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Analog Devices Inc./Maxim Integrated MXD1818XR23+
- Part No.:
- MXD1818XR23+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MXD1818XR23+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,479
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Product details
Overview
MXD1818XR23+ from Maxim Integrated is a low-power microprocessor reset supervisor IC in SC70-3 package, designed for +2.5V/+3.0V/+3.3V systems with factory-set 2.31V reset threshold (±2.5% accuracy), 100ms minimum reset timeout, and debounced manual-reset capability via active-low open-drain RESET pin. It ensures reliable power-on/brownout reset for portable microcontroller applications.
For engineers reviewing the MXD1818XR23+ datasheet, MXD1818XR23+ pinout, MXD1818XR23+ application, or MXD1818XR23+ equivalent, key selection criteria include reset threshold tolerance, manual-reset debounce timing (1.5μs detection), VCC operating range down to +1.2V, and compatibility with bidirectional μP reset pins without external pullup.
Technical Context
The MXD1818XR23+ implements a precision bandgap-based voltage monitor with internal comparator and 100ms monostable timer. Its open-drain RESET output includes a factory-trimmed 5.5kΩ internal pullup resistor and supports manual reset initiation via externally pulled RESET pin held low ≥1.5μs.
This device operates across -40°C to +105°C, guarantees valid RESET assertion down to VCC = +1.2V, and rejects transients ≤20μs at 2.31V threshold overdrive - enabling robust operation in noisy battery-powered environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.31V ±2.5% - precise brownout detection for 2.5V/3.0V/3.3V rails |
| Reset Timeout Period | 100ms min - ensures sufficient μP initialization time after power recovery |
| Supply Current | 4μA typ at +3.6V - enables multi-year battery life in portable equipment |
| Operating Voltage Range | +1.2V to +5.5V - supports valid reset assertion even during deep brownout |
| Manual Reset Detection | 1.5μs minimum low pulse on RESET pin - debounces mechanical switch bounce |
| Output Type | Open-drain active-low with internal 5.5kΩ pullup - interfaces directly with bidirectional μP reset pins |
| Package | 3-pin SC70 - 2.0mm × 1.25mm footprint for space-constrained PCBs |
Pinout & Package
MXD1818XR23+ uses a 3-pin SC70 package (outline X3-2, land pattern 90-0208) with 0.65mm pitch. Pin 1 is RESET (open-drain active-low), Pin 2 is VCC (supply and threshold monitor input), and Pin 3 is GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Open-drain active-low reset output; internally pulled up to VCC; accepts manual reset trigger when pulled low ≥1.5μs |
| 2 | VCC | Power supply input and reset threshold reference; monitored continuously for brownout detection |
| 3 | GND | Ground reference for internal comparator and output stage; must be low-impedance for accurate threshold tracking |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 2.31V reset threshold | Eliminates external resistor divider; ±2.5% accuracy over full -40°C to +105°C range |
| Debounced manual-reset input | 1.5μs minimum pulse detection prevents false triggers from switch bounce in field-deployed equipment |
| Internal 5.5kΩ pullup resistor | Enables direct connection to bidirectional μP reset pins (e.g., Motorola 68HC11) without external components |
| 100ms fixed reset timeout | Guarantees μP core and peripherals fully stabilize before release; no timing capacitor required |
| 4μA typical supply current | Reduces quiescent load on coin-cell or Li-ion backup supplies in always-on monitoring circuits |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Battery-powered glucose meters and pulse oximeters requiring fail-safe boot sequence after battery insertion or voltage sag. IC Role / Device Role / Timing Role: Supervisory reset generator that asserts RESET until VCC exceeds 2.31V and sustains 100ms timeout, preventing corrupted firmware execution. Use Value: Guarantees deterministic startup under variable battery discharge profiles while consuming only 4μA during sleep mode. |
Use Scenario: DIN-rail mounted I/O modules exposed to 24VDC supply fluctuations in factory automation cabinets. IC Role / Device Role / Timing Role: Brownout detector monitoring local 3.3V logic rail; initiates controlled shutdown via PLC controller reset line upon undervoltage. Use Value: Prevents spurious I/O state changes during transient dips by holding reset for ≥100ms after recovery - meeting IEC 61000-4-29 immunity requirements. |
| Smart Home Hub Controllers | POS Terminal Power Management |
|
Use Scenario: Wi-Fi/BLE-enabled home hubs powered by USB-C PD adapters with variable output voltages. IC Role / Device Role / Timing Role: System-level reset supervisor ensuring clean boot when adapter negotiates 3.3V/5V; manual reset via front-panel button. Use Value: Debounced 1.5μs manual reset detection eliminates double-press artifacts, while 2.31V threshold matches typical LDO dropout margins. |
Use Scenario: Point-of-sale terminals using dual-supply architecture (5V main, 3.3V logic) with hot-swap capable power inputs. IC Role / Device Role / Timing Role: Dedicated 3.3V rail monitor asserting open-drain RESET to ARM Cortex-M host processor during brownout events. Use Value: Internal 5.5kΩ pullup allows direct connection to processor's bidirectional reset pin - eliminating BOM cost and layout area for external resistor. |
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 | Fixed 3.08V reset threshold; no manual reset detect; SOT23-3 only | Lacks pushbutton debounce; requires external RC for manual reset if needed | Select when 3.08V threshold suffices and board space permits SOT23; not suitable for 2.31V-critical 2.5V systems |
| TPS3808G125DBVR | Adjustable threshold via external resistor; 200ms timeout; higher 8μA ICC | Requires external components for threshold setting; longer timeout may delay system response | Choose for design flexibility where 2.31V precision isn't mandatory and longer reset hold is acceptable |
Compared with MXD1818XR23+, MAX809TRD3+T offers simpler integration but lacks manual reset debounce and precise 2.31V threshold, while TPS3808G125DBVR provides adjustability at the cost of added components and higher quiescent current - making MXD1818XR23+ optimal for compact, low-power 2.5V-system reset supervision.
Availability
MXD1818XR23+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart home hub controllers, and POS terminal power management requiring stable component supply across extended temperature ranges.
Supply support for MXD1818XR23+ 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 high-performance analog and mixed-signal ICs for power, sensing, and interface applications.
The MXD1818XR23+ belongs to the MXD1810–MXD1818 family of microprocessor reset supervisors, engineered specifically for low-power, space-constrained embedded systems requiring precision voltage monitoring and robust manual reset capability.
FAQ
What is the exact reset threshold voltage of MXD1818XR23+ and how tightly is it specified?
The MXD1818XR23+ has a factory-set reset threshold of 2.31V with ±2.5% accuracy over the full -40°C to +105°C operating temperature range. This value is guaranteed by design and verified per Electrical Characteristics table in the datasheet, making it suitable for precise brownout detection in 2.5V and 3.3V systems where margin below nominal rail is critical. The MXD1818XR23+ achieves this without external components.
Does MXD1818XR23+ support manual reset, and what are the timing requirements?
Yes, MXD1818XR23+ supports debounced manual reset via its open-drain RESET pin: a logic-low pulse ≥1.5μs triggers a full 100ms reset timeout period. This internal debounce eliminates false triggers from mechanical switch bounce. The device releases RESET only after the external switch is released and the 100ms timer expires - a behavior confirmed in Figure 6 and "Push-Button Reset" section of the datasheet.
What package type and footprint does MXD1818XR23+ use, and is it RoHS-compliant?
MXD1818XR23+ is supplied in a 3-pin SC70 package (outline X3-2, land pattern 90-0208), measuring 2.0mm × 1.25mm with 0.65mm lead pitch. The "+" suffix in the part number explicitly denotes lead(Pb)-free, RoHS-compliant packaging per Maxim's ordering conventions and Package Information section. Tape-and-reel delivery is standard at 2500 units per reel.
How does MXD1818XR23+ behave when VCC drops below 1.2V, and is RESET still valid?
MXD1818XR23+ guarantees valid RESET assertion down to VCC = +1.2V (minimum operating voltage), as specified in Absolute Maximum Ratings and Electrical Characteristics. Below this, output drive capability degrades; however, the device remains functional through full brownout. For applications requiring RESET validity down to 0V, an external pulldown resistor is recommended - though MXD1818XR23+'s open-drain structure inherently drifts high as VCC collapses.
Can MXD1818XR23+ interface directly with microcontrollers having bidirectional reset pins?
Yes, MXD1818XR23+ can interface directly with bidirectional reset pins (e.g., Motorola 68HC11) because its open-drain RESET output includes an internal 5.5kΩ pullup resistor to VCC. This eliminates the need for an external pullup, simplifying layout and reducing BOM count. The datasheet confirms this capability in "Interfacing to μPs with Bidirectional Reset Pins" and Pin Descriptions sections.
MXD1818XR23+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.31V
- Output:
- Open Drain, Bidirectional
- 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
MXD1818XR23+ FAQ
1.How can I place an order for MXD1818XR23+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1818XR23+ 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 MXD1818XR23+ reliable?
The price and inventory of MXD1818XR23+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1818XR23+ is usually 5 days.
3.What payment methods are accepted for MXD1818XR23+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1818XR23+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1818XR23+?
MXD1818XR23+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1818XR23+ 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 MXD1818XR23+?
For technical support, including MXD1818XR23+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1818XR23+ requirements.
6.How does Aetrix verify that MXD1818XR23+ is sourced from the original manufacturer or authorized distributors?
All MXD1818XR23+ 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 MXD1818XR23+ meets industry standards.
7.What is the process for return or replacement of MXD1818XR23+?
All MXD1818XR23+ units undergo pre-shipment inspection (PSI). If there is an issue with MXD1818XR23+, 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 MXD1818XR23+ part is unused and in its original packaging.
Return procedure for MXD1818XR23+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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