Analog Devices Inc./Maxim Integrated MAX6719UTTZD1+

Overview

MAX6719UTTZD1+ from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in a 6-pin SOT23 package, monitoring VCC1 (1.8V–5.0V), VCC2 (0.9V–3.3V), and an externally adjustable third supply via RSTIN (threshold = 626.5 mV). It asserts active-low open-drain reset during undervoltage or manual reset events, with 1.1 ms minimum timeout, and operates from −40°C to +85°C. It is used in multivoltage embedded systems requiring reliable power sequencing and brownout protection.

For engineers reviewing the MAX6719UTTZD1+ datasheet, MAX6719UTTZD1+ pinout, MAX6719UTTZD1+ application, or MAX6719UTTZD1+ equivalent, key selection criteria include its triple-supply monitoring capability, guaranteed reset validity down to VCC1/VCC2 = 0.8 V, 14 µA typical supply current at 3.6 V, and compatibility with battery-operated and telecom equipment where low quiescent current and precise threshold hysteresis (0.5%) are critical.

Technical Context

The MAX6719UTTZD1+ integrates dual factory-trimmed voltage comparators for VCC1 and VCC2, plus a high-impedance RSTIN input referenced to a 626.5 mV internal bandgap reference. Its reset logic combines OR-ed fault conditions (VCC1/VCC2 undervoltage, RSTIN undervoltage, MR assertion) and enforces a fixed minimum timeout period after recovery.

It features an open-drain RST output with guaranteed VOL ≤ 0.4 V at ISINK = 3.2 mA (VCC ≥ 4.5 V), internal 50 kΩ MR pullup, and immunity to VCC transients < 20 µs (depending on overdrive). No watchdog or power-fail functions are included-confirmed by Selector Guide and Pin Description tables.

Key Specifications

Pinout & Package

MAX6719UTTZD1+ uses a 6-pin SOT23-6 package with exposed pad (not electrically connected), footprint compatible with JEDEC MO-178AA. Pin 1 is marked with dot; device orientation follows standard SOT23 pinout convention.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6720UTTZD1+, MAX6719UTTZD1+ provides open-drain flexibility for bus sharing and level translation; compared with TPS3808G33DBVR, it adds critical RSTIN-based third-rail monitoring essential for modern multivoltage SoC platforms.

Availability

MAX6719UTTZD1+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and portable medical devices requiring stable component supply, long-lifecycle support, and guaranteed reset behavior under brownout conditions.

Supply support for MAX6719UTTZD1+ 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 delivers ultra-low-voltage, triple-supply supervisory circuits optimized for space-constrained, battery-sensitive systems where reliability across wide voltage and temperature ranges is non-negotiable.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on MAX6719UTTZD1+?

The MAX6719UTTZD1+ uses suffix "TZ" per Maxim's Reset Voltage Threshold Suffix Guide: VCC1 threshold is 3.075 V (min 3.000 V, max 3.150 V) and VCC2 threshold is 2.188 V (min 2.125 V, max 2.250 V). These factory-trimmed values are laser-adjusted and specified over −40°C to +85°C.

Does MAX6719UTTZD1+ include a watchdog timer or power-fail function?

No. Per the Selector Guide and Pin Description, MAX6719UTTZD1+ supports only triple-voltage monitoring (VCC1, VCC2, RSTIN), manual reset (MR), and open-drain RST output. Watchdog (WDI) and power-fail (PFI/PFO) functions are absent - confirmed by omission from its row in the Selector Guide and lack of WDI/PFI pins in its pinout.

What is the maximum load current the RST output of MAX6719UTTZD1+ can sink?

The RST output of MAX6719UTTZD1+ is open-drain and guaranteed to sink up to 3.2 mA while maintaining VOL ≤ 0.4 V (at VCC ≥ 4.5 V). At lower VCC (e.g., 1.8 V), it sinks 100 µA with VOL ≤ 0.3 V. An external pullup resistor is required; typical values range from 10 kΩ to 100 kΩ depending on bus capacitance and rise-time requirements.

Can MAX6719UTTZD1+ monitor a negative supply voltage?

No - MAX6719UTTZD1+ is not designed for negative supply monitoring. Its RSTIN input is referenced to GND and requires positive input voltage ≥ 0 V. While the MAX6728/MAX6729 series supports negative monitoring via PFI with external biasing, MAX6719UTTZD1+ lacks PFI functionality and has no specification for negative RSTIN operation.

What does the "D1" suffix in MAX6719UTTZD1+ indicate?

The "D1" suffix in MAX6719UTTZD1+ specifies a 1.1 ms minimum reset timeout period, per Maxim's Reset Timeout Period Suffix Guide. This value is fixed by internal capacitor trimming and is guaranteed over temperature (−40°C to +85°C) and supply voltage (0.8 V to 5.5 V).