Analog Devices Inc./Maxim Integrated MAX6719UTRVD3+

Overview

MAX6719UTRVD3+ from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in 6-pin SOT23 package, monitoring VCC1 (4.625V threshold), VCC2 (3.075V threshold), and an externally adjustable third supply via RSTIN (626mV reference). It asserts active-low open-drain reset for ≥210ms after any monitored voltage falls below threshold, with manual reset input and guaranteed reset validity down to VCC1 or VCC2 = 0.8V. Used in multivoltage telecom and portable equipment for reliable power-up sequencing and brownout protection.

For engineers reviewing the MAX6719UTRVD3+ datasheet, MAX6719UTRVD3+ pinout, MAX6719UTRVD3+ application, or MAX6719UTRVD3+ equivalent, key selection criteria include its dual-supply monitoring capability (1.8–5.0V primary, 0.9–3.3V secondary), 210ms min reset timeout, 14µA typical supply current at 3.6V, and support for adjustable third-voltage monitoring down to 0.62V.

Technical Context

The MAX6719UTRVD3+ integrates three independent voltage monitors: factory-trimmed VCC1 and VCC2 comparators plus an external RSTIN comparator referenced to a 626mV internal bandgap. Its reset logic combines ORed fault detection across all three inputs and enforces a fixed 210ms minimum timeout after recovery, independent of supply ramp rates.

It features an open-drain RST output referenced to VCC1, internal 50kΩ MR pullup, and immunity to VCC transients ≤20µs when overdrive exceeds 100mV - enabling robust operation in noisy DC/DC converter environments without external filtering.

Key Specifications

Pinout & Package

MAX6719UTRVD3+ uses a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm height) with gull-wing leads, RoHS-compliant lead-free finish (+T suffix), and thermal pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6720UTRVD3+, the MAX6719UTRVD3+ provides open-drain flexibility for shared reset buses, while TPS3808G33DBVR trades monitoring breadth for sub-2µA quiescent current - making MAX6719UTRVD3+ optimal for multirail integrity where reset coordination matters more than nanoamp savings.

Availability

MAX6719UTRVD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and portable medical devices requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for MAX6719UTRVD3+ 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, sensing, and interface applications, with emphasis on high-reliability industrial and communications markets.

The MAX6715–MAX6729 family delivers compact, low-power supervisory solutions for multivoltage embedded systems, specifically engineered to replace discrete reset circuits in space-constrained telecom, computing, and portable equipment.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6719UTRVD3+?

The MAX6719UTRVD3+ has factory-trimmed reset thresholds of 4.625V for VCC1 and 3.075V for VCC2, each with ±1.5% maximum tolerance over temperature. These values are encoded in the "R" and "T" suffixes per Maxim's Reset Voltage Threshold Suffix Guide and are verified across the full -40°C to +85°C operating range. The MAX6719UTRVD3+ does not support user adjustment of these primary thresholds.

Does the MAX6719UTRVD3+ support monitoring a third voltage, and how is it configured?

Yes, the MAX6719UTRVD3+ supports third-voltage monitoring via the RSTIN pin, which compares the applied voltage against a precise 626mV internal reference. To monitor a target voltage (e.g., 1.8V), connect a resistor divider between that rail and GND, with the midpoint fed to RSTIN. The MAX6719UTRVD3+ datasheet provides the formula V_{EXT_TH} = 626mV × ((R1 + R2)/R2) for calculating divider values.

What is the function of the MR pin on the MAX6719UTRVD3+, and what are its electrical characteristics?

The MR (Manual Reset) pin on the MAX6719UTRVD3+ is an active-low input with an internal 50kΩ pullup to VCC1. Pulling MR below 0.3×VCC1 asserts reset for the full timeout period (210ms min), even if supplies remain valid. The MAX6719UTRVD3+ specifies a 1µs minimum pulse width and 200ns MR-to-reset delay, making it compatible with pushbutton switches and logic-driven reset initiation without external debouncing.

Is the reset output of the MAX6719UTRVD3+ open-drain or push-pull, and what are the drive requirements?

The MAX6719UTRVD3+ features an open-drain RST output, requiring an external pullup resistor to VCC1 or another logic rail. It sinks up to 3.2mA at VCC1 ≥ 4.5V while maintaining VOL ≤ 0.4V, and exhibits <0.5µA leakage when deasserted. This configuration allows wired-OR reset bus sharing and compatibility with bidirectional µP reset pins - a key distinction from the push-pull MAX6720UTRVD3+ variant.

What is the guaranteed operating temperature range and supply voltage range for the MAX6719UTRVD3+?

The MAX6719UTRVD3+ is specified for continuous operation from -40°C to +85°C ambient temperature. Its supply voltage range is VCC1 = 0.8V to 5.5V and VCC2 = 0.8V to 5.5V, with functional reset assertion guaranteed as long as either VCC1 or VCC2 remains ≥ 0.8V. This extended low-voltage operation ensures reliable brownout detection in systems with rapidly collapsing rails.