Analog Devices Inc./Maxim Integrated MXD1817XR22+T

Overview

MXD1817XR22+T from Maxim Integrated is a precision microprocessor reset supervisor IC with active-high push-pull RESET output, 2.18V factory-trimmed reset threshold, and 100ms minimum reset timeout period. It monitors +2.5V/+3.0V/+3.3V power rails in embedded systems, asserts reset during brownout or power-up, and guarantees valid logic output down to VCC = +1V. Designed for portable equipment requiring low-power supervision.

For engineers reviewing the MXD1817XR22+T datasheet, MXD1817XR22+T pinout, MXD1817XR22+T application, or MXD1817XR22+T equivalent, key selection criteria include reset threshold accuracy (±2.5%), manual-reset debounce capability (absent in this variant), open-drain vs. push-pull output configuration, and SC70-3 package compatibility with space-constrained PCB layouts.

Technical Context

The MXD1817XR22+T implements a precision bandgap-based voltage comparator monitoring VCC against a fixed 2.18V threshold, with ±2.5% accuracy over –40°C to +105°C. Its internal timer ensures reset remains asserted for ≥100ms after VCC rises above threshold, independent of supply ramp rate.

This device belongs to the MXD1815–MXD1818 subfamily for 2.5V/3.0V/3.3V systems and features an active-high push-pull RESET output - unlike MXD1818 variants with manual-reset detect or MXD1816 open-drain versions. It lacks debounced manual-reset input functionality.

Key Specifications

Pinout & Package

MXD1817XR22+T is housed in a 3-pin SC70 package (outline X3-2, land pattern 90-0208), with 0.65mm pitch and exposed pad not connected internally. The package supports reflow soldering per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MXD1817XR22+T, MAX6326XR22+T trades push-pull simplicity for watchdog capability and open-drain flexibility, while TPS3808G12QDBVRQ1 adds automotive qualification and enable control at the cost of larger size and higher BOM complexity.

Availability

MXD1817XR22+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, smart energy meters, and point-of-sale terminals requiring stable component supply and long-term lifecycle support.

Supply support for MXD1817XR22+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 industrial, communications, and computing applications, emphasizing reliability, low power, and small form factor.

The MXD1815–MXD1818 product line delivers ultra-low-power microprocessor reset supervisors optimized for battery-operated and space-constrained embedded systems using 2.5V/3.0V/3.3V rails.

FAQ

What is the reset threshold voltage of the MXD1817XR22+T?

The MXD1817XR22+T has a factory-set reset threshold of 2.18V, with ±2.5% accuracy guaranteed over the full operating temperature range of –40°C to +105°C. This value is trimmed during production and applies specifically to the R22 suffix variant within the MXD1815–MXD1818 family.

Does the MXD1817XR22+T support manual reset functionality?

No, the MXD1817XR22+T does not include manual reset detection. That feature is exclusive to MXD1813 and MXD1818 variants. MXD1817XR22+T provides only power-supply monitoring and automatic reset assertion based on VCC voltage crossing the 2.18V threshold.

What is the output configuration of the MXD1817XR22+T RESET pin?

The MXD1817XR22+T features an active-high push-pull RESET output. When reset is asserted, the pin drives high; when inactive, it drives low. This eliminates the need for an external pullup resistor and simplifies interface with microcontrollers expecting active-high reset signals.

Can the MXD1817XR22+T operate reliably at VCC = +1.2V?

Yes, the MXD1817XR22+T is fully specified to operate down to VCC = +1.2V and guarantees valid RESET logic states down to +1.0V. Its internal comparator and timer remain functional across this extended low-voltage range, supporting graceful shutdown in battery-depleted conditions.

Is the MXD1817XR22+T compatible with SOT23-3 footprints?

No, the MXD1817XR22+T uses a 3-pin SC70 package (X3-2 outline), which has a smaller body size (2.0mm × 2.1mm) and tighter 0.65mm pin pitch than SOT23-3 (2.9mm × 1.6mm, 0.95mm pitch). It is not mechanically or solder-reflow compatible with SOT23 footprints without PCB redesign.