Analog Devices Inc./Maxim Integrated MAX6316LUK26DZ+T

Overview

MAX6316LUK26DZ+T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low push/pull reset output, 2.63V factory-trimmed reset threshold, 1.12s minimum reset timeout, and 25.6s typical watchdog timeout. It monitors VCC supply integrity and provides manual reset and watchdog functionality for embedded control systems requiring reliable power-on and brownout protection.

For engineers reviewing the MAX6316LUK26DZ+T datasheet, MAX6316LUK26DZ+T pinout, MAX6316LUK26DZ+T application, or MAX6316LUK26DZ+T equivalent, key selection criteria include its guaranteed reset validity down to VCC = 1V, immunity to short negative VCC transients, bidirectional reset compatibility (via internal active pullup), and AEC-Q100 qualification for automotive-adjacent industrial use.

Technical Context

The MAX6316LUK26DZ+T implements a precision voltage monitor with laser-trimmed resistor divider setting VRST = 2.63V ±2.5% over –40°C to +125°C, coupled with a digital reset timer generating fixed 1.12s (D-suffix) active-low reset assertion after VCC rise. Its watchdog circuit responds to WDI edge transitions and times out after 25.6s (Z-suffix) if unserviced.

This variant belongs to the MAX6316L subfamily: it features active-low push/pull RESET output (not bidirectional or open-drain), includes both MR input and WDI input, and asserts reset on VCC drop below threshold, MR low pulse, or WDI timeout - with reset deassertion delayed by tRP = 1.12s after recovery conditions are met.

Key Specifications

Pinout & Package

MAX6316LUK26DZ+T is housed in a RoHS-compliant 5-pin SOT23 package (package code U5+2A, outline 21-0057), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads optimized for automated assembly and thermal performance (θJA = 255.9°C/W on multilayer board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6316LUK26DZ+T, MAX6316MUK26DZ+T adds bidirectional reset support at the cost of higher complexity, while TPS3808G26DBVR reduces feature set to achieve ultra-low power - making the MAX6316LUK26DZ+T optimal for balanced watchdog-enabled embedded supervision.

Availability

MAX6316LUK26DZ+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded control systems, and intelligent instruments requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.

Supply support for MAX6316LUK26DZ+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 high-performance analog and mixed-signal ICs for power, sensing, and interface applications in industrial, automotive, and communications markets.

The MAX6316–MAX6322 family was engineered specifically for robust µP supervision in space-constrained, thermally demanding systems - delivering factory-trimmed accuracy, multi-mode reset control, and automotive-grade reliability in miniature SOT23 packaging.

FAQ

What is the exact reset threshold voltage of the MAX6316LUK26DZ+T?

The MAX6316LUK26DZ+T has a factory-trimmed nominal reset threshold of 2.63V, with guaranteed tolerance of ±2.5% over the full operating temperature range (–40°C to +125°C). This value is laser-trimmed during production and specified in Table 1 of the datasheet as MAX63___26_ _-T, corresponding to the "26" suffix in the part number.

Does the MAX6316LUK26DZ+T include a watchdog timer, and what is its timeout period?

Yes, the MAX6316LUK26DZ+T includes a watchdog timer with a typical timeout period of 25.6s, indicated by the "Z" suffix in the part number. The timer resets on any rising or falling edge at the WDI pin and asserts RESET if unserviced for the full timeout duration - enabling detection of firmware hangs in long-cycle applications.

What type of reset output does the MAX6316LUK26DZ+T provide, and how is it driven?

The MAX6316LUK26DZ+T provides an active-low push/pull reset output (pin 1), capable of both sourcing and sinking current. It guarantees VOL ≤ 0.3V at ISINK = 1.2mA (VCC ≥ 2.7V) and VOH ≥ 0.8×VCC at ISOURCE = 500µA - eliminating the need for external pullup resistors in most implementations.

Can the MAX6316LUK26DZ+T operate reliably during severe supply voltage droop?

Yes, the MAX6316LUK26DZ+T guarantees valid RESET output down to VCC = 1.0V, and its internal circuitry remains functional throughout the 1.0V–5.5V operating range. This ensures deterministic reset behavior during deep brownout events where other supervisors may fail silently or assert invalid logic states.

Is the MAX6316LUK26DZ+T qualified for automotive applications?

The MAX6316LUK26DZ+T is AEC-Q100 qualified (Grade 2: –40°C to +105°C ambient), making it suitable for automotive-adjacent applications such as infotainment head units, body control modules, and ADAS sensor interfaces - though not rated for under-hood engine bay placement without additional thermal derating.