Analog Devices Inc./Maxim Integrated MAX6722UTSHD3-T

Overview

MAX6722UTSHD3-T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in SOT23-6 package, monitoring VCC1 (4.625V threshold) and VCC2 (3.075V threshold) with 210ms reset timeout, push-pull active-low RST output, manual reset input (MR), and watchdog timer (WDI). It ensures reliable system boot and brownout recovery in low-power embedded controllers.

For engineers reviewing the MAX6722UTSHD3-T datasheet, MAX6722UTSHD3-T pinout, MAX6722UTSHD3-T application, or MAX6722UTSHD3-T equivalent, key selection criteria include dual-supply reset assertion down to 0.8V, 14µA typical supply current at 3.6V, guaranteed reset validity during VCC1/VCC2 undervoltage, and integrated 35s startup + 1.12s normal watchdog timing.

Technical Context

The MAX6722UTSHD3-T implements independent voltage comparators for primary (VCC1) and secondary (VCC2) supplies, each with factory-trimmed thresholds (4.625V and 3.075V respectively), hysteresis of 0.5%, and tempco of 20ppm/°C. Reset assertion occurs when either supply falls below its threshold, and reset remains asserted for ≥210ms after both supplies recover.

It integrates a dual-mode watchdog timer: 35s minimum initial timeout after power-up/manual reset, transitioning to 1.12s minimum normal timeout after first WDI edge detection. The push-pull RST output is referenced to VCC1 and sinks up to 3.2mA at 4.5V while maintaining VOL ≤ 0.4V.

Key Specifications

Pinout & Package

MAX6722UTSHD3-T is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), surface-mount, lead-free compatible, with thermal pad omitted. Pin 1 is marked by dot; pin numbering follows standard SOT23 counterclockwise from mark.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6722UTSHD3-T, the MAX6722UTSHD5-T offers longer reset hold time with identical functionality, while TPS3808G33DBVR provides ultra-low quiescent current but sacrifices dual-rail monitoring and watchdog capability-making it unsuitable for systems requiring coordinated multi-rail reset or runtime processor supervision.

Availability

MAX6722UTSHD3-T is available at Aetrix Electronics and suitable for industrial PLC controllers, network router power management, medical infusion pumps, and smart energy meters requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6722UTSHD3-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 industrial, communications, and computing markets, with emphasis on power management and reliability.

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

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on MAX6722UTSHD3-T?

The MAX6722UTSHD3-T has factory-trimmed reset thresholds of 4.625V for VCC1 and 3.075V for VCC2, as indicated by the "SH" suffix per Maxim's Reset Voltage Threshold Suffix Guide. These values are specified at 25°C with ±125mV tolerance over temperature and supply variations, ensuring precise rail monitoring without external resistor networks.

Does MAX6722UTSHD3-T support manual reset, and how is it implemented?

Yes, MAX6722UTSHD3-T includes an active-low manual reset input (MR) on pin 3, featuring an internal 50kΩ pullup to VCC1. Driving MR low forces immediate reset assertion, which persists for the full 210ms timeout period after MR returns high. No external components are required, and MR accepts TTL/CMOS logic levels or open-drain signals.

How does the watchdog timer function in MAX6722UTSHD3-T, and what are its timing modes?

The MAX6722UTSHD3-T incorporates a dual-mode watchdog timer: a 35s minimum initial timeout after power-up or manual reset, followed by a 1.12s minimum normal timeout after the first valid WDI edge. This architecture supports lengthy boot sequences while enabling rapid detection of runtime hangs-critical for real-time embedded systems relying on MAX6722UTSHD3-T for fail-safe operation.

What is the supply current consumption of MAX6722UTSHD3-T, and how does it vary with voltage?

MAX6722UTSHD3-T draws 14µA typical supply current at 3.6V, with ICC1 contributing ~10µA and ICC2 ~4µA. Total current remains stable across temperature (-40°C to +85°C) and scales linearly with VCC1/VCC2-e.g., ~9µA at 2.5V and ~28µA at 5.5V-enabling accurate battery-life estimation in portable and energy-harvesting applications using MAX6722UTSHD3-T.

Can MAX6722UTSHD3-T operate reliably during deep brownout conditions?

Yes, MAX6722UTSHD3-T guarantees valid reset output logic state down to VCC1 or VCC2 = 0.8V, verified across temperature. This allows the device to assert reset correctly even during severe undervoltage events, preventing corrupted firmware execution. The push-pull RST output maintains VOL ≤ 0.4V at 3.2mA sink under these conditions, ensuring robust interface with downstream logic.