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Analog Devices Inc./Maxim Integrated MXD1811UR44+T
- Part No.:
- MXD1811UR44+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MXD1811UR44+T.pdf
- Description:
- IC MPU RESET CIRC 4.37V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,596
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Product details
Overview
MXD1811UR44+T from Maxim Integrated is an open-drain, active-low microprocessor reset supervisor IC designed for +5V systems. It monitors VCC and asserts RESET when supply voltage falls below 4.37V (±2.5%), maintains reset for ≥100ms after VCC recovery, and includes an internal 5.5kΩ pullup resistor. It operates from -40°C to +105°C in SOT23-3 packaging and draws only 4μA typical supply current - ideal for industrial controllers and battery-backed instrumentation.
For engineers reviewing the MXD1811UR44+T datasheet, MXD1811UR44+T pinout, MXD1811UR44+T application, or MXD1811UR44+T equivalent, key selection criteria include its 4.37V reset threshold accuracy, open-drain output compatibility with bidirectional μP reset pins (e.g., Motorola 68HC11), guaranteed RESET validity down to VCC = +1V, and immunity to sub-5µs VCC transients.
Technical Context
The MXD1811UR44+T implements a precision bandgap-based voltage comparator with hysteresis to detect VCC drops below its factory-trimmed 4.37V threshold. Its internal timer ensures a minimum 100ms reset timeout after VCC rises above threshold, independent of VCC slew rate.
As an open-drain device, it interfaces directly with microcontrollers having bidirectional reset inputs without external pullups. Its internal 5.5kΩ pullup enables logic-high default state while allowing external devices to drive RESET low - supporting shared-reset bus architectures in embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.37V ±2.5% - precisely holds system reset until +5V rail stabilizes above this level during power-up/brownout. |
| Reset Timeout Period | 100ms (min) - guarantees sufficient time for CPU initialization and peripheral stabilization before release. |
| 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. |
| VCC Range | +1.0V to +5.5V - ensures valid RESET output even during deep brownout conditions down to 1V. |
| Output Type | Open-drain, active-low - allows wired-OR reset buses and direct interface with bidirectional μP reset pins. |
| Internal Pullup | 5.5kΩ to VCC - eliminates need for external pullup resistor in most applications. |
Pinout & Package
MXD1811UR44+T is housed in a 3-pin SOT23-3 package (JEDEC MO-178AA), footprint-compatible with industry-standard reset supervisors. The compact 2.92mm × 1.3mm outline supports high-density PCB layouts in space-constrained applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RESET) | Open-drain active-low output | Drives low during reset assertion; floats high via internal 5.5kΩ pullup - compatible with shared-reset busses and bidirectional μP reset pins. |
| 2 (VCC) | Power supply & threshold monitor input | Supplies internal circuitry and serves as reference for reset comparator - valid operation guaranteed down to +1.0V. |
| 3 (GND) | Ground reference | Provides return path for internal comparator and output stage - must be connected to system ground plane for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrates precision voltage reference, comparator, timer, and pullup - reduces BOM count and layout area vs. discrete solutions. |
| Power-supply transient immunity | Rejects VCC glitches <5µs duration - prevents spurious resets caused by switching noise or ESD-induced dips. |
| ±2.5% reset threshold accuracy over temperature | Maintains tight trip point across -40°C to +105°C - eliminates need for calibration in wide-temperature deployments. |
| Guaranteed RESET validity to VCC = +1V | Ensures deterministic reset behavior during deep undervoltage events - critical for fail-safe shutdown in industrial systems. |
| Pin-compatible with DS181x family | Enables drop-in replacement in existing designs using Maxim's legacy reset ICs - simplifies component obsolescence mitigation. |
Applications
| Industrial Controllers | Portable Instrumentation |
|---|---|
Use Scenario: PLC I/O modules operating in factory-floor environments with noisy 24VDC supplies stepped down to +5V. IC Role / Device Role / Timing Role: Monitors local +5V rail and asserts active-low RESET to ARM Cortex-M7 MCU during brownout or power interruption. Use Value: Prevents corrupted register writes and firmware lockup by enforcing 100ms minimum reset hold time after supply recovery. |
Use Scenario: Handheld multimeter powered by two AA cells, stepping up to regulated +5V for ADC and display controller. IC Role / Device Role / Timing Role: Supervises +5V rail generated by boost converter and triggers reset if battery sag causes VCC to dip below 4.37V. Use Value: Enables reliable startup and shutdown sequencing with only 4μA quiescent current - extending battery life beyond 5 years. |
| Set-Top Box Power Management | Critical μP Monitoring |
Use Scenario: Consumer STB with dual-rail power (5V for HDMI/USB, 3.3V for SoC) where 5V rail powers baseband processor. IC Role / Device Role / Timing Role: Dedicated +5V supervisor asserting open-drain RESET to baseband μP; shares reset line with other peripherals via wired-OR. Use Value: Internal 5.5kΩ pullup eliminates external resistor, reducing component count while maintaining bus compatibility. |
Use Scenario: Medical infusion pump requiring fail-safe restart after AC power interruption or battery swap. IC Role / Device Role / Timing Role: Primary reset supervisor for safety-critical ARM-based controller, asserting RESET until +5V rail remains stable >100ms. Use Value: ±2.5% threshold tolerance ensures consistent trip point across temperature - meeting IEC 60601-1 reliability 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 |
|---|---|---|---|
| MAX809TRD3+T | 4.63V reset threshold, 140ms min timeout, push-pull output | Requires external pullup for wired-OR configurations; less suitable for bidirectional μP reset pins | Select when higher reset threshold and push-pull drive are preferred over open-drain flexibility |
| TPS3808G33DBVR | 3.3V reset threshold, adjustable timeout (200ms–1.2s), enable input | Designed for 3.3V systems; lacks manual reset detect and internal pullup | Choose for 3.3V applications needing programmable delay or enable-controlled reset assertion |
Compared with MXD1811UR44+T, MAX809TRD3+T offers tighter threshold tolerance (±1.5%) but requires external components for bus sharing, while TPS3808G33DBVR provides configurability at the cost of incompatible voltage range and missing integrated pullup - making MXD1811UR44+T optimal for fixed-threshold +5V open-drain reset needs.
Availability
MXD1811UR44+T is available at Aetrix Electronics and suitable for industrial controllers, portable instrumentation, set-top box power management, and critical μP monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MXD1811UR44+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 integration.
MXD1811UR44+T belongs to the MXD181x family of ultra-low-power microprocessor reset supervisors, engineered specifically for robust power-monitoring in space-constrained, wide-temperature embedded systems.
FAQ
What is the exact reset threshold voltage of MXD1811UR44+T and how tightly is it specified?
The MXD1811UR44+T 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, where min/typ/max are listed as 4.25V/4.37V/4.49V. The threshold is trimmed during production and does not require external calibration.
Does MXD1811UR44+T support manual reset functionality via the RESET pin?
No - MXD1811UR44+T does not include manual reset detection. That feature is exclusive to MXD1813/MXD1818 variants (e.g., MXD1813UR44+T), which assert reset when the RESET pin is held low for >1.5µs. MXD1811UR44+T uses the RESET pin solely as an open-drain output; driving it low externally has no supervisory effect.
Can MXD1811UR44+T operate reliably when VCC drops below 2.0V?
Yes - MXD1811UR44+T is guaranteed to maintain valid RESET logic states down to VCC = +1.0V, as stated in the General Description and Electrical Characteristics. Its internal comparator and output stage remain functional across the full 1.0V–5.5V supply range, enabling deterministic reset behavior during deep brownout conditions.
What package type and RoHS status does MXD1811UR44+T use?
MXD1811UR44+T is supplied in a 3-pin SOT23-3 package (JEDEC MO-178AA, package code U3-1) with lead(Pb)-free construction. The "+T" suffix explicitly denotes RoHS-compliant, matte-tin-plated terminals - verified in the Ordering Information section and Package Information table.
Is an external pullup resistor required when using MXD1811UR44+T?
No - MXD1811UR44+T integrates a 5.5kΩ internal pullup resistor from RESET to VCC, eliminating the need for an external component in standard open-drain configurations. This is confirmed in the Pin Descriptions and Electrical Characteristics tables, where RP is specified as 3.5kΩ–7.5kΩ for MXD1811/MXD1816 variants.
MXD1811UR44+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MXD1811UR44+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1811UR44+T 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+T reliable?
The price and inventory of MXD1811UR44+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1811UR44+T is usually 5 days.
3.What payment methods are accepted for MXD1811UR44+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1811UR44+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1811UR44+T?
MXD1811UR44+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1811UR44+T 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+T?
For technical support, including MXD1811UR44+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1811UR44+T requirements.
6.How does Aetrix verify that MXD1811UR44+T is sourced from the original manufacturer or authorized distributors?
All MXD1811UR44+T 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+T meets industry standards.
7.What is the process for return or replacement of MXD1811UR44+T?
All MXD1811UR44+T units undergo pre-shipment inspection (PSI). If there is an issue with MXD1811UR44+T, 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+T part is unused and in its original packaging.
Return procedure for MXD1811UR44+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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