Analog Devices Inc./Maxim Integrated MXD1816XR23+T

Overview

MXD1816XR23+T from Maxim Integrated is a low-power microprocessor reset supervisor IC with open-drain active-low RESET output, factory-trimmed 2.31V reset threshold (±2.5% over temperature), 100ms minimum reset timeout, internal 5.5kΩ pullup resistor, and operation down to VCC = +1.2V. It monitors +2.5V/+3.0V/+3.3V power supplies in portable embedded systems requiring reliable brownout protection.

For engineers reviewing the MXD1816XR23+T datasheet, MXD1816XR23+T pinout, MXD1816XR23+T application, or MXD1816XR23+T equivalent, key selection criteria include its SC70-3 package, 4μA supply current at +3.6V, debounced manual-reset capability exclusion (vs. MXD1818), and compatibility with bidirectional μP reset pins without external pullup.

Technical Context

This device implements a precision bandgap-based voltage comparator with hysteresis to detect VCC drops below 2.31V, triggering an open-drain RESET assertion held for ≥100ms after VCC recovers. Its BiCMOS process enables 4μA quiescent current and guaranteed logic validity down to VCC = +1.2V.

The internal 5.5kΩ pullup ensures proper high-level RESET state when deasserted; sink current capability of 10mA at VOUT = 0.4V supports direct interface to standard CMOS inputs. It lacks manual-reset debounce circuitry-distinguishing it from MXD1813/MXD1818-and is not rated for push-button detection.

Key Specifications

Pinout & Package

MXD1816XR23+T is housed in a 3-pin SC70 package (outline X3-2), with 0.65mm pitch and exposed pad not connected. Pin 1 is RESET (open-drain active-low), 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 MXD1816XR23+T, MAX809TRD3+T offers higher reset voltage but demands external biasing, while TPS3808G125DBVR provides flexibility at the cost of higher component count and current consumption - MXD1816XR23+T delivers optimal balance of precision, integration, and ultra-low power in compact SC70 form.

Availability

MXD1816XR23+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart home hub controllers, and handheld test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MXD1816XR23+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) is a semiconductor company specializing in analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

MXD1816XR23+T belongs to the MXD181x family of micropower reset supervisors, engineered specifically for space- and energy-constrained embedded systems requiring high-accuracy voltage monitoring and robust brownout immunity.

FAQ

What is the exact reset threshold voltage of MXD1816XR23+T and how tightly is it specified?

The MXD1816XR23+T has a factory-set reset threshold of 2.31V, with guaranteed accuracy of ±2.5% over the full operating temperature range of -40°C to +105°C. This value is confirmed in the Electrical Characteristics table under "MXD181_ _ R23" row, where min/typ/max are 2.25V/2.31V/2.37V. The threshold is trimmed during production and does not require external calibration.

Does MXD1816XR23+T support manual reset functionality via the RESET pin?

No, MXD1816XR23+T does not include manual reset debounce circuitry. Unlike MXD1813/MXD1818, it lacks push-button detection logic - the RESET pin is strictly an open-drain output and must not be driven low externally. Driving it low may cause undefined behavior or damage, as stated in Absolute Maximum Ratings.

What is the internal pullup resistor value on the RESET pin of MXD1816XR23+T?

The internal pullup resistor on the RESET pin of MXD1816XR23+T is 5.5kΩ (typical), with a range of 3.5kΩ to 7.5kΩ across process and temperature. This value is explicitly listed in the Electrical Characteristics table under "Internal Pullup Resistor, Open-Drain" for "MXD1811/MXD1816", confirming direct applicability to MXD1816XR23+T.

Can MXD1816XR23+T operate reliably at VCC = +1.2V, and what happens to RESET output at that voltage?

Yes, MXD1816XR23+T is guaranteed to maintain valid RESET logic states down to VCC = +1.2V (minimum specified operating voltage). At this level, the open-drain output retains sufficient sink strength to drive low when asserted, and the internal pullup ensures a defined high state when deasserted - critical for fail-safe operation during deep brownout.

Is MXD1816XR23+T pin-compatible with other devices in the MXD181x family, and which packages share the same footprint?

Yes, MXD1816XR23+T uses the SC70-3 package (outline X3-2), which is pin-compatible with all MXD181x XR-series variants (e.g., MXD1815XR31+T, MXD1817XR23+T). It shares identical pin 1–3 assignments (RESET/VCC/GND) and land pattern (90-0208), enabling drop-in replacement within the same threshold and output-type group without PCB redesign.