Analog Devices Inc./Maxim Integrated MAX6316LUK31DZ+

Overview

MAX6316LUK31DZ+ from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low push/pull reset output, 3.08V factory-trimmed reset threshold (±2.5% over -40°C to +125°C), 140ms minimum reset timeout, and 25.6s typical watchdog timeout. It monitors VCC supply integrity, provides manual reset input, and ensures reliable power-on/brownout reset for embedded microcontrollers.

For engineers reviewing the MAX6316LUK31DZ+ datasheet, MAX6316LUK31DZ+ pinout, MAX6316LUK31DZ+ application, or MAX6316LUK31DZ+ 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, and AEC-Q100 qualification for automotive-grade reliability.

Technical Context

The MAX6316LUK31DZ+ implements a precision voltage-monitoring comparator with laser-trimmed resistive divider (3.08V nominal threshold), a monostable reset timer (140ms min), and an independent watchdog timer (25.6s typ) cleared by WDI edge transitions. Its push/pull reset driver guarantees VOL ≤ 0.4V at ISINK = 3.2mA and VOH ≥ 0.8×VCC at ISOURCE = 500µA for VCC ≥ 2.7V.

It features integrated MR input with 52kΩ internal pullup, glitch rejection of 100ns, and WDI input designed for three-state microcontroller outputs (≤10µA leakage, ≤200pF load). The device operates across VCC = 1.0V to 5.5V and full industrial temperature range (-40°C to +125°C).

Key Specifications

Pinout & Package

MAX6316LUK31DZ+ 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 high-density PCB layouts and reflow soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6316LUK31DZ+, MAX6316LUR31DZ+ offers identical supervision functionality in a non-RoHS package, while TPS3808G33DBVR trades watchdog capability and integrated MR for lower quiescent current and simplified timing-requiring redesign for pin compatibility and feature parity.

Availability

MAX6316LUK31DZ+ is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, portable medical monitors, and smart energy meters requiring stable component supply with AEC-Q100 assurance and long-term lifecycle support.

Supply support for MAX6316LUK31DZ+ 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 computing applications, emphasizing 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 robust noise immunity-targeted at systems where deterministic reset behavior and field reliability are critical.

FAQ

What is the exact reset threshold voltage of MAX6316LUK31DZ+ and how does it vary with temperature?

The MAX6316LUK31DZ+ has a factory-trimmed nominal reset threshold of 3.08V, with tolerance of ±1.5% at +25°C and ±2.5% over the full operating range of -40°C to +125°C. Its temperature coefficient is 40ppm/°C, meaning drift is bounded and predictable-critical for stable operation in automotive and industrial thermal environments. This specification is confirmed in the Electrical Characteristics table of the official datasheet.

Does MAX6316LUK31DZ+ support manual reset, and what are the drive requirements for the MR pin?

Yes, MAX6316LUK31DZ+ includes an active-low manual reset (MR) input with an internal 52kΩ pullup resistor to VCC. It accepts TTL-logic levels in 5V systems and CMOS levels in 3V systems. The MR pin rejects transients as short as 100ns and requires only a 1µs minimum pulse width at -40°C to +85°C (1.5µs at full temperature range). No external debouncing is needed-direct connection to a momentary switch suffices.

What is the watchdog timeout period of MAX6316LUK31DZ+, and how is it triggered?

The MAX6316LUK31DZ+ features a typical watchdog timeout period of 25.6s, corresponding to the "Z" suffix in its ordering code. It is triggered when the WDI pin remains static (high or low) for the full timeout duration. The internal timer clears on any rising or falling edge at WDI-or automatically upon reset assertion-ensuring robust software execution monitoring without false timeouts due to brief signal interruptions.

Can MAX6316LUK31DZ+ operate reliably during severe supply brownout, and down to what VCC level does reset remain valid?

Yes, MAX6316LUK31DZ+ guarantees valid reset output behavior down to VCC = 1.0V-well below its 3.08V threshold-ensuring deterministic assertion of RESET even during deep brownout conditions. This is explicitly specified in the Absolute Maximum Ratings and Electrical Characteristics sections, enabling safe system shutdown and recovery in applications like automotive cold-cranking where battery voltage may dip below 2V.

Is MAX6316LUK31DZ+ RoHS-compliant and qualified for automotive use?

Yes, MAX6316LUK31DZ+ carries the "+" suffix indicating RoHS-compliant, lead-free packaging (per Maxim's ordering convention), and is AEC-Q100 qualified for Grade 1 operation (-40°C to +125°C). This dual qualification confirms suitability for both environmentally regulated commercial production and mission-critical automotive subsystems such as body control modules and ADAS sensor interfaces.