Analog Devices Inc./Maxim Integrated MAX6358MTUT+T

Overview

The MAX6358MTUT+T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with open-drain active-low reset output, 4.38V VCC1 threshold, 2.93V VCC2 threshold, 46.4s watchdog startup timeout, and 2.9s normal watchdog timeout-designed for reliable power monitoring in multivoltage embedded systems such as industrial controllers and portable instrumentation.

For engineers reviewing the MAX6358MTUT+T datasheet, MAX6358MTUT+T pinout, MAX6358MTUT+T application, or MAX6358MTUT+T equivalent, key selection criteria include dual-supply reset assertion behavior, guaranteed RESET validity down to VCC1 = 1V or VCC2 = 1V, watchdog timer architecture, SOT23-6 package compatibility, and lead-free RoHS-compliant ordering suffix (+T).

Technical Context

The MAX6358MTUT+T implements a dual-threshold voltage monitor with independent VCC1 (4.38V) and VCC2 (2.93V) trip points, asserting reset whenever either supply falls below its respective threshold. Its open-drain RST output remains valid as long as at least one supply exceeds +1.0V, enabling robust brownout detection in asymmetric power domains.

It integrates a dual-mode watchdog timer: a 46.4s startup timeout allows full system initialization after power-up or manual reset, followed by a 2.9s normal timeout that requires periodic WDI transitions to prevent reset-ensuring processor activity monitoring without false triggers during boot sequences.

Key Specifications

Pinout & Package

MAX6358MTUT+T is housed in a 6-pin SOT23 package (U6-1 outline), surface-mountable with 0.95mm pitch, RoHS-compliant, and rated for -40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6358MTUT+T, MAX6359MTUT+T offers identical voltage thresholds and watchdog timing but replaces open-drain RST with VCC1-referenced push-pull output-simplifying interface at cost of bus flexibility. TPS3808G33DBVR lacks dual-supply monitoring and watchdog entirely, making it unsuitable for applications requiring coordinated multi-rail supervision.

Availability

MAX6358MTUT+T is available at Aetrix Electronics and suitable for industrial controllers, portable instrumentation, intelligent power supplies, and multivoltage embedded systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6358MTUT+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 power management ICs for industrial, computing, and communications applications.

The MAX6351–MAX6360 family delivers highly integrated, factory-trimmed supervisory circuits targeting multivoltage systems where reliability, low power, and minimal external components are critical design requirements.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6358MTUT+T?

The MAX6358MTUT+T has a factory-trimmed VCC1 threshold of 4.38V (±0.08V over -40°C to +85°C) and a VCC2 threshold of 2.93V (±0.05V over temperature). These values correspond to the "MT" suffix in the Voltage Threshold Levels table and are guaranteed without external calibration. The MAX6358MTUT+T uses these precise thresholds to assert reset when either monitored supply falls below its respective level.

Does the MAX6358MTUT+T provide watchdog functionality, and what are its timeout periods?

Yes, the MAX6358MTUT+T includes a dual-mode watchdog timer with a 46.4s startup timeout period (applied after power-up, manual reset, or watchdog reset) and a 2.9s normal timeout period (active once startup completes or after first WDI transition). The WDI pin must receive a rising or falling edge within each timeout window to prevent reset assertion. This architecture is confirmed in the Electrical Characteristics table and Functional Diagram of the MAX6358MTUT+T datasheet.

What type of reset output does the MAX6358MTUT+T feature, and how is it configured?

The MAX6358MTUT+T features an active-low open-drain RST output (Pin 1), requiring an external pull-up resistor to the appropriate logic rail. Unlike push-pull variants (e.g., MAX6359), this configuration enables wired-OR connection with other reset sources. The output remains valid as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V, supporting robust reset signaling during partial power loss. This behavior is explicitly defined in the Pin Description and Absolute Maximum Ratings sections for the MAX6358MTUT+T.

What is the operating temperature range and supply current specification for the MAX6358MTUT+T?

The MAX6358MTUT+T operates over the extended industrial temperature range of -40°C to +85°C and draws only 20µA typical supply current (ICC1 + ICC2) at VCC1 = 5.5V and VCC2 = 3.6V. This ultra-low quiescent current is fully characterized across temperature and supports energy-constrained applications such as battery-powered instrumentation. All electrical parameters-including supply current-are guaranteed over the full -40°C to +85°C range for the MAX6358MTUT+T.

How does the manual reset (MR) input function on the MAX6358MTUT+T?

The MR input (Pin 3) is a debounced, TTL/CMOS-compatible active-low signal that forces reset when pulled below 0.8V (for L/M-suffix devices) for ≥1µs. Reset remains asserted for the full timeout period (100–280ms) after MR returns high. The MR pin includes internal pull-up resistance (32–100kΩ) and glitch rejection (100ns), eliminating need for external RC filtering. This behavior is documented in the Electrical Characteristics and Pin Description sections specific to the MAX6358MTUT+T.