Analog Devices Inc./Maxim Integrated MAX6362PUT26

Overview

MAX6362PUT26 from Maxim Integrated is a low-power microprocessor supervisory circuit with integrated watchdog timer, battery switchover, and power-fail warning functionality. It operates from +1.2V supply, features factory-preset 2.63V reset threshold, 1.6s watchdog timeout, 150ms minimum reset timeout, and active-low open-drain RESET output in SOT23-6 package. It is used in portable/battery-powered equipment to maintain SRAM backup integrity during brownout.

For engineers reviewing the MAX6362PUT26 datasheet, MAX6362PUT26 pinout, MAX6362PUT26 application, or MAX6362PUT26 equivalent, key selection criteria include guaranteed reset assertion down to 1.2V, watchdog input (WDI) timing behavior, battery switchover hysteresis, SOT23-6 footprint compatibility, and reset threshold accuracy over temperature.

Technical Context

The MAX6362PUT26 implements a dedicated watchdog timer with 1.00–2.25s timeout range (typical 1.6s), cleared by any WDI edge transition. Its internal comparator monitors VCC against a precision 2.63V threshold (±1.5% over -40°C to +85°C), asserting reset when VCC falls below threshold and holding for ≥150ms after recovery.

Battery switchover occurs automatically when VCC drops below VBATT − 0.15V, connecting BATT to OUT via an internal MOSFET with on-resistance <2.7Ω at VBATT = 2.8V. The device guarantees RESET/RESET validity down to 1.2V on either VCC or VBATT, supporting ultra-low-voltage operation in backup mode.

Key Specifications

Pinout & Package

Package: 6-pin SOT23 (U6-1 outline, 2.9mm × 1.6mm × 1.1mm height), RoHS-compliant lead-free (indicated by "+T" suffix; this part uses "-T").

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6362PUT26, MAX6362HUT26 offers identical performance in a non-RoHS package, while TPS3808G125DBVR provides basic reset supervision without watchdog capability-making MAX6362PUT26 the only option among the three that delivers integrated brownout protection, battery switchover, and hardware watchdog in one SOT23-6 device.

Availability

MAX6362PUT26 is available at Aetrix Electronics and suitable for portable medical monitors, industrial data loggers, POS terminals, and smart utility meters requiring stable component supply across extended product lifecycles.

Supply support for MAX6362PUT26 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 demanding industrial, automotive, and computing applications.

The MAX6361–MAX6364 family was engineered specifically for low-power µP systems needing coordinated reset, battery backup, and watchdog supervision in minimal footprint-targeting portable, battery-critical, and high-reliability embedded platforms.

FAQ

What is the exact reset threshold voltage of MAX6362PUT26?

The MAX6362PUT26 has a factory-preset reset threshold of 2.63V, with guaranteed tolerance of ±1.5% over the full operating temperature range (-40°C to +85°C). This value is laser-trimmed during production and documented in the Electrical Characteristics table under "MAX636_UT26" suffix. It is optimized for reliable monitoring of 2.5V logic rails with margin.

Does MAX6362PUT26 support true battery backup switchover, and what is the hysteresis?

Yes, MAX6362PUT26 supports automatic battery switchover: when VCC falls below (VBATT − 0.15V), it connects BATT to OUT via an internal MOSFET. The 40mV hysteresis (VBATT − VCC ≥ 0.15V to engage, ≤ 0.11V to disengage) prevents oscillation during slow VCC decay. This behavior is confirmed in the Pin Description and Detailed Description sections of the datasheet.

What is the watchdog timeout period for MAX6362PUT26, and how is it cleared?

The MAX6362PUT26 watchdog timeout period is 1.6s typical (1.00–2.25s min/max). It is cleared by any rising or falling edge on the WDI pin within the timeout window. The internal timer resets on each valid edge-no pulse width requirement beyond 100ns minimum-and also clears automatically when RESET is asserted. This ensures robust detection of firmware lockups.

Can MAX6362PUT26 operate with VCC as low as 1.2V, and is RESET guaranteed functional at that level?

Yes, MAX6362PUT26 guarantees full functionality-including RESET assertion and validity-down to 1.2V on either VCC or VBATT. The datasheet explicitly states "RESET/RESET Valid Down to 1.2V Guaranteed (VCC or VBATT)" and confirms operation at 1.2V in the Electrical Characteristics table (ICC measured at VCC = 2.8V, but ABSOLUTE MAXIMUM RATINGS and Operating Voltage Range both specify 0 to 5.5V with 1.2V minimum).

What package type and RoHS status does MAX6362PUT26 use?

MAX6362PUT26 uses a 6-pin SOT23 package (outline U6-1, land pattern 90-0175) with lead-free termination, indicated by the "-T" suffix per Maxim's ordering convention. The "PUT" prefix denotes Pb-free tape-and-reel packaging. This is confirmed in the Ordering Information table and Package Information section, which references RoHS compliance for "-T" parts.