Analog Devices Inc./Maxim Integrated MAX6724UTVDD3+

Overview

MAX6724UTVDD3+ from Maxim Integrated is a triple-voltage microprocessor supervisory circuit in 6-pin SOT23 package, monitoring VCC1 (4.625V threshold), VCC2 (3.075V threshold), and an externally adjustable RSTIN input (626mV reference). It provides push-pull active-low reset output with 210ms minimum timeout, manual reset input, and watchdog timer support. Designed for multivoltage embedded systems requiring reliable power-up sequencing and brownout protection.

For engineers reviewing the MAX6724UTVDD3+ datasheet, MAX6724UTVDD3+ pinout, MAX6724UTVDD3+ application, or MAX6724UTVDD3+ equivalent, this page delivers verified functional identity, exact reset thresholds, confirmed watchdog timing behavior, validated pin roles, and real-world substitution guidance - all aligned to Maxim's official specifications for the precise suffix "VDD3".

Technical Context

The MAX6724UTVDD3+ implements dual independent voltage comparators for VCC1 and VCC2 plus a dedicated high-impedance RSTIN comparator referenced to a 626.5mV internal bandgap. Its reset logic asserts RST low when any monitored supply falls below its factory-trimmed threshold and holds for a guaranteed 210ms (min) after all supplies recover.

This device integrates a dual-mode watchdog timer: 35s (min) startup period after reset, followed by 1.12s (min) normal timeout upon first WDI edge detection. The push-pull RST output is referenced to VCC1 and remains valid down to VCC1 or VCC2 = 0.8V, with immunity to sub-20µs VCC transients.

Key Specifications

Pinout & Package

MAX6724UTVDD3+ uses a 6-pin SOT23-6 package (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm body, with gull-wing leads and lead-free +T suffix indicating RoHS-compliant termination.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6724UTVDD3+, MAX6720UTVD3+ offers identical timing and thresholds but requires external biasing for RST, while TPS3808G33DBVR reduces system complexity in dual-rail designs but forfeits the critical third-monitoring channel required for advanced power sequencing.

Availability

MAX6724UTVDD3+ is available at Aetrix Electronics and suitable for industrial PLC controllers, network router power management, medical patient monitors, and automotive infotainment head units requiring stable component supply, long-lifecycle assurance, and guaranteed reset behavior under brownout conditions.

Supply support for MAX6724UTVDD3+ 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 high-performance analog, mixed-signal, and power management ICs for industrial, computing, and communications markets.

The MAX6715–MAX6729 family was designed specifically for compact, multivoltage embedded systems needing reliable power-on reset, brownout detection, and watchdog supervision in space-constrained SOT23 packages.

FAQ

What is the exact reset threshold voltage for VCC1 on the MAX6724UTVDD3+?

The MAX6724UTVDD3+ has a factory-trimmed VCC1 reset threshold of 4.625V (falling edge), with tolerance of ±125mV (4.500V to 4.750V) across temperature and process variation. This value is encoded in the "VD" suffix per Maxim's Reset Voltage Threshold Suffix Guide and is confirmed in the Electrical Characteristics table on page 2 of the datasheet.

Does the MAX6724UTVDD3+ support monitoring a third supply voltage, and how is it configured?

Yes, the MAX6724UTVDD3+ supports third-supply monitoring via the RSTIN pin, which compares the applied voltage against a 626.5mV internal reference. To monitor a higher voltage (e.g., 12V), connect an external resistor divider such that V_EXT × R2/(R1 + R2) = 626.5mV. The MAX6724UTVDD3+ datasheet Figure 1 shows the standard configuration and confirms RSTIN's 25nA max input current enables high-resistance dividers for minimal power draw.

What is the function of the "D3" suffix in MAX6724UTVDD3+?

The "D3" suffix in MAX6724UTVDD3+ specifies a minimum reset timeout period of 210ms, per Maxim's Reset Timeout Period Suffix Guide. This value is guaranteed over -40°C to +85°C and defines the minimum duration RST remains asserted after all monitored supplies recover - critical for ensuring µP boot completion before release.

Is the reset output of MAX6724UTVDD3+ push-pull or open-drain, and what are its drive capabilities?

The MAX6724UTVDD3+ features a push-pull active-low RST output referenced to VCC1. Per datasheet page 4, it guarantees VOL ≤ 0.4V at ISINK = 3.2mA (VCC1 ≥ 4.5V) and VOH ≥ 0.8 × VCC1 at ISOURCE = 800µA. This eliminates need for external pullup resistors and allows direct connection to most µP reset pins.

How does the watchdog timer operate on the MAX6724UTVDD3+, and what are its timing modes?

The MAX6724UTVDD3+ implements a dual-mode watchdog: a 35s (min) startup period after any reset event (power-up, MR, or timeout), followed by a 1.12s (min) normal timeout after the first valid WDI edge. This architecture prevents false timeouts during boot while enabling rapid hang detection during runtime - both timings are production-tested and specified in the Electrical Characteristics table.