Analog Devices Inc./Maxim Integrated MAX6316LUK31BX/V+T

Overview

MAX6316LUK31BX/V+T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low push/pull reset output, 3.08V 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, and ensures reliable power-on/brownout reset for embedded controllers.

For engineers reviewing the MAX6316LUK31BX/V+T datasheet, MAX6316LUK31BX/V+T pinout, MAX6316LUK31BX/V+T application, or MAX6316LUK31BX/V+T equivalent, key selection criteria include its AEC-Q100 qualification, guaranteed reset validity down to VCC = 1V, immunity to short negative VCC transients (<4µs at 100mV under VTH), and compatibility with battery-powered and automotive control systems.

Technical Context

The MAX6316LUK31BX/V+T implements a precision voltage monitor using a laser-trimmed resistor divider to set its 3.08V reset threshold, with ±2.5% tolerance over –40°C to +125°C. Its reset generator asserts an active-low push/pull output for ≥140ms after VCC rises above threshold, while the watchdog timer clears on any WDI edge and times out after 102ms if unserviced.

This variant belongs to the MAX6316L subfamily: it includes both manual reset (MR) and watchdog input (WDI), features no bidirectional or open-drain reset, and uses internal 52kΩ MR pullup and 4.7kΩ RESET pullup (disabled during reset assertion). It is qualified per AEC-Q100 Grade 2 (–40°C to +105°C ambient).

Key Specifications

Pinout & Package

MAX6316LUK31BX/V+T is housed in a RoHS-compliant, lead-free 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 MAX6316LUK31BX/V+T, the MAX6316LUK31DZ/V+T offers longer watchdog coverage at identical reset behavior, while TLV803EB31DBVR trades supervision features for ultra-low quiescent current and lower unit cost-making each suitable for distinct firmware architecture and reliability requirements.

Availability

MAX6316LUK31BX/V+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, portable medical devices, and battery-powered sensor nodes requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MAX6316LUK31BX/V+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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.

The MAX6316–MAX6322 family delivers highly integrated, factory-trimmed supervisory circuits targeting automotive-grade reliability, low-power operation, and robust reset generation in space-constrained embedded systems.

FAQ

What is the exact reset threshold voltage of MAX6316LUK31BX/V+T and how tightly is it specified?

The MAX6316LUK31BX/V+T has a factory-trimmed nominal reset threshold of 3.08V. At +25°C, this is guaranteed within ±1.5% (i.e., 3.034V to 3.126V). Over the full operating temperature range of –40°C to +125°C, the threshold remains within ±2.5% of nominal (3.003V to 3.157V), as confirmed in Table 1 of the official datasheet. This precision eliminates need for external trimming in MAX6316LUK31BX/V+T designs.

Does MAX6316LUK31BX/V+T include both manual reset and watchdog functionality?

Yes, MAX6316LUK31BX/V+T includes both manual reset (MR) and watchdog input (WDI) features. The MR pin is active-low with internal 52kΩ pullup and 100ns glitch rejection; asserting MR low forces reset for the full 140ms timeout. The WDI pin accepts rising/falling edges to reset the watchdog timer, which times out after 102ms if unserviced - fully documented in the Selector Guide and Electrical Characteristics tables for MAX6316LUK31BX/V+T.

What package type and RoHS status does MAX6316LUK31BX/V+T use?

MAX6316LUK31BX/V+T uses a 5-pin SOT23 package with outline number 21-0057 and land pattern 90-0174. The "+T" suffix confirms it is lead(Pb)-free and RoHS-compliant. The "/V" denotes AEC-Q100 qualification (Grade 2), and the top-mark code is ACDS - all verified in the Package Information and Ordering sections of the MAX6316LUK31BX/V+T datasheet.

Can MAX6316LUK31BX/V+T operate reliably at VCC = 1.2V?

Yes, MAX6316LUK31BX/V+T guarantees valid reset output behavior down to VCC = 1V. Its push/pull RESET output maintains logic-low state with VOL ≤ 0.3V at ISINK = 100µA even at VCC = 1.2V, and VOH ≥ 0.8 × VCC at ISOURCE = 150µA. This enables robust operation during deep brownout conditions - a key specification explicitly stated in the Absolute Maximum Ratings and Electrical Characteristics sections for MAX6316LUK31BX/V+T.

How does the watchdog timeout of MAX6316LUK31BX/V+T compare to other variants in the MAX6316 family?

MAX6316LUK31BX/V+T uses the "X" watchdog timeout suffix, corresponding to 102ms typical (71ms min, 153ms max). This differs from "W" (6.3ms), "Y" (1.6s), and "Z" (25.6s) variants. The X timeout balances responsiveness and noise immunity - shorter than Y/Z for faster hang detection, longer than W to avoid false triggers from brief firmware stalls. This value is fixed per part number and cannot be adjusted externally in MAX6316LUK31BX/V+T.