Analog Devices Inc./Maxim Integrated MAX6316LUK26DY+T

Overview

MAX6316LUK26DY+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, 140ms minimum reset timeout, and 1.6s typical watchdog timeout. It monitors VCC supply voltage, provides manual reset input (MR), and asserts reset during power-up, brownout, or software hang conditions in embedded control systems.

For engineers reviewing the MAX6316LUK26DY+T datasheet, MAX6316LUK26DY+T pinout, MAX6316LUK26DY+T application, or MAX6316LUK26DY+T equivalent, key selection criteria include guaranteed reset validity down to VCC = 1V, immunity to short negative VCC transients (<4µs at 100mV under threshold), no external components required, and AEC-Q100 qualification for automotive-grade reliability.

Technical Context

The MAX6316LUK26DY+T implements a precision bandgap-based reset generator with laser-trimmed voltage divider setting VRST = 2.63V ±2.5% over -40°C to +125°C. Its reset assertion is triggered by VCC falling below VRST, MR low pulse, or WDI inactivity beyond 1.6s watchdog period - all followed by fixed 140ms reset hold time after recovery.

It features an active-low push/pull RESET output capable of sourcing/sinking ≥500µA at VCC ≥2.7V (VOH ≥0.8×VCC, VOL ≤0.3V), with guaranteed logic-level validity down to VCC = 1V. The MR input includes internal 52kΩ pullup and 100ns glitch rejection; WDI accepts 50ns minimum pulses and draws ≤160µA average current when actively toggled.

Key Specifications

Pinout & Package

MAX6316LUK26DY+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. Thermal resistance θJA = 255.9°C/W on multilayer board enables operation at full rating up to +125°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6316LUK26DY+T, MAX6316MUK26DY+T adds bidirectional reset capability at the cost of higher complexity for non-bidirectional µPs, while TPS3808G125DBVR trades watchdog functionality and wider temperature range for lower ICC and tighter threshold tolerance - making each optimal for distinct system-level trade-offs.

Availability

MAX6316LUK26DY+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, medical infusion pump controllers, and smart energy meter MCUs requiring stable component supply across extended temperature and high-reliability environments.

Supply support for MAX6316LUK26DY+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 demanding industrial, automotive, and communications applications, with emphasis on reliability, integration, and low-power operation.

The MAX6316–MAX6322 family delivers highly configurable μP supervision with factory-trimmed thresholds, multiple reset/watchdog timing options, and AEC-Q100 qualification - targeting safety-critical embedded systems where deterministic power sequencing and fault recovery are mandatory.

FAQ

What is the exact reset threshold voltage of MAX6316LUK26DY+T and how tightly is it specified?

The MAX6316LUK26DY+T has a factory-trimmed nominal reset threshold of 2.63V, with tolerance of ±2.5% over the full operating temperature range (-40°C to +125°C). At +25°C, the specification tightens to ±1.5%, yielding VRST = 2.591V to 2.669V. This precision eliminates need for external resistor calibration and ensures robust operation in 2.7V/3.3V systems with marginal supply headroom.

Does MAX6316LUK26DY+T require external components to operate?

No, MAX6316LUK26DY+T operates autonomously with no external components required. It integrates a precision voltage reference, laser-trimmed resistor divider for 2.63V threshold, internal 52kΩ pullup on MR, and complete watchdog timer. Only VCC decoupling (0.1µF ceramic) is recommended per standard analog design practice - no RC networks, pullups, or timing capacitors are needed.

How does the watchdog function work in MAX6316LUK26DY+T and what is its timeout value?

The MAX6316LUK26DY+T watchdog timer asserts reset if the WDI pin remains static (high or low) for longer than its factory-set timeout of 1.6s (typical). The timer clears on any rising or falling edge at WDI - including pulses as short as 50ns - and remains cleared while reset is active. Leaving WDI unconnected disables the watchdog entirely, causing internal servicing at 7/8 of the timeout period.

Is MAX6316LUK26DY+T compatible with automotive applications?

Yes, MAX6316LUK26DY+T is AEC-Q100 qualified for Grade 1 operation (-40°C to +125°C) and manufactured in an automotive-capable flow. Its guaranteed reset validity down to VCC = 1V, immunity to <4µs VCC transients, and 125°C junction rating make it suitable for engine control, body electronics, and ADAS subsystems where reliability under extreme electrical and thermal stress is mandatory.

What is the function of Pin 3 (MR) on MAX6316LUK26DY+T and how should it be used?

Pin 3 is the active-low Manual Reset (MR) input. Pulling MR low forces an immediate reset that persists for the full 140ms timeout after MR returns high. MR is internally pulled up to VCC via 52kΩ, so it may be left floating when unused. For pushbutton use, connect a normally-open switch from MR to GND - no external debouncing is required due to built-in 100ns glitch rejection.