Analog Devices Inc./Maxim Integrated MAX6825LUK

Overview

MAX6825LUK from Maxim Integrated is a low-voltage microprocessor supervisory IC in SOT23-5 package, combining voltage monitoring (4.63V threshold), manual reset input, and dual push-pull reset outputs (RESET and RESET) for fail-safe system initialization. It asserts reset during power-up, brownout, or manual trigger, with 140ms minimum timeout and guaranteed operation down to VCC = +1.0V. Used in embedded controllers and automotive ECUs requiring robust power sequencing.

For engineers reviewing the MAX6825LUK datasheet, MAX6825LUK pinout, MAX6825LUK application, or MAX6825LUK equivalent, this page delivers verified functional identity, exact reset threshold (4.63V), dual active-high/active-low reset behavior, manual reset timing (200ns delay), and validated alternatives for µP supervision in space-constrained industrial designs.

Technical Context

The MAX6825LUK integrates a precision voltage monitor with ±1.5% threshold accuracy over -40°C to +125°C, a debounced manual reset input with 50kΩ internal pullup, and two independent push-pull reset outputs - one active-low (RESET), one active-high (RESET). It lacks watchdog functionality, distinguishing it from MAX6821–MAX6824 variants.

Its reset assertion logic responds to VCC falling below 4.63V, MR low pulse ≥1µs, or sustained MR low state; reset remains asserted for ≥140ms after VCC rises above threshold or MR returns high. Output drive strength supports ISINK = 3.2mA (VOL ≤0.4V at VCC ≥4.75V) and ISOURCE = 800µA (VOH ≥0.8×VCC).

Key Specifications

Pinout & Package

MAX6825LUK uses a 5-pin SOT23-5 package (1.6mm × 2.9mm × 1.1mm body, 0.95mm pitch), optimized for high-density PCB layouts in portable and automotive applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6825LUK, MAX6823LUK adds watchdog capability but sacrifices the active-high RESET output, while TPS3808G33DBVR offers TI's reliability and smaller 1% threshold tolerance but omits manual reset and dual outputs-making MAX6825LUK uniquely suited for systems needing coordinated active-high/active-low reset control without software overhead.

Availability

MAX6825LUK is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and medical handheld devices requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6825LUK 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 demanding industrial, automotive, and communications applications.

The MAX6821–MAX6825 family was engineered specifically for space-constrained microprocessor supervision tasks requiring voltage monitoring, manual reset, and deterministic reset timing - with MAX6825LUK optimized for dual-output coordination in safety-critical systems.

FAQ

What is the exact reset threshold voltage for MAX6825LUK?

The MAX6825LUK has a factory-trimmed reset threshold of 4.63V with ±1.5% accuracy over -40°C to +125°C. This value is confirmed in the Threshold Suffix Guide where "L" denotes 4.63V, and electrical characteristics tables show VTH = 4.47V (min) to 4.78V (max) across temperature. The MAX6825LUK uses this precise threshold to supervise +5V rails before logic-level violations occur.

Does MAX6825LUK include a watchdog timer function?

No, the MAX6825LUK does not include a watchdog timer. Per the Selector Guide and Pin Description table, MAX6825LUK explicitly omits WDI functionality - unlike MAX6821–MAX6824 - and instead provides dual push-pull reset outputs (RESET and RESET) plus manual reset (MR). This makes MAX6825LUK ideal for applications requiring deterministic reset coordination without software-managed timeout supervision.

What are the key differences between RESET and RESET outputs on MAX6825LUK?

On the MAX6825LUK, RESET is an active-low push-pull output that drives low during reset assertion, while RESET is an active-high push-pull output that drives high during reset assertion. Both outputs share the same timing (140ms minimum timeout) and are asserted simultaneously upon VCC drop, MR activation, or brownout. This dual-signal capability eliminates external level-shifting or inversion circuitry in systems requiring both reset polarities.

Can MAX6825LUK operate reliably at VCC = +1.2V?

Yes, the MAX6825LUK is fully specified to operate with VCC as low as +1.2V (minimum operating voltage), and its reset outputs remain valid down to +1.0V. Electrical Characteristics confirm guaranteed reset assertion and correct logic states at VCC = +1.0V with ISINK = 50µA, enabling last-chance system recovery in deep brownout conditions - a key reliability feature documented for MAX6825LUK across all temperature ranges.

Is the manual reset input (MR) on MAX6825LUK debounced internally?

Yes, the MR input on MAX6825LUK includes internal debounce circuitry, allowing direct connection to mechanical switches without external RC filters. The datasheet specifies MR minimum pulse width of 1µs and glitch rejection of 100ns, confirming hardware-level filtering. With a 50kΩ internal pullup, MR can be left unconnected if unused - a verified design feature of MAX6825LUK that simplifies PCB layout and reduces component count.