Analog Devices Inc./Maxim Integrated MXD1817XR29

Overview

MXD1817XR29 from Maxim Integrated is a low-power microprocessor reset supervisor IC designed for +2.5V/+3.0V/+3.3V digital systems. It provides active-high push-pull RESET output, 2.88V ±2.5% factory-trimmed reset threshold, 100ms minimum reset timeout, and operates from -40°C to +105°C in SC70-3 package - used to ensure reliable power-on initialization in portable microcontroller-based equipment.

For engineers reviewing the MXD1817XR29 datasheet, MXD1817XR29 pinout, MXD1817XR29 application, or MXD1817XR29 equivalent, key selection criteria include its active-high reset logic, guaranteed RESET validity down to VCC = +1V, immunity to fast VCC transients, and compatibility with battery-powered systems requiring ultra-low ICC (4µA typical).

Technical Context

The MXD1817XR29 integrates a precision voltage comparator with hysteresis and an internal timer to assert RESET when VCC falls below 2.88V and hold it active for ≥100ms after VCC rises above threshold. Its push-pull output drives high actively without external pullup, enabling direct interface to µP reset inputs requiring active-high assertion.

Unlike open-drain variants, MXD1817XR29 lacks manual-reset detection and debouncing circuitry - confirming it is not functionally equivalent to MXD1818XR29. It shares BiCMOS process technology and SC70-3 footprint with the full MXD181x family but is specifically configured for 2.88V monitoring in 3.3V systems.

Key Specifications

Pinout & Package

MXD1817XR29 is housed in a 3-pin SC70 package (outline X3-2), with 0.65mm pitch and moisture sensitivity level (MSL) 1. Pin 1 is RESET (active-high push-pull), Pin 2 is VCC (supply and threshold monitor input), and Pin 3 is GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MXD1817XR29, MAX809TRD3-T demands external pullup and asserts reset low, limiting direct substitution in active-high designs; TPS3808G18DBVR offers adjustability but increases board area and power budget - MXD1817XR29 delivers optimal fit for fixed 2.88V, active-high, ultra-low-power SC70 applications.

Availability

MXD1817XR29 is available at Aetrix Electronics and suitable for portable electronics, industrial controllers, and intelligent instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MXD1817XR29 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, communications, computing, and consumer applications.

The MXD181x family targets cost-sensitive, space-constrained microprocessor supervisory needs - delivering factory-trimmed reset thresholds, minimal external components, and ultra-low power in miniature SC70/SOT23 packages.

FAQ

What is the exact reset threshold voltage of MXD1817XR29 and how is it specified over temperature?

The MXD1817XR29 has a factory-set reset threshold of 2.88V, with ±2.5% accuracy guaranteed over the full operating temperature range of -40°C to +105°C. This value is confirmed in the Electrical Characteristics table under "MXD181_ _ R29" row, where min/typ/max are 2.80V/2.88V/2.97V. The device uses internal trimming to achieve this tolerance without external components.

Does MXD1817XR29 support manual reset functionality via the RESET pin?

No, MXD1817XR29 does not support manual reset detection. Only MXD1813 and MXD1818 variants include debounced manual-reset circuitry that triggers on a >1.5µs low pulse to the RESET pin. MXD1817XR29's RESET pin is output-only and functions solely as an active-high push-pull reset signal driven by the internal voltage monitor.

What package type and dimensions does MXD1817XR29 use, and is it RoHS-compliant?

MXD1817XR29 uses the SC70-3 package (outline X3-2), measuring 2.0mm × 1.25mm × 0.95mm with 0.65mm lead pitch. Per Maxim's packaging documentation, the "-T" suffix indicates lead-free (RoHS-compliant) construction. Land pattern number 90-0208 applies, and MSL rating is Level 1 - unlimited floor life at ≤30°C/60% RH.

Can MXD1817XR29 operate reliably when VCC drops below 2.0V?

Yes, MXD1817XR29 guarantees valid RESET/RESET logic states down to VCC = +1.0V, as stated in both the General Description and Absolute Maximum Ratings sections. Its internal comparator and output stage remain functional and produce defined high/low outputs even at 1V supply - critical for brownout recovery in battery-powered systems.

How does the reset timeout behavior of MXD1817XR29 respond to VCC rising edge slew rate?

The MXD1817XR29's 100ms reset timeout is internally timed and independent of VCC slew rate. Electrical Characteristics specify tRP = 100ms (min) for VCC rising, with no dependency on rise time - confirmed by Typical Operating Characteristics graph "RESET TIMEOUT PERIOD vs. TEMPERATURE", which shows consistent 100–250ms across -40°C to +110°C regardless of VCC ramp speed.