Analog Devices Inc./Maxim Integrated MAX6722UTVDD3+T

Overview

MAX6722UTVDD3+T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit in 6-pin SOT23 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 (1.12s normal / 35s startup timeout). It ensures reliable system reset during power-up, brownout, or software fault in battery-powered telecom and embedded controllers.

For engineers reviewing the MAX6722UTVDD3+T datasheet, MAX6722UTVDD3+T pinout, MAX6722UTVDD3+T application, or MAX6722UTVDD3+T equivalent, key selection criteria include dual-supply monitoring range (1.8–5.0V / 0.9–3.3V), guaranteed reset validity down to VCC = 0.8V, low 14µA supply current, and integrated watchdog with long startup period for complex boot sequences.

Technical Context

The MAX6722UTVDD3+T implements independent voltage comparators for VCC1 and VCC2, each with factory-trimmed thresholds (4.625V ±125mV and 3.075V ±75mV), hysteresis of 0.5%, and temperature coefficient of 20ppm/°C. Reset assertion occurs when either supply falls below its threshold, and reset remains active for a minimum 210ms after both supplies recover.

It integrates a dual-mode watchdog timer: 35s minimum initial timeout after any reset event (power-up, MR, or watchdog timeout), followed by 1.12s minimum normal timeout triggered by WDI edge transitions. The push-pull RST output is referenced to VCC1 and sinks up to 3.2mA at 4.5V.

Key Specifications

Pinout & Package

MAX6722UTVDD3+T is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), RoHS-compliant and lead-free (+T suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6722UTVDD3+T, the MAX6722UTVDD5+T offers longer reset assertion for slower-booting processors, while the TPS3808G33DBVR reduces cost in single-rail designs but increases system complexity due to missing dual-monitoring and watchdog functions.

Availability

MAX6722UTVDD3+T is available at Aetrix Electronics and suitable for telecom line cards, industrial PLCs, battery-powered IoT gateways, and medical handheld devices requiring stable component supply across extended product lifecycles.

Supply support for MAX6722UTVDD3+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, sensing, and interface applications in industrial, automotive, and communications markets.

The MAX6715–MAX6729 family delivers ultra-low-voltage supervisory circuits optimized for multivoltage embedded systems where space, power, and reliability are critical-enabling compact, robust reset management without discrete components.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6722UTVDD3+T?

The MAX6722UTVDD3+T has factory-trimmed reset thresholds of 4.625V (±125mV) for VCC1 and 3.075V (±75mV) for VCC2, as indicated by the "VD" suffix per Maxim's Reset Voltage Threshold Suffix Guide. These values are guaranteed over -40°C to +85°C and include 0.5% hysteresis to prevent chatter near trip points. The MAX6722UTVDD3+T uses these precise thresholds to supervise 5V and 3.3V rails without external resistors.

Does the MAX6722UTVDD3+T support watchdog functionality, and what are its timing modes?

Yes, the MAX6722UTVDD3+T includes a dual-mode watchdog timer: a 35s minimum startup timeout after any reset event (power-up, MR, or prior watchdog timeout), followed by a 1.12s minimum normal timeout triggered by WDI edge transitions. This architecture allows safe boot of complex firmware while maintaining rapid fault detection during runtime. The MAX6722UTVDD3+T requires no external components to enable this feature.

What package type and pin count does the MAX6722UTVDD3+T use, and is it lead-free?

The MAX6722UTVDD3+T is supplied in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm body) with gull-wing leads. The "+T" suffix confirms it is lead-free and RoHS-compliant. Pinout is fixed per Maxim's datasheet: Pin 1 = RST (push-pull), Pin 2 = GND, Pin 3 = MR, Pin 4 = VCC2, Pin 5 = VCC1, Pin 6 = WDI. The MAX6722UTVDD3+T requires no footprint changes versus standard SOT23-6 footprints.

How does the MAX6722UTVDD3+T guarantee valid reset output when supply voltage drops below 1V?

The MAX6722UTVDD3+T guarantees correct reset logic state (RST low when asserted) down to VCC1 or VCC2 = 0.8V, verified across temperature and process corners. Its push-pull output stage remains functional at this level, eliminating need for external pull-down resistors. This behavior is intrinsic to the MAX6722UTVDD3+T's BiCMOS design and is not dependent on external biasing-critical for brownout resilience in industrial applications.

Can the MAX6722UTVDD3+T monitor three voltage rails, or is it limited to two?

The MAX6722UTVDD3+T is a dual-voltage supervisor and monitors only VCC1 and VCC2. It does not include RSTIN or PFI inputs-those features appear in variants like MAX6723–MAX6729. The "22" in MAX6722UTVDD3+T identifies it as a dual-monitor part with MR and WDI. For triple-voltage monitoring, engineers must select MAX6723UTVDD3+T or higher; the MAX6722UTVDD3+T is optimized for cost-sensitive dual-rail systems.