Analog Devices Inc./Maxim Integrated MAX6356UVUT-T

Overview

The MAX6356UVUT-T from Maxim Integrated is a triple-voltage microprocessor supervisory circuit with active-low push-pull reset output referenced to VCC1, 2.78V/1.58V dual supply thresholds, and integrated RSTIN input for monitoring a third voltage at 1.22V. It operates from -40°C to +85°C in a 6-pin SOT23 package and supports multivoltage embedded systems requiring precise power-up sequencing and fault detection.

For engineers reviewing the MAX6356UVUT-T datasheet, MAX6356UVUT-T pinout, MAX6356UVUT-T application, or MAX6356UVUT-T equivalent, key selection criteria include its dual-threshold precision (±0.05V over temperature), 20µA quiescent current, guaranteed RESET validity down to VCC1 = 1.2V or VCC2 = 1.2V, and RSTIN comparator for configurable third-voltage monitoring.

Technical Context

This device implements a dual-supply monitoring architecture where reset assertion occurs if either VCC1 drops below 2.78V or VCC2 falls below 1.58V, with hysteresis of 2.5mV on the RSTIN input. The internal reset generator guarantees a minimum 100ms pulse width and maintains valid logic states as long as at least one supply remains ≥1.2V.

The RSTIN input accepts an external resistive divider to scale higher voltages down to its fixed 1.22V threshold, enabling flexible third-rail monitoring without external comparators. All timing parameters-including reset delay (20µs), supply transient immunity, and temperature-stable thresholds (20ppm/°C)-are fully specified across the extended industrial temperature range.

Key Specifications

Pinout & Package

MAX6356UVUT-T is housed in a 6-pin SOT23 package (U6-1 outline) with 0.95mm pitch, compatible with standard reflow profiles and automated assembly. Pin 1 is RST (active-low push-pull output referenced to VCC1), Pin 2 is GND, Pin 3 is MR (debounced manual-reset input), Pin 4 is VCC2, Pin 5 is RSTIN (third-voltage monitor 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 MAX6356UVUT-T, MAX6355UVUT-T offers identical monitoring capability but requires external pull-up due to open-drain output, while TPS3808G33DBVR provides lower-cost single-rail supervision but cannot replicate the dual-threshold plus RSTIN functionality without adding discrete components.

Availability

MAX6356UVUT-T is available at Aetrix Electronics and suitable for computers, portable/battery-powered equipment, intelligent instruments, and multivoltage systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6356UVUT-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 is a semiconductor company specializing in analog and mixed-signal ICs for power management, sensing, and interface applications.

The MAX6351–MAX6360 product line delivers precision multivoltage supervision for embedded systems where simultaneous monitoring of multiple rails and deterministic reset timing are critical to system reliability.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6356UVUT-T?

The MAX6356UVUT-T has a factory-set VCC1 threshold of 2.78V (±0.05V over temperature) and a VCC2 threshold of 1.58V (±0.05V over temperature). These values are laser-trimmed during production and guaranteed across the full -40°C to +85°C operating range, enabling precise power-fail detection without external calibration.

Does the MAX6356UVUT-T support monitoring of a third voltage, and how is it implemented?

Yes, the MAX6356UVUT-T supports third-voltage monitoring via its RSTIN pin, which features an internal 1.22V comparator. To monitor a higher voltage (e.g., 3.3V or 5V), connect an external resistive divider between the target rail and RSTIN, sized so the divided voltage equals 1.22V at the trip point. The RSTIN input draws only ±25nA, minimizing loading effects.

What type of reset output does the MAX6356UVUT-T provide, and what are its drive capabilities?

The MAX6356UVUT-T provides an active-low push-pull reset output (RST) referenced to VCC1. It can sink 1.2mA at VCC1 ≥2.7V (VOL ≤0.3V) and source 350µA at VCC1 > VTH1(MAX) (VOH ≥0.8 × VCC1). This eliminates the need for external pull-up resistors and ensures fast, rail-to-rail logic transitions.

How does the MAX6356UVUT-T behave when one supply drops below its threshold while the other remains valid?

When either VCC1 drops below 2.78V or VCC2 drops below 1.58V, the MAX6356UVUT-T immediately asserts its active-low RST output. Crucially, the reset remains valid as long as at least one supply stays ≥1.2V-ensuring reliable reset generation even during asymmetric brownout conditions common in multirail systems.

Is the MAX6356UVUT-T compatible with lead-free soldering processes?

Yes, the MAX6356UVUT-T is offered in lead(Pb)-free packaging. The "-T" suffix denotes RoHS-compliant, lead-free construction per JEDEC J-STD-020 moisture sensitivity level 1 specifications. It supports standard reflow profiles up to 260°C peak temperature and is qualified for automated assembly without special handling requirements.