Analog Devices Inc./Maxim Integrated MAX6719UTVHD3

Overview

MAX6719UTVHD3 from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in 6-pin SOT23 package, monitoring VCC1 (primary), VCC2 (secondary), and RSTIN (adjustable third supply) with factory-trimmed thresholds of 4.625V and 3.075V, 210ms minimum reset timeout, and guaranteed reset validity down to VCC1 or VCC2 = 0.8V - used in multivoltage telecom power systems for reliable brownout detection and system initialization.

For engineers reviewing the MAX6719UTVHD3 datasheet, MAX6719UTVHD3 pinout, MAX6719UTVHD3 application, or MAX6719UTVHD3 equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% over temperature), ultra-low 14µA typical supply current at 3.6V, RSTIN adjustable monitoring down to 0.626V, push-pull reset output referenced to VCC1, and immunity to sub-20µs VCC transients.

Technical Context

The MAX6719UTVHD3 integrates three independent voltage comparators: one for VCC1 (4.625V nominal threshold), one for VCC2 (3.075V nominal), and one for RSTIN with internal 626.5mV reference enabling external resistor-divider-based monitoring of auxiliary supplies as low as 0.62V. Its reset logic asserts active-low RST when any monitored input falls below its threshold and holds for a guaranteed minimum 210ms after all inputs recover.

This device features a manual reset input (MR) with 50kΩ internal pullup to VCC1, supports noise-immune MR pulse widths ≥1µs, and includes glitch rejection (100ns). It lacks watchdog or power-fail functionality - confirmed by Selector Guide: MAX6719 has "√" under Manual Reset and "-" under Watchdog Input and Power-Fail I/O.

Key Specifications

Pinout & Package

MAX6719UTVHD3 is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), RoHS-compliant and available in lead-free (+T) variant. Pin functions are validated per Maxim's official Pin Description table for MAX6719/MAX6720.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6720UTVHD3 and TPS3808G33DBVR, the MAX6719UTVHD3 uniquely delivers push-pull reset drive, factory-trimmed dual thresholds, and RSTIN-based third-supply monitoring in one 6-pin SOT23 - making it optimal for space-constrained multivoltage systems requiring minimal external components and deterministic reset timing.

Availability

MAX6719UTVHD3 is available at Aetrix Electronics and suitable for telecom power sequencing, industrial PLC I/O modules, network router control planes, and battery-powered edge gateways requiring stable component supply across extended temperature ranges.

Supply support for MAX6719UTVHD3 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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.

The MAX6715–MAX6729 family was engineered specifically for compact, ultra-low-power multivoltage supervision in space-constrained embedded systems - emphasizing threshold accuracy, sub-20µA quiescent current, and guaranteed operation down to 0.8V supply.

FAQ

What is the exact reset timeout period of the MAX6719UTVHD3?

The MAX6719UTVHD3 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 is not affected by supply voltage variations between 0.8V and 5.5V. The actual timeout may extend up to 280ms at maximum conditions, but system design should rely on the 210ms minimum for timing-critical boot sequences. This timeout applies uniformly whether triggered by VCC1, VCC2, RSTIN, or MR.

Does the MAX6719UTVHD3 support watchdog timer functionality?

No, the MAX6719UTVHD3 does not include a watchdog timer. Per Maxim's official Selector Guide, MAX6719 is explicitly marked with "-" under the Watchdog Input column, confirming absence of WDI pin and internal watchdog circuitry. The device relies solely on voltage monitoring and manual reset for fault detection. For watchdog capability in the same family, consider MAX6721–MAX6729 variants - but those require different pinouts and part numbers. The MAX6719UTVHD3 remains dedicated to pure voltage supervision.

What are the valid voltage ranges for VCC1 and VCC2 on the MAX6719UTVHD3?

VCC1 accepts 1.8V to 5.0V for primary supply monitoring, while VCC2 accepts 0.9V to 3.3V for secondary supply monitoring. Both rails must remain ≥0.8V for guaranteed reset logic validity. The device draws supply current from whichever rail is higher (VCC1 or VCC2), and internal comparators operate correctly across these full ranges. Thresholds are factory-trimmed to 4.625V (VCC1) and 3.075V (VCC2), with ±1.5% tolerance over temperature - matching standard 5V and 3.3V system tolerances.

Can the MAX6719UTVHD3 monitor a 1.2V supply using the RSTIN pin?

Yes, the MAX6719UTVHD3 can monitor a 1.2V supply via RSTIN using an external resistor divider. With its internal 626.5mV reference, a simple two-resistor network (e.g., R1 = 100kΩ, R2 = 110kΩ) scales the 1.2V input to ~0.626V at RSTIN. The device guarantees RSTIN input current ≤±25nA, enabling high-value resistors that minimize power draw. The resulting threshold accuracy depends on resistor tolerance and temperature drift, but the MAX6719UTVHD3 itself contributes only ±2.5mV reference error - making it suitable for precision 1.2V rail monitoring.

Is the MAX6719UTVHD3 pin-compatible with other devices in the MAX6715–MAX6729 family?

The MAX6719UTVHD3 is pin-compatible with MAX6715, MAX6716, MAX6717, MAX6718, MAX6720, and MAX6721–MAX6722 in the 6-pin SOT23-6 package, sharing identical pin 1 (RST), pin 2 (GND), pin 3 (MR), pin 4 (VCC2), pin 5 (VCC1), and pin 6 (RSTIN/PFI). However, functional differences exist: MAX6715/17/19 have open-drain RST, while MAX6716/18/20 have push-pull RST; MAX6719/20 support RSTIN, whereas MAX6715–MAX6718 do not. Always verify function mapping - especially RST type and RSTIN/PFI assignment - before substitution.