Analog Devices Inc./Maxim Integrated MAX6724UTRVD3+

Overview

MAX6724UTRVD3+ 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 RSTIN (adjustable down to 0.626V) with 210ms min reset timeout, push-pull active-low RST output, manual reset input, and watchdog timer - used in telecom power sequencing and battery-backed embedded systems.

For engineers reviewing the MAX6724UTRVD3+ datasheet, MAX6724UTRVD3+ pinout, MAX6724UTRVD3+ application, or MAX6724UTRVD3+ equivalent, key selection criteria include dual-supply threshold accuracy (±1.5% over temp), guaranteed reset validity down to VCC1/VCC2 = 0.8V, 14µA typical supply current at 3.6V, and integrated 35s/1.12s dual-mode watchdog timing.

Technical Context

The MAX6724UTRVD3+ implements independent voltage comparators for VCC1 and VCC2 with factory-trimmed thresholds (4.625V and 3.075V), plus an adjustable RSTIN comparator referenced to a 626.5mV internal bandgap. Reset assertion occurs on any undervoltage condition and persists for a minimum 210ms timeout after all monitored voltages recover.

It integrates a dual-mode watchdog timer: 35s minimum startup period after reset, followed by 1.12s minimum normal timeout upon first WDI transition; MR input features 50kΩ internal pullup and 1µs minimum pulse width support; all reset outputs are push-pull active-low referenced to VCC1.

Key Specifications

Pinout & Package

MAX6724UTRVD3+ uses a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), surface-mount, lead-free, RoHS-compliant. Pin 1 marked via dot; pin 6 is VCC1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6724UTRVD3+, MAX6720UTRVD3+ offers identical supervision logic but mandates external pullup for reset signaling, while TPS3808G33DBVR reduces feature set and quiescent current but omits RSTIN and watchdog - making MAX6724UTRVD3+ the only option supporting full triple-voltage, push-pull, and watchdog functionality in SOT23-6.

Availability

MAX6724UTRVD3+ is available at Aetrix Electronics and suitable for telecom power sequencing, battery-backed embedded systems, industrial PLC I/O modules, and network router management ASICs requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6724UTRVD3+ 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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.

The MAX6715–MAX6729 family delivers compact, ultra-low-power supervisory solutions for multivoltage systems where space, reliability, and accurate threshold monitoring are critical - especially in battery-operated and telecom infrastructure equipment.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6724UTRVD3+?

The MAX6724UTRVD3+ has factory-trimmed reset thresholds of 4.625V for VCC1 and 3.075V for VCC2, with ±1.5% tolerance over the full -40°C to +85°C operating temperature range. These values are encoded in the "RV" suffix per Maxim's Reset Voltage Threshold Suffix Guide and are verified in the Electrical Characteristics table of the official datasheet.

Does the MAX6724UTRVD3+ support monitoring a third voltage, and how is it configured?

Yes, the MAX6724UTRVD3+ supports third-voltage monitoring via the RSTIN pin, which compares the applied voltage against a precise 626.5mV internal reference. A resistor-divider network (e.g., R1/R2 from V_EXT to GND, with RSTIN at the junction) sets the trip point using V_{EXT_TH} = 626.5mV × (R1 + R2)/R2. The MAX6724UTRVD3+ datasheet Figure 1 shows this configuration.

What are the watchdog timeout periods supported by the MAX6724UTRVD3+?

The MAX6724UTRVD3+ implements a dual-mode watchdog: a 35-second minimum startup timeout after any reset event (power-up, MR, or watchdog-triggered), followed by a 1.12-second minimum normal timeout after the first valid WDI transition. This architecture ensures safe boot completion before enforcing strict activity monitoring - a key behavior confirmed in the Watchdog Input section of the MAX6724UTRVD3+ datasheet.

Is the reset output of the MAX6724UTRVD3+ push-pull or open-drain, and what are its drive capabilities?

The MAX6724UTRVD3+ features a push-pull active-low RST output referenced to VCC1. It can sink up to 3.2mA when VCC1 ≥ 4.5V (V_OL ≤ 0.4V), and sources current when deasserted (V_OH ≥ 0.8 × VCC1). This eliminates the need for an external pullup resistor and allows direct interfacing with most microprocessor reset inputs - a specification explicitly stated in the Pin Description and RESET OUTPUTS sections of the MAX6724UTRVD3+ datasheet.

Can the MAX6724UTRVD3+ operate reliably when VCC1 or VCC2 drops below 1.0V?

Yes, the MAX6724UTRVD3+ guarantees correct reset output logic state down to VCC1 or VCC2 = 0.8V, as specified in the Absolute Maximum Ratings and Detailed Description sections. This ensures fail-safe reset assertion during deep brownout conditions - a critical capability validated across temperature and process corners, and distinct from many competing supervisors that require ≥1.2V for valid operation.