Analog Devices Inc./Maxim Integrated MAX6722UTYDD3+

Overview

MAX6722UTYDD3+ 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 multivoltage embedded systems.

For engineers reviewing the MAX6722UTYDD3+ datasheet, MAX6722UTYDD3+ pinout, MAX6722UTYDD3+ application, or MAX6722UTYDD3+ equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% over temperature), guaranteed reset validity down to VCC = 0.8V, low 14µA supply current, and integrated watchdog with 35s startup + 1.12s normal timeout modes.

Technical Context

The MAX6722UTYDD3+ implements independent voltage comparators for VCC1 and VCC2, each with factory-trimmed thresholds (4.625V and 3.075V), hysteresis of 0.5%, and tempco of 20ppm/°C. Its reset logic asserts RST low when either supply falls below its threshold and holds for a fixed 210ms minimum timeout after recovery.

It integrates a dual-mode watchdog timer: 35s minimum initial timeout after any reset event (power-up, MR, or WDI timeout), followed by 1.12s minimum normal timeout triggered by WDI edge transitions. The MR input features internal 50kΩ pullup and 1µs minimum pulse width support.

Key Specifications

Pinout & Package

MAX6722UTYDD3+ uses a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm) with gull-wing leads, RoHS-compliant lead-free finish (+ suffix), and thermal pad not connected internally.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6722UTYDD3+, the MAX6722UTYDD5+ offers identical functionality with doubled reset timeout for slower peripherals, while the TPS3808G33DBVR trades dual monitoring and watchdog capability for lower unit cost and smaller footprint in basic 3.3V applications.

Availability

MAX6722UTYDD3+ is available at Aetrix Electronics and suitable for industrial PLC controllers, network router power management, and battery-powered IoT gateways requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6722UTYDD3+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.

The MAX6715–MAX6729 family was designed specifically for ultra-low-voltage, multirail microprocessor supervision in space-constrained embedded systems-emphasizing precision thresholds, low power, and integrated watchdog functionality.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6722UTYDD3+?

The MAX6722UTYDD3+ has factory-trimmed reset thresholds of 4.625V for VCC1 and 3.075V for VCC2, with ±1.5% tolerance over the full -40°C to +85°C operating range. These values are encoded in the "YD" suffix per Maxim's Reset Voltage Threshold Suffix Guide and are verified in production test-not adjustable or user-configurable. The MAX6722UTYDD3+ does not support external resistor networks for threshold adjustment.

Does the MAX6722UTYDD3+ support watchdog functionality, and what are its timing modes?

Yes, the MAX6722UTYDD3+ includes a dual-mode watchdog timer with two distinct timeout periods: a 35s minimum startup timeout after any reset event (power-up, MR, or WDI timeout), followed by a 1.12s minimum normal timeout that begins after the first valid WDI edge transition. This architecture prevents false resets during boot while ensuring rapid detection of software hangs during steady-state operation.

What type of reset output does the MAX6722UTYDD3+ provide, and how is it electrically configured?

The MAX6722UTYDD3+ provides a push-pull active-low RST output referenced to VCC1. When asserted, RST is driven to GND; when deasserted, it is actively driven to VCC1 (not open-drain). This eliminates the need for an external pullup resistor and ensures robust drive strength-capable of sinking 3.2mA at VCC1 ≥ 4.5V while maintaining VOL ≤ 0.4V.

Can the MAX6722UTYDD3+ monitor a third voltage rail, and does it support power-fail detection?

No, the MAX6722UTYDD3+ is a dual-voltage supervisor only-it monitors exactly two rails (VCC1 and VCC2) and does not include RSTIN, PFI, or PFO pins. For triple-voltage monitoring or power-fail functionality, consider the MAX6723UTYDD3+ (dual-supply + RSTIN) or MAX6728KA-YDD3+ (dual-supply + PFI/PFO). The MAX6722UTYDD3+ pinout lacks connections for auxiliary inputs.

What is the minimum supply voltage at which the MAX6722UTYDD3+ guarantees correct reset output logic state?

The MAX6722UTYDD3+ guarantees valid reset output logic state down to VCC1 or VCC2 = 0.8V-meaning RST will correctly assert low during undervoltage and deassert high upon recovery, even when supply rails dip near brownout levels. This specification is tested and guaranteed across temperature and process corners, enabling reliable operation in low-voltage industrial and battery-depleted scenarios.