Analog Devices Inc./Maxim Integrated MAX6724UTSVD3-T

Overview

MAX6724UTSVD3-T from Maxim Integrated is a triple-voltage microprocessor supervisory IC monitoring VCC1 (primary), VCC2 (secondary), and an externally adjustable RSTIN input down to 0.626V. It provides push-pull active-low reset output, manual reset input, and watchdog timer with 35s startup/1.12s normal timeout. Designed for multivoltage embedded systems requiring reliable power-up sequencing and brownout protection.

For engineers reviewing the MAX6724UTSVD3-T datasheet, MAX6724UTSVD3-T pinout, MAX6724UTSVD3-T application, or MAX6724UTSVD3-T equivalent, key selection criteria include its factory-trimmed dual-threshold architecture (VTH1 = 3.075V, VTH2 = 2.925V), 210ms min reset timeout, guaranteed reset validity down to VCC1/VCC2 = 0.8V, and integrated watchdog with long-startup capability for complex boot sequences.

Technical Context

The MAX6724UTSVD3-T implements a dual-threshold voltage monitor with independent comparators for VCC1 and VCC2, plus a high-impedance RSTIN input referenced to a 626.5mV internal bandgap. Its reset logic asserts RST low when any monitored 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 reset events enables full system initialization, followed by 1.12s minimum normal-mode timeout triggered by WDI edge transitions. The push-pull RST output is referenced to VCC1 and sinks up to 3.2mA at 4.5V.

Key Specifications

Pinout & Package

MAX6724UTSVD3-T is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained PCB layouts while maintaining thermal performance across industrial temperature range.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6724UTSVD3-T, MAX6723UTSVD3-T offers identical monitoring and timing but requires external pullup for reset signaling, while TPS3808G33DBVR lacks RSTIN adjustability and watchdog - making MAX6724UTSVD3-T the only option supporting three-rail supervision with integrated watchdog and push-pull drive.

Availability

MAX6724UTSVD3-T is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom line cards, medical handheld diagnostics, and network router SoC modules requiring stable component supply and long-term lifecycle support.

Supply support for MAX6724UTSVD3-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) is a semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.

The MAX6715–MAX6729 family delivers ultra-low-voltage supervisory circuits targeting multivoltage embedded systems where reliability, small footprint, and flexible reset timing are critical.

FAQ

What are the factory-trimmed reset thresholds for MAX6724UTSVD3-T?

The MAX6724UTSVD3-T has VCC1 reset threshold of 3.075V (typ) and VCC2 reset threshold of 2.925V (typ), both factory-trimmed with ±1.5% tolerance. These values correspond to the 'TS' suffix per Maxim's Reset Voltage Threshold Suffix Guide and are optimized for 3.3V and 3.0V rail supervision respectively. The RSTIN input uses a fixed 626.5mV internal reference for external voltage monitoring.

Does MAX6724UTSVD3-T support watchdog functionality, and what are its timing modes?

Yes, MAX6724UTSVD3-T includes a dual-mode watchdog timer. After any reset event (power-up, brownout, MR, or watchdog timeout), it enters a 35s minimum startup mode to allow full system initialization. Once the first valid WDI edge occurs, it switches to 1.12s minimum normal-mode timeout. This architecture prevents false resets during boot while enabling rapid fault detection during runtime - a key differentiator of the MAX6724UTSVD3-T.

What is the reset timeout period of MAX6724UTSVD3-T, and how is it set?

The MAX6724UTSVD3-T has a fixed 210ms minimum reset timeout period, indicated by the 'D3' suffix in its part number per Maxim's Reset Timeout Period Suffix Guide. This timeout begins when all monitored supplies (VCC1, VCC2, RSTIN) rise above their respective thresholds and continues regardless of subsequent supply fluctuations until completion. The 210ms duration ensures reliable processor and peripheral initialization in demanding embedded applications.

How does the RSTIN input function on MAX6724UTSVD3-T, and what voltage range can it monitor?

The RSTIN input on MAX6724UTSVD3-T is a high-impedance comparator input referenced to a precise 626.5mV internal bandgap. By connecting an external resistor divider between the target supply and ground, users can monitor voltages from 0.62V up to the supply rails. For example, a 1.8V rail can be scaled to 626.5mV using R1/R2 = 1.87, enabling accurate undervoltage detection without trimming components - a core capability of the MAX6724UTSVD3-T.

What package type and pin count does MAX6724UTSVD3-T use?

MAX6724UTSVD3-T is packaged in a 6-pin SOT23-6 case (2.9mm × 1.6mm × 1.1mm), consistent with Maxim's standard ultra-small outline transistor footprint. This package supports reflow soldering, provides adequate thermal dissipation for industrial temperature operation (-40°C to +85°C), and enables high-density PCB layouts in space-constrained applications such as portable medical devices and telecom modules.