Analog Devices Inc./Maxim Integrated MAX6719AUTVDD3+

Overview

MAX6719AUTVDD3+ 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 third supply via RSTIN (626.5mV reference). It asserts active-low open-drain reset for ≥210ms after any monitored voltage drops below threshold or manual reset is triggered, ensuring reliable power-up sequencing in multivoltage embedded systems.

For engineers reviewing the MAX6719AUTVDD3+ datasheet, MAX6719AUTVDD3+ pinout, MAX6719AUTVDD3+ application, or MAX6719AUTVDD3+ equivalent, key selection factors include its dual-supply monitoring with factory-trimmed thresholds, 210ms reset timeout, 14µA typical supply current at 3.6V, guaranteed reset validity down to VCC1/VCC2 = 0.8V, and integrated RSTIN input for auxiliary voltage supervision.

Technical Context

The MAX6719AUTVDD3+ implements independent voltage comparators for primary (VCC1) and secondary (VCC2) supplies, plus a high-impedance RSTIN input referenced to a 626.5mV internal bandgap. Its reset logic combines asynchronous assertion on any threshold violation with a monotonic timeout timer that restarts if voltage recovers before timeout completion.

This device uses BiCMOS process technology (1072 transistors) and features immunity to sub-20µs VCC transients, 20ppm/°C reset threshold tempco, and 0.5% hysteresis referenced to typical VTH. The open-drain RST output requires external pullup and remains valid even when VCC1 or VCC2 drops to 0.8V.

Key Specifications

Pinout & Package

MAX6719AUTVDD3+ is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained PCB layouts. Pin 1 is marked with a dot; pin numbering follows standard SOT23 convention (counterclockwise from mark).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisory applications.

Compared with MAX6719AUTVDD3+, MAX6720AUTVDD3+ simplifies layout by eliminating the pullup resistor but sacrifices bidirectional reset compatibility, while TPS3808G33DBVR reduces power consumption by 92% yet omits the critical third-supply monitoring required for complex multirail SoC platforms.

Availability

MAX6719AUTVDD3+ is available at Aetrix Electronics and suitable for industrial PLC power sequencing, telecom line card voltage monitoring, medical portable ultrasound battery management, and automotive infotainment power integrity requiring stable component supply and long-term lifecycle support.

Supply support for MAX6719AUTVDD3+ 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, computing, and communications markets.

The MAX6715–MAX6729 family was designed specifically for ultra-low-voltage multirail microprocessor supervision in space-constrained embedded systems, emphasizing factory-trimmed accuracy, low quiescent current, and robust reset timing under brownout conditions.

FAQ

What is the exact reset timeout period for MAX6719AUTVDD3+?

The MAX6719AUTVDD3+ has a minimum reset timeout period of 210ms, as indicated by the "D3" suffix in its part number. This value is guaranteed over the full -40°C to +85°C operating temperature range and ensures sufficient time for microprocessor initialization after power recovery. The actual timeout may vary slightly due to process and temperature, but remains within specification limits defined in the datasheet.

Does MAX6719AUTVDD3+ support monitoring a 1.2V core supply?

Yes, MAX6719AUTVDD3+ supports monitoring a 1.2V core supply using its RSTIN pin. By connecting a resistor divider between the 1.2V rail and ground, with the midpoint fed to RSTIN, the device compares the divided voltage against its internal 626.5mV reference. For example, a 1.2V rail would use R1 = 910kΩ and R2 = 1.0MΩ to set the trip point at 1.2V × (626.5mV / 1.2V) ≈ 626.5mV at the divider output.

Can MAX6719AUTVDD3+ operate with VCC1 = 2.5V and VCC2 = 1.8V?

Yes, MAX6719AUTVDD3+ is fully specified to operate with VCC1 as low as 1.8V and VCC2 as low as 0.9V. When VCC1 = 2.5V and VCC2 = 1.8V, the device maintains valid reset output logic down to VCC1 or VCC2 = 0.8V, and all electrical characteristics-including 14µA typical supply current and 210ms reset timeout-remain guaranteed per the datasheet.

Is MAX6719AUTVDD3+ RoHS-compliant and lead-free?

Yes, MAX6719AUTVDD3+ is RoHS-compliant and supplied in lead-free packaging, as indicated by the "+" suffix in its part number. Maxim Integrated certifies this variant meets JEDEC J-STD-020 moisture sensitivity level 1 requirements and is compatible with standard Pb-free reflow profiles up to 260°C peak temperature.

How does the manual reset (MR) input interact with the reset timeout timer in MAX6719AUTVDD3+?

In MAX6719AUTVDD3+, pulling MR low forces immediate reset assertion regardless of supply voltage levels. The reset remains active for the full 210ms timeout period after MR transitions high-even if VCC1/VCC2/RSTIN are already above their thresholds. This behavior ensures deterministic reset duration for test and debug scenarios, independent of power-rail status.