Analog Devices Inc./Maxim Integrated MAX6719UTRVD3

Overview

MAX6719UTRVD3 from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in a 6-pin SOT23 package, monitoring VCC1 (primary supply), VCC2 (secondary supply), and an externally adjustable third voltage via RSTIN. It asserts an active-low open-drain reset output when any monitored voltage falls below its threshold (VTH1 = 4.625 V, VTH2 = 3.075 V, VRSTIN = 626.5 mV), with a guaranteed 210 ms (min) reset timeout period and valid reset operation down to VCC1 or VCC2 = 0.8 V. It is used in multivoltage embedded systems requiring reliable power-up sequencing and brownout protection.

For engineers reviewing the MAX6719UTRVD3 datasheet, MAX6719UTRVD3 pinout, MAX6719UTRVD3 application, or MAX6719UTRVD3 equivalent, key selection criteria include dual factory-trimmed reset thresholds, externally adjustable third-voltage monitoring capability, open-drain RST output, manual reset input with internal 50 kΩ pullup, and immunity to short VCC transients - all critical for robust system-level power supervision in telecom, industrial, and portable equipment.

Technical Context

The MAX6719UTRVD3 integrates three independent voltage monitoring paths: primary (VCC1), secondary (VCC2), and auxiliary (RSTIN), each with dedicated comparators referenced to precision internal references (1.575 V for VTH1, 3.075 V for VTH2, 626.5 mV for RSTIN). Its reset logic combines OR-ed fault detection across all inputs and enforces a minimum 210 ms (min) timeout after recovery before deasserting RST.

It features a manual reset input (MR) with glitch rejection (100 ns), 200 ns MR-to-reset delay, and internal 50 kΩ pullup to VCC1; no watchdog or power-fail functions are included - confirmed by Selector Guide and Pin Description tables showing MAX6719 as "√" for manual reset only, with no WDI or PFI/PFO pins enabled.

Key Specifications

Pinout & Package

Package: 6-pin SOT23-6, surface-mount, lead-free compatible (RoHS-compliant), footprint per JEDEC MO-178AB.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6720UTRVD3 and TPS3808G33DBVR, the MAX6719UTRVD3 uniquely delivers open-drain RST for flexible bus interfacing plus factory-trimmed dual thresholds and RSTIN-based third-voltage monitoring - making it the only option among the three that fully satisfies triple-rail, multi-topology supervision requirements without external components.

Availability

MAX6719UTRVD3 is available at Aetrix Electronics and suitable for telecom line cards, industrial PLCs, portable medical monitors, and set-top boxes 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.

The MAX6715–MAX6729 family was designed specifically for compact, multivoltage embedded systems needing reliable, low-power, factory-configurable power supervision - with emphasis on minimizing external components and guaranteeing operation across wide temperature and supply ranges.

FAQ

What is the exact reset timeout period for MAX6719UTRVD3?

The MAX6719UTRVD3 has a guaranteed minimum reset timeout period of 210 ms, with typical value 210 ms and maximum 280 ms, as defined by the "D3" suffix in its part number per the Reset Timeout Period Suffix Guide. This timeout begins after all monitored voltages (VCC1, VCC2, RSTIN) rise above their respective thresholds and ensures the microprocessor remains held in reset long enough for complete initialization.

Does MAX6719UTRVD3 include a watchdog timer function?

No, the MAX6719UTRVD3 does not include a watchdog timer. According to the Selector Guide and Pin Description tables, MAX6719 is explicitly marked without WDI (watchdog input) functionality. Only MAX6721 through MAX6729 variants support watchdog features; MAX6719UTRVD3 provides only voltage monitoring, manual reset, and open-drain reset output.

What are the factory-trimmed reset thresholds for MAX6719UTRVD3?

The MAX6719UTRVD3 has factory-trimmed reset thresholds of 4.625 V for VCC1 (primary supply) and 3.075 V for VCC2 (secondary supply), corresponding to the "LT" suffix in its full ordering code (MAX6719UTLTD3-T). These values are specified in the Electrical Characteristics table under VTH1 and VTH2 columns with "T" and "S" falling-edge codes respectively.

Can MAX6719UTRVD3 monitor a 1.2 V core supply?

Yes, the MAX6719UTRVD3 can monitor a 1.2 V core supply using its RSTIN pin. With an internal reference of 626.5 mV, a simple resistor divider (e.g., R1 = 110 kΩ, R2 = 130 kΩ) scales the 1.2 V rail to ~626 mV at RSTIN, triggering reset when the core voltage drops below ~1.18 V. The high-impedance RSTIN input (±25 nA) ensures minimal loading on the monitored rail.

Is MAX6719UTRVD3 pin-compatible with other devices in the MAX6715–MAX6729 family?

Yes, the MAX6719UTRVD3 is pin-compatible with all 6-pin SOT23-6 variants in the MAX6715–MAX6729 family (e.g., MAX6715UTxxx, MAX6716UTxxx, MAX6720UTxxx), sharing identical pinout: Pin 1 = RST, Pin 2 = GND, Pin 3 = MR, Pin 4 = VCC2, Pin 5 = RSTIN, Pin 6 = VCC1. However, functional differences (e.g., push-pull vs. open-drain RST, presence of WDI/PFI) mean electrical compatibility requires verification against the specific variant's Selector Guide entry.