Analog Devices Inc./Maxim Integrated MAX825TEXK-T

Overview

MAX825TEXK-T from Maxim Integrated is a 5-pin microprocessor supervisory circuit with manual reset input and complementary active-high reset output, designed for precision monitoring of +3.08V power supplies in embedded systems. It guarantees valid reset assertion down to VCC = 1V, features 140ms minimum power-on reset timeout, 2µA supply current (SC70 package), and immunity to fast VCC transients - deployed in battery-powered instrumentation and automotive control units.

For engineers reviewing the MAX825TEXK-T datasheet, MAX825TEXK-T pinout, MAX825TEXK-T application, or MAX825TEXK-T equivalent, this page delivers verified functional identity, confirmed SC70-5 package mapping, validated terminal roles, exact reset threshold (3.08V), and two technically documented alternative parts for system-level reliability design.

Technical Context

The MAX825TEXK-T implements a precision voltage comparator with 5mV hysteresis and 40ppm/°C temperature coefficient to monitor VCC against a factory-trimmed 3.08V threshold. Its internal reset timer ensures ≥140ms assertion after VCC rise or MR deassertion, while the complementary RESET output provides active-high logic compatible with µP reset inputs requiring high-true signaling.

Unlike the MAX823/MAX824 variants, the MAX825TEXK-T excludes watchdog functionality but integrates a manual reset input (MR) with 52kΩ internal pullup, enabling direct switch or CMOS-level triggering without external components - supporting robust field-service and test-mode reset initiation in industrial controllers.

Key Specifications

Pinout & Package

MAX825TEXK-T is housed in a lead-free SC70-5 surface-mount package (2.0mm × 1.25mm footprint, 0.95mm height), optimized for automated assembly and thermal performance in compact industrial sensors.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX825TEXK-T, MAX825TEUK-T extends temperature capability without altering electrical behavior, while TPS3808G30DBVR trades dual-output flexibility and transient immunity for lower price and marginally lower quiescent current - making MAX825TEXK-T optimal for space-constrained, dual-signaling industrial controls.

Availability

MAX825TEXK-T is available at Aetrix Electronics and suitable for industrial PLCs, automotive body controllers, and portable medical sensors requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX825TEXK-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 demanding industrial, automotive, and communications applications.

The MAX823/MAX824/MAX825 family delivers integrated power-supply supervision with reset, watchdog, and manual reset functions - engineered specifically for reliability-critical embedded systems where deterministic startup and fault recovery are mandatory.

FAQ

What is the exact reset threshold voltage for MAX825TEXK-T?

The MAX825TEXK-T has a factory-trimmed reset threshold of 3.08V, specified as 3.04V (min) to 3.11V (max) over the full -40°C to +85°C operating temperature range. This value is confirmed in the Reset Threshold Table of the official datasheet and applies exclusively to the "T" suffix variant in SC70-5 packaging. The MAX825TEXK-T uses this precise threshold to monitor 3.3V power rails without external calibration components.

Does MAX825TEXK-T include a watchdog timer function?

No, the MAX825TEXK-T does not include a watchdog timer. Per the Selector Guide and Functional Diagram, only the MAX823 and MAX824 variants feature WDI (Watchdog Input); the MAX825 series provides manual reset input (MR) and complementary reset outputs (RESET and RESET) instead. This functional distinction is hard-coded in the silicon design and cannot be enabled via configuration - confirming MAX825TEXK-T as a manual-reset-only supervisory device.

What package type and dimensions does MAX825TEXK-T use?

The MAX825TEXK-T is supplied in a 5-pin SC70 package (also labeled SC70-5), measuring 2.0mm × 1.25mm × 0.95mm with a 0.65mm pin pitch. This is explicitly stated in the Ordering Information table and verified in the Package Information section. The "XK" suffix in the part number denotes SC70 packaging, distinguishing it from the SOT23-5 variant (EUK). No other package options exist for the MAX825TEXK-T.

How does the manual reset input (MR) behave on MAX825TEXK-T?

On the MAX825TEXK-T, the MR pin is an active-low input with 0.3×VCC VIL and 0.7×VCC VIH thresholds, featuring a 52kΩ internal pullup resistor. A logic-low pulse ≥1.0µs asserts both RESET outputs for ≥140ms, and reset remains active for the full timeout period after MR returns high. This behavior is documented in the Pin Description and Detailed Description sections, and no external pullup is required - simplifying PCB layout for pushbutton or GPIO-driven reset circuits.

Is MAX825TEXK-T compatible with bidirectional microprocessor reset pins?

Yes, the MAX825TEXK-T RESET output can interface with bidirectional µP reset pins (e.g., 68HC11, certain STM32 models) because it sinks up to 1.2mA at VOL ≤0.3V while limiting source current to 400µA - allowing the µP to override the supervisor's high state when needed. This capability is explicitly detailed in the "Interfacing to µPs with Bidirectional Reset Pins" application note and confirmed in the Electrical Characteristics table under RESET Output Short-Circuit Current.