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Analog Devices Inc./Maxim Integrated MXD1816XR31+
- Part No.:
- MXD1816XR31+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MXD1816XR31+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,360
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Product details
Overview
MXD1816XR31+ from Maxim Integrated is an open-drain, active-low microprocessor reset supervisor IC designed for +2.5V/+3.0V/+3.3V digital systems. It monitors VCC supply voltage with a factory-trimmed 3.06V reset threshold (±2.5% over temperature), asserts reset for ≥100ms after VCC recovery, and includes an internal 5.5kΩ pullup resistor. It operates from -40°C to +105°C in SC70-3 package and draws only 4µA typical supply current.
For engineers reviewing the MXD1816XR31+ datasheet, MXD1816XR31+ pinout, MXD1816XR31+ application, or MXD1816XR31+ equivalent, key selection criteria include its 3.06V threshold accuracy, open-drain output compatibility with bidirectional µP reset pins, immunity to fast VCC transients, and suitability for portable/battery-powered equipment requiring guaranteed reset validity down to VCC = +1V.
Technical Context
The MXD1816XR31+ implements a precision bandgap-based voltage comparator to detect VCC drops below 3.06V, with built-in hysteresis and transient rejection logic that ignores negative-going VCC glitches shorter than ~1–2µs depending on overdrive. Its internal timer ensures minimum 100ms reset assertion after VCC rises above threshold, independent of supply ramp rate.
This device belongs to the MXD1815–MXD1818 subfamily optimized for 2.5V/3.0V/3.3V systems and features open-drain RESET output with integrated pullup - eliminating external components while enabling direct interface to µPs with bidirectional reset pins (e.g., Motorola 68HC11) without external pullup resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.06V ±2.5% over -40°C to +105°C - ensures reliable brownout detection for 3.3V systems with margin against noise-induced false resets |
| Reset Timeout Period | 100ms minimum - guarantees sufficient reset hold time for µP initialization across all operating conditions |
| Supply Current | 4µA typical at +3.6V - enables multi-year battery life in portable applications |
| Operating Voltage Range | +1.2V to +5.5V - supports valid reset assertion even during deep brownout down to 1.2V |
| Output Type | Open-drain, active-low with 5.5kΩ internal pullup - simplifies interfacing to bidirectional µP reset pins and eliminates external resistor |
| VCC Transient Immunity | Rejects <2µs negative transients at VTH – VCC ≥ 100mV - prevents spurious resets from switching noise or ESD coupling |
| Package | 3-pin SC70 (X3-2 outline) - 2.0mm × 1.25mm footprint ideal for space-constrained portable designs |
Pinout & Package
MXD1816XR31+ is housed in a 3-pin SC70 package (outline X3-2, land pattern 90-0208), with pin 1 as RESET (open-drain active-low), pin 2 as VCC (supply and threshold monitor input), and pin 3 as GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Open-drain, active-low reset output with internal 5.5kΩ pullup to VCC - sinks current when asserted; floats high when deasserted |
| 2 | VCC | Main supply input and reset-threshold reference source - powers internal comparator and timer; monitored continuously |
| 3 | GND | Analog and digital ground reference - must be low-impedance connection to system ground plane for accurate threshold detection |
Key Features
| Feature | Design Value |
|---|---|
| Precision 3.06V reset threshold | Factory-trimmed ±2.5% over full temperature range - eliminates need for external calibration or trimming components |
| No external components required | Integrated pullup resistor and comparator - reduces BOM count and PCB area vs. discrete reset solutions |
| Guaranteed operation down to VCC = +1.2V | Valid RESET output state maintained until supply falls below 1.2V - ensures deterministic behavior during power collapse |
| 100ms fixed reset timeout | Internally timed, temperature-stable delay - removes dependency on external RC networks and their drift |
| SC70-3 package | 2.0mm × 1.25mm × 0.9mm profile - enables use in ultra-compact wearables, IoT sensors, and handheld devices |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered glucose meters and pulse oximeters require reliable power-on reset and brownout protection during intermittent battery discharge. IC Role / Device Role / Timing Role: MXD1816XR31+ monitors 3.3V rail and asserts active-low reset to ARM Cortex-M0 MCU until stable supply is confirmed. Use Value: 4µA quiescent current extends single-CR2032 battery life beyond 5 years; 3.06V threshold aligns precisely with 3.3V LDO dropout margin. |
Use Scenario: DIN-rail mounted I/O modules operate in electrically noisy factory environments with fluctuating 24VDC-derived 3.3V supplies. IC Role / Device Role / Timing Role: MXD1816XR31+ provides immunity to fast transients on VCC caused by relay switching or motor drives, preventing unintended µP resets. Use Value: Rejects <2µs transients at 100mV overdrive - eliminates need for additional LC filtering on 3.3V rail, reducing component count and cost. |
| Smart Home Hub Controllers | Automotive Infotainment Subsystems |
Use Scenario: Wi-Fi/BLE-enabled home hubs integrate multiple SoCs sharing a common 3.3V PMIC rail subject to load-step-induced droop. IC Role / Device Role / Timing Role: MXD1816XR31+ detects VCC dips below 3.06V and holds all processors in reset until rail recovers and stabilizes for ≥100ms. Use Value: Fixed 100ms timeout ensures all subsystems (Wi-Fi, audio, USB) initialize synchronously - avoids race conditions and firmware lockups. |
Use Scenario: Display/audio processors in infotainment head units must survive cold-crank (4.5V) and load-dump (18V) events on vehicle 12V bus. IC Role / Device Role / Timing Role: MXD1816XR31+ supervises the 3.3V domain derived from a wide-input DC-DC converter, asserting reset during undervoltage faults. Use Value: Operation from -40°C to +105°C and guaranteed reset validity to VCC = +1.2V ensure robustness across automotive thermal profiles and battery sag 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 |
|---|---|---|---|
| MAX809TRD3+T | 3.08V threshold, SOT23-3 package, 1.6µA ICC, no internal pullup - requires external 100kΩ pullup for open-drain interface | Lacks integrated pullup; less suitable for bidirectional µP reset pins without added component | Select when lowest possible supply current is critical and external pullup is acceptable |
| TPS3808G30DBVR | 3.0V threshold, SOT23-6 package, adjustable timeout (200ms default), 1.5µA ICC, push-pull output - no internal pullup | Push-pull output incompatible with bidirectional µP reset pins unless external open-drain buffer added | Select when precise timeout control or lower ICC outweighs need for open-drain simplicity |
Compared with MXD1816XR31+, MAX809TRD3+T offers lower ICC but requires external pullup, increasing BOM and layout complexity; TPS3808G30DBVR provides tighter threshold tolerance and programmable timeout but lacks native open-drain functionality - making MXD1816XR31+ optimal for space-constrained, low-component-count 3.3V µP supervision.
Availability
MXD1816XR31+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart home hub controllers, and automotive infotainment subsystems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MXD1816XR31+ 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, communications, and consumer applications.
The MXD1815–MXD1818 product line delivers ultra-low-power, precision reset supervision for 2.5V/3.0V/3.3V systems - engineered specifically for battery-operated and thermally demanding embedded applications where reliability and minimal footprint are essential.
FAQ
What is the exact reset threshold voltage of MXD1816XR31+ and how stable is it over temperature?
The MXD1816XR31+ has a factory-set reset threshold of 3.06V 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 process corners - ensuring consistent brownout detection in portable and industrial environments without recalibration.
Does MXD1816XR31+ require an external pullup resistor on the RESET pin?
No, MXD1816XR31+ includes an internal 5.5kΩ pullup resistor to VCC on its open-drain RESET output. This eliminates the need for an external pullup and enables direct connection to microprocessors with bidirectional reset pins - such as the Motorola 68HC11 - without additional components.
Can MXD1816XR31+ be used in 5V systems?
No, MXD1816XR31+ is specified for 2.5V/3.0V/3.3V systems only, with a 3.06V reset threshold optimized for those rails. For 5V applications, select MXD1810–MXD1813 variants (e.g., MXD1810XR41+) with thresholds from 4.12V to 4.62V - MXD1816XR31+ may assert reset prematurely in 5V environments.
What is the minimum VCC voltage at which MXD1816XR31+ guarantees valid RESET output state?
MXD1816XR31+ guarantees valid RESET logic state (high-impedance or pulled high via internal resistor) down to VCC = +1.2V over temperature. Below this, output behavior is not specified - however, the device remains functional and asserts reset correctly down to +1.0V per absolute maximum ratings.
Is MXD1816XR31+ compatible with mechanical push-button manual reset circuits?
No, MXD1816XR31+ does not include manual reset detection circuitry. That feature is exclusive to MXD1813/MXD1818 variants (e.g., MXD1818XR31+). MXD1816XR31+ provides only power-supply monitoring and automatic reset assertion - external button interfaces require separate debounced logic or a different variant.
MXD1816XR31+ 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:
- 3.06V
- 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
MXD1816XR31+ FAQ
1.How can I place an order for MXD1816XR31+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1816XR31+ 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 MXD1816XR31+ reliable?
The price and inventory of MXD1816XR31+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1816XR31+ is usually 5 days.
3.What payment methods are accepted for MXD1816XR31+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1816XR31+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1816XR31+?
MXD1816XR31+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1816XR31+ 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 MXD1816XR31+?
For technical support, including MXD1816XR31+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1816XR31+ requirements.
6.How does Aetrix verify that MXD1816XR31+ is sourced from the original manufacturer or authorized distributors?
All MXD1816XR31+ 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 MXD1816XR31+ meets industry standards.
7.What is the process for return or replacement of MXD1816XR31+?
All MXD1816XR31+ units undergo pre-shipment inspection (PSI). If there is an issue with MXD1816XR31+, 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 MXD1816XR31+ part is unused and in its original packaging.
Return procedure for MXD1816XR31+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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