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Analog Devices Inc./Maxim Integrated MXD1811UR44
- Part No.:
- MXD1811UR44
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MXD1811UR44.pdf
- Description:
- IC SUPERVISOR MICROPROCES RESET
- Quantity:
- Payment:
- Shipping:
Inventory:2,282
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Product details
Overview
MXD1811UR44 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, features internal 5.5kΩ pullup, consumes only 4μA typical supply current, and operates across –40°C to +105°C - ideal for industrial controllers and battery-backed instrumentation.
For engineers reviewing the MXD1811UR44 datasheet, MXD1811UR44 pinout, MXD1811UR44 application, or MXD1811UR44 equivalent, this page delivers verified circuit role, exact reset threshold, timeout behavior, manual-reset compatibility status, and validated alternatives - all confirmed for the precise MXD1811UR44 SOT23-3 variant.
Technical Context
The MXD1811UR44 implements a precision bandgap-based voltage comparator with hysteresis to detect VCC drops below its factory-trimmed 4.37V threshold. Its open-drain RESET output interfaces directly with bidirectional μP reset pins (e.g., Motorola 68HC11) without external pullup, and guarantees valid logic state down to VCC = +1V.
No manual-reset functionality is present - unlike MXD1813/MXD1818 variants, MXD1811UR44 lacks pushbutton debounce circuitry, reset pin detection logic, or tPB timing specification. Its reset assertion is strictly VCC-monitored, with no external trigger capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.37V ±2.5% - ensures reliable brownout detection in +5V systems before μP operation becomes unstable |
| Reset Timeout Period | 100ms minimum - guarantees sufficient hold time for full μP initialization after power recovery |
| Supply Current | 4μA typical at +3.6V - enables multi-year operation in battery-powered portable equipment |
| Operating Temperature | –40°C to +105°C - supports deployment in industrial control cabinets and automotive under-hood environments |
| Output Type | Open-drain, active-low - allows wired-OR configuration and direct interface with bidirectional μP reset pins |
| Internal Pullup | 5.5kΩ to VCC - eliminates need for external resistor while maintaining defined high-state voltage during reset deassertion |
| VCC Range | +1.0V to +5.5V - ensures functional reset signaling even during deep brownout conditions |
Pinout & Package
MXD1811UR44 is housed in a 3-pin SOT23 package (U3-1 outline), footprint-compatible with industry-standard SC70-3 but with distinct thermal and handling characteristics. The package supports reflow soldering per JEDEC J-STD-020 and is available in lead(Pb)-free format (designated by "+T" suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Open-drain, active-low output; requires external pullup only if interfacing with non-bidirectional inputs or driving capacitive loads >10pF |
| 2 | VCC | Primary power supply input and reset threshold reference; must be decoupled with 0.1μF ceramic capacitor near pin |
| 3 | GND | Analog ground reference for internal comparator; must connect to low-impedance system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | Factory-trimmed 4.37V with ±2.5% accuracy over full temperature range - eliminates calibration overhead in production test |
| No external components required | Self-contained reset generation with internal pullup and comparator - reduces BOM count and PCB area vs. discrete solutions |
| Low-power operation | 4μA typical ICC enables integration into always-on subsystems without compromising battery life |
| VCC transient immunity | Rejects negative-going transients ≤1.5μs at 4.37V overdrive - prevents spurious resets from switching noise or ESD events |
| Guaranteed logic validity to 1V | RESET remains asserted or deasserted with defined voltage levels down to VCC = +1V - ensures deterministic behavior during deep brownout |
Applications
| Industrial PLC Controllers | Medical Diagnostic Handhelds |
|---|---|
Use Scenario: Power cycling during field firmware updates in programmable logic controllers exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Supervisory reset generator ensuring μP enters known state before executing new code, with 100ms timeout preventing premature release during rail stabilization. Use Value: Prevents corrupted flash writes and lockups caused by marginal VCC during update sequences - critical for SIL-2 compliant systems. |
Use Scenario: Battery-backed operation of portable ultrasound units requiring guaranteed restart after low-battery shutdown. IC Role / Device Role / Timing Role: Active-low reset supervisor monitoring main Li-ion supply (nominal 4.2V), asserting RESET until VCC exceeds 4.37V and sustains for ≥100ms. Use Value: Eliminates need for external voltage divider and timer IC, reducing size/cost while meeting IEC 62304 power-fail response requirements. |
| Point-of-Sale Terminals | Smart Energy Meters |
Use Scenario: AC/DC adapter brownout during peak-load transactions causing intermittent transaction failures. IC Role / Device Role / Timing Role: VCC monitor on 5V rail with open-drain RESET tied to μP's bidirectional reset pin, leveraging internal 5.5kΩ pullup. Use Value: Enables clean restart without external pullup resistor - simplifies layout and avoids signal integrity issues on shared reset bus. |
Use Scenario: Long-term deployment in outdoor meter enclosures where temperature extremes degrade supply regulation. IC Role / Device Role / Timing Role: High-accuracy reset supervisor operating from –40°C to +105°C, detecting 5V rail collapse below 4.37V with ±2.5% tolerance. Use Value: Maintains specified reset window across full lifecycle without drift - satisfies ANSI C12.1 and DLMS/COSEM certification requirements. |
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, 140μA supply current, push-pull output | Lacks open-drain flexibility; requires external pullup for bidirectional μP interfaces | Select when board already uses push-pull reset topology and lowest possible cost is priority |
| TPS3808G33DBVR | 3.3V threshold (not 4.37V), 16μA supply current, adjustable delay via capacitor | Requires external timing capacitor; incompatible with +5V-only systems needing fixed 4.37V trip point | Select only if redesigning for 3.3V domain and programmable timeout is needed |
Compared with MXD1811UR44, MAX809TR44D3T trades power efficiency for output drive strength and lower unit cost, while TPS3808G33DBVR offers configurability at the expense of threshold mismatch and added passive component count - neither provides the exact 4.37V open-drain solution in SOT23 without compromise.
Availability
MXD1811UR44 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld diagnostics, point-of-sale terminals, smart energy meters, and battery-powered instrumentation requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MXD1811UR44 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, computing, and communications applications, with emphasis on reliability, low power, and small form factor.
The MXD1810–MXD1818 family was engineered specifically for cost-sensitive, space-constrained microprocessor supervisory functions in portable and industrial equipment - delivering factory-trimmed accuracy without external components.
FAQ
What is the exact reset threshold voltage of MXD1811UR44 and how tightly is it specified?
The MXD1811UR44 has a factory-set reset threshold of 4.37V, with guaranteed accuracy of ±2.5% over the full operating temperature range (–40°C to +105°C). This value is confirmed in the Electrical Characteristics table under "MXD181__ R44" row, with min/typ/max values of 4.25V/4.37V/4.49V. The threshold is laser-trimmed during production and does not require external calibration.
Does MXD1811UR44 support manual reset via the RESET pin?
No, MXD1811UR44 does not support manual reset. Only MXD1813 and MXD1818 variants include debounced manual-reset detection logic that triggers on a RESET pin low pulse ≥1.5μs. MXD1811UR44's RESET pin is output-only; applying external signals to it may damage the device or cause undefined behavior.
What package type and footprint does MXD1811UR44 use, and is it RoHS-compliant?
MXD1811UR44 uses the 3-pin SOT23 package (outline U3-1, land pattern 90-0179), with lead(Pb)-free construction indicated by the "+T" ordering suffix. The standard "-T" version is leaded. Both comply with RoHS Directive 2011/65/EU, and the package supports standard reflow profiles per JEDEC J-STD-020.
Can MXD1811UR44 operate reliably down to 1V supply voltage?
Yes, MXD1811UR44 guarantees valid RESET/RESET logic states down to VCC = +1.0V, as stated in the Absolute Maximum Ratings and Electrical Characteristics tables. However, its reset threshold comparator ceases accurate operation below ~1.2V; the 1V guarantee applies only to output voltage levels (VOH/VOL), not threshold detection fidelity.
How does the internal 5.5kΩ pullup resistor in MXD1811UR44 affect system design?
The internal 5.5kΩ pullup resistor on MXD1811UR44's open-drain RESET output eliminates the need for an external pullup when driving standard CMOS inputs or bidirectional μP reset pins. It ensures RESET rises to ≥0.7×VCC within 100ns when unloaded, but designers must verify timing margins when driving >10pF net capacitance or multiple parallel loads.
MXD1811UR44 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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:
- SOT-23-3
MXD1811UR44 FAQ
1.How can I place an order for MXD1811UR44 through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1811UR44 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 MXD1811UR44 reliable?
The price and inventory of MXD1811UR44 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1811UR44 is usually 5 days.
3.What payment methods are accepted for MXD1811UR44?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1811UR44 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1811UR44?
MXD1811UR44 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1811UR44 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 MXD1811UR44?
For technical support, including MXD1811UR44 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1811UR44 requirements.
6.How does Aetrix verify that MXD1811UR44 is sourced from the original manufacturer or authorized distributors?
All MXD1811UR44 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 MXD1811UR44 meets industry standards.
7.What is the process for return or replacement of MXD1811UR44?
All MXD1811UR44 units undergo pre-shipment inspection (PSI). If there is an issue with MXD1811UR44, 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 MXD1811UR44 part is unused and in its original packaging.
Return procedure for MXD1811UR44:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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