Analog Devices Inc./Maxim Integrated MAX6724UTRVD3

Overview

MAX6724UTRVD3 from Maxim Integrated is a dual-voltage microprocessor supervisory IC monitoring VCC1 (primary) and VCC2 (secondary) supply rails with factory-trimmed reset thresholds, 210ms minimum reset timeout, push-pull active-low RST output, and integrated watchdog timer. It guarantees valid reset assertion down to VCC1 or VCC2 = 0.8V and draws only 14µA typical supply current at 3.6V. Used in telecom power management systems requiring reliable brownout detection and system-level reset coordination.

For engineers reviewing the MAX6724UTRVD3 datasheet, MAX6724UTRVD3 pinout, MAX6724UTRVD3 application, or MAX6724UTRVD3 equivalent, this page delivers verified electrical parameters, exact SOT23-6 pin mapping, confirmed watchdog startup behavior (35s min initial period), real-world reset threshold tolerances (±125mV), and validated alternative parts for dual-supply supervision in automotive-grade industrial designs.

Technical Context

The MAX6724UTRVD3 implements dual independent voltage comparators with internal 0.8V reference circuitry enabling guaranteed reset validity at ultra-low supply voltages. Its watchdog timer features dual-mode operation: a 35s minimum startup period followed by 1.12s minimum normal timeout, triggered by WDI edge transitions.

Reset logic uses an internal timeout counter that restarts upon any monitored voltage falling below threshold during the active reset window. The push-pull RST output is referenced to VCC1 and drives high at 0.8×VCC1 when deasserted, with VOL ≤ 0.3V at ISINK = 1.2mA (VCC1 ≥ 2.7V).

Key Specifications

Pinout & Package

MAX6724UTRVD3 is housed in a RoHS-compliant 6-pin SOT23 package (3.0mm × 1.7mm × 1.3mm), rated for surface-mount reflow assembly and operating up to +125°C junction temperature.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-supply supervision applications.

Compared with MAX6724UTRVD3, MAX6723UTRVD3 requires external biasing but supports reset bus sharing, while TPS3808G33DBVR offers lower quiescent current but cannot supervise two independent rails or provide watchdog functionality - making MAX6724UTRVD3 the sole choice for robust dual-supply safety-critical systems.

Availability

MAX6724UTRVD3 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and automotive ADAS applications requiring stable component supply across extended temperature ranges and long production lifecycles.

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 and mixed-signal ICs for demanding industrial, automotive, and communications applications, emphasizing reliability, low power, and high integration.

The MAX6715A–MAX6729A family delivers ultra-low-voltage microprocessor supervision with dual/triple supply monitoring, watchdog timers, and AEC-Q100 qualification - targeting fault-tolerant embedded systems where power integrity is mission-critical.

FAQ

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

The MAX6724UTRVD3 uses the 'S' suffix indicating a nominal 2.925V reset threshold for both VCC1 and VCC2, with guaranteed limits of 2.850V (min) and 3.000V (max) per the Electrical Characteristics table. This symmetric dual-threshold configuration ensures coordinated reset assertion when either rail falls below 2.850V, critical for systems with tightly coupled power domains. The threshold exhibits ±20ppm/°C tempco and 0.5% hysteresis relative to typical value.

Does MAX6724UTRVD3 support watchdog functionality, and what are its timing characteristics?

Yes, MAX6724UTRVD3 includes a dual-mode watchdog timer with a 35s minimum startup period after each reset event and a 1.12s minimum normal timeout period. The watchdog triggers reset if WDI remains static beyond these intervals, and clears on any rising or falling edge. The WDI pin has CMOS-compatible thresholds (0.3×VCC1/0.7×VCC1) and draws <1µA, allowing direct connection to microcontroller GPIO without buffering. Watchdog disable is achieved by leaving WDI unconnected.

What package type and pin count does MAX6724UTRVD3 use, and is it RoHS-compliant?

MAX6724UTRVD3 is supplied in a lead(Pb)-free, RoHS-compliant 6-pin SOT23 package (3.0mm × 1.7mm footprint). Pinout follows standard SOT23 orientation with VCC1 on pin 5, GND on pin 2, and push-pull RST on pin 1. The device is qualified for reflow soldering per JEDEC J-STD-020 and supports operating temperatures from -40°C to +125°C, meeting automotive and industrial reliability requirements.

How does MAX6724UTRVD3 handle manual reset activation, and what is the MR pin's electrical behavior?

The MR pin on MAX6724UTRVD3 is an active-low manual-reset input with a 50kΩ internal pullup to VCC1. Pulling MR below 0.3×VCC1 for ≥1µs asserts reset for the full 210ms timeout period, even if MR returns high earlier. Glitch rejection is 100ns, and the pin accepts CMOS logic levels. When unused, MR may be left floating (relying on internal pullup) or tied to VCC1; no external components are required for basic operation.

What is the supply current consumption of MAX6724UTRVD3 across its operating voltage and temperature range?

MAX6724UTRVD3 draws 14µA typical supply current at 3.6V and +25°C, with maximum values of 39µA (VCC1 < 5.5V) and 28µA (VCC1 < 3.6V) across -40°C to +125°C. Current splits between ICC1 (VCC1 path) and ICC2 (VCC2 path), with ICC2 contributing 3–11µA depending on VCC2 voltage. This ultra-low quiescent current enables multi-year battery operation in always-on monitoring applications without compromising reset accuracy.