Analog Devices Inc./Maxim Integrated MAX6316LUK46CY-T

Overview

MAX6316LUK46CY-T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low push/pull reset output, 4.63V 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 MAX6316LUK46CY-T datasheet, MAX6316LUK46CY-T pinout, MAX6316LUK46CY-T application, or MAX6316LUK46CY-T equivalent, key selection criteria include guaranteed reset validity down to VCC = 1V, immunity to short negative VCC transients (<4µs at 100mV under threshold), bidirectional reset compatibility (via MR/WDI inputs), and AEC-Q100 qualification for automotive-grade reliability.

Technical Context

The MAX6316LUK46CY-T integrates a precision voltage comparator with 40ppm/°C temperature coefficient, a programmable reset timer (140ms min), and a watchdog timer (1.6s typ) that clears on WDI edge transitions. Its push/pull reset output guarantees VOL ≤ 0.3V at ISINK = 1.2mA (VCC ≥ 2.7V) and VOH ≥ 0.8×VCC at ISOURCE = 500µA (VCC ≥ 2.7V).

It features internal 52kΩ MR pullup, supports manual reset assertion via logic-low MR input, and asserts reset when VCC falls below 4.63V (±2.5% over -40°C to +125°C), after MR release, or upon WDI timeout. Reset remains active for 140ms after VCC recovery or MR deassertion.

Key Specifications

Pinout & Package

MAX6316LUK46CY-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 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 MAX6316MUK46CY-T, the MAX6316LUK46CY-T offers simpler push/pull drive but no bidirectional arbitration; versus TLV809E46DBZR, it adds critical watchdog and MR functionality at the cost of one extra pin and higher integration complexity.

Availability

MAX6316LUK46CY-T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and medical portable monitors requiring stable component supply, AEC-Q100 qualification, and guaranteed reset performance down to VCC = 1V.

Supply support for MAX6316LUK46CY-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 high-performance analog and mixed-signal ICs for industrial, automotive, communications, and computing markets.

The MAX6316–MAX6322 family delivers integrated µP supervision with configurable reset thresholds, watchdog timers, and manual reset inputs - engineered specifically for robust power monitoring in harsh environments.

FAQ

What is the exact reset threshold voltage of the MAX6316LUK46CY-T?

The MAX6316LUK46CY-T has a factory-trimmed nominal reset threshold of 4.63V, with tolerance of ±1.5% at +25°C and ±2.5% over the full operating temperature range (-40°C to +125°C). This value is confirmed in Table 1 and Table 2 of the official datasheet, and corresponds to the "46" suffix in the part number per Maxim's naming convention.

Does the MAX6316LUK46CY-T include a watchdog timer, and what is its timeout period?

Yes, the MAX6316LUK46CY-T includes a watchdog timer with a typical timeout period of 1.6 seconds. This is specified in the Selector Guide and Table 2 of the datasheet, where the "Y" in the ordering code denotes the 1.12s/1.6s/2.4s watchdog option. The timer resets on any WDI edge transition and is disabled if WDI is left unconnected.

What type of reset output does the MAX6316LUK46CY-T provide, and how is it driven?

The MAX6316LUK46CY-T provides an active-low push/pull reset output (pin 1). It actively sources and sinks current - delivering VOL ≤ 0.3V at ISINK = 1.2mA (VCC ≥ 2.7V) and VOH ≥ 0.8×VCC at ISOURCE = 500µA (VCC ≥ 2.7V). This eliminates the need for an external pullup resistor and allows direct connection to standard CMOS µP reset inputs.

Is the MAX6316LUK46CY-T qualified for automotive applications?

Yes, the MAX6316LUK46CY-T is AEC-Q100 qualified, as explicitly stated in the "Benefits and Features" section of the datasheet. It operates across -40°C to +125°C and meets automotive reliability requirements, making it suitable for body control modules, infotainment systems, and other non-safety-critical automotive ECUs.

What are the key timing parameters for reset assertion and release in the MAX6316LUK46CY-T?

The MAX6316LUK46CY-T asserts reset when VCC falls below 4.63V and holds it active for a minimum of 140ms after VCC rises above threshold. VCC-to-RESET delay is 40µs (typical), and MR-to-reset propagation delay is 230ns (at VCC = 5V). These values are specified in the Electrical Characteristics table and ensure predictable power-on sequencing and glitch immunity.