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Analog Devices Inc./Maxim Integrated MXD1811XR46
- Part No.:
- MXD1811XR46
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MXD1811XR46.pdf
- Description:
- IC SUPERVISOR MICROPROCES RESET
- Quantity:
- Payment:
- Shipping:
Inventory:2,072
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Product details
Overview
MXD1811XR46 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 4.62V (±2.5% over temperature), maintains reset for ≥100ms after VCC recovery, draws only 4µA typical supply current, and features an internal 5.5kΩ pullup resistor - ideal for portable equipment and critical μP monitoring.
For engineers reviewing the MXD1811XR46 datasheet, MXD1811XR46 pinout, MXD1811XR46 application, or MXD1811XR46 equivalent, key selection criteria include its 4.62V reset threshold, SC70-3 package, open-drain output with internal pullup, guaranteed operation down to VCC = +1V, and immunity to fast VCC transients.
Technical Context
The MXD1811XR46 implements a precision bandgap-based reset comparator with ±2.5% threshold accuracy across –40°C to +105°C, coupled to a fixed 100ms minimum timeout timer triggered on VCC rise above threshold. Its open-drain output architecture enables direct interfacing with bidirectional μP reset pins without external components.
Unlike push-pull variants, MXD1811XR46 lacks manual-reset debounce functionality (exclusive to MXD1813/MXD1818) and does not support external pushbutton assertion of reset. It is factory-trimmed for 4.62V threshold and specified for 5V systems only.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.62V ±2.5% - ensures reliable reset assertion before 5V system brownout affects logic integrity |
| Supply Current | 4µA typical at +3.6V - enables multi-year battery life in portable applications |
| Reset Timeout | 100ms minimum - guarantees sufficient hold time for full μP initialization sequence | VCC Operating Range | 1.0V to 5.5V - supports valid reset output down to near-dead-battery conditions |
| Output Type | Open-drain, active-low - allows wired-OR configuration and compatibility with bidirectional μP reset pins |
| Internal Pullup | 5.5kΩ - eliminates need for external resistor while enabling I²C-style bus sharing |
| Package | SC70-3 - 1.25mm × 2.1mm footprint ideal for space-constrained PCB layouts |
Pinout & Package
MXD1811XR46 is housed in a 3-pin SC70 package (outline X3-2, land pattern 90-0208), measuring 1.25mm × 2.1mm × 0.95mm, rated for –40°C to +105°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Open-drain, active-low reset output; requires external pullup only if interfacing with non-5V-tolerant inputs |
| 2 | VCC | Power supply input and reset threshold reference; monitors system rail directly |
| 3 | GND | Analog ground reference for comparator and timer circuits; must be low-impedance path to system ground |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.62V reset threshold | ±2.5% tolerance over full temperature range ensures consistent brownout protection in 5V systems |
| No external components required | Integrated pullup resistor and comparator eliminate BOM cost and layout area for discrete reset circuits |
| Low 4µA supply current | Enables use in always-on battery-backed subsystems without measurable impact on standby life |
| VCC = +1V operation guarantee | Ensures predictable reset state even during deep discharge or power-fail transitions |
| Transient-immune comparator | Rejects sub-5µs negative VCC glitches, preventing spurious resets in noisy power environments |
Applications
| Computers and Controllers | Intelligent Instruments |
|---|---|
Use Scenario: Monitoring 5V power rails in industrial PLC controllers during mains fluctuation or backup battery switchover. IC Role / Device Role / Timing Role: Active-low reset supervisor asserting RESET until VCC stabilizes above 4.62V and holds for ≥100ms. Use Value: Prevents controller lockup or corrupted register states during brief brownouts by enforcing deterministic restart timing. | Use Scenario: Ensuring clean boot sequence in handheld multimeters powered by alkaline batteries. IC Role / Device Role / Timing Role: Open-drain RESET output interfaces directly with MCU's bidirectional reset pin without external components. Use Value: Eliminates need for discrete pullup resistor, reducing component count and PCB area in compact instrument designs. |
| Set-Top Boxes | Printers |
Use Scenario: Supervising 5V standby and main rails in digital cable receivers subject to repeated AC cycling. IC Role / Device Role / Timing Role: Monitors VCC and asserts open-drain RESET to prevent partial firmware execution during unstable power-up. Use Value: Guarantees full reset assertion for ≥100ms after VCC exceeds 4.62V, eliminating boot failures from marginal supply ramp rates. | Use Scenario: Protecting printer mainboard MCUs from erratic behavior during 5V rail collapse caused by motor startup current surges. IC Role / Device Role / Timing Role: Reset comparator ignores <5µs transients while triggering full 100ms reset on sustained undervoltage. Use Value: Avoids false resets during normal high-current events while ensuring robust response to actual brownout conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TR46LKA+ | Same 4.62V threshold, SOT23-3 package, push-pull output (not open-drain) | Requires external pullup for bidirectional μP reset pins; incompatible with wired-OR configurations | Select when push-pull drive strength (350µA source) is preferred over open-drain flexibility |
| TPS3808G33DBVR | 3.3V threshold (not 4.62V); adjustable via external resistor; 1.5µA quiescent current | Designed for 3.3V systems; unsuitable for 5V brownout detection without level-shifting | Choose only for 3.3V applications requiring ultra-low power or programmable threshold |
Compared with MAX809TR46LKA+ and TPS3808G33DBVR, MXD1811XR46 uniquely combines 5V-system-specific 4.62V reset threshold, open-drain output with integrated pullup, and SC70-3 footprint - making it optimal for space-constrained 5V designs requiring bidirectional reset pin compatibility and zero external components.
Availability
MXD1811XR46 is available at Aetrix Electronics and suitable for computers and controllers, intelligent instruments, and set-top boxes requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MXD1811XR46 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) is a semiconductor company specializing in analog, mixed-signal, and power management ICs for industrial, computing, and communications applications.
The MXD1810–MXD1818 family was designed specifically for low-power, high-accuracy microprocessor reset supervision in space-constrained 5V and 3.3V systems - emphasizing minimal external components, wide temperature operation, and transient immunity.
FAQ
What is the exact reset threshold voltage of MXD1811XR46 and how tightly is it specified?
MXD1811XR46 has a factory-set reset threshold of 4.62V, with ±2.5% accuracy guaranteed over the full operating temperature range of –40°C to +105°C. This specification ensures consistent brownout detection across environmental extremes without calibration or external trimming.
Does MXD1811XR46 support manual reset via an external pushbutton?
No, MXD1811XR46 does not include manual-reset debounce functionality. That feature is exclusive to MXD1813 and MXD1818 variants. MXD1811XR46 provides only power-supply monitoring and automatic reset assertion - no external RESET pin assertion capability.
What package type and dimensions does MXD1811XR46 use?
MXD1811XR46 uses the SC70-3 package (outline X3-2), measuring 1.25mm × 2.1mm × 0.95mm with a 0.65mm pin pitch. Its compact size supports high-density PCB layouts in portable and space-constrained applications.
Can MXD1811XR46 operate reliably at very low supply voltages?
Yes, MXD1811XR46 guarantees correct RESET logic state down to VCC = +1.0V, and operates across 1.0V to 5.5V. However, its internal pullup resistor and open-drain output may not maintain valid logic levels below ~1.2V - design validation is recommended for sub-1.2V use cases.
Is an external pullup resistor required when using MXD1811XR46?
No, MXD1811XR46 includes an internal 5.5kΩ pullup resistor on its open-drain RESET pin, eliminating the need for external components in standard 5V interface applications. An external pullup is only necessary if interfacing with non-5V-tolerant inputs or requiring different pullup strength.
MXD1811XR46 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:
- 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:
- SC-70-3
MXD1811XR46 FAQ
1.How can I place an order for MXD1811XR46 through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1811XR46 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 MXD1811XR46 reliable?
The price and inventory of MXD1811XR46 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1811XR46 is usually 5 days.
3.What payment methods are accepted for MXD1811XR46?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1811XR46 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1811XR46?
MXD1811XR46 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1811XR46 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 MXD1811XR46?
For technical support, including MXD1811XR46 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1811XR46 requirements.
6.How does Aetrix verify that MXD1811XR46 is sourced from the original manufacturer or authorized distributors?
All MXD1811XR46 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 MXD1811XR46 meets industry standards.
7.What is the process for return or replacement of MXD1811XR46?
All MXD1811XR46 units undergo pre-shipment inspection (PSI). If there is an issue with MXD1811XR46, 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 MXD1811XR46 part is unused and in its original packaging.
Return procedure for MXD1811XR46:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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MIC826SYMT-TR
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