Analog Devices Inc./Maxim Integrated MAX6316LUK29BX+

Overview

MAX6316LUK29BX+ from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low push/pull reset output, 2.93V factory-trimmed reset threshold, 140ms minimum reset timeout, and 1.6s typical watchdog timeout. It monitors VCC supply voltage and provides reset assertion during power-up, brownout, or software hang conditions in embedded control systems.

For engineers reviewing the MAX6316LUK29BX+ datasheet, MAX6316LUK29BX+ pinout, MAX6316LUK29BX+ application, or MAX6316LUK29BX+ equivalent, key selection criteria include guaranteed reset validity down to VCC = 1V, immunity to short negative VCC transients (<4µs), manual reset input with 100ns glitch rejection, and AEC-Q100 qualification for automotive-grade reliability.

Technical Context

The MAX6316LUK29BX+ integrates a precision voltage detector with ±1.5% threshold accuracy at +25°C (±2.5% over –40°C to +125°C), a 140ms reset timeout timer, and a 1.6s watchdog timer cleared by WDI edge transitions. Its push/pull reset output sources/sinks current without external components and remains valid down to VCC = 1V.

It features a manual reset input (MR) with internal 52kΩ pullup, 1µs minimum pulse width, and 100ns glitch rejection. The watchdog input (WDI) accepts 50ns minimum pulses and draws ≤160µA average current when actively serviced.

Key Specifications

Pinout & Package

MAX6316LUK29BX+ 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 MAX6316MUK29BX+, MAX6316LUK29BX+ offers simpler push/pull drive for conventional µP reset inputs, while TPS3808G33DBVR trades watchdog capability and adjustable threshold for lower IQ and tighter 3.3V accuracy-making MAX6316LUK29BX+ the balanced choice for 2.93V brownout + watchdog-reliant designs.

Availability

MAX6316LUK29BX+ 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 production lifecycles.

Supply support for MAX6316LUK29BX+ 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 automotive, industrial, and computing applications, emphasizing high reliability and integration.

The MAX6316–MAX6322 family targets microprocessor supervision in harsh environments, delivering factory-trimmed voltage thresholds, configurable timeouts, and AEC-Q100 qualification for mission-critical reset assurance.

FAQ

What is the exact reset threshold voltage of MAX6316LUK29BX+ and how is it trimmed?

The MAX6316LUK29BX+ has a factory-laser-trimmed nominal reset threshold of 2.93V, with ±1.5% tolerance at +25°C and ±2.5% over –40°C to +125°C. This value is set using precision laser trimming of on-chip resistors during final test, ensuring consistent performance without external calibration. The "29" in the part number directly references the 2.93V threshold per Maxim's ordering convention.

Does MAX6316LUK29BX+ support manual reset, and what are its electrical characteristics?

Yes, MAX6316LUK29BX+ includes an active-low manual reset (MR) input with internal 52kΩ pullup to VCC. It requires a minimum 1µs pulse width at –40°C to +85°C (1.5µs up to +125°C) and rejects glitches as short as 100ns. MR accepts TTL/CMOS logic levels and can be driven by open-drain sources or a momentary switch to ground-no external debouncing needed.

What is the watchdog timeout behavior of MAX6316LUK29BX+, and how is it disabled?

MAX6316LUK29BX+ features a 1.6s typical watchdog timeout (designated by "Y" in the part number suffix). The internal timer clears on any WDI edge transition (rising or falling) and resets upon deassertion of RESET. To disable the watchdog, leave WDI unconnected-the internal counter automatically services itself with low-high-low pulses at 7/8 the timeout period.

Can MAX6316LUK29BX+ operate reliably at VCC = 1.2V, and what happens to RESET output?

Yes, MAX6316LUK29BX+ guarantees valid RESET output down to VCC = 1V. At VCC = 1.2V, the push/pull RESET output maintains VOL ≤ 0.3V (with 100µA sink) and VOH ≥ 0.8 × VCC (≥0.96V), ensuring clean logic-level signaling to µPs operating at ultra-low voltage. This enables robust brownout recovery in energy-harvesting and coin-cell systems.

Is MAX6316LUK29BX+ qualified for automotive applications, and what does AEC-Q100 qualification cover?

Yes, MAX6316LUK29BX+ is AEC-Q100 qualified (Grade 1: –40°C to +125°C junction temperature). This qualification covers stress testing for human-body-model ESD (≥2kV), latch-up immunity, temperature cycling, high-temperature operating life (1000 hours at +125°C), and mechanical shock/vibration-ensuring suitability for under-hood and transmission-control module deployments.