Analog Devices Inc./Maxim Integrated MAX6824LUK

Overview

The MAX6824LUK from Maxim Integrated is a low-voltage microprocessor supervisory IC in a 5-pin SOT23 package, combining voltage monitoring, watchdog timer, and dual push-pull reset outputs (RESET and RESET). It monitors VCC from +1.8V to +5.0V with a factory-programmed 2.93V reset threshold (suffix 'S'), asserts reset for ≥140ms after VCC recovery, features a 1.6s watchdog timeout, and guarantees valid reset operation down to VCC = +1.0V. It is used in embedded controllers and portable equipment requiring reliable power-on reset and software fault detection.

For engineers reviewing the MAX6824LUK datasheet, MAX6824LUK pinout, MAX6824LUK application, or MAX6824LUK equivalent, this device serves as a compact, single-chip solution for dual-polarity reset generation, brownout protection, and watchdog supervision in space-constrained industrial and battery-powered systems.

Technical Context

The MAX6824LUK integrates a precision voltage comparator with 60ppm/°C temperature coefficient, a monostable reset timeout circuit with 140ms minimum delay, and an independent watchdog timer that clears on any WDI edge and times out after 1.6s if unrefreshed. Its dual push-pull outputs drive active-low and active-high reset lines simultaneously without external pullups.

It operates across -40°C to +125°C, supports VCC as low as +1.0V for guaranteed reset assertion, and includes internal 50kΩ MR pullup and glitch rejection on manual reset input. The watchdog input accepts pulses as short as 50ns and disables automatically when left floating or three-stated.

Key Specifications

Pinout & Package

MAX6824LUK is housed in a standard 5-pin SOT23-5 package (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6824LUK, MAX6822UKT adds manual reset but sacrifices the active-high RESET output and requires external pullup, while MAX6316LUT45D3+ offers higher threshold and lower cost but omits watchdog and dual-reset functionality - making MAX6824LUK uniquely suited for compact, dual-signaling, fault-tolerant µP supervision.

Availability

MAX6824LUK is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, and automotive body control modules requiring stable component supply, long-term lifecycle support, and guaranteed performance across extended temperature ranges.

Supply support for MAX6824LUK 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, and computing applications, with emphasis on high-reliability, low-power, and small-footprint solutions.

The MAX6821–MAX6825 family was engineered specifically for space-constrained microprocessor-based systems needing integrated voltage monitoring, watchdog supervision, and flexible reset signaling - eliminating discrete supervisors and timing components.

FAQ

What is the factory-programmed reset threshold voltage for MAX6824LUK?

The MAX6824LUK has a factory-programmed reset threshold of 2.93V ('S' suffix), with tolerance of ±70mV over -40°C to +125°C. This value is laser-trimmed during production and specified in the Electrical Characteristics table under VTH for MAX682_S. The threshold remains stable with 60ppm/°C temperature coefficient, ensuring predictable brownout response in +3.3V systems.

Does MAX6824LUK include a manual reset input (MR)?

No, the MAX6824LUK does not include a manual reset input. Per the Selector Guide and Pin Description table, MAX6824 supports watchdog input (WDI) and dual push-pull reset outputs (RESET and RESET), but omits MR functionality. This distinguishes it from MAX6821/MAX6822/MAX6823/MAX6825, which all include MR. The absence of MR simplifies routing and removes unused pin-related design considerations.

How does the watchdog timer in MAX6824LUK operate, and what triggers it?

The MAX6824LUK watchdog timer times out after 1.6s (nominal) if no edge (rising or falling) is detected on the WDI pin. It clears on any WDI transition, reset assertion, or MR event (though MR is absent in MAX6824LUK). The timer is disabled when WDI is left floating or three-stated, as internal circuitry then services it every ~1.4s. Pulses as short as 50ns are recognized, enabling low-overhead firmware heartbeat implementation.

What are the electrical characteristics of the two reset outputs on MAX6824LUK?

MAX6824LUK provides two independent push-pull outputs: RESET (active-low) and RESET (active-high). RESET sinks ≥1.2mA at VCC ≥ 2.55V with VOL ≤ 0.3V; RESET sources ≥500µA at VCC ≥ 3.15V with VOH ≥ 0.8×VCC. Both outputs remain valid down to VCC = +1.0V, and neither requires external pull resistors - enabling direct interface to diverse µP reset inputs including bidirectional and level-sensitive types.

Is MAX6824LUK compatible with lead-free soldering processes?

Yes, MAX6824LUK is available in lead-free packaging. Per the Ordering Information section, lead-free versions are denoted by replacing "-T" with "+T" in the part number (e.g., MAX6824LUK+T). The device meets JEDEC J-STD-020 moisture sensitivity level (MSL) requirements and supports standard reflow profiles, including peak temperatures up to +260°C for 10 seconds, as validated in Maxim's package qualification testing.