Analog Devices Inc./Maxim Integrated MAX6722UTZWD3+

Overview

MAX6722UTZWD3+ 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, manual reset input, and watchdog timer. It asserts active-low push-pull RST when either supply drops below threshold and maintains reset for ≥210ms after recovery - used in telecom power management and industrial embedded controllers requiring reliable brownout detection.

For engineers reviewing the MAX6722UTZWD3+ datasheet, MAX6722UTZWD3+ pinout, MAX6722UTZWD3+ application, or MAX6722UTZWD3+ equivalent, key selection criteria include dual-supply monitoring range (1.58–4.63V / 0.79–3.08V), guaranteed reset validity down to VCC = 0.8V, low 14µA supply current at 3.6V, and integrated watchdog with 35s startup + 1.12s normal timeout.

Technical Context

The MAX6722UTZWD3+ implements two independent voltage comparators with factory-trimmed thresholds (VTH1 = 4.625V, VTH2 = 3.075V), each referenced to internal bandgap references with 20ppm/°C tempco and 0.5% hysteresis. Its push-pull RST output is referenced to VCC1 and drives low during fault conditions with VOL ≤ 0.4V at ISINK = 3.2mA.

It integrates a dual-mode watchdog timer: 35s minimum initial timeout after reset for system boot, then automatic transition to 1.12s minimum normal timeout upon first WDI edge detection. The MR input features internal 50kΩ pullup to VCC1 and 1µs minimum pulse width requirement.

Key Specifications

Pinout & Package

MAX6722UTZWD3+ uses a 6-pin SOT23-6 package with gull-wing leads, 1.27mm pitch, and thermal pad option (not electrically connected). Dimensions: 2.9mm × 1.6mm × 1.1mm (L × W × H).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and ADM6705ARTZ-REEL7, MAX6722UTZWD3+ uniquely supports simultaneous dual-rail monitoring with factory-trimmed thresholds, integrated watchdog with startup/normal modes, and push-pull RST - making it optimal for complex embedded systems requiring coordinated power sequencing and runtime supervision.

Availability

MAX6722UTZWD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial control, and medical imaging applications requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.

Supply support for MAX6722UTZWD3+ 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 delivers ultra-low-voltage dual/triple supervisory circuits targeting multivoltage embedded systems where reliability, small size, and low power are essential - especially in space-constrained, battery-aware, or thermally challenging environments.

FAQ

What is the exact reset threshold voltage for VCC1 on the MAX6722UTZWD3+?

The MAX6722UTZWD3+ has a factory-trimmed VCC1 reset threshold of 4.625V (minimum 4.500V, maximum 4.750V) with 0.5% hysteresis. This value is encoded in the "W" suffix per Maxim's Reset Voltage Threshold Suffix Guide and is verified across -40°C to +85°C operating temperature.

Does the MAX6722UTZWD3+ support monitoring a third voltage rail?

No, the MAX6722UTZWD3+ is a dual-voltage supervisor and does not include RSTIN or PFI inputs. Only MAX6719/MAX6720/MAX6723–MAX6729 variants support triple-voltage monitoring. The MAX6722UTZWD3+ monitors only VCC1 and VCC2.

What is the watchdog timeout behavior after power-up for the MAX6722UTZWD3+?

After power-up or any reset event, the MAX6722UTZWD3+ enters a 35s minimum initial watchdog timeout period. Upon detecting the first valid edge on WDI, it transitions to the 1.12s minimum normal timeout mode - ensuring safe boot time before runtime supervision begins.

Can the MAX6722UTZWD3+ operate with VCC1 = 1.8V?

Yes, the MAX6722UTZWD3+ operates with VCC1 from 1.8V to 5.0V. However, its VCC1 reset threshold is fixed at 4.625V, so it cannot supervise 1.8V rails directly. For 1.8V monitoring, use VCC2 (3.075V threshold) with appropriate divider or select a variant with lower VTH1.

Is the RST output of the MAX6722UTZWD3+ push-pull or open-drain?

The MAX6722UTZWD3+ features a push-pull RST output referenced to VCC1, capable of sourcing up to 800µA and sinking up to 3.2mA. This eliminates the need for an external pullup resistor and provides stronger drive than open-drain alternatives.