Analog Devices Inc./Maxim Integrated MAX6355RVUT+T

Overview

The MAX6355RVUT+T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit with open-drain active-low reset output, 2.63V VCC1 threshold, 1.58V VCC2 threshold, and adjustable third-voltage monitoring via RSTIN (1.22V internal reference). It operates over –40°C to +85°C in a 6-pin SOT23 package and supports systems requiring reliable power-on reset, manual reset debouncing, and undervoltage detection across three rails.

For engineers reviewing the MAX6355RVUT+T datasheet, MAX6355RVUT+T pinout, MAX6355RVUT+T application, or MAX6355RVUT+T equivalent, key selection criteria include its dual-supply monitoring capability, guaranteed RESET validity down to VCC1 = 1V or VCC2 = 1V, 100ms minimum reset pulse width, 20µA supply current, and compatibility with multivoltage embedded controllers and portable equipment.

Technical Context

The MAX6355RVUT+T monitors three voltage rails: VCC1 (2.63V threshold), VCC2 (1.58V threshold), and a third via RSTIN using an internal 1.22V comparator reference. Reset assertion occurs if any monitored rail falls below its trip point, and the open-drain RST output remains valid as long as either VCC1 or VCC2 exceeds +1.0V.

It features a debounced TTL/CMOS-compatible manual-reset input (MR), no watchdog timer (distinguishing it from MAX6358–MAX6360), and supports external resistive divider configuration for RSTIN to monitor voltages above 1.22V. The device uses BiCMOS process technology and guarantees operation across the full industrial temperature range.

Key Specifications

Pinout & Package

MAX6355RVUT+T is housed in a RoHS-compliant 6-pin SOT23 package (U6-1 outline, land pattern 90-0175), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and thermal pad not present. Pin 1 is RST (open-drain active-low reset output); Pin 2 is GND; Pin 3 is MR (manual-reset input); Pin 4 is VCC2; Pin 5 is RSTIN (adjustable third-voltage monitor input); 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 MAX6356RVUT+T, MAX6355RVUT+T offers open-drain flexibility for multi-load or level-shifted reset buses; versus TPS3808G33DBVR, it uniquely provides integrated third-voltage supervision-making it the only drop-in solution for compact triple-rail systems requiring <20µA operation and industrial temperature support.

Availability

MAX6355RVUT+T is available at Aetrix Electronics and suitable for computers, portable/battery-powered equipment, controllers, and intelligent instruments requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MAX6355RVUT+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, mixed-signal, and high-reliability semiconductor solutions for industrial, computing, and communications markets.

The MAX6351–MAX6360 product line delivers multivoltage microprocessor supervision with factory-trimmed thresholds, low IQ, and robust transient immunity-targeting embedded systems where power integrity and deterministic reset timing are mission-critical.

FAQ

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

The RSTIN pin on the MAX6355RVUT+T provides an adjustable third-voltage monitoring input with a precise 1.22V internal comparator reference. When used with an external resistive divider, it enables supervision of voltages higher than 1.22V-such as 3.3V or 5V rails-without adding extra components. This feature makes MAX6355RVUT+T uniquely capable of triple-rail supervision in a single 6-pin SOT23 package.

Does the MAX6355RVUT+T include a watchdog timer?

No, the MAX6355RVUT+T does not include a watchdog timer. Watchdog functionality is exclusive to the MAX6358, MAX6359, and MAX6360 variants in the same family. The MAX6355RVUT+T is specifically designed for triple-voltage supervision with manual reset and RSTIN-based third-rail monitoring-offering simplicity, low quiescent current (20µA), and deterministic reset behavior without watchdog complexity.

What are the exact voltage thresholds for the MAX6355RVUT+T?

The MAX6355RVUT+T has a VCC1 threshold of 2.63V (±0.05V at +25°C) and a VCC2 threshold of 1.58V (±0.03V at +25°C), both factory-trimmed and guaranteed over –40°C to +85°C. Its RSTIN pin uses a fixed 1.22V internal comparator reference, enabling precise third-rail monitoring when paired with an external resistor divider per the formula V_EXT = 1.22V × (R1 + R2)/R2.

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

Yes, the MAX6355RVUT+T shares the same 6-pin SOT23 (U6-1) package and pinout as MAX6356RVUT+T, MAX6357RVUT+T, MAX6358RVUT+T, MAX6359RVUT+T, and MAX6360RVUT+T. Pin 1 is RST (open-drain for MAX6355RVUT+T), Pin 5 is RSTIN (not WDI or RST2), and Pin 6 is VCC1-enabling board-level substitution within the same suffix group when functional alignment is verified.

What is the minimum supply voltage required for valid RESET assertion on the MAX6355RVUT+T?

The MAX6355RVUT+T guarantees valid RESET output as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V-enabling reliable brownout detection far below nominal operating rails. This specification is fully tested and guaranteed over the entire –40°C to +85°C temperature range, making MAX6355RVUT+T suitable for applications where deep supply sags must trigger controlled system shutdown or reset.