Analog Devices Inc./Maxim Integrated MAX6316LUK46BX

Overview

MAX6316LUK46BX from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low open-drain reset output, 4.63V factory-trimmed reset threshold, 140ms minimum reset timeout, and 1.6s typical watchdog timeout. It monitors VCC supply integrity, provides manual reset input, and asserts reset during brownout, software hang, or external reset request - used in embedded controllers and portable instrumentation.

For engineers reviewing the MAX6316LUK46BX datasheet, MAX6316LUK46BX pinout, MAX6316LUK46BX application, or MAX6316LUK46BX equivalent, key selection criteria include guaranteed reset validity down to VCC = 1V, immunity to sub-4µs negative VCC transients, bidirectional reset compatibility (not applicable here), and precise 4.63V threshold tolerance of ±2.5% over -40°C to +125°C.

Technical Context

The MAX6316LUK46BX implements a precision voltage-monitoring comparator with 40ppm/°C temperature coefficient and hysteresis of 3mV, triggering reset when VCC falls below 4.63V. Its watchdog timer clears on any WDI edge (rising or falling) and times out after 1.6s if unserviced - independent of VCC level as long as VCC ≥ 1.0V.

Reset assertion persists for 140ms after VCC rises above 4.63V or after MR transitions high; the open-drain RESET output sinks up to 3.2mA at VCC ≥ 4.5V with VOL ≤ 0.4V, requiring an external pullup resistor to any supply ≤ 6V. MR input includes 52kΩ internal pullup and rejects 100ns glitches.

Key Specifications

Pinout & Package

MAX6316LUK46BX is housed in a 5-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), RoHS-compliant, with gull-wing leads and thermal pad not connected internally.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6316LUK46BX, MAX6316LUK46D-T offers simpler drive capability but forfeits bus-sharing flexibility, while TPS3808G33DBVR trades threshold precision and feature set for lower unit cost in fixed-rail applications - neither is pin-compatible or drop-in replaceable.

Availability

MAX6316LUK46BX is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6316LUK46BX 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 computing applications, emphasizing reliability, integration, and performance under harsh conditions.

The MAX6316–MAX6322 family delivers highly configurable µP supervision with factory-trimmed thresholds, selectable timeouts, and multiple reset output architectures - engineered for robustness in battery-powered, automotive, and mission-critical embedded systems.

FAQ

What is the exact reset threshold voltage of MAX6316LUK46BX and how tightly is it specified?

The MAX6316LUK46BX has a factory-trimmed reset threshold of 4.63V, specified as VRST = VTH ±2.5% over the full operating temperature range of -40°C to +125°C. This means the actual trip point falls between 4.514V and 4.746V at temperature extremes, with tighter tolerance (±1.5%) at +25°C. The 40ppm/°C temperature coefficient ensures minimal drift across ambient changes.

Does MAX6316LUK46BX support manual reset functionality, and how is the MR pin configured?

Yes, MAX6316LUK46BX includes a manual reset (MR) input on Pin 3. It is internally pulled up to VCC via a 52kΩ resistor, so it can be left unconnected when unused. Driving MR low forces an immediate reset, which remains asserted for the full 140ms timeout after MR returns high. The pin rejects 100ns glitches and accepts TTL/CMOS logic levels depending on VCC.

What type of reset output does MAX6316LUK46BX provide, and what external components are required?

MAX6316LUK46BX features an active-low open-drain RESET output on Pin 4. It requires an external pullup resistor to a supply voltage ≤ 6V - typically 4.7kΩ to 10kΩ - to establish a valid high state. This architecture enables wired-OR connections and level translation across mixed-voltage systems, unlike push/pull variants that drive both logic states internally.

How does the watchdog timer in MAX6316LUK46BX operate, and what is its timeout value?

The MAX6316LUK46BX watchdog timer has a typical timeout of 1.6s (corresponding to suffix 'Y'). It clears on any rising or falling edge at the WDI pin (Pin 2) and asserts reset if unserviced for the full period. When WDI is left unconnected, the timer is internally serviced every ~1.4s (7/8 of 1.6s), effectively disabling watchdog action without external circuitry.

Is MAX6316LUK46BX guaranteed to function correctly at very low supply voltages, and down to what level?

Yes, MAX6316LUK46BX is guaranteed to assert a valid reset signal down to VCC = 1.0V. Its internal circuitry remains functional and the RESET output maintains specified VOL ≤ 0.4V (at ISINK = 3.2mA) even at this low voltage, ensuring reliable reset generation during deep brownout conditions where many competing supervisors fail.