Analog Devices Inc./Maxim Integrated MAX6359SYUT+T

Overview

The MAX6359SYUT+T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with active-low push-pull reset output referenced to VCC1, 2.93V VCC1 threshold, 2.19V VCC2 threshold, watchdog timer (46.4s startup / 2.9s normal timeout), and guaranteed RESET validity down to VCC1 ≥ 1.0V or VCC2 ≥ 1.0V - used in multivoltage embedded systems requiring reliable power-on and fault detection.

For engineers reviewing the MAX6359SYUT+T datasheet, MAX6359SYUT+T pinout, MAX6359SYUT+T application, or MAX6359SYUT+T equivalent, key selection criteria include dual-supply monitoring thresholds, watchdog timing modes, push-pull reset drive capability, SOT23-6 package compatibility, and operation across –40°C to +85°C industrial temperature range.

Technical Context

This device implements a dual-threshold voltage monitor with independent VCC1 and VCC2 inputs, asserting reset when either supply falls below its factory-set trip point. The reset generator guarantees valid output as long as at least one supply remains ≥1.0V, enabling robust brownout handling in asymmetric power domains.

The integrated watchdog operates in two distinct phases: a 46.4s startup timeout allows full system initialization after power-up or manual reset, followed by a 2.9s normal timeout that detects processor lockup during steady-state operation - triggered by missing edges on the WDI input.

Key Specifications

Pinout & Package

MAX6359SYUT+T is housed in a RoHS-compliant 6-pin SOT23 package (U6-1 outline) with 0.95mm pitch, footprint-compatible with standard SOT23-6 land pattern 90-0175, suitable for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6359SYUT+T, the MAX6359SYUT-T offers identical supervision functionality in a legacy Pb-based package, while the TPS3808G33DBVR provides basic single-rail reset with lower integration - neither matches the dual-threshold, watchdog-enabled, push-pull architecture of MAX6359SYUT+T for multivoltage systems.

Availability

MAX6359SYUT+T is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld diagnostics, automotive infotainment gateways, smart energy meters, and multivoltage embedded systems requiring stable component supply across extended temperature ranges.

Supply support for MAX6359SYUT+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.

The MAX6351–MAX6360 family delivers dual- and triple-voltage microprocessor supervision with integrated watchdog timers, targeting reliability-critical embedded systems where multiple supply rails must be monitored independently.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6359SYUT+T?

The MAX6359SYUT+T has a factory-set VCC1 threshold of 2.93V (±0.05V at +25°C) and VCC2 threshold of 2.19V (±0.03V at +25°C), corresponding to the "SY" suffix per Maxim's Voltage Threshold Levels table. These values are precision-trimmed and guaranteed over –40°C to +85°C, with tempco ≤20ppm/°C.

Does the MAX6359SYUT+T provide a push-pull or open-drain reset output?

The MAX6359SYUT+T provides an active-low push-pull reset output (RST pin) referenced to VCC1, eliminating the need for an external pull-up resistor. This is confirmed in the Pin Description table and Functional Diagram, distinguishing it from open-drain variants like MAX6358.

What are the watchdog timeout periods supported by the MAX6359SYUT+T?

The MAX6359SYUT+T implements a dual-mode watchdog timer: a 46.4s startup timeout period after power-up or reset, followed by a 2.9s normal timeout period during steady-state operation. Both are guaranteed over temperature and require valid edges on the WDI pin to prevent reset assertion.

Can the MAX6359SYUT+T operate with supply voltages below 2.0V?

Yes - the MAX6359SYUT+T guarantees valid reset output as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V, and its specified operating range begins at VCC1/VCC2 = +1.2V (–40°C to +85°C). It monitors down to its threshold levels (2.93V and 2.19V) but remains functional through brownout to 1.0V.

Is the MAX6359SYUT+T pin-compatible with other devices in the MAX6351–MAX6360 family?

Yes - the MAX6359SYUT+T uses the 6-pin SOT23 package (U6-1) and shares identical pinout with all 6-pin members of the MAX6351–MAX6360 series, including MAX6351, MAX6355–MAX6358, and MAX6360. Pin functions (RST, GND, MR, VCC2, WDI, VCC1) are consistent across these variants.