Analog Devices Inc./Maxim Integrated MAX6732UTSVD3+T

Overview

The MAX6732UTSVD3+T from Maxim Integrated is a dual-voltage microprocessor supervisor IC with active-low open-drain reset and watchdog outputs, factory-set VCC1/VCC2 thresholds of +2.925V/+2.188V, 210ms reset timeout, and -40°C to +85°C operation - used to ensure reliable power-on sequencing and fault recovery in multivoltage embedded systems.

For engineers reviewing the MAX6732UTSVD3+T datasheet, MAX6732UTSVD3+T pinout, MAX6732UTSVD3+T application, or MAX6732UTSVD3+T equivalent, key selection criteria include dual-supply monitoring capability, open-drain RST/WDO outputs, manual reset omission, SOT23-6 packaging, and compatibility with telecom, industrial, and portable equipment requiring stable brownout detection and watchdog supervision.

Technical Context

The MAX6732UTSVD3+T monitors two fixed supply rails (VCC1 and VCC2) using precision internal voltage references, asserting RST when either falls below its factory-trimmed threshold. It features an independent watchdog timer with 35s startup delay and 1.68s normal-mode timeout, cleared by WDI transitions.

Its open-drain RST and WDO outputs require external pullups and remain valid down to VCC ≥ +0.8V. The device lacks MR and RSTIN pins - confirming it is a dual-monitor-only variant without manual reset or adjustable input - and operates from 0.8V to 5.5V with 14µA typical supply current.

Key Specifications

Pinout & Package

Package: SOT23-6, surface-mount, 6-pin, lead(Pb)-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6732UTLTD3+T and TPS3808G33DBVR, the MAX6732UTSVD3+T uniquely delivers matched 2.925V/2.188V thresholds with independent watchdog output in a minimal SOT23-6 footprint - making it optimal for compact, dual-rail, fail-safe embedded systems where precise low-voltage rail coordination is critical.

Availability

MAX6732UTSVD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and portable medical devices requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for MAX6732UTSVD3+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 demanding industrial, automotive, and communications applications.

The MAX6730–MAX6735 family was engineered specifically for robust, low-power microprocessor supervision in multivoltage systems - emphasizing accurate threshold matching, glitch immunity, and independent watchdog functionality.

FAQ

What is the reset threshold voltage for VCC1 on the MAX6732UTSVD3+T?

The MAX6732UTSVD3+T has a factory-set VCC1 reset threshold of +2.925V (falling edge), corresponding to the 'S' suffix in the part number. This value is trimmed and guaranteed over temperature, with ±1.5% tolerance and 20ppm/°C tempco. The threshold remains stable across the full -40°C to +85°C operating range, ensuring consistent brownout detection in the MAX6732UTSVD3+T.

Does the MAX6732UTSVD3+T include a manual reset input (MR)?

No, the MAX6732UTSVD3+T does not include a manual reset input. Per the MAX6730–MAX6735 selector guide and pin configuration table, only MAX6730/MAX6731/MAX6734/MAX6735 variants feature MR. The MAX6732UTSVD3+T is a dual-monitor-only device with pins limited to RST, GND, WDO, VCC1, WDI, and VCC2 - confirmed by its SOT23-6 pinout and absence of MR in all electrical characteristics tables for this variant.

What is the watchdog timeout period for the MAX6732UTSVD3+T in normal operation?

The MAX6732UTSVD3+T has a normal-mode watchdog timeout period of 1.68s (minimum), as specified in the Electrical Characteristics table under "tWD-S". After the initial 35s startup delay following reset, the watchdog timer switches to this shorter interval. A valid edge on WDI resets the timer; failure to provide such an edge within 1.68s causes WDO to assert low. This behavior is intrinsic to the MAX6732UTSVD3+T's dual-mode watchdog architecture.

Is the MAX6732UTSVD3+T compatible with 1.8V supply rails?

No, the MAX6732UTSVD3+T is not designed to monitor 1.8V rails directly. Its factory-set VCC2 threshold is +2.188V, and the lowest VCC2 option available in the family is +0.788V (RD suffix). While the device itself operates from VCC = +0.8V to +5.5V, its fixed thresholds do not include 1.8V. For 1.8V supervision, consider MAX6732UTSYD3+T (VCC2 = +2.188V) with external resistor divider on VCC2, or select a different variant like MAX6732UTRVD3+T (VCC2 = +1.575V) - but note the MAX6732UTSVD3+T itself is fixed at +2.188V.

What package type and RoHS status does the MAX6732UTSVD3+T use?

The MAX6732UTSVD3+T uses a 6-pin SOT23 package (outline 21-0058), with lead(Pb)-free, RoHS-compliant construction indicated by the "+T" suffix. It measures 2.9mm × 1.6mm × 1.1mm and features gull-wing leads suitable for reflow soldering. Thermal resistance is θJA = 230°C/W on a standard four-layer board. This package is standard for the MAX6732UTSVD3+T and fully documented in Maxim's package database.