Analog Devices Inc./Maxim Integrated MAX6358TYUT

Overview

MAX6358TYUT from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with open-drain active-low reset output, 3.08V VCC1 threshold, 2.19V VCC2 threshold, 46.4s watchdog startup timeout, and 2.9s normal watchdog timeout. It monitors two independent supply rails in multivoltage systems and asserts reset if either supply drops below its preset threshold while maintaining valid reset output down to VCC1 ≥ 1.0V or VCC2 ≥ 1.0V.

For engineers reviewing the MAX6358TYUT datasheet, MAX6358TYUT pinout, MAX6358TYUT application, or MAX6358TYUT equivalent, key selection factors include dual-supply monitoring capability, guaranteed reset validity at low supply voltage, watchdog timer architecture with startup/normal modes, SOT23-6 package compatibility, and precise factory-set voltage thresholds.

Technical Context

The MAX6358TYUT implements a dual-threshold comparator architecture that independently monitors VCC1 and VCC2 against factory-trimmed trip points (3.08V and 2.19V respectively), asserting reset when either supply falls below its threshold. Its watchdog timer features two distinct timeout periods: a 46.4s startup mode for system initialization and a 2.9s normal mode for runtime supervision.

Reset assertion is guaranteed as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V, enabling reliable operation during brownout conditions. The open-drain RST output supports flexible pull-up configurations and interfaces directly with µP reset inputs requiring external pull-up resistors.

Key Specifications

Pinout & Package

The MAX6358TYUT is housed in a 6-pin SOT23 package (U6-1 outline) with 0.95mm pitch, compatible with standard surface-mount assembly processes and PCB footprints per land pattern 90-0175.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6358TUT and TPS3808G33DBVR, the MAX6358TYUT uniquely provides asymmetric dual-threshold monitoring (3.08V/2.19V) in a single IC, eliminating need for discrete solutions while supporting brownout resilience and watchdog supervision in compact SOT23-6 footprint.

Availability

MAX6358TYUT is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical devices, automotive infotainment head units, and network edge routers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6358TYUT 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 integrated dual- and triple-voltage supervision with watchdog timers for reliable µP reset control in multirail embedded systems.

FAQ

What is the exact VCC1 and VCC2 threshold voltage for MAX6358TYUT?

The MAX6358TYUT has a factory-trimmed VCC1 threshold of 3.08V (±0.08V over temperature) and VCC2 threshold of 2.19V (±0.06V over temperature), as defined by the "TY" suffix in the Voltage Threshold Levels table. These values are laser-trimmed during production and guaranteed across the -40°C to +85°C operating range, enabling precise reset activation for asymmetric supply rails such as +3.3V and +2.2V systems.

Does MAX6358TYUT provide push-pull or open-drain reset output?

The MAX6358TYUT provides an active-low open-drain RST output (Pin 1), as confirmed by the Pin Description table and functional diagram. This configuration requires an external pull-up resistor and supports wired-OR connections with other reset sources. Unlike push-pull variants (e.g., MAX6359TYUT), the MAX6358TYUT does not drive the reset line high internally, making it compatible with systems needing level translation or multi-source reset arbitration.

What are the watchdog timeout periods supported by MAX6358TYUT?

The MAX6358TYUT implements a dual-mode watchdog timer with a 46.4s startup timeout period (for initial system boot and initialization) and a 2.9s normal timeout period (for runtime supervision). These values are fixed and factory-configured - not user-programmable - and are specified in the Electrical Characteristics table under "Watchdog Timeout Period". The timer resets on any WDI edge and triggers RST assertion if no transition occurs within the active timeout window.

Can MAX6358TYUT operate with supply voltages below 1.2V?

The MAX6358TYUT guarantees functional reset assertion as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V, per Absolute Maximum Ratings and Electrical Characteristics. However, the recommended operating range is VCC1/VCC2 = +1.2V to +5.5V. Operation below 1.2V is limited to brownout recovery scenarios where reset validity must be maintained during supply decay - the device does not actively monitor or generate reset below 1.0V, and all specifications (e.g., thresholds, current) are not guaranteed below 1.2V.

What package type and footprint does MAX6358TYUT use?

The MAX6358TYUT uses a 6-pin SOT23 package (package code U6-1, outline 21-0058, land pattern 90-0175), with 0.95mm lead pitch and standardized dimensions per JEDEC MO-178. This compact surface-mount package supports automated assembly and is compatible with industry-standard reflow profiles. The "UT" suffix in the part number explicitly denotes the SOT23-6 packaging variant, distinguishing it from 5-pin SOT23 versions like MAX6352.