Analog Devices Inc./Maxim Integrated MXD1817UR23

Overview

MXD1817UR23 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, 2.31V factory-set reset threshold (±2.5% over temperature), 100ms minimum reset timeout, and guaranteed operation down to VCC = +1V. It is used in portable battery-powered equipment to ensure reliable μP initialization during power-up, brownout, and manual reset events.

For engineers reviewing the MXD1817UR23 datasheet, MXD1817UR23 pinout, MXD1817UR23 application, or MXD1817UR23 equivalent, key selection considerations include its active-high push-pull output configuration, precise 2.31V threshold for 2.5V/3.3V rails, debouncing-free manual-reset absence (distinguishing it from MXD1813/MXD1818), and SC70/SOT23 package compatibility with space-constrained embedded designs.

Technical Context

The MXD1817UR23 implements a precision bandgap-based voltage comparator monitoring VCC against a factory-trimmed 2.31V threshold, with internal hysteresis and transient immunity up to 5µs at 200mV overdrive. Its reset generator enforces a fixed 100ms timeout after VCC rises above threshold, independent of temperature or supply variation.

Unlike MXD1813/MXD1818, it lacks manual-reset input detection circuitry and debouncing logic; its RESET pin serves only as an output. The push-pull driver delivers 350µA source current when asserted and supports valid logic levels down to VCC = +1V, enabling robust interfacing with modern low-voltage microcontrollers.

Key Specifications

Pinout & Package

MXD1817UR23 is housed in a 3-pin SOT23 package (outline U3-1), with 1.3mm × 2.9mm footprint, 0.95mm height, and gull-wing leads. Pin 1 is RESET (active-high push-pull output), 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 MAX809TRD23+T and TPS3808G125DBVR, MXD1817UR23 offers the only combination of factory-set 2.31V threshold, active-high push-pull output in SOT23-3, and guaranteed +1V operation - delivering optimal balance of simplicity, reliability, and low-voltage robustness for compact 2.5V/3.3V systems.

Availability

MXD1817UR23 is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, and smart energy meters requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for MXD1817UR23 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.

The MXD1810–MXD1818 family was designed specifically for cost-sensitive, space-constrained microprocessor supervisory functions in battery-powered and industrial embedded systems - emphasizing precision threshold accuracy, ultra-low power, and minimal external components.

FAQ

What is the reset output polarity and drive type of MXD1817UR23?

MXD1817UR23 features an active-high push-pull RESET output. When reset is asserted (i.e., VCC drops below 2.31V), the RESET pin drives high; when deasserted, it actively pulls low. This eliminates the need for an external pullup resistor and ensures fast, clean transitions compatible with μPs requiring high-active reset signals. The output delivers 350µA source current when asserted and sinks current when deasserted, as confirmed in the Electrical Characteristics table.

Does MXD1817UR23 support manual reset via the RESET pin?

No, MXD1817UR23 does not support manual reset detection. Unlike MXD1813/MXD1818, it lacks internal debouncing circuitry and push-button detect logic on the RESET pin. The RESET pin is output-only; applying an external signal to it may damage the device or cause undefined behavior. Manual reset functionality must be implemented externally using a separate switch and logic, or by selecting MXD1813UR23/MXD1818UR23 instead.

What is the minimum VCC voltage at which MXD1817UR23 guarantees valid RESET output?

MXD1817UR23 guarantees valid RESET logic levels down to VCC = +1.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. This ensures deterministic reset behavior during deep brownout conditions - critical for fail-safe operation in battery-powered systems where supply voltage decays gradually. Operation below +1.0V is not characterized and may result in indeterminate output states.

Is MXD1817UR23 pin-compatible with other devices in the MXD181x family?

Yes, MXD1817UR23 shares identical SOT23-3 pinout (RESET–VCC–GND) with all members of the MXD1810–MXD1818 family, including MXD1810UR23, MXD1812UR23, and MXD1815UR23. However, functional compatibility depends on output type (push-pull vs. open-drain) and reset polarity (high vs. low). MXD1817UR23 is functionally interchangeable only with other active-high push-pull variants like MXD1812UR23 - not with active-low or open-drain parts.

What package options are available for MXD1817UR23?

MXD1817UR23 is offered exclusively in the 3-pin SOT23 package (order code suffix "U"), per the Ordering Information table. A SC70-3 variant exists in the family (MXD1817XR23), but MXD1817UR23 itself is SOT23-only. Both packages share identical pin configuration and electrical specifications, differing only in physical dimensions and thermal characteristics - SOT23 offers higher power dissipation (320mW at +70°C) compared to SC70 (174mW).