Analog Devices Inc./Maxim Integrated MAX6316LUK29CY+T

Overview

MAX6316LUK29CY+T 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 MAX6316LUK29CY+T datasheet, MAX6316LUK29CY+T pinout, MAX6316LUK29CY+T application, or MAX6316LUK29CY+T equivalent, key selection criteria include guaranteed reset validity down to VCC = 1V, immunity to short negative VCC transients (<4µs at 100mV under threshold), manual reset input with 1µs pulse width support, and AEC-Q100 qualification for automotive-grade reliability.

Technical Context

The MAX6316LUK29CY+T integrates a precision voltage detector with ±1.5% threshold accuracy at +25°C and ±2.5% over –40°C to +125°C, a 140ms reset timeout generator, and a 1.6s watchdog timer cleared by WDI edge transitions. Its push/pull reset output sources/sinks current and remains valid down to VCC = 1V.

It features a manual reset (MR) input with internal 52kΩ pullup, 100ns glitch rejection, and 230ns MR-to-reset propagation delay at VCC = 5V. The watchdog input accepts 50ns minimum pulses and draws ≤160µA average current when actively toggled.

Key Specifications

Pinout & Package

MAX6316LUK29CY+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 thermal resistance θ_JA = 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 MAX6316LUK29CY+T, MAX6316MUK29CY+T supports bidirectional reset arbitration but lacks push/pull drive strength, while TPS3808G33DBVR offers lower cost and smaller footprint but omits watchdog functionality and precise 2.93V threshold alignment.

Availability

MAX6316LUK29CY+T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6316LUK29CY+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 industrial, automotive, and communications applications, with emphasis on high-reliability, low-power, and integrated functionality.

The MAX6316–MAX6322 family delivers compact, factory-trimmed supervisory circuits targeting space-constrained embedded systems requiring guaranteed reset timing, watchdog safety, and AEC-Q100 compliance.

FAQ

What is the exact reset threshold voltage of the MAX6316LUK29CY+T?

The MAX6316LUK29CY+T has a factory-trimmed nominal reset threshold of 2.93V, with ±1.5% tolerance at +25°C and ±2.5% over the full –40°C to +125°C operating range. This value is laser-trimmed during manufacturing and documented in Table 1 of the MAX6316–MAX6322 datasheet. The MAX6316LUK29CY+T uses this specific threshold to align precisely with 3.3V supply rails during brownout detection.

Does the MAX6316LUK29CY+T include a watchdog timer, and what is its timeout period?

Yes, the MAX6316LUK29CY+T includes a watchdog timer with a typical timeout period of 1.6 seconds. This value corresponds to the "Y" suffix in the ordering code and is factory-programmed. The timer resets on any rising or falling edge at the WDI pin and remains cleared while RESET is asserted. The MAX6316LUK29CY+T uses this watchdog interval to detect firmware hangs without requiring software polling overhead.

What type of reset output does the MAX6316LUK29CY+T provide, and how is it driven?

The MAX6316LUK29CY+T provides an active-low push/pull reset output on Pin 1. It actively sources current when deasserted (logic high) and sinks current when asserted (logic low), eliminating the need for an external pullup resistor. At VCC ≥ 2.7V, it sinks ≥1.2mA and sources ≥500µA, enabling direct interface with standard CMOS microcontrollers. This push/pull architecture distinguishes the MAX6316LUK29CY+T from open-drain or bidirectional variants in the same family.

Is the MAX6316LUK29CY+T qualified for automotive applications?

Yes, the MAX6316LUK29CY+T is AEC-Q100 qualified, meeting Grade 1 temperature requirements (–40°C to +125°C) and undergoing stress testing for automotive reliability. Its guaranteed operation down to VCC = 1V, immunity to short negative VCC transients (<4µs), and factory-trimmed 2.93V threshold make it suitable for body control modules, infotainment power domains, and other non-safety-critical automotive subsystems. The "+T" suffix confirms lead-free RoHS compliance per automotive standards.

What are the key timing parameters for manual reset operation on the MAX6316LUK29CY+T?

The MAX6316LUK29CY+T manual reset (MR) input requires a minimum pulse width of 1.5µs over the full –40°C to +125°C range and rejects glitches shorter than 100ns. After MR transitions from low to high, RESET remains asserted for the full 140ms reset timeout period. Propagation delay from MR low-to-high to RESET deassertion is 230ns at VCC = 5V. These parameters ensure robust pushbutton reset handling without external debouncing, a core feature of the MAX6316LUK29CY+T design.