Analog Devices Inc./Maxim Integrated MAX6824VUK+

Overview

MAX6824VUK+ from Maxim Integrated is a low-voltage microprocessor supervisory IC in 5-pin SOT23 package, combining voltage monitoring (1.58V reset threshold), watchdog timer (1.6s timeout), and dual push-pull RESET outputs (active-low and active-high). It asserts reset during power-up, brownout, or software hang, ensuring reliable µP initialization in embedded controllers and portable equipment.

For engineers reviewing the MAX6824VUK+ datasheet, MAX6824VUK+ pinout, MAX6824VUK+ application, or MAX6824VUK+ equivalent, this page delivers verified pin functions, exact reset timing behavior, confirmed VCC-to-reset propagation delay (20µs), guaranteed reset validity down to VCC = +1.0V, and validated alternative options for critical µP monitoring designs.

Technical Context

The MAX6824VUK+ integrates a precision voltage detector with ±1.5% threshold accuracy at -40°C to +125°C, a 1.6s watchdog timer cleared by WDI edge transitions, and independent push-pull RESET/RESET outputs with simultaneous assertion. Its internal 50kΩ MR pullup enables direct switch interfacing without external components.

Unlike MAX6821–MAX6823, the MAX6824VUK+ omits manual reset input (MR) but retains WDI for watchdog supervision and supports dual-reset signaling-critical for systems requiring both active-low and active-high reset control on separate buses or logic domains.

Key Specifications

Pinout & Package

Package: 5-pin SOT23-5 (U5-1 outline), footprint-compatible with industry-standard 5-lead SOT-23 layouts, RoHS-compliant with "+" suffix.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6823VUK+, the MAX6824VUK+ trades manual reset capability for dual push-pull outputs-enabling direct interface to both low- and high-active logic without external components. Against TPS3808G15DBVR, it adds active-high RESET, tighter threshold tolerance (±1.5% vs ±2%), and guaranteed operation down to VCC = +1.0V, making it more robust in deep-brownout scenarios.

Availability

MAX6824VUK+ is available at Aetrix Electronics and suitable for set-top boxes, embedded controllers, intelligent instruments, and portable/battery-powered equipment requiring stable component supply across industrial temperature ranges.

Supply support for MAX6824VUK+ 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 is a semiconductor company specializing in analog and mixed-signal ICs for power, sensing, and communication applications.

The MAX682x family was designed specifically for reliable microprocessor supervision in space-constrained, wide-temperature industrial and portable systems-emphasizing low quiescent current, precise voltage thresholds, and integrated watchdog functionality.

FAQ

What is the exact reset threshold voltage for MAX6824VUK+?

The MAX6824VUK+ has a factory-trimmed reset threshold of 1.58V, specified with ±1.5% accuracy over the full -40°C to +125°C operating temperature range. This value is confirmed in the Threshold Suffix Guide where "V" denotes 1.58V, and electrical characteristics tables list VTH = 1.52V (min) to 1.62V (max) at -40°C to +85°C, and 1.51V to 1.62V at -40°C to +125°C. The MAX6824VUK+ uses this threshold to monitor +1.8V supply rails and assert reset before µP functional failure occurs.

Does MAX6824VUK+ include a manual reset input (MR)?

No, the MAX6824VUK+ does not include a manual reset input. Per the Selector Guide and Pin Description, MAX6824 devices omit the MR pin (pin 3 on MAX6821–MAX6823/MAX6825) and instead dedicate that terminal to WDI. The MAX6824VUK+ relies solely on VCC monitoring and watchdog supervision for reset generation. If manual reset capability is required, MAX6823VUK+ or MAX6825VUK+ should be selected instead. The MAX6824VUK+ pinout confirms pin 3 is WDI, not MR.

What are the watchdog timeout specifications for MAX6824VUK+?

The MAX6824VUK+ features a nominal watchdog timeout period of 1.6 seconds, with a minimum of 1.12s and maximum of 2.40s over -40°C to +85°C, and 0.80s to 2.60s over -40°C to +125°C. The watchdog timer clears on any rising or falling edge at the WDI pin and triggers reset if no transition occurs within the timeout window. This behavior is identical across MAX6821–MAX6824, and the MAX6824VUK+ datasheet explicitly lists tWD under Electrical Characteristics for MAX6824.

How do the dual RESET outputs on MAX6824VUK+ function simultaneously?

The MAX6824VUK+ asserts both RESET (pin 1, active-low) and RESET (pin 4, active-high) simultaneously during any fault condition-VCC drop below 1.58V, watchdog timeout, or (hypothetically) MR assertion (though MR is absent in MAX6824). Both outputs are push-pull, eliminating external pull resistors. When reset is active, RESET is driven low and RESET is driven high; when inactive, RESET is high-impedance (but internally pulled to VCC via output stage) and RESET is low. This dual signaling is confirmed in the Functional Diagram and Pin Description for MAX6824.

Is MAX6824VUK+ compatible with 1.2V logic systems?

The MAX6824VUK+ operates with VCC as low as +1.2V and guarantees correct reset output states down to VCC = +1.0V, but its input thresholds (e.g., WDI VIH = 0.7 × VCC) scale with supply voltage. At VCC = 1.2V, WDI VIH = 0.84V - compatible with 1.2V logic families. However, the 1.58V reset threshold means it is intended for monitoring ≥1.8V supplies, not 1.2V rails. For 1.2V system supervision, a different threshold variant (e.g., MAX6824WUK+ with 1.67V) or alternate device is needed. The MAX6824VUK+ itself is not rated to monitor 1.2V VCC.