Analog Devices Inc./Maxim Integrated MAX6316LUK45BX+

Overview

MAX6316LUK45BX+ from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low push/pull reset output, 4.5V factory-trimmed reset threshold (±1.5% at +25°C), 140ms minimum reset timeout, and 102ms typical watchdog timeout. It monitors VCC supply voltage, provides manual reset input (MR), and asserts reset during power-up, brownout, or software hang - used in portable computers and embedded control systems.

For engineers reviewing the MAX6316LUK45BX+ datasheet, MAX6316LUK45BX+ pinout, MAX6316LUK45BX+ application, or MAX6316LUK45BX+ equivalent, key selection criteria include guaranteed reset validity down to VCC = 1V, immunity to sub-4µs negative VCC transients, bidirectional reset compatibility (not applicable to this variant), and AEC-Q100 qualification for automotive-grade reliability.

Technical Context

The MAX6316LUK45BX+ implements a precision bandgap-based reset threshold detector with 40ppm/°C temperature coefficient and internal hysteresis of 3mV. Its reset generator guarantees assertion while VCC remains below 4.5V ±1.5%, holding RESET low for ≥140ms after VCC rises above threshold.

It integrates a watchdog timer cleared by WDI edge transitions (50ns minimum pulse width) and a manual reset input with 100ns glitch rejection, internal 52kΩ pullup, and TTL/CMOS-compatible thresholds. The push/pull output drives high/low with VOL ≤0.3V (ISINK = 1.2mA, VCC ≥2.7V) and VOH ≥0.8×VCC (ISOURCE = 500µA, VCC ≥2.7V).

Key Specifications

Pinout & Package

MAX6316LUK45BX+ is housed in a RoHS-compliant 5-pin SOT23 package (package code U5+2A, outline 21-0057), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and thermal resistance 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 MAX6316LUK45BX+, MAX6316LUK46BY+ offers tighter alignment to 4.63V systems but identical timing and interface behavior, whereas TPS3808G33DBVR sacrifices watchdog/MR functionality for lower quiescent current and simplified design - requiring PCB layout changes and firmware adaptation.

Availability

MAX6316LUK45BX+ is available at Aetrix Electronics and suitable for portable computers, embedded control systems, and intelligent instruments requiring stable component supply across automotive and industrial temperature ranges.

Supply support for MAX6316LUK45BX+ 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 power, sensing, and connectivity applications, with emphasis on high-reliability industrial and automotive markets.

The MAX6316–MAX6322 family delivers integrated μP supervision with configurable reset thresholds, watchdog timers, and manual reset inputs - engineered specifically for space-constrained, mission-critical digital systems demanding robust power-on and fault-recovery behavior.

FAQ

What is the exact reset threshold voltage of MAX6316LUK45BX+ and how does it vary with temperature?

The MAX6316LUK45BX+ has a factory-trimmed nominal reset threshold of 4.5V, specified as ±1.5% at +25°C and ±2.5% over -40°C to +125°C. Its temperature coefficient is 40ppm/°C, meaning drift is bounded and predictable - for example, at +125°C, deviation remains within the ±2.5% limit, ensuring reliable operation across full industrial range. This precision eliminates need for external calibration in MAX6316LUK45BX+ designs.

Does MAX6316LUK45BX+ support both watchdog and manual reset functions simultaneously?

Yes, MAX6316LUK45BX+ fully supports concurrent watchdog and manual reset functionality. The WDI pin detects edges to clear the 102ms watchdog timer, while the MR pin asserts reset when pulled low for ≥1µs. Both independently trigger the same reset output with identical 140ms timeout - allowing system-level recovery from either software lockup (via WDI) or user-initiated reset (via MR) without conflict or priority arbitration.

What is the maximum supply voltage rating for MAX6316LUK45BX+ and what happens if VCC exceeds it?

MAX6316LUK45BX+ has an absolute maximum VCC rating of +6V. Exceeding this voltage - even briefly - risks permanent damage per Absolute Maximum Ratings. Operation above 5.5V (recommended max) degrades long-term reliability and may cause latch-up or parametric shift. The device is designed for 1.0V–5.5V operation, and its reset function remains valid down to 1V, making overvoltage protection essential in MAX6316LUK45BX+ power domains.

Can MAX6316LUK45BX+ be used in automotive applications, and what qualification does it hold?

Yes, MAX6316LUK45BX+ is AEC-Q100 qualified (Grade 1: -40°C to +125°C), making it suitable for automotive applications such as body control modules, infotainment power sequencing, and ADAS sensor interfaces. Its guaranteed operation down to VCC = 1V, immunity to fast VCC transients, and 125°C junction rating meet stringent automotive reliability requirements - confirmed in the official MAX6316LUK45BX+ datasheet and Maxim's automotive product documentation.

Is the reset output of MAX6316LUK45BX+ compatible with 1.8V logic systems?

No, MAX6316LUK45BX+ reset output is not directly compatible with 1.8V logic systems. Its push/pull output VOH is specified as ≥0.8×VCC (minimum) when sourcing 500µA, meaning at VCC = 1.8V, VOH ≥1.44V - insufficient for reliable 1.8V CMOS high-level recognition (typically requires ≥1.62V). For 1.8V systems, use MAX6316 variants with lower threshold (e.g., MAX6316LUK18BX+) or level-shifting circuitry with MAX6316LUK45BX+.