operating temperature range with ±20ppm/°C tempco.

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

Yes, the MAX6719UTWGD3+T supports third-rail monitoring via its RSTIN pin, which references an internal 626.5mV bandgap. To monitor an external voltage (e.g., 1.2V), connect a resistor divider between the rail and GND with RSTIN at the midpoint. The threshold is calculated as V_{EXT_TH} = 626.5mV × ((R1 + R2)/R2), enabling precise undervoltage detection down to 0.62V.

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

The MAX6719UTWGD3+T has a fixed minimum reset timeout period of 210ms, indicated by the "D3" suffix in its part number. This value is factory-programmed and not user-adjustable. The timeout begins when all monitored supplies rise above their thresholds and ensures the microprocessor remains held in reset long enough for stable clock and memory initialization.

How does the manual reset (MR) input function on the MAX6719UTWGD3+T?

The MR input on the MAX6719UTWGD3+T is an active-low signal with an internal 50kΩ pullup to VCC1. Pulling MR low for ≥1µs forces an immediate reset assertion, which persists for the full 210ms timeout after MR returns high. If unused, MR may be left floating or tied to VCC1; no external components are required for basic operation.

Is the MAX6719UTWGD3+T compatible with both 3.3V and 5V microprocessor reset inputs?

Yes, the MAX6719UTWGD3+T's open-drain RST output is compatible with both 3.3V and 5V µP reset inputs when used with an appropriate external pullup resistor (typically 4.7kΩ to VCC of the target µP). Its guaranteed reset validity down to VCC1 or VCC2 = 0.8V ensures correct logic levels across wide supply voltage ranges without level-shifting circuitry.