Analog Devices Inc./Maxim Integrated MAX6362PUT23+T

Overview

MAX6362PUT23+T from Maxim Integrated is a SOT23-6 watchdog supervisory circuit for microprocessor systems, featuring a 1.6s watchdog timeout, factory-preset 2.32V reset threshold, active-low open-drain RESET output, and battery switchover capability for SRAM backup. It operates from +1.2V to +5.5V and supports brownout detection in portable instrumentation and industrial controllers.

For engineers reviewing the MAX6362PUT23+T datasheet, MAX6362PUT23+T pinout, MAX6362PUT23+T application, or MAX6362PUT23+T equivalent, key selection criteria include guaranteed RESET assertion down to 1.2V supply, 150ms minimum reset timeout, WDI glitch immunity (100ns), and precise VCC monitoring with ±0.5% threshold accuracy over temperature.

Technical Context

The MAX6362PUT23+T integrates a precision voltage monitor, 1.6s watchdog timer with edge-triggered clear logic, and bidirectional power-path control between VCC and BATT. Its internal comparator references a trimmed 1.235V bandgap, enabling accurate reset assertion at 2.32V (±1.5% over -40°C to +85°C) with 40mV hysteresis for noise immunity.

It implements automatic battery switchover when VCC falls below both the reset threshold and VBATT by ≥20mV, connecting BATT to OUT via a low-R_ON MOSFET (typ. 2.6Ω at VBATT = 2.8V). The WDI input accepts TTL/CMOS edges and clears the watchdog on any rising or falling transition within the timeout window.

Key Specifications

Pinout & Package

Package: 6-pin SOT23 (U6-1, outline 21-0058), RoHS-compliant lead-free, -40°C to +85°C operating range.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6362PUT23+T, MAX6362HUT23+T offers identical monitoring and timing but inverted reset polarity-requiring schematic review for µP compatibility-while TPS3808G12DBVR reduces cost and complexity at the expense of critical runtime supervision and battery support.

Availability

MAX6362PUT23+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, smart energy meters, and POS terminal backup systems requiring stable component supply with long-term lifecycle assurance.

Supply support for MAX6362PUT23+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 power management, sensing, and interface applications in industrial, automotive, and computing markets.

The MAX6361–MAX6364 family delivers ultra-low-power supervisory functions with integrated battery switchover and watchdog timers, targeting space-constrained, battery-backed µP systems requiring high reliability under voltage transients.

FAQ

What is the exact reset threshold voltage of the MAX6362PUT23+T?

The MAX6362PUT23+T has a factory-preset reset threshold of 2.32V, with guaranteed tolerance of ±1.5% over the full -40°C to +85°C operating temperature range. This value is laser-trimmed during production and does not require external components. The MAX6362PUT23+T datasheet specifies 2.25V (min) and 2.38V (max) limits at TA = +25°C, confirming the 2.32V nominal point.

Does the MAX6362PUT23+T support battery switchover, and what are the engagement conditions?

Yes, the MAX6362PUT23+T supports automatic battery switchover to maintain power to OUT during main supply failure. Switchover engages only when both conditions are met: VCC falls below the 2.32V reset threshold AND VCC drops at least 20mV below VBATT. This 40mV hysteresis prevents oscillation during slow VCC decay. The MAX6362PUT23+T connects BATT to OUT via an internal MOSFET with typical R_ON of 2.6Ω at VBATT = 2.8V.

What is the watchdog timeout period for the MAX6362PUT23+T, and how is it cleared?

The MAX6362PUT23+T features a fixed 1.6s watchdog timeout period (1.00s min, 2.25s max). It is cleared on any rising or falling edge at the WDI pin-no specific pulse polarity or duration is required beyond the 100ns minimum pulse width. The internal timer also resets automatically whenever RESET asserts, enabling robust supervision even during µP reset sequences. This behavior is confirmed in the MAX6362PUT23+T Typical Operating Circuit and Figure 1.

Can the MAX6362PUT23+T operate with a 1.8V supply, and is RESET guaranteed functional at that voltage?

Yes, the MAX6362PUT23+T operates from +1.2V to +5.5V, and its RESET output is guaranteed functional down to 1.2V supply. At VCC = 1.8V, the MAX6362PUT23+T maintains full reset assertion capability: RESET remains low during undervoltage, and the 150ms timeout period is fully active. This is explicitly stated in the "RESET/RESET Valid Down to 1.2V Guaranteed" feature list and verified in the Electrical Characteristics table under VCC = 1.2V test conditions.

What package type and RoHS status does the MAX6362PUT23+T use?

The MAX6362PUT23+T uses a 6-pin SOT23 package (package code U6-1, outline 21-0058) with lead-free termination, indicated by the "+T" suffix. It complies with RoHS Directive 2011/65/EU and is rated for -40°C to +85°C operation. The "+" in "+T" explicitly denotes lead-free packaging per Maxim's marking convention, and the device meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1).