Analog Devices Inc./Maxim Integrated MAX6723AUTWGD3+

Overview

MAX6723AUTWGD3+ from Maxim Integrated is a dual-voltage microprocessor supervisory IC in 6-pin SOT23 package, monitoring VCC1 (primary) and VCC2 (secondary) supplies with factory-trimmed thresholds - specifically 4.625V (VTH1) and 3.075V (VTH2) - and featuring an externally adjustable RSTIN input (626.5mV reference), 210ms reset timeout, watchdog timer (35s startup / 1.12s normal), and push-pull active-low RST output. It ensures reliable system reset in telecom power management and industrial embedded controllers.

For engineers reviewing the MAX6723AUTWGD3+ datasheet, MAX6723AUTWGD3+ pinout, MAX6723AUTWGD3+ application, or MAX6723AUTWGD3+ equivalent, key selection considerations include dual-supply threshold accuracy (±1.5% over -40°C to +125°C), guaranteed reset validity down to VCC1/VCC2 = 0.8V, low 14µA typical supply current at 3.6V, and integrated watchdog with long startup period for safe boot sequencing.

Technical Context

The MAX6723AUTWGD3+ implements independent voltage comparators for VCC1 and VCC2, each with 20ppm/°C tempco and 0.5% hysteresis referenced to nominal threshold. Its reset logic asserts RST low when either supply falls below its trimmed threshold, and holds reset for a fixed 210ms (min) timeout after all monitored voltages recover.

It integrates a dual-mode watchdog timer: a 35s (min) initial timeout after any reset event enables full system initialization, followed by a 1.12s (min) normal timeout requiring periodic WDI transitions. The RSTIN input uses a precision 626.5mV internal reference to monitor a third voltage via external resistor divider, with ≤100nA input leakage.

Key Specifications

Pinout & Package

MAX6723AUTWGD3+ is housed in a 6-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), RoHS-compliant and lead-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6724AUTWGD3+, MAX6723AUTWGD3+ provides higher VCC2 threshold alignment for standard 3.3V rails, reducing false trips during ripple; versus TPS3808G33DBVR, it delivers integrated dual-rail supervision and watchdog - eliminating board space and BOM cost of discrete solutions.

Availability

MAX6723AUTWGD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and automotive infotainment systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6723AUTWGD3+ 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 connectivity in demanding industrial and automotive environments.

The MAX6715A–MAX6729A family delivers ultra-low-voltage, multi-rail supervisory functions optimized for space-constrained systems needing guaranteed reset integrity, watchdog safety, and flexible voltage monitoring - especially where dual or triple supply sequencing is critical.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6723AUTWGD3+?

The MAX6723AUTWGD3+ has factory-trimmed reset thresholds of 4.625V (VTH1) for VCC1 and 3.075V (VTH2) for VCC2, with ±1.5% tolerance over -40°C to +125°C. These values are encoded in the part number suffix "WG" per Maxim's Reset Voltage Threshold Suffix Guide and are confirmed in the Electrical Characteristics table of the official datasheet.

Does the MAX6723AUTWGD3+ support watchdog functionality, and what are its timing modes?

Yes, the MAX6723AUTWGD3+ includes a dual-mode watchdog timer: a 35s minimum startup timeout after any reset event (power-up, MR, or watchdog-triggered), followed by a 1.12s minimum normal timeout requiring periodic WDI transitions. This architecture prevents false timeouts during boot while ensuring rapid fault detection during runtime - a key feature distinguishing MAX6723AUTWGD3+ from basic supervisors.

Can the MAX6723AUTWGD3+ monitor a third voltage, and how is it implemented?

Yes, the MAX6723AUTWGD3+ monitors a third voltage via the RSTIN pin, which compares the applied voltage to an internal 626.5mV reference. A resistor divider scales the target supply (e.g., 1.2V, 1.8V) to match this reference. With ≤100nA input leakage, high-value resistors minimize current draw - enabling precise, low-power auxiliary monitoring not possible with fixed-threshold alternatives.

What is the reset timeout period of the MAX6723AUTWGD3+, and is it adjustable?

The MAX6723AUTWGD3+ has a fixed reset timeout period of 210ms (minimum), indicated by the "D3" suffix in the part number. This value is factory-set and non-adjustable; it ensures sufficient hold time for microprocessor initialization across temperature and voltage variations, and is validated per Maxim's Reset Timeout Period Suffix Guide.

Is the MAX6723AUTWGD3+ compatible with 0.8V supply operation, and how does it ensure reset validity?

Yes, the MAX6723AUTWGD3+ guarantees correct reset output logic state (RST low when asserted) even when VCC1 or VCC2 drops to 0.8V - a critical specification for brownout resilience. This is achieved through internal biasing and rail-to-rail comparator design, enabling fail-safe shutdown in systems experiencing severe supply sag, unlike many supervisors that lose reset integrity below 1.2V.