Analog Devices Inc./Maxim Integrated MAX6318LHUK26AY

Overview

MAX6318LHUK26AY from Maxim Integrated is an active-low, push/pull µP supervisory circuit with watchdog and manual reset functions, designed for power supply monitoring and microprocessor reset control in embedded systems. It features a factory-trimmed 2.6V reset threshold (±2.5%), 140ms minimum reset timeout, 102ms typical watchdog timeout, and guaranteed reset validity down to VCC = 1V. Used in portable instrumentation and battery-powered controllers requiring reliable brownout protection.

For engineers reviewing the MAX6318LHUK26AY datasheet, MAX6318LHUK26AY pinout, MAX6318LHUK26AY application, or MAX6318LHUK26AY equivalent, key selection criteria include its SOT23-5 package, bidirectional-compatible active-low push/pull reset output, 102ms watchdog period, 2.6V threshold tolerance, and -40°C to +125°C operating range - all critical for industrial and automotive-grade system reliability validation.

Technical Context

The MAX6318LHUK26AY integrates a precision voltage detector, programmable reset timer, and edge-sensitive watchdog timer that clears on rising or falling transitions at WDI. Its reset generator asserts active-low RESET when VCC falls below 2.6V, MR is pulled low, or WDI remains static beyond 102ms.

This variant belongs to the MAX6318_H series: it provides active-low push/pull RESET output (not open-drain or bidirectional), includes manual reset input with internal 52kΩ pullup, and supports watchdog disable via WDI floating. Reset deasserts after 140ms once VCC rises above threshold and remains valid down to 1V supply.

Key Specifications

Pinout & Package

MAX6318LHUK26AY is housed in a 5-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), surface-mount, lead-free compliant, with thermal pad not connected internally.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6318MHUK26AY, the MAX6318LHUK26AY provides direct push/pull drive without external pullup complexity; compared with TLV803EB26DBVR, it adds critical runtime fault detection via watchdog and field-serviceable reset via MR - essential for autonomous embedded systems.

Availability

MAX6318LHUK26AY is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered controllers, industrial motor drives, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6318LHUK26AY 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, communications, and computing applications, with emphasis on high-reliability, low-power, and small-footprint solutions.

The MAX6318LHUK26AY belongs to the MAX6316–MAX6322 family of µP supervisory circuits engineered specifically for robust power monitoring and fault recovery in harsh-environment embedded systems - prioritizing accuracy, temperature stability, and integration.

FAQ

What is the exact reset threshold voltage of MAX6318LHUK26AY?

The MAX6318LHUK26AY has a factory-trimmed nominal reset threshold of 2.6V, with guaranteed tolerance of ±2.5% over the full -40°C to +125°C temperature range. This value is confirmed in Table 1 of the official Maxim datasheet and corresponds to the "26" suffix in the part number, indicating the 2.6V threshold variant.

Does MAX6318LHUK26AY include a watchdog timer, and what is its timeout period?

Yes, MAX6318LHUK26AY includes a watchdog timer with a typical timeout period of 102ms, corresponding to the "X" suffix in its ordering code. The timer clears on any rising or falling edge at the WDI pin and asserts RESET if no transition occurs within that interval - verified in the Electrical Characteristics table and Selector Guide.

What type of reset output does MAX6318LHUK26AY provide, and how is it driven?

MAX6318LHUK26AY provides an active-low, push/pull CMOS reset output (pin 5). It actively sources and sinks current - capable of driving low to ≤0.3V at 1.2mA and high to ≥0.8×VCC - eliminating need for external pullup resistors. This is explicitly defined in the Pin Description and Electrical Characteristics sections for the "LH" variant.

Can MAX6318LHUK26AY operate reliably during deep brownout conditions?

Yes, MAX6318LHUK26AY guarantees valid reset output behavior down to VCC = 1.0V, as stated in Absolute Maximum Ratings and Electrical Characteristics. Its internal circuitry remains functional and RESET remains asserted or deasserted correctly even as supply voltage collapses - a key differentiator for battery-fail-safe designs.

Is manual reset (MR) supported on MAX6318LHUK26AY, and what are its electrical characteristics?

Yes, MAX6318LHUK26AY includes a manual reset input (pin 3) with internal 52kΩ pullup to VCC. MR is active-low, requires ≥1.5µs pulse width at full temperature range, and rejects 100ns glitches. Driving MR low forces RESET assertion for the full 140ms timeout - confirmed in Pin Description and Electrical Characteristics tables.