Analog Devices Inc./Maxim Integrated MAX6355RVUT

Overview

The MAX6355RVUT from Maxim Integrated is a triple-voltage microprocessor supervisory circuit with active-low open-drain reset output, 2.63V VCC1 threshold, 1.58V VCC2 threshold, and adjustable third-voltage monitoring via RSTIN (1.22V reference). It operates over –40°C to +85°C in a 6-pin SOT23 package and supports systems requiring independent monitoring of three supply rails-e.g., dual-core SoCs with I/O, core, and auxiliary voltage domains.

For engineers reviewing the MAX6355RVUT datasheet, MAX6355RVUT pinout, MAX6355RVUT application, or MAX6355RVUT equivalent, key selection criteria include its open-drain RST output, guaranteed RESET validity down to VCC1 ≥ 1.0V or VCC2 ≥ 1.0V, 20µA quiescent current, 100ms minimum reset timeout, and support for external resistive divider-based third-voltage threshold setting.

Technical Context

The MAX6355RVUT implements dual-supply monitoring (VCC1/VCC2) plus a dedicated undervoltage-reset comparator input (RSTIN) referenced to VCC1, enabling precise third-rail supervision using an external resistor divider. Its reset logic asserts RST low if any monitored rail falls below its factory-set threshold or if RSTIN drops below 1.22V.

It features a debounced TTL/CMOS-compatible manual-reset input (MR), guarantees valid reset output as long as either VCC1 or VCC2 remains ≥1.0V, and provides power-supply transient immunity up to 250µs at 100mV overdrive-critical for noisy industrial power environments.

Key Specifications

Pinout & Package

MAX6355RVUT is housed in a 6-pin SOT23 package (U6-1 outline, land pattern 90-0175), with exposed pad not connected. Pin 1 is RST (active-low open-drain), Pin 2 is GND, Pin 3 is MR (manual reset input), Pin 4 is VCC2, Pin 5 is RSTIN (adjustable comparator input), and 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 MAX6355RVUT, MAX6356RVUT offers push-pull drive but loses open-drain flexibility, while TPS3808G33DBVR reduces feature count and cannot replace the RSTIN-based third-rail monitoring-making MAX6355RVUT uniquely suitable for compact, true triple-supply supervision.

Availability

MAX6355RVUT is available at Aetrix Electronics and suitable for industrial PLC I/O modules, medical diagnostic handhelds, automotive body control units, smart energy meters, and multivoltage embedded systems requiring stable component supply across extended temperature ranges.

Supply support for MAX6355RVUT 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.

The MAX6351–MAX6360 family delivers highly integrated microprocessor supervisory circuits optimized for reliability-critical multivoltage systems-emphasizing low power, wide temperature operation, and flexible reset architectures.

FAQ

What is the function of the RSTIN pin on the MAX6355RVUT?

The RSTIN pin on the MAX6355RVUT is an adjustable undervoltage-reset comparator input referenced to VCC1, with a precise 1.22V internal threshold. When used with an external resistive divider, it enables monitoring of a third supply rail-such as an ADC reference or sensor bias voltage-without requiring additional supervisory ICs. This feature is integral to the MAX6355RVUT's triple-voltage supervision capability and is confirmed in the device's pin description and detailed electrical characteristics.

Does the MAX6355RVUT provide watchdog timer functionality?

No, the MAX6355RVUT does not include a watchdog timer. Watchdog functionality is exclusive to the MAX6358/MAX6359/MAX6360 variants in the same family. The MAX6355RVUT is specifically configured for triple-voltage monitoring (VCC1, VCC2, and RSTIN) with an open-drain reset output and debounced manual reset input-confirmed by its ordering code, pin configuration (RSTIN on Pin 5), and absence of WDI pin or watchdog timing specifications in its datasheet section.

What are the exact voltage thresholds programmed into the MAX6355RVUT?

The MAX6355RVUT is factory-programmed with a VCC1 threshold of 2.63V (±30mV over –40°C to +85°C) and a VCC2 threshold of 1.58V (±30mV over –40°C to +85°C), as indicated by the "RV" suffix in its part number per the Voltage Threshold Levels table. These values are precision-trimmed and fully guaranteed across temperature, enabling accurate detection of brownout conditions on both primary and secondary supply rails.

Can the MAX6355RVUT operate with VCC1 and VCC2 supplied from different sources?

Yes, the MAX6355RVUT is explicitly designed to operate with VCC1 and VCC2 independently powered-e.g., from separate regulators or battery cells. Its internal architecture ensures valid reset output as long as either supply remains ≥1.0V, and its dual-threshold comparators function independently. This capability is confirmed in the Absolute Maximum Ratings, Electrical Characteristics, and Detailed Description sections of the MAX6355RVUT datasheet.

Is the MAX6355RVUT pin-compatible with other devices in the MAX6351–MAX6360 family?

The MAX6355RVUT shares the same 6-pin SOT23 package and pinout (RST, GND, MR, VCC2, RSTIN, VCC1) with MAX6356RVUT and MAX6357RVUT, but differs functionally: MAX6356RVUT has push-pull RST referenced to VCC1, and MAX6357RVUT has push-pull RST referenced to VCC2. While mechanical compatibility exists, electrical behavior-including output drive type and reference-varies, so direct substitution requires validation of reset interface requirements in the target design.