Analog Devices Inc./Maxim Integrated MAX6719UTTZD3

Overview

MAX6719UTTZD3 from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in 6-pin SOT23 package, monitoring VCC1 (primary), VCC2 (secondary), and RSTIN (auxiliary) supply rails with factory-trimmed thresholds of 4.625V and 3.075V and 210ms reset timeout. It asserts active-low open-drain reset (RST) when any monitored voltage falls below its threshold, maintains reset for ≥210ms after recovery, and supports manual reset (MR) and watchdog-free operation. Used in multivoltage telecom power systems requiring reliable brownout detection and system-level reset coordination.

For engineers reviewing the MAX6719UTTZD3 datasheet, MAX6719UTTZD3 pinout, MAX6719UTTZD3 application, or MAX6719UTTZD3 equivalent, this page delivers verified functional identity, confirmed dual/third-supply monitoring capability, validated 6-pin SOT23-6 package mapping, exact reset timing (210ms min), and real-world substitution options - all extracted from Maxim's official documentation and ordering guide.

Technical Context

The MAX6719UTTZD3 implements a dual-threshold comparator architecture: one for VCC1 (4.625V ±125mV), one for VCC2 (3.075V ±75mV), and a third adjustable comparator referenced to a 626.5mV internal bandgap at RSTIN. Reset assertion is latched by an internal timeout timer with fixed 210ms minimum duration, independent of supply ramp rate or transient duration.

It features open-drain RST output referenced to VCC1, internal 50kΩ MR pullup, guaranteed reset validity down to VCC1 or VCC2 = 0.8V, and immunity to sub-20µs VCC transients exceeding 100mV overdrive - enabling robust operation in noisy, battery-backed, or DC/DC-derived power domains.

Key Specifications

Pinout & Package

MAX6719UTTZD3 is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), surface-mount, lead-free compliant. Pin 1 is marked with a dot; device orientation follows JEDEC MO-178 standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6719UTTZD3, MAX6720UTTZD3 offers simplified drive strength at the cost of interface flexibility, while TPS3808G33DBVR reduces functionality to meet basic single-rail requirements - making MAX6719UTTZD3 the only option supporting true triple-supply coordination with open-drain compatibility.

Availability

MAX6719UTTZD3 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and portable medical devices requiring stable component supply, long-term lifecycle support, and guaranteed factory-trimmed voltage thresholds.

Supply support for MAX6719UTTZD3 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 multivoltage embedded systems needing compact, low-power, factory-calibrated supervision of primary, secondary, and auxiliary rails - with emphasis on telecom and industrial reliability.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on MAX6719UTTZD3?

The MAX6719UTTZD3 has factory-trimmed reset thresholds of 4.625V (±125mV) for VCC1 and 3.075V (±75mV) for VCC2, as defined by the 'TZ' suffix per Maxim's Reset Voltage Threshold Suffix Guide. These values are measured at TA = +25°C and exhibit ±20ppm/°C tempco, ensuring stability across the -40°C to +85°C operating range. The MAX6719UTTZD3 does not require external resistors to set these thresholds.

Does MAX6719UTTZD3 support monitoring a third voltage, and how is it configured?

Yes, MAX6719UTTZD3 supports third-voltage monitoring via the RSTIN pin, which compares the applied voltage against an internal 626.5mV bandgap reference. To monitor a custom rail (e.g., 1.2V), connect a resistor divider between the rail and GND, with the midpoint fed to RSTIN. The threshold is calculated as V_{EXT_TH} = 626.5mV × (R1 + R2)/R2. MAX6719UTTZD3 guarantees ±25nA input leakage, enabling high-resistance dividers to minimize power loss.

What is the function of the MR pin on MAX6719UTTZD3, and does it require external components?

The MR (Manual Reset) pin on MAX6719UTTZD3 is an active-low input with an internal 50kΩ pullup to VCC1. Pulling MR low forces an immediate reset assertion, which persists for the full 210ms timeout period after MR returns high. No external components are required - MR can be driven directly by a pushbutton (to GND) or logic signal. If unused, MR may be left floating or tied to VCC1; no debouncing circuitry is needed due to built-in 100ns glitch rejection.

Is MAX6719UTTZD3 compatible with bidirectional microprocessor reset pins?

Yes, MAX6719UTTZD3 is fully compatible with bidirectional µP reset pins because its RST output is open-drain. This allows safe wired-OR connection with the µP's internal reset driver without contention. A 4.7kΩ series resistor between RST and the µP pin (as recommended in Maxim's Application Note) prevents logic contention during bidirectional transitions. Push-pull alternatives like MAX6720UTTZD3 are not suitable for this topology without additional isolation.

What is the supply current consumption of MAX6719UTTZD3 across its operating voltage range?

MAX6719UTTZD3 draws 14µA typical supply current at 3.6V, with ICC1 = 10µA (max) at VCC1 < 3.6V and ICC2 = 4µA (max) at VCC2 < 2.75V. Total current remains below 39µA across the full 0.8V–5.5V supply range and -40°C to +85°C temperature span, as verified in Maxim's Electrical Characteristics table. This ultra-low quiescent current makes MAX6719UTTZD3 ideal for battery-backed or energy-harvesting systems.