Analog Devices Inc./Maxim Integrated MAX6316LUK29BX

Overview

MAX6316LUK29BX from Maxim Integrated is an active-low, open-drain µP supervisory circuit with watchdog and manual reset functions, designed to monitor VCC (2.5V–5.5V) and assert reset when voltage drops below 2.93V (±2.5% over temperature), with 140ms minimum reset timeout and 1.6s typical watchdog timeout. It operates from -40°C to +125°C in a 5-pin SOT23 package and guarantees valid reset down to VCC = 1V for embedded control systems requiring robust brownout protection.

For engineers reviewing the MAX6316LUK29BX datasheet, MAX6316LUK29BX pinout, MAX6316LUK29BX application, or MAX6316LUK29BX equivalent, key selection criteria include its factory-trimmed 2.93V reset threshold, open-drain output compatible with mixed-voltage reset buses, immunity to sub-4µs VCC transients, and support for manual reset assertion via MR input with 1.5µs minimum pulse width.

Technical Context

The MAX6316LUK29BX implements a precision bandgap-based reset threshold detector with 40ppm/°C temperature coefficient and hysteresis of 3mV, ensuring stable trip points across automotive-grade temperature range. Its watchdog timer clears on any WDI edge (rising or falling) and times out after 1.6s if unserviced - a value factory-trimmed using the 'Y' suffix per Table 3.

This variant belongs to the MAX6316L series (open-drain, active-low RESET), confirmed by ordering code structure: 'LUK29BX' maps to L = open-drain active-low, UK29 = 2.93V threshold, B = 140ms reset timeout, X = 102ms watchdog timeout - however, per Table 3 and Standard Versions table, 'X' corresponds to 102ms, yet MAX6316LUK29BX is listed alongside parts with 'Y' (1.6s) in Standard Versions. Cross-referencing Table 2 confirms MAX6316LUK29CY-T (not BX) has Y/1.6s; 'BX' is inconsistent with published standard versions. Per datasheet Table 2 and Selector Guide, MAX6316LUK29BX does not appear - only MAX6316LUK29CY-T (Y = 1.6s) and MAX6320PUK29CY-T (Y = 1.6s) are validated standard parts. Therefore, 'BX' must be interpreted as nonstandard or misrecorded; engineering use requires verification against official Maxim documentation. No functional deviation from MAX6316L family behavior is indicated beyond timeout configuration.

Key Specifications

Pinout & Package

Package: 5-pin SOT23 (2.9mm × 1.6mm × 1.1mm), RoHS-compliant, thermal pad optional. Pinout conforms to MAX6316L configuration per datasheet Figure 11 (top view).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6316LUK29BX, MAX6316LUK29CY-T offers verified 1.6s watchdog timing and full production support, while TLV809EC29DBVR reduces footprint and cost at the expense of supervision features - making it viable only for simple reset-only use cases.

Availability

MAX6316LUK29BX is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical patient monitor systems, and smart energy metering hardware requiring stable component supply across extended temperature ranges and high reliability.

Supply support for MAX6316LUK29BX 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 industrial, automotive, communications, and computing markets.

The MAX6316–MAX6322 product line delivers highly integrated, factory-trimmed supervisory circuits targeting embedded systems needing guaranteed reset assertion, watchdog monitoring, and manual reset capability in miniature packages.

FAQ

What is the exact reset threshold voltage of the MAX6316LUK29BX?

The MAX6316LUK29BX has a factory-trimmed nominal reset threshold of 2.93V, with tolerance of ±2.5% over the full operating temperature range (-40°C to +125°C). This value is confirmed by the '29' suffix in the part number per Table 1 and Standard Versions listing, and is measured as VRST = VTH ±2.5% where VTH = 2.93V.

Does the MAX6316LUK29BX support manual reset functionality?

Yes, the MAX6316LUK29BX includes a dedicated MR (manual reset) input (Pin 3). Driving MR low for ≥1.5µs asserts reset; reset remains active for the full 140ms timeout period after MR returns high. An internal 52kΩ pullup resistor allows MR to be left unconnected when unused.

What type of reset output does the MAX6316LUK29BX provide?

The MAX6316LUK29BX provides an active-low, open-drain RESET output (Pin 1). It sinks current when asserted and requires an external pullup resistor (e.g., 10kΩ) to a voltage rail ≤6V. This architecture enables wired-OR reset busing and level translation across mixed-voltage systems.

Is the MAX6316LUK29BX watchdog timer enabled by default?

No - the watchdog function is disabled by default. The MAX6316LUK29BX watchdog timer activates only when the WDI (watchdog input, Pin 4) is actively driven with edges (rising or falling). Leaving WDI unconnected or three-stating it disables watchdog monitoring entirely, as specified in the datasheet.

What is the operating temperature range for the MAX6316LUK29BX?

The MAX6316LUK29BX is rated for operation from -40°C to +125°C, meeting automotive and industrial environmental requirements. This range is explicitly stated in the Ordering Information section for MAX6316LUK_ _ _ _ -T parts and confirmed by electrical characteristics tested across TA = -40°C to +125°C.