Analog Devices Inc./Maxim Integrated MXD1813XR46

Overview

MXD1813XR46 from Maxim Integrated is a low-power, open-drain, active-low microprocessor reset supervisor IC for +5V systems, featuring a 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 datasheet, MXD1813XR46 pinout, MXD1813XR46 application, or MXD1813XR46 equivalent, this page delivers verified electrical parameters, SC70-3 package mapping, manual-reset timing behavior, internal 5.5kΩ pullup resistor value, and precise reset threshold accuracy (±2.5%) across –40°C to +105°C - all critical for reliable μP supervision in space-constrained designs.

Technical Context

The MXD1813XR46 integrates a precision voltage comparator with hysteresis, an internal 100ms reset timeout timer, and dedicated debouncing logic for the RESET pin. Its open-drain output includes a factory-trimmed 5.5kΩ internal pullup resistor, eliminating external components while enabling bidirectional reset interfacing with microcontrollers like the Motorola 68HC11.

It operates over VCC = 1.2V to 5.5V and guarantees valid RESET assertion down to VCC = +1V. The device ignores fast VCC transients (e.g., ≤1.5μs glitches at 4.62V threshold overdrive) and maintains ±2.5% reset threshold accuracy across full temperature range, making it suitable for industrial-grade 5V power-rail monitoring.

Key Specifications

Pinout & Package

MXD1813XR46 is housed in a 3-pin SC70 package (outline X3-2, land pattern 90-0208), optimized for high-density placement and reflow compatibility. 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 MAX809TR46LKA+T and TPS3808G33DBVR, MXD1813XR46 uniquely combines 4.62V precision threshold, open-drain output with integrated pullup, and hardware-debounced manual reset in a 3-pin SC70 - delivering lower system-level component count and guaranteed timing behavior for legacy +5V embedded designs.

Availability

MXD1813XR46 is available at Aetrix Electronics and suitable for industrial controller supervision, portable medical instrumentation, set-top box power management, and intelligent test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MXD1813XR46 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, computing, and communications applications.

The MXD1810–MXD1813/MXD1815–MXD1818 product line was designed specifically for cost-sensitive, space-constrained microprocessor reset supervision in 5V and 3.3V/2.5V systems - emphasizing zero-external-component operation, wide temperature range, and robust transient immunity.

FAQ

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

The MXD1813XR46 has a factory-set reset threshold of 4.62V, with guaranteed accuracy of ±2.5% over the full operating temperature range of –40°C to +105°C. This specification is confirmed in the Electrical Characteristics table under "Reset Threshold (VTH)" for suffix R46, and applies across all production units without user calibration. The MXD1813XR46 achieves this stability using BiCMOS process trimming and on-die reference design.

Does MXD1813XR46 support manual reset via an external pushbutton, and what are the timing requirements?

Yes, MXD1813XR46 supports debounced manual reset: pulling the RESET pin low for ≥1.5μs triggers a guaranteed 100ms minimum reset timeout period. This feature is exclusive to the MXD1813/MXD1818 variants and is implemented with on-chip logic that filters mechanical switch bounce. The MXD1813XR46 does not require external RC networks - the debounce is fully integrated and validated per Figure 6 in the datasheet.

What package type and footprint does MXD1813XR46 use, and is it compatible with automated assembly?

MXD1813XR46 uses the 3-pin SC70 package (outline X3-2, land pattern 90-0208), measuring 2.0mm × 1.25mm × 0.9mm. It is fully compatible with standard SMT reflow processes, including lead-free soldering at peak temperatures up to +300°C for 10 seconds. The SC70 footprint is documented in Maxim's package library and supported by major CAD tools for automated placement and inspection.

How does the open-drain output of MXD1813XR46 function, and what is the value of its internal pullup resistor?

The MXD1813XR46 features an open-drain, active-low RESET output with an internal pullup resistor of 5.5kΩ (typical, 3.1kΩ to 7.5kΩ min/max) connected to VCC. This allows direct wired-OR connection to other reset sources and eliminates the need for an external pullup. When RESET is asserted (low), the output sinks up to 10mA; when deasserted (high-impedance), the internal resistor pulls the node to VCC - a key enabler for bidirectional μP reset interfaces.

What is the minimum supply voltage at which MXD1813XR46 guarantees valid RESET output behavior?

MXD1813XR46 guarantees valid RESET/RESET output logic states down to VCC = +1.0V, as explicitly stated in the Absolute Maximum Ratings and Electrical Characteristics sections. This ensures deterministic reset assertion during deep brownout conditions where many competing supervisors cease operation. The MXD1813XR46 maintains comparator functionality and output drive capability even as VCC declines below typical logic thresholds.