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Analog Devices Inc./Maxim Integrated MXD1812XR44+
- Part No.:
- MXD1812XR44+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MXD1812XR44+.pdf
- Description:
- IC SUPERVISOR
- Quantity:
- Payment:
- Shipping:
Inventory:1,120
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Product details
Overview
MXD1812XR44+ from Maxim Integrated is a low-power microprocessor reset IC with active-high push-pull RESET output, factory-set 4.37V reset threshold (±2.5% over temperature), 100ms minimum reset timeout, and guaranteed operation down to VCC = +1V. It monitors +5V systems in portable/battery-powered equipment, computers, and intelligent instruments to prevent code-execution errors during power-up, brownout, or power-down.
For engineers reviewing the MXD1812XR44+ datasheet, MXD1812XR44+ pinout, MXD1812XR44+ application, or MXD1812XR44+ equivalent, key selection criteria include its active-high push-pull output configuration, 4.37V threshold accuracy, 4μA supply current at +3.6V, SC70-3 package compatibility, and absence of manual-reset debounce (unlike MXD1813/MXD1818).
Technical Context
The MXD1812XR44+ implements a precision voltage comparator with hysteresis-free threshold detection and an internal monostable timer that asserts RESET for ≥100ms after VCC rises above 4.37V. Its push-pull output drives high actively without external pullup, enabling direct interface to μP reset inputs requiring active-high assertion.
Unlike MXD1813/MXD1818, it lacks manual-reset debounce circuitry and does not respond to external low pulses on RESET - RESET is strictly VCC-monitored. The device uses BiCMOS process technology and ignores fast VCC transients ≤1.5μs at 4.62V overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.37V ±2.5% over -40°C to +105°C - ensures reliable reset assertion before +5V system brownout |
| Reset Timeout Period | 100ms minimum - guarantees sufficient μP initialization time after VCC recovery |
| Supply Current | 4μA typical at +3.6V - enables multi-year battery life in portable applications |
| Operating Voltage Range | +1.0V to +5.5V - supports valid RESET output down to VCC = +1V, critical for low-voltage sequencing |
| Output Type | Active-high push-pull - eliminates need for external pullup resistor and simplifies PCB layout |
| Package | 3-pin SC70 - 2.0mm × 2.1mm footprint ideal for space-constrained portable designs |
| Temperature Range | -40°C to +105°C - qualified for industrial and extended-temperature embedded systems |
Pinout & Package
MXD1812XR44+ is housed in a 3-pin SC70 package (outline X3-2, land pattern 90-0208) with 0.65mm pitch. Pin 1 is RESET (active-high push-pull), Pin 2 is VCC (supply and threshold monitor input), and Pin 3 is GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output - drives high when VCC ≥ 4.37V; pulls low when VCC < 4.37V and holds low for ≥100ms after recovery |
| 2 | VCC | Power supply input and reset threshold reference - powers internal comparator and timer; monitored continuously |
| 3 | GND | Ground reference - provides return path for internal circuitry and output stage |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 4.37V threshold | Eliminates external resistor divider calibration and reduces BOM count in +5V systems |
| Active-high push-pull output | Directly interfaces with μPs requiring active-high reset (e.g., certain ARM Cortex-M variants) without pullup components |
| 4μA supply current | Enables integration into always-on subsystems (e.g., RTC backup rails) without significant battery drain |
| 100ms fixed reset timeout | Guarantees μP core and peripherals fully stabilize before release - no timing capacitor required |
| VCC monitoring down to +1V | Ensures deterministic reset behavior during deep brownout, preventing undefined μP states |
Applications
| Computers and Controllers | Intelligent Instruments |
|---|---|
Use Scenario: Monitoring +5V rail in industrial PLC controllers during mains fluctuation or backup battery switchover. IC Role / Device Role / Timing Role: Supervisory reset generator asserting active-high signal to ARM-based controller's nRESET pin via level-shifted interface. Use Value: Prevents firmware lockup by guaranteeing ≥100ms reset hold time even as VCC recovers from 4.2V to 4.5V. | Use Scenario: Power sequencing in handheld multimeters with dual-supply analog front-end and digital display subsystem. IC Role / Device Role / Timing Role: Reset supervisor ensuring microcontroller initializes only after stable +5V rail is confirmed. Use Value: 4μA quiescent current extends alkaline battery life beyond 3 years in sleep mode. |
| Set-Top Boxes | Portable/Battery-Powered Equipment |
Use Scenario: Cold-start reliability in cable STBs using legacy +5V logic rails and flash memory boot sequence. IC Role / Device Role / Timing Role: Voltage monitor triggering active-high reset to MIPS CPU before DDR initialization begins. Use Value: 4.37V threshold aligns with +5V tolerance limits (±5%), avoiding spurious resets during nominal ripple. | Use Scenario: Low-power medical sensor node powered by coin cell, requiring fail-safe boot after battery insertion. IC Role / Device Role / Timing Role: Primary reset source asserting active-high signal to ultra-low-power MCU upon VCC crossing 4.37V. Use Value: Valid RESET output down to VCC = +1V ensures deterministic state even during gradual battery depletion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TR44+T | Same 4.37V threshold, SOT23-3 package, but active-low open-drain output with internal 5.5kΩ pullup | Requires external pullup for active-high logic; incompatible with direct active-high μP reset pins | Select when board already uses open-drain reset topology or shares RESET bus with multiple devices |
| TPS3808G33DBVR | 3.3V threshold (not 4.37V); adjustable via external resistor; 350nA IQ; SOT23-6 package | Designed for +3.3V systems; requires external components for threshold setting and timing | Select only for +3.3V applications needing ultra-low IQ or programmable timeout - not a functional substitute for MXD1812XR44+ |
Compared with MAX809TR44+T, MXD1812XR44+ eliminates pullup resistors and simplifies layout for active-high reset paths; compared with TPS3808G33DBVR, it offers drop-in 4.37V +5V-system compatibility without external components or configuration overhead.
Availability
MXD1812XR44+ 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 MXD1812XR44+ 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, mixed-signal, and power management ICs for industrial, computing, and consumer applications.
The MXD1810–MXD1818 family delivers low-cost, space-efficient μP reset supervision for +5V and +3.3V systems, emphasizing minimal external components, wide temperature operation, and robust transient immunity.
FAQ
What is the reset output polarity and drive type of MXD1812XR44+?
MXD1812XR44+ features an active-high push-pull RESET output. When VCC is above 4.37V, RESET is driven high; when VCC drops below threshold, RESET is actively pulled low and held low for ≥100ms after VCC recovers. This eliminates need for external pullup resistors and directly drives μP reset pins requiring active-high assertion. MXD1812XR44+ does not use open-drain or active-low configurations.
Does MXD1812XR44+ support manual reset via the RESET pin?
No, MXD1812XR44+ does not support manual reset. Unlike MXD1813/MXD1818, it lacks debounced manual-reset detection circuitry. The RESET pin is output-only and cannot be used as an input for external push-button assertion. Any attempt to pull RESET low externally will conflict with internal output drivers and is not supported per Absolute Maximum Ratings.
What is the minimum VCC required for MXD1812XR44+ to guarantee valid RESET output logic levels?
MXD1812XR44+ guarantees valid RESET/RESET logic states down to VCC = +1.0V across the full -40°C to +105°C temperature range. Below +1.0V, output drive strength degrades and logic levels become indeterminate. For applications requiring valid reset down to VCC = 0V, a 100kΩ pullup resistor between RESET and VCC is recommended per Maxim Application Note.
Is MXD1812XR44+ compatible with +3.3V systems?
No, MXD1812XR44+ is designed specifically for +5V systems. Its 4.37V reset threshold is optimized to detect brownout in +5V rails (±5% tolerance). Using it in +3.3V systems would cause immediate, permanent reset assertion since VCC never reaches the 4.37V threshold. For +3.3V applications, select MXD1817XRxx+ variants (e.g., MXD1817XR29+ with 2.88V threshold).
What package and RoHS status does MXD1812XR44+ use?
MXD1812XR44+ uses the 3-pin SC70 package (X3-2 outline, 2.0mm × 2.1mm) and is lead(Pb)-free. The "+" suffix in the part number explicitly denotes RoHS-compliant, lead-free packaging per Maxim's ordering convention - replacing "-T" with "+T" (or "+" in SC70 variants) confirms compliance.
MXD1812XR44+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MXD1812XR44+ FAQ
1.How can I place an order for MXD1812XR44+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1812XR44+ 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 MXD1812XR44+ reliable?
The price and inventory of MXD1812XR44+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1812XR44+ is usually 5 days.
3.What payment methods are accepted for MXD1812XR44+?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1812XR44+?
MXD1812XR44+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1812XR44+ 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 MXD1812XR44+?
For technical support, including MXD1812XR44+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1812XR44+ requirements.
6.How does Aetrix verify that MXD1812XR44+ is sourced from the original manufacturer or authorized distributors?
All MXD1812XR44+ 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 MXD1812XR44+ meets industry standards.
7.What is the process for return or replacement of MXD1812XR44+?
All MXD1812XR44+ units undergo pre-shipment inspection (PSI). If there is an issue with MXD1812XR44+, 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 MXD1812XR44+ part is unused and in its original packaging.
Return procedure for MXD1812XR44+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MXD1812XR44+ Tags
-
MIC826SYMT-TR
Microchip Technology
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APX803S-31SA-7
Diodes Incorporated
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APX803L20-29SA-7
Diodes Incorporated
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V6340RSP3B+
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EM6325CXSP5B-2.9+
EM Microelectronic
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MCP120T-300I/TT
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MCP130T-315I/TT
Microchip Technology
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MCP120T-475I/TT
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MCP111T-300E/TT
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MCP120T-315I/TT
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