Analog Devices Inc./Maxim Integrated MAX6316LUK26CY

Overview

MAX6316LUK26CY from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low open-drain reset output, 2.6V factory-trimmed reset threshold, 140ms minimum reset timeout, and 6.3ms typical watchdog timeout. It monitors VCC supply integrity and µP activity in embedded systems, asserting reset during brownout, software hang, or manual trigger - guaranteed valid down to VCC = 1V. Used in portable instrumentation and battery-powered controllers requiring robust power-on sequencing.

For engineers reviewing the MAX6316LUK26CY datasheet, MAX6316LUK26CY pinout, MAX6316LUK26CY application, or MAX6316LUK26CY equivalent, key selection criteria include reset threshold accuracy (±2.5% over -40°C to +125°C), immunity to sub-4µs VCC transients, bidirectional reset compatibility (not applicable here - this variant is open-drain), and compatibility with multi-supply reset buses via external pullup.

Technical Context

The MAX6316LUK26CY implements a precision voltage monitor with factory-laser-trimmed resistive divider setting VRST = 2.6V ±2.5%, combined with independent reset timer (tRP = 140ms min) and watchdog timer (tWD = 6.3ms typ). Its open-drain RESET output sinks up to 3.2mA at VCC ≥ 4.5V with VOL ≤ 0.4V, enabling level-shifting across supplies up to 6V when paired with an external pullup resistor.

Watchdog functionality clears on any WDI edge (rising or falling) with 50ns pulse-width detection; MR input features internal 52kΩ pullup and rejects 100ns glitches. Reset assertion is guaranteed for VCC down to 1V, and the device remains immune to fast negative VCC transients - e.g., 100mV under-VTH pulses < 4µs do not trigger false reset.

Key Specifications

Pinout & Package

MAX6316LUK26CY is housed in a RoHS-compliant 5-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), with thermal pad option not included. Pin 1 is marked by a dot or beveled edge; top-marking code is "ACDC" per Maxim's standard version table.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar µP supervisory applications.

Compared with MAX6316LUK26CY, the MAX6316LUK26DZ-T extends watchdog coverage for less time-sensitive firmware, while TPS3808G12DBVR trades manual reset and open-drain flexibility for tighter threshold tolerance and lower ICC - both require schematic and layout review before substitution.

Availability

MAX6316LUK26CY is available at Aetrix Electronics and suitable for portable instrumentation, embedded control systems, intelligent instruments, and battery-powered equipment requiring stable component supply across industrial temperature ranges (-40°C to +125°C).

Supply support for MAX6316LUK26CY 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 power, sensing, interface, and timing applications.

The MAX6316–MAX6322 family delivers compact, factory-trimmed supervisory solutions targeting space-constrained, low-power embedded systems needing reliable power-up, brownout, and software-fault protection.

FAQ

What is the exact reset threshold voltage of MAX6316LUK26CY, and how does it vary with temperature?

The MAX6316LUK26CY has a factory-trimmed nominal reset threshold of 2.6V, specified as VRST = 2.6V ±2.5% over the full operating temperature range (-40°C to +125°C). Its temperature coefficient is 40ppm/°C, meaning drift is bounded and predictable - e.g., at +125°C, deviation remains within the ±2.5% limit. This precision eliminates need for external calibration in MAX6316LUK26CY-based designs.

Does MAX6316LUK26CY support manual reset, and what are the electrical requirements for the MR pin?

Yes, MAX6316LUK26CY supports manual reset via the MR pin (Pin 3). It features an internal 52kΩ pullup resistor, so MR may be left unconnected when unused. To assert reset, drive MR below 0.3×VCC (e.g., < 0.9V at VCC = 3.3V). The pin rejects 100ns transients and accepts TTL/CMOS logic levels - no external debouncing is needed. MAX6316LUK26CY guarantees MR-to-reset propagation delay of ≤230ns at VCC = 5V.

Can MAX6316LUK26CY's RESET output interface directly with a 5V microcontroller when powered from a 3.3V supply?

Yes - MAX6316LUK26CY's open-drain RESET output (Pin 1) is designed for exactly this use case. When powered from 3.3V, connect a pullup resistor (e.g., 10kΩ) from RESET to the 5V domain. The output sinks current only and tolerates up to 6V on the RESET line. This allows MAX6316LUK26CY to drive 5V µP reset inputs without level shifters - a key advantage confirmed in MAX6316LUK26CY's Electrical Characteristics table.

What is the watchdog timeout period of MAX6316LUK26CY, and how is it triggered?

MAX6316LUK26CY has a typical watchdog timeout period of 6.3ms (suffix 'W' per Selector Guide). The watchdog timer resets on any edge (rising or falling) at the WDI pin (Pin 4); failure to toggle WDI within 6.3ms causes RESET assertion. Leaving WDI unconnected disables the watchdog function entirely. Pulse width sensitivity is 50ns, enabling robust detection even with narrow firmware-generated strobes - a verified behavior in MAX6316LUK26CY's datasheet timing diagrams.

Is MAX6316LUK26CY qualified for automotive applications, and what packaging options are available?

No - MAX6316LUK26CY is rated for industrial temperature range (-40°C to +125°C) but is not AEC-Q200 qualified. Automotive variants use the "/V" suffix (e.g., MAX6316LUK26CY/V+T). Packaging is 5-pin SOT23 with lead-free "+T" or leaded "-T" options; MAX6316LUK26CY specifically uses the "-T" suffix, indicating standard leaded packaging. Top marking is "ACDC", per Maxim's Standard Versions table.