Analog Devices Inc./Maxim Integrated MAX6351RVUT+T

Overview

The MAX6351RVUT+T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with two active-low push-pull reset outputs-one referenced to VCC1 (2.63V threshold) and one to VCC2 (1.58V threshold)-designed for multivoltage embedded systems requiring precise, independent supply monitoring. It operates from -40°C to +85°C, draws only 20µA, and guarantees valid RESET output as long as either VCC1 or VCC2 remains ≥1.0V. Used in portable battery-powered equipment and intelligent instruments where reliable power sequencing and fault detection are critical.

For engineers reviewing the MAX6351RVUT+T datasheet, MAX6351RVUT+T pinout, MAX6351RVUT+T application, or MAX6351RVUT+T equivalent, key selection factors include dual independent reset thresholds (2.63V/1.58V), 6-pin SOT23 package, guaranteed operation down to 1.0V on either supply, 100ms minimum reset pulse width, and absence of watchdog or third-voltage monitor functionality in this variant.

Technical Context

The MAX6351RVUT+T implements dual independent voltage comparators with factory-trimmed thresholds (VTH1 = 2.63V ±0.05V, VTH2 = 1.58V ±0.05V at +25°C) and built-in hysteresis (~2.5mV typical). Its reset logic asserts both RST1 and RST2 low whenever either VCC1 drops below VTH1 or VCC2 drops below VTH2, with no internal delay between fault detection and output assertion beyond propagation delay (≤0.1µs).

It features debounced TTL/CMOS-compatible manual-reset input (MR), push-pull outputs capable of sinking 1.2mA at VCC ≥2.7V (VOL ≤0.3V), and full temperature guarantee across -40°C to +85°C. Unlike MAX6358–MAX6360 variants, it lacks watchdog timer circuitry; unlike MAX6355–MAX6357, it has no RSTIN third-voltage monitor input.

Key Specifications

Pinout & Package

MAX6351RVUT+T is housed in a RoHS-compliant 6-pin SOT23 package (U6-1 outline, 90-0175 land pattern), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and thermal pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6351RVUT+T, MAX6353RVUK+T reduces footprint but sacrifices independent VCC2 monitoring, while TPS3808G33DBVR offers lower unit cost but requires redesign to accommodate open-drain topology and single-threshold limitation-neither provides drop-in replacement capability.

Availability

MAX6351RVUT+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart energy meters, and automotive body control units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6351RVUT+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, computing, and consumer applications, emphasizing high reliability and low power.

The MAX6351–MAX6360 family delivers integrated dual- and triple-voltage supervision for multirail embedded systems, targeting applications where discrete solutions increase board area, BOM complexity, and failure risk.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6351RVUT+T?

The MAX6351RVUT+T has factory-trimmed thresholds of 2.63V ±0.05V for VCC1 and 1.58V ±0.05V for VCC2 at +25°C, with guaranteed performance across -40°C to +85°C. These values correspond to the "RV" suffix per Maxim's Voltage Threshold Levels table and are confirmed in the Electrical Characteristics section of the official datasheet.

Does the MAX6351RVUT+T include a watchdog timer function?

No, the MAX6351RVUT+T does not include a watchdog timer. Watchdog functionality is exclusive to MAX6358–MAX6360 variants (e.g., MAX6359RVUT+T). The MAX6351RVUT+T is a dual-voltage supervisor only, with no WDI pin or associated timeout circuitry-its pin 5 is RST2, not WDI.

Can the MAX6351RVUT+T operate with supply voltages below 2.0V?

Yes, the MAX6351RVUT+T guarantees valid reset operation as long as either VCC1 ≥1.0V or VCC2 ≥1.0V. While specified operating range starts at 1.2V over temperature, the device maintains correct RST1/RST2 logic states down to 1.0V on either rail-enabling robust brownout response in ultra-low-voltage systems.

What is the package type and lead finish for MAX6351RVUT+T?

The MAX6351RVUT+T uses a 6-pin SOT23 package (U6-1 outline) with lead(Pb)-free finish, indicated by the "+T" suffix. It complies with RoHS Directive 2011/65/EU and has a moisture sensitivity level (MSL) of 1, suitable for standard reflow soldering processes without dry-pack requirements.

Is the MAX6351RVUT+T pin-compatible with other devices in the MAX6351–MAX6360 family?

The MAX6351RVUT+T shares the same 6-pin SOT23 pinout as all MAX6351, MAX6355–MAX6360 variants, including identical pin assignments for VCC1, VCC2, GND, MR, RST1, and RST2. However, pin functions differ across subfamily members-for example, pin 5 is RST2 on MAX6351RVUT+T but RSTIN on MAX6355 or WDI on MAX6358-so electrical compatibility must be verified per application.