Analog Devices Inc./Maxim Integrated MAX6316LUK26DZ+

Overview

MAX6316LUK26DZ+ from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low push/pull reset output, 2.63V factory-trimmed reset threshold (±2.5% over -40°C to +125°C), 1.12s minimum reset timeout, and 25.6s typical watchdog timeout. It monitors VCC supply voltage, supports manual reset via MR pin, and ensures reliable reset assertion during power-up, brownout, and software lockup in embedded control systems.

For engineers reviewing the MAX6316LUK26DZ+ datasheet, MAX6316LUK26DZ+ pinout, MAX6316LUK26DZ+ application, or MAX6316LUK26DZ+ equivalent, key selection criteria include its guaranteed reset validity down to VCC = 1V, immunity to short negative VCC transients (<4µs at 100mV under VTH), bidirectional reset compatibility support (via internal active pullup), and AEC-Q100 qualification for automotive-grade reliability.

Technical Context

The MAX6316LUK26DZ+ implements a precision bandgap-based reset generator with laser-trimmed voltage divider setting nominal VTH = 2.63V, ±2.5% tolerance across -40°C to +125°C. Its reset assertion is triggered by VCC falling below VTH, MR pin low transition, or WDI inactivity exceeding 25.6s - all followed by a fixed 1.12s (min) reset-active period before deassertion.

It integrates a watchdog timer cleared on any WDI edge (≥50ns pulse width), with internal servicing when WDI is unconnected. The push/pull RESET output guarantees VOL ≤ 0.4V at ISINK = 3.2mA (VCC ≥ 4.5V) and VOH ≥ 0.8×VCC at ISOURCE = 500µA (VCC ≥ 2.7V), enabling direct interface with CMOS microcontrollers without external components.

Key Specifications

Pinout & Package

MAX6316LUK26DZ+ 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 PCB 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 MAX6316MUK26DZ+, the MAX6316LUK26DZ+ provides direct push/pull drive eliminating external pullup needs, while versus TPS3808G125DBVR it adds critical watchdog supervision and longer reset hold time essential for firmware recovery in safety-critical embedded systems.

Availability

MAX6316LUK26DZ+ is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, portable medical monitors, and battery-powered smart sensor nodes requiring stable component supply with automotive-grade reliability and long-term lifecycle support.

Supply support for MAX6316LUK26DZ+ 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 demanding applications in automotive, industrial, communications, and computing markets.

The MAX6316–MAX6322 family was engineered specifically for robust microprocessor supervision in harsh environments, combining precision voltage monitoring, configurable reset timing, watchdog protection, and AEC-Q100 qualification in miniature SOT23 packages.

FAQ

What is the exact reset threshold voltage of MAX6316LUK26DZ+ and how tightly is it specified?

The MAX6316LUK26DZ+ features a factory-trimmed nominal reset threshold of 2.63V, with guaranteed tolerance of ±2.5% over the full operating temperature range of −40°C to +125°C. This corresponds to a worst-case range of 2.564V to 2.696V at temperature extremes, ensuring precise brownout detection for 2.7V and 3.3V systems without external calibration.

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

Yes, MAX6316LUK26DZ+ includes a watchdog timer with a typical timeout period of 25.6s. This value is factory-programmed using the "Z" suffix in the part number and is confirmed in the Selector Guide and Electrical Characteristics table. The timer resets on any rising or falling edge at the WDI pin and remains cleared while RESET is asserted.

What type of reset output does MAX6316LUK26DZ+ provide, and what are its drive capabilities?

MAX6316LUK26DZ+ provides an active-low, push/pull reset output. It guarantees VOL ≤ 0.4V when sinking 3.2mA (at VCC ≥ 4.5V) and VOH ≥ 0.8×VCC when sourcing 500µA (at VCC ≥ 2.7V). This eliminates the need for external pullup resistors and enables direct connection to standard CMOS microcontroller reset inputs.

Is MAX6316LUK26DZ+ qualified for automotive applications, and what is its temperature rating?

Yes, MAX6316LUK26DZ+ is AEC-Q100 qualified per Grade 1, supporting operation from −40°C to +125°C. Its design includes guaranteed reset functionality down to VCC = 1V and immunity to short-duration negative VCC transients - key requirements for automotive body electronics, infotainment, and ADAS subsystems.

How does the manual reset (MR) pin function on MAX6316LUK26DZ+, and is external debouncing required?

The MR pin on MAX6316LUK26DZ+ is an active-low input with internal 52kΩ pullup to VCC and built-in 100ns glitch rejection. Pulling MR low forces a reset that remains asserted for the full 1.12s timeout period after MR returns high. No external debouncing circuitry is needed - a simple momentary switch from MR to GND suffices for field service reset functionality.