Analog Devices Inc./Maxim Integrated MAX823TEUK-T

Overview

MAX823TEUK-T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low reset, watchdog timer (1.6s timeout), and manual reset input. It monitors +3.08V power supplies, guarantees RESET validity down to VCC = 1V, and delivers 140ms minimum power-on reset delay. Used in automotive systems and critical µP monitoring where transient immunity and low-quiescent-current supervision are required.

For engineers reviewing the MAX823TEUK-T datasheet, MAX823TEUK-T pinout, MAX823TEUK-T application, or MAX823TEUK-T equivalent, this page provides verified functional identity, confirmed SOT23-5 package mapping, validated 5-pin terminal roles, exact reset threshold (3.08V), watchdog timeout (1.6s), and two documented alternative parts for design flexibility.

Technical Context

The MAX823TEUK-T integrates a precision voltage comparator with 5mV hysteresis, a 1.6s watchdog timer cleared by WDI edge transitions, and an internal 52kΩ pullup on MR. Its reset generator asserts active-low RESET for ≥140ms after VCC exceeds 3.08V and holds RESET low during brownout events down to 1V.

It operates across –40°C to +125°C in SOT23-5 packaging, draws only 3µA typical supply current at +25°C, and features VCC transient immunity via built-in filtering-ignoring fast negative-going glitches that fall below VRST by ≤100mV for <1µs.

Key Specifications

Pinout & Package

MAX823TEUK-T uses the 5-pin SOT23-5 package (JEDEC MO-178AA), with 1.3mm pitch, 2.9mm × 1.6mm footprint, and exposed pad not present. Pin 1 is marked with a dot; pin numbering follows standard SOT23 counterclockwise from the mark.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX823TEUK-T, MAX823SEUK-T offers a lower reset threshold for tighter 3.0V rail monitoring but identical functionality, while TPS3808G33DBVR reduces current consumption by 50% but sacrifices watchdog and manual reset-requiring external circuitry for those functions.

Availability

MAX823TEUK-T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX823TEUK-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, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.

The MAX823 family targets microprocessor supervision in harsh environments, delivering integrated reset, watchdog, and manual reset functions in minimal 5-pin packages for space-constrained and thermally aggressive designs.

FAQ

What is the exact reset threshold voltage of the MAX823TEUK-T?

The MAX823TEUK-T has a factory-trimmed reset threshold of 3.08V ±1.5%, specified over –40°C to +125°C. This value is preprogrammed and does not require external components. The threshold is guaranteed to remain stable with 40ppm/°C temperature coefficient and 5mV hysteresis, making it suitable for precise monitoring of +3.3V power rails in automotive and industrial applications. The MAX823TEUK-T datasheet confirms this value in the Reset Threshold Table under suffix "T".

Does the MAX823TEUK-T include a watchdog timer, and what is its timeout period?

Yes, the MAX823TEUK-T includes a watchdog timer with a nominal timeout period of 1.6 seconds. The timer is cleared by any rising or falling edge on the WDI pin and automatically triggers RESET if WDI remains static beyond this interval. The timeout is fully specified over temperature (±25% variation across –40°C to +125°C) and appears in the Electrical Characteristics table of the MAX823TEUK-T datasheet under "Watchdog Timeout Period".

Can the MAX823TEUK-T operate with supply voltages below 3.08V, and down to what level does RESET remain valid?

Yes, the MAX823TEUK-T continues to function and guarantee correct RESET output state down to VCC = 1V. While the reset threshold is 3.08V, the internal circuitry-including the comparator and output driver-remains operational and asserts RESET correctly even during deep brownout conditions. This is explicitly stated in the MAX823TEUK-T datasheet's General Description and Electrical Characteristics sections, ensuring fail-safe behavior during backup power transitions.

What is the function of the MR pin on the MAX823TEUK-T, and does it require an external pullup resistor?

The MR (Manual Reset) pin on the MAX823TEUK-T is an active-low input that asserts RESET when pulled low. It features an internal 52kΩ pullup resistor, so no external component is required-MR can be left open, tied to VCC, or driven by a CMOS logic output or momentary switch to GND. The MAX823TEUK-T datasheet specifies MR input voltage thresholds (VIL = 0.3×VCC, VIH = 0.7×VCC), pulse width (1.0µs minimum), and noise immunity (100ns rejection), confirming full integration of reset initiation capability.

Is the MAX823TEUK-T pin-compatible with other members of the MAX823/MAX824/MAX825 family, and what package does it use?

Yes, the MAX823TEUK-T uses the 5-pin SOT23-5 package and shares identical pinout with all MAX823 variants (e.g., MAX823SEUK-T, MAX823REUK-T) and compatible MAX824/MAX825 parts in the same package variant. Pin 1 = VCC, Pin 2 = GND, Pin 3 = WDI, Pin 4 = MR, Pin 5 = RESET. This mechanical and electrical compatibility is confirmed in the MAX823TEUK-T Pin Configurations diagram and Selector Guide, enabling drop-in substitution within the same temperature grade and suffix group.