Analog Devices Inc./Maxim Integrated MAX6719AUTVDD3+T

Overview

MAX6719AUTVDD3+T from Maxim Integrated is a dual-supply ultra-low-voltage microprocessor supervisory circuit in SOT23-6 package, monitoring VCC1 (primary) and VCC2 (secondary) with factory-trimmed reset thresholds of 4.625V (VTH1) and 3.075V (VTH2), 1.1ms minimum reset timeout, and guaranteed reset validity down to VCC1 or VCC2 = 0.8V. It supports portable/battery-operated equipment requiring reliable power-up sequencing and brownout detection.

For engineers reviewing the MAX6719AUTVDD3+T datasheet, MAX6719AUTVDD3+T pinout, MAX6719AUTVDD3+T application, or MAX6719AUTVDD3+T equivalent, key selection criteria include dual-voltage monitoring capability, 14µA typical supply current at 3.6V, open-drain RST output referenced to VCC1, manual-reset input with internal 50kΩ pullup, and operation across –40°C to +125°C.

Technical Context

The MAX6719AUTVDD3+T integrates two independent voltage comparators with precision internal references (VTH1 = 4.625V ±125mV, VTH2 = 3.075V ±75mV), hysteresis of 0.5% of threshold, and temperature coefficient of 20ppm/°C. Its reset logic asserts active-low RST when either supply falls below its threshold and holds for a fixed 1.1ms (min) timeout after recovery.

This variant includes MR (manual-reset) and RSTIN (adjustable third-voltage monitor) inputs but excludes watchdog (WDI) and power-fail (PFI/PFO) functions. Pin configuration follows the MAX6719A series SOT23-6 layout with VCC1, VCC2, GND, MR, RST, and RSTIN terminals - no RST2, PFO, or WDI connections present.

Key Specifications

Pinout & Package

MAX6719AUTVDD3+T is housed in a RoHS-compliant 6-pin SOT23 package (package code U6+1, outline 21-0058), with thermal resistance θJA = 115°C/W on multilayer board.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-supply supervisory applications.

Compared with MAX6718AUTVD3+T, MAX6719AUTVDD3+T offers open-drain flexibility for multi-device reset coordination; versus TPS3808G33DBVR, it delivers essential dual-voltage supervision and adjustable third-rail monitoring required in modern multirail embedded designs.

Availability

MAX6719AUTVDD3+T is available at Aetrix Electronics and suitable for portable/battery-operated equipment, industrial control systems, computers/servers, and telecom/networking equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6719AUTVDD3+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 high-performance analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.

The MAX6715A–MAX6729A family delivers ultra-low-voltage, dual/triple-supply supervisory circuits optimized for space-constrained, battery-sensitive, and thermally aggressive embedded systems requiring guaranteed reset behavior down to 0.8V.

FAQ

What is the exact reset threshold voltage for VCC1 on the MAX6719AUTVDD3+T?

The MAX6719AUTVDD3+T has a factory-trimmed VCC1 reset threshold of 4.625V (typical), with guaranteed limits of 4.500V (min) and 4.750V (max) at 25°C. This value is fixed per the "D" suffix in the ordering code and applies across the full –40°C to +125°C operating range with 20ppm/°C tempco.

Does the MAX6719AUTVDD3+T support monitoring a third voltage rail?

Yes, the MAX6719AUTVDD3+T includes the RSTIN pin, a high-impedance input with a precise 626.5mV internal reference. By connecting an external resistor divider from a third voltage rail to RSTIN and GND, users can configure custom reset thresholds - for example, monitoring a 1.2V core supply with ~1.95:1 divider ratio.

Is the reset output of the MAX6719AUTVDD3+T push-pull or open-drain?

The MAX6719AUTVDD3+T features an open-drain RST output referenced to VCC1. This requires an external pullup resistor to the appropriate logic rail and enables wired-OR connection with other reset sources - a key advantage over push-pull variants like MAX6718AUTVD3+T in multi-IC systems.

What is the minimum reset timeout period for the MAX6719AUTVDD3+T?

The MAX6719AUTVDD3+T has a minimum reset timeout period of 1.1ms, as indicated by the "D1" suffix in its ordering code. This fixed delay begins when VCC1 or VCC2 recovers above their respective thresholds and ensures sufficient hold time for microprocessor initialization before release.

Can the MAX6719AUTVDD3+T operate with VCC1 below 1.0V?

Yes - the MAX6719AUTVDD3+T guarantees correct reset output logic state as long as either VCC1 or VCC2 remains above 0.8V. This feature enables reliable brownout detection in ultra-low-power systems where supply rails may dip close to device operational limits without causing undefined behavior.