Analog Devices Inc./Maxim Integrated MAX6724UTSYD3+T

Overview

MAX6724UTSYD3+T from Maxim Integrated is a triple-voltage microprocessor supervisory IC monitoring VCC1 (primary), VCC2 (secondary), and RSTIN (auxiliary) with factory-trimmed thresholds of 3.075V (VTH1), 2.925V (VTH2), and 626.5mV reference for RSTIN. It provides push-pull active-low reset output, manual reset input, and watchdog timer with 35s startup / 1.12s normal timeout. Used in multivoltage embedded systems requiring reliable power sequencing and brownout detection.

For engineers reviewing the MAX6724UTSYD3+T datasheet, MAX6724UTSYD3+T pinout, MAX6724UTSYD3+T application, or MAX6724UTSYD3+T equivalent, key selection criteria include dual-supply monitoring range (1.8–5.0V / 0.9–3.3V), guaranteed reset validity down to VCC = 0.8V, 14µA typical supply current at 3.6V, and SOT23-6 package compatibility with space-constrained PCB layouts.

Technical Context

The MAX6724UTSYD3+T implements a triple-threshold supervision architecture: two factory-set voltage comparators for VCC1 and VCC2, plus an externally adjustable RSTIN input referenced to a 626.5mV internal bandgap. Reset assertion occurs when any monitored rail falls below its threshold, MR is pulled low, or WDI fails to toggle within 1.12s after initial boot.

Its watchdog features dual-mode timing-35s minimum startup period post-reset followed by 1.12s normal timeout-with glitch-immune WDI edge detection. The push-pull RST output is referenced to VCC1 and guarantees VOL ≤ 0.4V at ISINK = 3.2mA, enabling direct interface with 1.8V–5V logic families without external pullups.

Key Specifications

Pinout & Package

MAX6724UTSYD3+T is housed in a 6-pin SOT23-6 package with 1.6mm × 2.9mm footprint and 0.95mm height, optimized for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6724UTSYD3+T, MAX6720UTSYD3+T lacks RSTIN and WDI-making it unsuitable for systems requiring third-rail monitoring or software hang detection-while TPS3808G33DBVR offers lower ICC but cannot supervise multiple independent rails, limiting use to single-supply architectures.

Availability

MAX6724UTSYD3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, network router power management, battery-powered medical sensor hubs, and set-top box mainboards requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6724UTSYD3+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 industrial, communications, and computing markets, emphasizing reliability, integration, and low-power operation.

The MAX6715–MAX6729 family delivers compact, ultra-low-voltage supervisory solutions targeting multirail embedded systems where board space, power budget, and robust power-fail response are critical design constraints.

FAQ

What voltage rails does the MAX6724UTSYD3+T monitor?

The MAX6724UTSYD3+T monitors three voltage rails: VCC1 (primary supply, 1.8–5.0V), VCC2 (secondary supply, 0.9–3.3V), and RSTIN (auxiliary supply, adjustable down to 0.62V using an external resistor divider). Its factory-trimmed thresholds are 3.075V for VCC1 and 2.925V for VCC2, with a 626.5mV internal reference for RSTIN-enabling precise supervision of 3.3V, 3.0V, and custom auxiliary rails in a single SOT23-6 package.

Does the MAX6724UTSYD3+T include a watchdog timer?

Yes, the MAX6724UTSYD3+T integrates a dual-mode watchdog timer with a 35s minimum startup period after reset and a 1.12s minimum normal timeout period. The WDI pin accepts rising or falling edges to reset the timer; failure to toggle within the timeout asserts the RST output for 210ms. This architecture prevents false resets during boot while ensuring rapid detection of hung firmware during runtime-making MAX6724UTSYD3+T suitable for safety-critical embedded applications.

What is the reset output type and drive capability of the MAX6724UTSYD3+T?

The MAX6724UTSYD3+T features a push-pull active-low RST output referenced to VCC1. It guarantees VOL ≤ 0.4V at ISINK = 3.2mA and VOH ≥ 0.8 × VCC1 at ISOURCE = 800µA, enabling direct connection to 1.8V–5V logic without external pullup resistors. This eliminates layout complexity and improves noise immunity compared to open-drain alternatives-critical for high-reliability industrial and telecom systems using MAX6724UTSYD3+T.

How does the MAX6724UTSYD3+T ensure valid reset operation during brownout conditions?

The MAX6724UTSYD3+T guarantees correct reset logic state down to VCC1 or VCC2 = 0.8V-far below typical microprocessor operating voltages. This ensures deterministic reset assertion during gradual supply collapse, preventing undefined processor behavior. Combined with 20ppm/°C reset threshold tempco and 0.5% hysteresis, MAX6724UTSYD3+T delivers robust brownout protection in automotive and industrial environments where supply instability is common.

What package and pin count does the MAX6724UTSYD3+T use?

The MAX6724UTSYD3+T is supplied in a 6-pin SOT23-6 package (1.6mm × 2.9mm, 0.95mm height) with standard lead-free +T marking. Its pinout includes VCC1, VCC2, GND, RST (push-pull), MR, and WDI-supporting triple-supply monitoring, manual reset, and watchdog functionality in the smallest possible footprint. This package is compatible with automated SMT assembly and meets IPC/JEDEC standards for industrial reflow profiles.