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Analog Devices Inc./Maxim Integrated MXD1812XR46
- Part No.:
- MXD1812XR46
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MXD1812XR46.pdf
- Description:
- IC SUPERVISOR MICROPROCES RESET
- Quantity:
- Payment:
- Shipping:
Inventory:2,507
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Product details
Overview
MXD1812XR46 from Maxim Integrated is a precision microprocessor reset supervisor IC designed for +5V systems, featuring an active-high push-pull RESET output, 4.62V factory-trimmed reset threshold (±2.5% over temperature), 100ms minimum reset timeout, and operation down to VCC = +1V. It monitors supply voltage integrity in embedded controllers and portable equipment to prevent erroneous code execution during power-up, brownout, or power-down.
For engineers reviewing the MXD1812XR46 datasheet, MXD1812XR46 pinout, MXD1812XR46 application, or MXD1812XR46 equivalent, key selection criteria include its active-high push-pull output logic, guaranteed reset assertion at VCC ≥ 1V, SC70-3 package compatibility, and immunity to fast VCC transients up to 100µs at 100mV overdrive.
Technical Context
The MXD1812XR46 integrates a precision bandgap-based voltage comparator with hysteresis and a monolithic timer circuit to generate a fixed 100ms (min) reset pulse upon VCC recovery. Its internal architecture ensures reset remains asserted during VCC fall below 4.62V and sustains the high-level output for the full timeout after VCC rises above threshold.
No external components are required: the device uses a single-supply input (VCC), provides rail-to-rail RESET output drive capability (350µA source, 10mA sink), and maintains valid logic states across -40°C to +105°C without calibration or trimming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.62V ±2.5% over -40°C to +105°C - ensures reliable detection of +5V supply collapse before system instability occurs |
| Reset Timeout Period | 100ms (min) - guarantees sufficient processor initialization time after VCC recovery |
| Supply Current | 4µA typical at +3.6V - enables use in battery-powered systems with multi-year standby life |
| VCC Operating Range | +1.0V to +5.5V - supports valid RESET output even during deep brownout conditions |
| Output Type | Active-high push-pull - eliminates need for external pullup resistor and interfaces directly with µP reset inputs requiring high-active assertion |
| 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 applications |
Pinout & Package
MXD1812XR46 is housed in a 3-pin SC70 package (outline X3-2, land pattern 90-0208), with pin 1 = RESET (active-high push-pull), pin 2 = VCC (supply and threshold monitor input), pin 3 = GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output - drives high during normal operation; pulls low only during reset assertion (not applicable to MXD1812); remains high for ≥100ms after VCC recovers above 4.62V |
| 2 | VCC | Power supply input and reset threshold reference - supplies internal circuitry and serves as the monitored voltage rail |
| 3 | GND | Ground reference - establishes common return path for internal comparator and output stage |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 4.62V reset threshold | Eliminates external resistor network and calibration effort for +5V system monitoring |
| Active-high push-pull RESET output | Direct interface with microprocessors requiring high-active reset (e.g., certain ARM Cortex-M variants) |
| 100ms minimum reset timeout | Guarantees sufficient time for flash memory initialization and PLL lock in modern µPs |
| 4µA supply current | Enables integration into always-on subsystems without compromising battery runtime |
| VCC = +1V operation guarantee | Maintains deterministic reset state during severe brownout, preventing undefined µP behavior |
Applications
| Industrial Controllers | Portable Medical Devices |
|---|---|
Use Scenario: Monitoring 5V auxiliary rails in PLC I/O modules subject to intermittent power faults. IC Role / Device Role / Timing Role: Supervisory reset generator asserting active-high signal to ARM-based controller on VCC dip below 4.62V. Use Value: Prevents firmware corruption during field-deployed brownouts by enforcing 100ms minimum reset hold time post-recovery. |
Use Scenario: Power sequencing in handheld ultrasound units powered by Li-ion batteries with variable discharge profiles. IC Role / Device Role / Timing Role: Ensures clean boot of DSP core when main 5V DC-DC output stabilizes after battery wake-up. Use Value: Guarantees RESET remains valid down to VCC = +1V, enabling safe restart even under deeply discharged battery conditions. |
| Set-Top Box Power Management | Smart Meter Data Logging |
Use Scenario: Protecting firmware execution during AC line sags affecting 5V system rail in cable TV gateways. IC Role / Device Role / Timing Role: Active-high reset supervisor interfacing with MIPS-based SoC reset input requiring high-active assertion. Use Value: Push-pull output avoids reliance on weak SoC internal pullups, ensuring robust noise-immune reset signaling. |
Use Scenario: Securing accurate timestamping during power interruptions in AMI meters using backup supercapacitors. IC Role / Device Role / Timing Role: Monitors 5V backup rail and asserts active-high reset to secure MCU if voltage drops below 4.62V. Use Value: Low 4µA quiescent current extends supercapacitor hold-up time, preserving data integrity across longer outages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TR46D3T | Same 4.62V threshold, SOT23-3 package, but active-low open-drain output with internal 5.5kΩ pullup | Requires level-shifting or redesign for µPs needing active-high reset; compatible where bidirectional reset pins exist | Select when interfacing with legacy µPs specifying active-low reset and supporting open-drain topology |
| TPS3808G33DBVR | 3.3V threshold, adjustable via external resistor; 350ms timeout; 1.5µA supply current; SOT23-5 package | Not pin-compatible; requires PCB layout change and external component for threshold setting | Choose for ultra-low-power applications where 3.3V monitoring suffices and longer timeout is acceptable |
Compared with MXD1812XR46, MAX809TR46D3T offers identical threshold accuracy but mandates active-low system integration, while TPS3808G33DBVR trades pin compatibility for lower quiescent current and programmable timing-neither is a drop-in replacement due to output polarity or package mismatch.
Availability
MXD1812XR46 is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, set-top boxes, smart meters, and battery-powered instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MXD1812XR46 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 consumer applications, emphasizing reliability, low power, and small-footprint solutions.
The MXD1812XR46 belongs to the MXD1810–MXD1818 family of microprocessor reset supervisors, engineered specifically for cost-sensitive, space-constrained embedded systems requiring guaranteed power-on reset and brownout protection without external components.
FAQ
What is the reset output logic polarity of the MXD1812XR46?
The MXD1812XR46 features an active-high push-pull RESET output. During normal operation (VCC > 4.62V), RESET is driven high; when VCC falls below the threshold, RESET transitions low for the duration of the reset timeout period. This differs from MXD1810/MXD1815 (active-low push-pull) and MXD1811/MXD1816 (active-low open-drain). The MXD1812XR46's output does not require an external pullup resistor.
Does the MXD1812XR46 support manual reset functionality?
No, the MXD1812XR46 does not include manual reset detection. That feature is exclusive to the MXD1813/MXD1818 variants, which assert reset upon a 1.5µs minimum low pulse on the RESET pin. The MXD1812XR46 is a dedicated supply-monitoring supervisor with automatic reset generation only-no external push-button interface capability.
What is the minimum VCC voltage at which MXD1812XR46 guarantees valid RESET output?
The MXD1812XR46 guarantees correct RESET logic state down to VCC = +1.0V across the full operating temperature range (-40°C to +105°C). Below this voltage, output drive strength degrades, but the device maintains defined behavior through its entire specified operating range-critical for brownout resilience in battery-powered systems.
Can MXD1812XR46 be used in +3.3V systems?
No, MXD1812XR46 is factory-configured for +5V systems with a 4.62V reset threshold. Using it in +3.3V applications would cause continuous reset assertion since VCC never exceeds the threshold. For +3.3V monitoring, select MXD1815–MXD1818 variants with suffixes R29 (2.88V), R31 (3.06V), or R26 (2.55V), such as MXD1815XR29.
What package type and footprint does MXD1812XR46 use?
MXD1812XR46 is supplied in a 3-pin SC70 package (outline X3-2, land pattern 90-0208), measuring 2.0mm × 2.1mm with 0.65mm lead pitch. It is pin-compatible with other SC70-3 reset supervisors and offers significantly smaller area than SOT23-3 alternatives-ideal for compact portable and wearable electronics designs.
MXD1812XR46 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:
- 4.62V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MXD1812XR46 FAQ
1.How can I place an order for MXD1812XR46 through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1812XR46 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 MXD1812XR46 reliable?
The price and inventory of MXD1812XR46 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1812XR46 is usually 5 days.
3.What payment methods are accepted for MXD1812XR46?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1812XR46 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1812XR46?
MXD1812XR46 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1812XR46 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 MXD1812XR46?
For technical support, including MXD1812XR46 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1812XR46 requirements.
6.How does Aetrix verify that MXD1812XR46 is sourced from the original manufacturer or authorized distributors?
All MXD1812XR46 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 MXD1812XR46 meets industry standards.
7.What is the process for return or replacement of MXD1812XR46?
All MXD1812XR46 units undergo pre-shipment inspection (PSI). If there is an issue with MXD1812XR46, 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 MXD1812XR46 part is unused and in its original packaging.
Return procedure for MXD1812XR46:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MXD1812XR46 Tags
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MIC826SYMT-TR
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APX803L20-29SA-7
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