Analog Devices Inc./Maxim Integrated MAX824TEXK-T

Overview

MAX824TEXK-T from Maxim Integrated is a 5-pin SC70-packaged microprocessor supervisory circuit with active-low watchdog input and complementary active-high reset output, designed for reliable power-on/brownout monitoring of +3.08V supplies. It guarantees RESET validity down to VCC = 1V, delivers 140ms minimum reset timeout, and provides 1.6s watchdog timeout - used in embedded controllers and portable equipment requiring robust µP reset supervision.

For engineers reviewing the MAX824TEXK-T datasheet, MAX824TEXK-T pinout, MAX824TEXK-T application, or MAX824TEXK-T equivalent, key selection criteria include its 3.08V reset threshold, SC70-5 package, watchdog timer compatibility, and complementary reset outputs for interfacing with bidirectional µP reset pins.

Technical Context

The MAX824TEXK-T integrates a precision voltage monitor, watchdog timer, and dual-reset output stage (RESET and RESET) in a single BiCMOS IC. Its reset comparator features 5mV hysteresis and 40ppm/°C temperature coefficient, ensuring stable trip points across -40°C to +85°C.

Watchdog functionality clears on any WDI edge (≥50ns pulse width) and times out after 1.12–2.40s; the internal timer restarts upon reset assertion or WDI transition. RESET remains asserted for ≥200ms after VCC recovery, MR release, or watchdog timeout - independent of supply voltage down to 1V.

Key Specifications

Pinout & Package

MAX824TEXK-T is housed in a 5-pin SC70-5 package (2.0mm × 2.1mm, 0.65mm pitch), optimized for space-constrained PCB layouts in portable and IoT devices.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX824TEXK-T, the MAX824TEUK-T offers identical supervision features in a thermally robust SOT23 package for high-temp environments, while the TPS3808G30DBVR provides lower-cost basic reset functionality without watchdog or complementary outputs - limiting its use to non-safety-critical applications.

Availability

MAX824TEXK-T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, and smart energy meters requiring stable component supply, long-term lifecycle support, and lead-free compliance.

Supply support for MAX824TEXK-T 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, and computing applications - emphasizing reliability, low power, and integration.

The MAX823/MAX824/MAX825 family targets cost-sensitive, space-constrained embedded systems needing integrated reset, watchdog, and manual reset functions without external components.

FAQ

What is the exact reset threshold voltage for MAX824TEXK-T?

The MAX824TEXK-T has a factory-trimmed reset threshold of 3.08V, with guaranteed limits of 3.04V (min) and 3.11V (max) over the full -40°C to +85°C temperature range. This value is confirmed in the Reset Threshold Table of the official datasheet and applies specifically to the "T" suffix variant in SC70 packaging. The MAX824TEXK-T uses this precise threshold to supervise +3.3V power rails while accommodating typical tolerance and ripple.

Does MAX824TEXK-T provide both active-low and active-high reset outputs?

Yes, the MAX824TEXK-T provides complementary reset outputs: pin 1 (RESET) is active-low, and pin 4 (RESET) is active-high - both asserted simultaneously during power-up, brownout, or watchdog timeout. This dual-output architecture allows direct interface with microprocessors requiring either polarity without external inverters. The MAX824TEXK-T is explicitly differentiated from the MAX823 and MAX825 by this feature per the Selector Guide.

What is the watchdog timeout period for MAX824TEXK-T, and how is it cleared?

The MAX824TEXK-T watchdog timeout is 1.60s (typical), with a guaranteed range of 1.12s to 2.40s over temperature. It is cleared by any rising or falling edge on the WDI pin (pin 3), including pulses as narrow as 50ns. The timer also resets automatically when RESET is asserted. If WDI is left unconnected, the internal driver toggles it every ~1.4s to prevent timeout - making the watchdog function optional and configurable in the MAX824TEXK-T.

Can MAX824TEXK-T operate reliably when VCC drops below 2.0V?

Yes, the MAX824TEXK-T guarantees correct RESET output state down to VCC = 1.0V, as explicitly stated in the General Description and Electrical Characteristics. Its internal circuitry remains functional and asserts reset even during deep brownout conditions - critical for fail-safe operation in battery-powered systems. This specification is validated across the full -40°C to +85°C range and applies directly to the MAX824TEXK-T in SC70 packaging.

What package type and dimensions does MAX824TEXK-T use?

The MAX824TEXK-T uses the SC70-5 package: 2.0mm × 2.1mm body size, 0.65mm lead pitch, and 0.9mm maximum height. This compact outline is confirmed in the Package Information section and Ordering Information table, where "EXK-T" denotes SC70-5 with -40°C to +85°C operation. The MAX824TEXK-T's SC70 footprint enables high-density PCB layouts in portable and IoT applications where board space is constrained.