Analog Devices Inc./Maxim Integrated MAX6722AUTSYD3+T

Overview

MAX6722AUTSYD3+T from Maxim Integrated is a dual-supply ultra-low-voltage microprocessor supervisory circuit in SOT23-6 package, monitoring VCC1 (1.8V–5.0V) and VCC2 (0.9V–3.3V) with factory-trimmed reset thresholds, 140ms minimum reset timeout, and push-pull active-low RST output. It guarantees valid reset assertion down to VCC1 or VCC2 = 0.8V and supports manual reset input (MR) and watchdog disable functionality for embedded power management in multivoltage systems.

For engineers reviewing the MAX6722AUTSYD3+T datasheet, MAX6722AUTSYD3+T pinout, MAX6722AUTSYD3+T application, or MAX6722AUTSYD3+T equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% over temperature), low 14µA typical supply current at 3.6V, immunity to sub-20µs VCC transients, and guaranteed operation across –40°C to +125°C industrial temperature range.

Technical Context

The MAX6722AUTSYD3+T integrates two independent voltage comparators with internal 20ppm/°C tempco references, a programmable reset timeout timer (140ms min), and logic-controlled reset assertion/deassertion sequencing. Its dual-supply architecture enables simultaneous monitoring of core (VCC2) and I/O (VCC1) rails in SoC-based systems without external components.

It features a dedicated MR input with 50kΩ internal pullup to VCC1, glitch rejection ≤100ns, and 200ns MR-to-RST delay; all reset outputs are push-pull referenced to VCC1, eliminating need for external pullups. The device lacks RSTIN, PFI, PFO, or WDI pins - confirming it is a fixed dual-threshold variant without auxiliary monitoring or watchdog capability.

Key Specifications

Pinout & Package

SOT23-6 package (package code U6+1), 1.6mm × 2.9mm footprint, 1.1mm height, thermal resistance θJA = 115°C/W on multilayer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and ADM6710LAKSZ-RL, the MAX6722AUTSYD3+T delivers matched dual-threshold accuracy without external components, guaranteed 140ms timeout, and lowest effective system-level BOM count for fixed 2.85V/2.85V supervision in harsh environments.

Availability

MAX6722AUTSYD3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive ADAS modules, telecom optical line terminals, medical infusion pumps, and set-top boxes requiring stable component supply across extended temperature and long product lifecycles.

Supply support for MAX6722AUTSYD3+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 high-performance analog and mixed-signal ICs for demanding industrial, automotive, and communications applications, emphasizing reliability, precision, and integration.

The MAX6715A–MAX6729A family delivers compact, ultra-low-voltage supervisory circuits optimized for multivoltage SoC and µP systems where space, power, and thermal robustness are critical constraints.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6722AUTSYD3+T?

The MAX6722AUTSYD3+T has factory-trimmed reset thresholds of 2.850V (typ) for both VCC1 and VCC2, with ±1.5% tolerance over –40°C to +125°C. This matches the "S" suffix in the Reset Voltage Threshold Suffix Guide and is confirmed in the Electrical Characteristics table for VTH1 and VTH2. The MAX6722AUTSYD3+T does not support adjustable thresholds or third-supply monitoring.

Does the MAX6722AUTSYD3+T include a watchdog timer or power-fail input?

No, the MAX6722AUTSYD3+T does not include watchdog timer (WDI), power-fail input (PFI), or power-fail output (PFO) functionality. Pin 6 is NC, and the device belongs to the MAX6722A variant group - confirmed by the Pin Description table showing only RST, GND, MR, VCC2, and VCC1 connections. Watchdog and PFI features appear only on MAX6728A/MAX6729A/MAX6797A variants.

What is the reset timeout period for the MAX6722AUTSYD3+T, and is it adjustable?

The MAX6722AUTSYD3+T has a fixed minimum reset timeout period of 140ms, corresponding to the "D3" suffix in the Reset Timeout Period Suffix Guide. It is factory-programmed and not adjustable via external components or pins. This value is guaranteed over temperature and supply voltage, ensuring consistent reset hold time for µP initialization sequences.

Can the MAX6722AUTSYD3+T operate with VCC1 = 1.8V and VCC2 = 1.2V simultaneously?

Yes, the MAX6722AUTSYD3+T is fully specified to operate with VCC1 as low as 0.8V and VCC2 as low as 0.8V, including the combination of VCC1 = 1.8V and VCC2 = 1.2V. Its reset comparators remain functional, and the push-pull RST output maintains VOH ≥0.8×VCC1 and VOL ≤0.3V across this range, as verified in the Absolute Maximum Ratings and Electrical Characteristics sections.

Is the MAX6722AUTSYD3+T RoHS-compliant and lead-free?

Yes, the "+T" suffix in MAX6722AUTSYD3+T indicates RoHS-compliant, lead-free packaging per JEDEC J-STD-609. The device uses matte tin (Sn) termination on the SOT23-6 package and meets IPC/JEDEC J-STD-020 moisture sensitivity level 1 (MSL1) for unlimited floor life at ≤30°C/60% RH.