Analog Devices Inc./Maxim Integrated MAX6356UVUT

Overview

The MAX6356UVUT from Maxim Integrated is a triple-voltage microprocessor supervisory circuit with active-low push-pull reset referenced to VCC1, 2.78V/1.58V dual supply thresholds, and an adjustable third-voltage monitor input (RSTIN) with 1.22V internal reference-designed for reliable power-up sequencing and fault detection in multivoltage embedded systems.

For engineers reviewing the MAX6356UVUT datasheet, MAX6356UVUT pinout, MAX6356UVUT application, or MAX6356UVUT equivalent, this device supports precise undervoltage monitoring of three rails-including configurable third-rail sensing via external resistor divider-while maintaining guaranteed RESET validity down to VCC1 = 1.0V or VCC2 = 1.0V.

Technical Context

The MAX6356UVUT integrates two precision voltage comparators for VCC1 (2.78V threshold) and VCC2 (1.58V threshold), plus a dedicated RSTIN input with 1.22V ±3mV internal reference for monitoring a third voltage via external resistive divider. Its reset generator asserts active-low RST when any monitored supply falls below its trip point.

It features a debounced TTL/CMOS-compatible manual-reset input (MR), operates over –40°C to +85°C, draws only 20µA typical supply current, and guarantees 100ms minimum reset pulse width. The device uses BiCMOS process and is fully specified across temperature without derating.

Key Specifications

Pinout & Package

MAX6356UVUT is housed in a 6-pin SOT23 package (U6-1 outline), surface-mount compatible with standard 0.95mm pitch footprint (land pattern 90-0175), RoHS-compliant, and rated for industrial temperature operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6356UT-T, the MAX6356UVUT offers identical supervision functionality but with updated tape-and-reel packaging designation; versus TPS3808G33DBVR, it provides essential dual-threshold and RSTIN flexibility required for multivoltage system reliability-making it irreplaceable in designs needing three-rail coordination.

Availability

MAX6356UVUT is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld diagnostics, automotive body control modules, smart energy meters, and multivoltage embedded systems requiring stable component supply and long-term lifecycle support.

Supply support for MAX6356UVUT 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 high-performance analog and mixed-signal ICs for industrial, automotive, communications, and computing markets.

The MAX6351–MAX6360 family delivers precision multivoltage supervision for complex embedded systems-specifically engineered to replace discrete reset solutions with integrated, low-power, temperature-stable monitoring of two or three supply rails.

FAQ

What is the exact reset threshold voltage for VCC1 on the MAX6356UVUT?

The MAX6356UVUT has a factory-set VCC1 threshold of 2.78V, with tolerance of ±0.08V at +25°C and ±0.15V over the full –40°C to +85°C operating range. This value is confirmed in the Voltage-Threshold Levels table and Electrical Characteristics section of the official datasheet, where "UV" suffix maps directly to 2.78V/1.58V dual thresholds. The MAX6356UVUT uses this precise trip point to assert RST when the primary supply falls below specification.

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

Yes, the MAX6356UVUT supports third-voltage monitoring via its RSTIN pin, which features an internal 1.22V ±3mV reference comparator. To monitor voltages above 1.22V (e.g., 3.3V or 5V), an external resistive divider scales the target voltage down to match the RSTIN threshold. The MAX6356UVUT's RSTIN input is powered from VCC1 and must remain ≤ VCC1. This eliminates need for separate supervisor ICs in multirail systems.

What is the reset output type and drive capability of the MAX6356UVUT?

The MAX6356UVUT 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). Unlike open-drain variants, this push-pull configuration eliminates need for external pull-up resistors-reducing component count and simplifying interface to microcontrollers in the MAX6356UVUT-based design.

Can the MAX6356UVUT operate reliably when one supply rail drops close to zero volts?

Yes-the MAX6356UVUT guarantees valid reset output as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V, per Absolute Maximum Ratings and Electrical Characteristics. This brownout resilience allows the MAX6356UVUT to maintain deterministic reset behavior during deep supply sags, enabling controlled shutdown sequences in battery-powered or unregulated systems where full rail collapse may occur.

Is the MAX6356UVUT pin-compatible with other devices in the MAX6351–MAX6360 family?

The MAX6356UVUT uses the 6-pin SOT23 (U6-1) package and shares identical pinout with MAX6355UT-T and MAX6357UT-T-specifically Pin 1=RST, Pin 2=GND, Pin 3=MR, Pin 4=VCC2, Pin 5=RSTIN, Pin 6=VCC1. However, it is not pin-compatible with 5-pin variants (e.g., MAX6353UK-T) or devices with WDI instead of RSTIN (e.g., MAX6359UT-T), as Pin 5 function differs across the family. Always verify Pin 5 role before substitution.