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Analog Devices Inc./Maxim Integrated MXD1812XR44
- Part No.:
- MXD1812XR44
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MXD1812XR44.pdf
- Description:
- IC SUPERVISOR MICROPROCES RESET
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MXD1812XR44 from Maxim Integrated is a precision 3-pin 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 power supplies in embedded controllers and portable systems, asserting reset during brownout and power-up sequencing.
For engineers reviewing the MXD1812XR44 datasheet, MXD1812XR44 pinout, MXD1812XR44 application, or MXD1812XR44 equivalent, key selection criteria include its active-high push-pull output configuration, SC70-3 package footprint, 4μA supply current, and compatibility with manual-reset-free designs requiring deterministic reset assertion without external components.
Technical Context
The MXD1812XR44 integrates a precision voltage comparator with hysteresis and an internal 100ms timeout timer. Its reset logic asserts RESET high when VCC falls below 4.37V and holds it high for ≥100ms after VCC rises above threshold - no external capacitor or resistor required.
Unlike MXD1813/MXD1818 variants, MXD1812XR44 lacks manual-reset input detection and debouncing circuitry. It uses BiCMOS process technology and features transient immunity against fast VCC glitches up to 100µs at 200mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.37V ±2.5% over -40°C to +105°C - ensures reliable brownout detection for +5V systems |
| Reset Timeout Period | 100ms minimum - guarantees sufficient processor initialization time before release |
| Supply Current | 4µA typical at +3.6V - enables battery-powered operation for >10 years in low-duty-cycle systems |
| VCC Operating Range | +1.0V to +5.5V - supports valid RESET output even during deep brownout conditions |
| Output Type | Active-high push-pull - drives high without external pullup, compatible with μP reset inputs requiring active-high assertion |
| Package | 3-pin SC70 - 2.0mm × 1.25mm footprint, 0.65mm pitch, suitable for space-constrained PCB layouts |
| Temperature Range | -40°C to +105°C - qualified for industrial and extended-temperature embedded applications |
Pinout & Package
MXD1812XR44 is housed in a 3-pin SC70 package (outline X3-2, land pattern 90-0208). Pin 1 is RESET (active-high push-pull output), 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 - sinks current when reset inactive, sources current when asserted; no external pullup needed |
| 2 | VCC | Power supply input and reset threshold reference - powers internal circuitry and sets comparator trip point |
| 3 | GND | Ground reference - provides return path for RESET sink current and establishes VCC measurement baseline |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | Factory-trimmed 4.37V with ±2.5% accuracy across full temperature range - eliminates calibration overhead |
| No external components | Self-contained reset timing and voltage monitoring - reduces BOM count and layout area vs. RC-based solutions |
| Low-power operation | 4µA typical supply current - extends battery life in portable instrumentation and IoT edge nodes |
| VCC = +1V reset validity | Guaranteed RESET logic state integrity down to 1.0V supply - prevents undefined behavior during deep undervoltage |
| Transient immunity | Immune to VCC glitches ≤100µs at 200mV overdrive - avoids spurious resets in noisy power environments |
Applications
| Computers and Controllers | Intelligent Instruments |
|---|---|
Use Scenario: Power-on reset sequencing in industrial PLC CPU modules with +5V rail. IC Role / Device Role / Timing Role: Monitors main +5V supply and asserts active-high RESET to ARM Cortex-M7 core until stable. Use Value: Ensures deterministic boot state by holding processor in reset for ≥100ms after VCC exceeds 4.37V, preventing code execution errors. |
Use Scenario: Battery-backed handheld multimeter with auto-power-down and wake-on-button. IC Role / Device Role / Timing Role: Provides clean power-up reset signal to MSP430 microcontroller while consuming only 4µA during sleep. Use Value: Enables >5-year battery life in storage mode while guaranteeing valid reset assertion down to VCC = +1V during partial discharge. |
| Set-Top Boxes | Printers |
Use Scenario: Dual-rail power supervision in cable STB with +5V main and +3.3V I/O rails. IC Role / Device Role / Timing Role: Dedicated +5V reset supervisor for SoC power domain, independent of +3.3V LDO status. Use Value: Prevents lockup during AC dropout by asserting reset within 5µs of VCC falling below 4.37V, with glitch immunity. |
Use Scenario: Reset management in laser printer engine controller with intermittent 5V standby rail. IC Role / Device Role / Timing Role: Generates active-high reset pulse to PIC32MX processor upon cold start or brownout recovery. Use Value: Eliminates need for discrete RC network and pullup resistor, reducing component count and improving timing consistency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TR44D3T | 4.40V reset threshold, SOT23-3, open-drain active-low output, 1.6µA supply current | Requires external pullup; incompatible with active-high reset inputs; lower quiescent current | Select when system uses open-drain reset bus shared with other peripherals |
| TPS3808G33DBVR | 3.3V reset threshold, SOT23-6, adjustable delay via capacitor, 16µA supply current | Fixed 3.3V threshold unsuitable for +5V systems; requires external timing capacitor | Select only if redesigning for 3.3V supply monitoring with programmable timeout |
Compared with MAX809TR44D3T and TPS3808G33DBVR, MXD1812XR44 offers the unique combination of 4.37V threshold, active-high push-pull output, and ultra-low 4µA supply current in SC70 - making it optimal for space- and power-constrained +5V microcontroller reset applications where external components must be eliminated.
Availability
MXD1812XR44 is available at Aetrix Electronics and suitable for industrial controllers, portable test equipment, and consumer electronics 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 and mixed-signal ICs for industrial, communications, and computing markets, with emphasis on reliability and integration.
MXD1812XR44 belongs to the MXD1810–MXD1818 family of low-power μP reset circuits - engineered specifically for compact, battery-sensitive applications requiring accurate voltage monitoring and deterministic reset timing without external components.
FAQ
What is the reset threshold voltage of MXD1812XR44 and how accurate is it over temperature?
The MXD1812XR44 has a factory-set reset threshold of 4.37V with ±2.5% accuracy over the full operating temperature range of -40°C to +105°C. This specification is guaranteed by design and verified across temperature extremes, ensuring consistent brownout detection in industrial environments without recalibration.
Does MXD1812XR44 support manual reset functionality via an external pushbutton?
No, MXD1812XR44 does not include manual reset detection circuitry. That feature is exclusive to MXD1813 and MXD1818 variants. MXD1812XR44 provides only power-supply monitoring and automatic reset assertion - no external RESET pin debouncing or pushbutton interface capability.
What is the output configuration of MXD1812XR44 and how does it interface with microprocessors?
MXD1812XR44 features an active-high push-pull RESET output. It drives high when reset is asserted and low when released, eliminating the need for an external pullup resistor. This configuration directly interfaces with microprocessors requiring active-high reset signals, such as certain ARM and Renesas MCUs.
Can MXD1812XR44 operate reliably at very low supply voltages?
Yes, MXD1812XR44 guarantees correct RESET/RESET logic state down to VCC = +1.0V. This ensures deterministic behavior during deep brownout conditions, unlike many reset ICs that become indeterminate below 1.8V - critical for fail-safe operation in battery-powered systems.
What package type is used for MXD1812XR44 and what are its key mechanical dimensions?
MXD1812XR44 is supplied in a 3-pin SC70 package (outline X3-2), measuring 2.0mm × 1.25mm with 0.65mm lead pitch. Its compact size and thermal performance make it ideal for high-density PCBs in portable and space-constrained embedded designs.
MXD1812XR44 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:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
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?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1812XR44 transactions.
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.
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