Analog Devices Inc./Maxim Integrated MXD1813XR46+T

Overview

MXD1813XR46+T from Maxim Integrated is a low-power, open-drain, active-low microprocessor reset IC for +5V systems, featuring factory-set 4.62V reset threshold, 100ms minimum reset timeout, and debounced manual-reset detection (1.5μs trigger). It monitors VCC supply integrity and asserts RESET during power-up, brownout, or push-button events in embedded controllers and portable equipment.

For engineers reviewing the MXD1813XR46+T datasheet, MXD1813XR46+T pinout, MXD1813XR46+T application, or MXD1813XR46+T equivalent, key selection criteria include its 4.62V threshold accuracy (±2.5%), internal 5.5kΩ pullup resistor, guaranteed RESET validity down to VCC = +1V, and SC70-3 package compatibility with space-constrained designs.

Technical Context

The MXD1813XR46+T implements a precision bandgap-based voltage comparator with hysteresis to detect VCC drops below 4.62V (min 4.50V, max 4.75V), coupled with a monostable timer that holds RESET asserted for ≥100ms after VCC recovery. Its internal debouncing logic filters mechanical switch bounce by requiring a sustained low on RESET ≥1.5μs before initiating the 100ms manual-reset timeout period.

This device operates across -40°C to +105°C, draws only 4μA typical supply current at +3.6V, and maintains functional RESET/RESET output down to VCC = +1V. The open-drain output includes an internal 5.5kΩ pullup resistor and supports sink currents up to 10mA at VOUT = 0.4V when asserted.

Key Specifications

Pinout & Package

MXD1813XR46+T is housed in a 3-pin SC70 package (outline X3-2, land pattern 90-0208), measuring 2.0mm × 1.25mm × 0.9mm, rated for -40°C to +105°C operation. Its pinout is optimized for minimal board area and direct integration into +5V microprocessor supervisory paths.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MXD1813XR46+T, MAX809TRD3+T offers identical threshold but lacks manual-reset debouncing and requires external biasing for bidirectional μP pins, while TPS3808G33DBVR targets different voltage domains and adds complexity with adjustable delay-neither provides the integrated 4.62V + manual-reset + SC70 solution of MXD1813XR46+T.

Availability

MXD1813XR46+T is available at Aetrix Electronics and suitable for computers and controllers, intelligent instruments, and portable/battery-powered equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MXD1813XR46+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 high-performance analog and mixed-signal semiconductor solutions for industrial, communications, and consumer applications.

The MXD1810–MXD1813/MXD1815–MXD1818 product line delivers ultra-low-power, factory-trimmed reset supervisors targeting space-constrained +5V and +3.3V embedded systems requiring high reliability and minimal external components.

FAQ

What is the exact reset threshold voltage of MXD1813XR46+T and how tightly is it specified?

The MXD1813XR46+T has a factory-set nominal reset threshold of 4.62V, with guaranteed limits of 4.50V (minimum) and 4.75V (maximum) over the full -40°C to +105°C temperature range. This ±2.5% accuracy eliminates need for field calibration and ensures robust brownout protection in +5V systems where supply tolerance is typically ±5%.

Does MXD1813XR46+T support manual reset, and how does its debouncing work?

Yes, MXD1813XR46+T features integrated manual-reset debouncing: a logic-low pulse on the RESET pin lasting ≥1.5μs triggers a guaranteed 100ms reset timeout. This internal circuit rejects mechanical switch bounce without external RC networks, and release of the switch initiates the full timeout period-ensuring clean, deterministic reset behavior in handheld and industrial UIs.

What package type and footprint does MXD1813XR46+T use, and is it RoHS-compliant?

MXD1813XR46+T is supplied in a 3-pin SC70 package (outline X3-2, land pattern 90-0208), measuring 2.0mm × 1.25mm. The "+T" suffix confirms lead(Pb)-free, RoHS-compliant construction. Its small footprint supports high-density PCB layouts in portable and IoT edge devices where board space is constrained.

Can MXD1813XR46+T operate reliably at very low supply voltages?

Yes, MXD1813XR46+T guarantees correct RESET/RESET logic state down to VCC = +1.0V, and functions across a full supply range of +1.0V to +5.5V. This enables fail-safe behavior during deep brownout recovery and supports applications where system-level undervoltage detection must persist well below normal operating rails.

How does the open-drain output of MXD1813XR46+T interface with microprocessors having bidirectional reset pins?

The MXD1813XR46+T open-drain RESET output includes an internal 5.5kΩ pullup resistor to VCC, allowing direct connection to bidirectional μP reset pins (e.g., Motorola 68HC11, some ARM variants) without external components. Either the μP or MXD1813XR46+T can assert reset, enabling flexible system-level control while maintaining noise immunity and voltage-level compatibility.