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Analog Devices Inc./Maxim Integrated MXD1811XR44
- Part No.:
- MXD1811XR44
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MXD1811XR44.pdf
- Description:
- IC SUPERVISOR MICROPROCES RESET
- Quantity:
- Payment:
- Shipping:
Inventory:2,077
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Product details
Overview
MXD1811XR44 from Maxim Integrated is an open-drain, active-low microprocessor reset supervisor IC designed for +5V systems. It monitors VCC and asserts RESET when voltage falls below 4.37V (±2.5%), holds reset for ≥100ms after recovery, and features an internal 5.5kΩ pullup resistor. Used in portable equipment and critical μP monitoring to prevent code-execution errors during brownout.
For engineers reviewing the MXD1811XR44 datasheet, MXD1811XR44 pinout, MXD1811XR44 application, or MXD1811XR44 equivalent, this page delivers verified electrical specs, SC70-3 package mapping, manual-reset capability exclusion, reset timeout behavior, and direct alternatives for 4.37V threshold supervision in space-constrained industrial and embedded designs.
Technical Context
The MXD1811XR44 implements a precision bandgap-based voltage comparator with hysteresis to detect VCC drops below its factory-trimmed 4.37V threshold. Its internal timer guarantees ≥100ms reset assertion after VCC rises above threshold, independent of supply ramp rate.
This device lacks manual-reset detection circuitry (exclusive to MXD1813/MXD1818), has no push-button debounce logic, and uses open-drain output architecture-enabling bidirectional reset interfacing with μPs like Motorola 68HC11 without external pullups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.37V ±2.5% - ensures reliable reset initiation at nominal +5V rail dropout |
| Reset Timeout Period | ≥100ms - guarantees sufficient processor initialization time after power recovery |
| Supply Current | 4µA typical at +3.6V - enables multi-year battery life in portable applications |
| Operating Voltage Range | +1.2V to +5.5V - supports valid reset assertion down to near-undervoltage conditions |
| Output Type | Open-drain, active-low - allows wired-OR configuration and interface with bidirectional μP reset pins |
| Internal Pullup Resistor | 5.5kΩ - eliminates need for external pullup while maintaining defined high state when not asserted |
| Temperature Range | -40°C to +105°C - qualified for industrial and automotive under-hood environments |
Pinout & Package
MXD1811XR44 is housed in a 3-pin SC70 package (outline X3-2, land pattern 90-0208), measuring 2.0mm × 1.25mm × 0.9mm, suitable for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Supply input and reset-threshold monitor node - must be connected directly to monitored +5V rail |
| 2 | RESET | Open-drain, active-low output - sinks current when asserted; pulled high via internal 5.5kΩ resistor when inactive |
| 3 | GND | Ground reference for comparator and output stage - requires low-impedance connection to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.37V threshold | Factory-trimmed ±2.5% over -40°C to +105°C - eliminates calibration overhead in production |
| No external components required | Self-contained reset generation - reduces BOM count and layout area vs. discrete RC+comparator solutions |
| Low 4µA quiescent current | Enables use in always-on battery-backed subsystems without measurable drain impact |
| SC70-3 footprint compatibility | Matches industry-standard 3-pin ultra-small outline - supports automated placement and reflow |
| VCC-valid-to-1V operation | Guaranteed RESET logic state integrity down to +1.2V supply - prevents metastability during deep brownout |
Applications
| Computers and Controllers | Intelligent Instruments |
|---|---|
Use Scenario: Monitoring +5V power rails in industrial PLC controllers during line-voltage sags. IC Role / Device Role / Timing Role: Supervisory reset generator asserting active-low signal to ARM Cortex-M4 reset pin upon VCC drop below 4.37V. Use Value: Prevents firmware corruption by ensuring deterministic restart after 100ms minimum hold time, even during rapid 50Hz AC dips. |
Use Scenario: Power supervision in handheld multimeters with lithium coin-cell backup. IC Role / Device Role / Timing Role: Open-drain RESET output interfaces directly with bidirectional reset pin of MSP430F5xx MCU. Use Value: Internal 5.5kΩ pullup eliminates external component, reducing bill-of-materials and enabling sub-10mm² PCB area allocation. |
| Set-Top Boxes | Printers |
Use Scenario: Ensuring clean boot sequence in cable STBs powered from switched-mode +5V supply. IC Role / Device Role / Timing Role: Voltage monitor detecting undershoot on main 5V rail caused by load transients from tuner or demodulator ICs. Use Value: Immunity to <10µs negative transients (per Typical Operating Characteristics) avoids spurious resets during normal operation. |
Use Scenario: Reset coordination between main SoC and peripheral ASICs in inkjet printer engine control board. IC Role / Device Role / Timing Role: Single-point reset supervisor driving multiple downstream reset inputs via wired-OR topology. Use Value: Open-drain output enables safe parallel connection without contention, simplifying multi-rail reset sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TR44D3T | Same 4.37V threshold, SOT23-3 package, push-pull output (not open-drain) | Requires external pullup for bidirectional reset interfaces; incompatible with wired-OR topologies | Select only if push-pull drive strength (350µA source) is required and open-drain flexibility is unnecessary |
| TPS3808G33DBVR | 3.3V threshold (not 4.37V); adjustable delay option; higher 12µA ICC; SOT23-5 package | Not pin-compatible; requires PCB redesign; unsuitable for fixed +5V rail supervision without external divider | Choose only for new designs needing programmable timeout or lower-voltage monitoring - not a drop-in replacement |
Compared with MAX809TR44D3T and TPS3808G33DBVR, MXD1811XR44 uniquely provides factory-set 4.37V detection in SC70-3 with open-drain output and 4µA ICC - making it optimal for space-constrained +5V systems requiring bidirectional reset compatibility and minimal power draw.
Availability
MXD1811XR44 is available at Aetrix Electronics and suitable for computers and controllers, intelligent instruments, and set-top boxes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MXD1811XR44 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.
The MXD1810–MXD1818 family was designed specifically for low-power, high-accuracy microprocessor reset supervision in compact, battery-sensitive, and thermally demanding embedded systems.
FAQ
What is the exact reset threshold voltage of MXD1811XR44 and how tightly is it specified?
The MXD1811XR44 has a factory-set reset threshold of 4.37V, 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 "Reset Threshold" for suffix R44, and reflects nominal trimming at room temperature with process compensation across voltage and temperature.
Does MXD1811XR44 support manual reset functionality via an external pushbutton?
No, MXD1811XR44 does not include manual reset detection circuitry. That feature is exclusive to the MXD1813 and MXD1818 variants, which require a RESET pin low pulse >1.5µs to trigger debounced reset. MXD1811XR44 responds only to VCC-supply monitoring and has no internal pushbutton logic.
What package type and dimensions does MXD1811XR44 use, and is it RoHS-compliant?
MXD1811XR44 uses the 3-pin SC70 package (outline X3-2), measuring 2.0mm × 1.25mm × 0.9mm. It is available in lead(Pb)-free packaging - indicated by the "+T" suffix per ordering conventions - and complies with RoHS Directive 2011/65/EU.
Can MXD1811XR44 interface directly with a microcontroller that has a bidirectional reset pin?
Yes, MXD1811XR44's open-drain, active-low RESET output is explicitly designed for bidirectional reset interfaces - such as those found on Motorola 68HC11 or certain MSP430 devices. Its internal 5.5kΩ pullup resistor eliminates the need for an external pullup, enabling direct connection without additional components.
What is the minimum supply voltage at which MXD1811XR44 guarantees valid RESET output logic states?
MXD1811XR44 guarantees correct RESET/RESET logic state down to VCC = +1.2V (minimum specified operating voltage). This ensures deterministic reset behavior during deep brownout conditions where many competing supervisors fail to maintain defined output levels.
MXD1811XR44 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.37V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MXD1811XR44 FAQ
1.How can I place an order for MXD1811XR44 through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1811XR44 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MXD1811XR44 reliable?
The price and inventory of MXD1811XR44 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1811XR44 is usually 5 days.
3.What payment methods are accepted for MXD1811XR44?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1811XR44 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1811XR44?
MXD1811XR44 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1811XR44 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MXD1811XR44?
For technical support, including MXD1811XR44 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1811XR44 requirements.
6.How does Aetrix verify that MXD1811XR44 is sourced from the original manufacturer or authorized distributors?
All MXD1811XR44 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MXD1811XR44 meets industry standards.
7.What is the process for return or replacement of MXD1811XR44?
All MXD1811XR44 units undergo pre-shipment inspection (PSI). If there is an issue with MXD1811XR44, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MXD1811XR44 part is unused and in its original packaging.
Return procedure for MXD1811XR44:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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