Analog Devices Inc./Maxim Integrated MAX6722UTZWD3+T

Overview

MAX6722UTZWD3+T from Maxim Integrated is a dual-voltage microprocessor supervisory IC monitoring VCC1 (primary supply) and VCC2 (secondary supply), with manual reset input (MR), watchdog timer (WDI), and push-pull active-low RST output. It asserts reset when either supply falls below factory-trimmed thresholds (VTH1 = 3.075 V, VTH2 = 2.925 V), maintains reset for 210 ms (min), and operates from -40°C to +85°C in 6-pin SOT23-6 package. Used in telecom power sequencing and server board management.

For engineers reviewing the MAX6722UTZWD3+T datasheet, MAX6722UTZWD3+T pinout, MAX6722UTZWD3+T application, or MAX6722UTZWD3+T equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% over temp), guaranteed reset validity down to VCC1/VCC2 = 0.8 V, 14 µA typical supply current at 3.6 V, and integrated 35 s startup / 1.12 s normal watchdog timeout modes.

Technical Context

The MAX6722UTZWD3+T implements a dual-threshold voltage monitor with independent comparators for VCC1 and VCC2, each referenced to precision internal bandgap references. Its reset logic combines OR-ed fault conditions (VCC1 undervoltage, VCC2 undervoltage, MR low, WDI timeout) with a monolithic timeout counter ensuring minimum 210 ms reset assertion after all faults clear.

It integrates a dual-mode watchdog timer: a 35 s (min) initial timeout after any reset event enables safe boot sequence completion, followed by a 1.12 s (min) normal timeout requiring periodic WDI edge transitions. The push-pull RST output is referenced to VCC1 and sinks up to 3.2 mA at 4.5 V.

Key Specifications

Pinout & Package

MAX6722UTZWD3+T is housed in a 6-pin SOT23-6 package (2.9 mm × 1.6 mm × 1.1 mm), RoHS-compliant and lead-free (+T suffix). 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 dual-voltage supervisory applications.

Compared with MAX6722UTZWD3+T, MAX6721UTZWD3+T offers identical monitoring and timing but requires external pullup, while TPS3808G33DBVR reduces functionality to single-rail supervision without watchdog - making MAX6722UTZWD3+T the optimal choice for dual-supply systems requiring robust runtime supervision.

Availability

MAX6722UTZWD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and medical diagnostic devices requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6722UTZWD3+T 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 and mixed-signal ICs for power management, sensing, and interface applications, with emphasis on reliability and integration.

The MAX6715–MAX6729 family delivers ultra-low-voltage dual/triple supervisory circuits optimized for multivoltage embedded systems where space, power, and fault coverage are critical constraints.

FAQ

What are the factory-trimmed reset thresholds for MAX6722UTZWD3+T?

The MAX6722UTZWD3+T has VCC1 reset threshold of 3.075 V (typ) and VCC2 reset threshold of 2.925 V (typ), both with ±1.5% tolerance over -40°C to +85°C. These values are set by the "ZW" suffix per Maxim's Reset Voltage Threshold Suffix Guide and are laser-trimmed at wafer test. The MAX6722UTZWD3+T does not support adjustable thresholds - RSTIN and PFI pins are not implemented in this variant.

Does MAX6722UTZWD3+T support watchdog functionality, and what are its timing modes?

Yes, MAX6722UTZWD3+T includes a dual-mode watchdog timer: a 35 s (min) startup timeout after any reset event (power-up, MR, or watchdog timeout), followed by a 1.12 s (min) normal timeout requiring periodic WDI edge transitions. The first valid WDI transition after reset initiates the short timeout mode. This architecture ensures safe boot completion before enforcing strict runtime supervision - a key feature of the MAX6722UTZWD3+T.

What is the reset timeout period of MAX6722UTZWD3+T, and how is it configured?

The MAX6722UTZWD3+T has a fixed reset timeout period of 210 ms (minimum), denoted by the "D3" suffix in the part number. This value is factory-programmed and non-adjustable. The timeout begins when all monitored supplies (VCC1 and VCC2) rise above their respective thresholds and continues for the full 210 ms, ensuring the microprocessor remains held in reset long enough to complete internal initialization - a guaranteed behavior of the MAX6722UTZWD3+T.

Is MAX6722UTZWD3+T compatible with 1.8 V systems, and what is its minimum operating voltage?

Yes, MAX6722UTZWD3+T supports VCC1 inputs from 1.8 V to 5.0 V and VCC2 inputs from 0.9 V to 3.3 V. Critically, it guarantees correct reset output logic state down to VCC1 or VCC2 = 0.8 V - meaning the MAX6722UTZWD3+T remains functional and asserts valid reset even during deep brownout conditions common in battery-powered 1.8 V systems.

What package type and footprint does MAX6722UTZWD3+T use?

MAX6722UTZWD3+T is supplied in a 6-pin SOT23-6 package (JEDEC MO-178), measuring 2.9 mm × 1.6 mm × 1.1 mm with 0.95 mm pin pitch. The "+T" suffix confirms lead-free, RoHS-compliant construction. This compact footprint enables high-density PCB layouts in space-constrained applications such as telecom line cards and portable medical devices - a defining physical characteristic of the MAX6722UTZWD3+T.