Analog Devices Inc./Maxim Integrated MAX6316LUK29CX

Overview

MAX6316LUK29CX from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low open-drain reset output, 2.93V 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 fault conditions in embedded control systems.

For engineers reviewing the MAX6316LUK29CX datasheet, MAX6316LUK29CX pinout, MAX6316LUK29CX application, or MAX6316LUK29CX equivalent, key selection criteria include guaranteed reset validity down to VCC = 1V, immunity to sub-4µs negative VCC transients, bidirectional reset compatibility (not applicable to this variant), and compatibility with 3.3V/5V digital systems requiring low-quiescent-current supervision.

Technical Context

The MAX6316LUK29CX implements a precision voltage monitor using laser-trimmed resistive dividers to set its 2.93V reset threshold with ±2.5% tolerance over -40°C to +125°C. Its watchdog timer clears on any WDI edge and times out after 1.6s if unserviced, triggering a reset that remains asserted for 140ms after VCC recovery or MR release.

This variant features an open-drain RESET output (pin 1), requiring an external pullup resistor to any supply ≤6V. The MR input (pin 3) includes internal 52kΩ pullup and 100ns glitch rejection, while WDI (pin 4) accepts 50ns pulses and draws ≤160µA when high - enabling robust, low-overhead µP activity monitoring in battery-sensitive applications.

Key Specifications

Pinout & Package

Package: 5-pin SOT23 (1.6mm × 2.9mm × 1.1mm), RoHS-compliant, surface-mountable with standard reflow profile.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6316LUK29DZ-T and TLV809EC29DBVR, the MAX6316LUK29CX uniquely delivers balanced 1.6s watchdog responsiveness alongside manual reset and open-drain flexibility - making it optimal for mid-complexity embedded systems needing both power integrity and software health monitoring without design compromises.

Availability

MAX6316LUK29CX is available at Aetrix Electronics and suitable for portable instrumentation, industrial controllers, intelligent sensors, and battery-powered embedded systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6316LUK29CX 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, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.

The MAX6316–MAX6322 family targets space-constrained embedded systems requiring reliable power-on reset, brownout protection, and software watchdog supervision - with variants optimized for push/pull, open-drain, bidirectional, and active-high reset topologies.

FAQ

What is the exact reset threshold voltage of the MAX6316LUK29CX and how tightly is it specified?

The MAX6316LUK29CX has a factory-trimmed nominal reset threshold of 2.93V, with guaranteed tolerance of ±2.5% over the full operating temperature range (-40°C to +125°C). This specification is confirmed in Table 1 and Electrical Characteristics section of the official Maxim datasheet, ensuring predictable brownout response without external calibration.

Does the MAX6316LUK29CX support manual reset functionality, and how is the MR pin configured?

Yes, the MAX6316LUK29CX supports manual reset via pin 3 (MR). The MR input is active-low, internally pulled up to VCC through a 52kΩ resistor, and features 100ns glitch rejection. Pulling MR low forces a reset that remains asserted for the full 140ms timeout period after MR returns high - enabling simple pushbutton reset without external components.

What type of reset output does the MAX6316LUK29CX provide, and what external components are required?

The MAX6316LUK29CX provides an active-low open-drain RESET output (pin 1). It requires an external pullup resistor to a logic-compatible supply (≤6V); a 10kΩ resistor is sufficient in most applications. This architecture allows level-shifting and wired-OR reset bus configurations not possible with push/pull outputs.

How does the watchdog timer in the MAX6316LUK29CX operate, and what is its timeout period?

The MAX6316LUK29CX watchdog timer clears on any rising or falling edge at the WDI pin (pin 4) and times out after 1.6s (typical) if unserviced. Upon timeout, it asserts RESET for 140ms. The timer is disabled when WDI is left unconnected or driven three-state - verified in the Selector Guide and Electrical Characteristics tables.

Is the MAX6316LUK29CX guaranteed to function correctly at very low supply voltages, and down to what level?

Yes, the MAX6316LUK29CX is guaranteed to assert a valid reset signal down to VCC = 1.0V, as explicitly stated in the General Description and Electrical Characteristics sections. This ensures fail-safe behavior during severe brownout conditions where other supervisors may lose output drive capability.