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Analog Devices Inc./Maxim Integrated MXD1818XR23+T
- Part No.:
- MXD1818XR23+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MXD1818XR23+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,170
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Product details
Overview
MXD1818XR23+T from Maxim Integrated is a low-power, open-drain, active-low microprocessor reset circuit in SC70-3 package, designed for +2.5V/+3.0V/+3.3V systems with factory-set 2.31V reset threshold, 100ms minimum reset timeout, and debounced manual-reset capability. It monitors VCC supply voltage, asserts RESET when VCC falls below threshold, and maintains reset for ≥100ms after VCC recovery - ideal for portable battery-powered microcontroller systems requiring reliable power-on/brownout reset.
For engineers reviewing the MXD1818XR23+T datasheet, MXD1818XR23+T pinout, MXD1818XR23+T application, or MXD1818XR23+T equivalent, key selection criteria include its 2.31V ±2.5% threshold accuracy over -40°C to +105°C, 4μA typical supply current, internal 5.5kΩ pullup resistor, manual-reset detect sensitivity (1.5μs low pulse), and guaranteed RESET validity down to VCC = +1V.
Technical Context
The MXD1818XR23+T implements a precision bandgap-based reset comparator with transient immunity, asserting an open-drain active-low RESET output when VCC drops below 2.31V (±2.5% over temperature). Its internal timer guarantees ≥100ms reset assertion after VCC rises above threshold or after release of a debounced manual reset signal.
As part of the MXD1815–MXD1818 subfamily, it supports +2.5V/+3.0V/+3.3V systems only and features factory-trimmed threshold, no external components required, and operation down to VCC = +1V - enabling robust reset generation even during deep brownout conditions without latch-up or undefined behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.31V ±2.5% - ensures reliable reset initiation at precise supply voltage level across full -40°C to +105°C range |
| Reset Timeout Period | 100ms (min) - guarantees sufficient processor initialization time after power recovery |
| Supply Current | 4μA (typ) at +3.6V - enables multi-year battery life in portable equipment |
| Operating Voltage Range | +1.0V to +5.5V - allows valid RESET output down to near-dead-battery conditions |
| Manual Reset Detect | 1.5μs minimum low pulse - rejects mechanical switch bounce while enabling fast user-initiated reset |
| Output Type | Open-drain active-low with internal 5.5kΩ pullup - simplifies interface to bidirectional μP reset pins without external resistor |
| Package | SC70-3 - 1.25mm × 2.1mm footprint for space-constrained PCB layouts |
Pinout & Package
MXD1818XR23+T is housed in a 3-pin SC70 package (outline X3-2, land pattern 90-0208), measuring 1.25mm × 2.1mm × 0.95mm, with lead(Pb)-free finish per RoHS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RESET) | Open-drain active-low reset output | Drives low during reset; pulled high internally via 5.5kΩ resistor to VCC; compatible with bidirectional μP reset inputs |
| 2 (VCC) | Power supply and reset threshold reference input | Monitors system supply directly; device operates correctly down to +1.0V, ensuring reset validity during deep brownout |
| 3 (GND) | Ground reference | Common return path for reset comparator and output stage; must be low-impedance for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Debounced manual-reset input | 1.5μs minimum low pulse detection eliminates need for external RC debounce circuitry with mechanical switches |
| Precision reset threshold | 2.31V ±2.5% over -40°C to +105°C ensures consistent reset point across industrial temperature range |
| No external components required | Integrated comparator, timer, pullup resistor, and debouncer eliminate BOM cost and board area for discrete reset solutions |
| Low supply current | 4μA typical consumption extends battery life in portable instrumentation and handheld devices |
| VCC transient immunity | Rejects negative-going VCC glitches up to 100μs duration (at 200mV overdrive), preventing spurious resets |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered ECG or glucose meter operating on single-cell Li-ion with wide VCC swing during discharge. IC Role / Device Role / Timing Role: Supervisory reset circuit monitoring VCC and providing clean, glitch-immune reset pulse on power-up and brownout. Use Value: Ensures deterministic μC boot sequence even as battery drops from 4.2V to 2.5V; 2.31V threshold aligns precisely with safe minimum operating voltage of 3.3V logic. | Use Scenario: DIN-rail mounted PLC module powered by 24V DC-to-3.3V SMPS, subject to line transients and hot-swap events. IC Role / Device Role / Timing Role: System-level reset supervisor asserting active-low RESET to ARM Cortex-M7 core during undervoltage and manual service reset. Use Value: 100ms timeout prevents premature firmware execution; debounced manual reset allows field technicians to initiate safe restart without external hardware. |
| Smart Energy Meters | Wireless Sensor Nodes |
Use Scenario: ANSI C12.22-compliant electricity meter with dual-supply (mains + backup capacitor) and strict reset timing requirements. IC Role / Device Role / Timing Role: Primary reset generator tied to 3.3V rail, guaranteeing >100ms reset hold-off after capacitor discharge completes. Use Value: Factory-trimmed 2.31V threshold ensures compliance with IEC 62056 brownout detection thresholds; SC70 package saves space in sealed meter housing. | Use Scenario: LoRaWAN node powered by coin cell, waking periodically to sample sensors and transmit data. IC Role / Device Role / Timing Role: Ultra-low-power reset supervisor enabling reliable wake-from-deep-sleep and cold-start sequences. Use Value: 4μA supply current minimizes quiescent drain; valid RESET down to VCC = +1V ensures reset assertion even when backup capacitor discharges to endpoint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3+T | 2.93V fixed reset threshold; no manual reset detect; SOT23-3 only | Suitable for +3.3V systems needing higher threshold; lacks pushbutton support | Select when 2.93V threshold matches system margin and manual reset is handled externally |
| TPS3808G125DBVR | 1.25V adjustable threshold via external resistor; 200ms timeout; 1.5μA IQ | Requires external resistor network; better for custom threshold needs but adds BOM complexity | Choose when precise non-standard threshold (e.g., 2.35V) is required and layout space permits two resistors |
Compared with MAX809TRD3+T and TPS3808G125DBVR, MXD1818XR23+T offers factory-accurate 2.31V threshold with integrated manual reset debounce in SC70 - delivering lower system cost, smaller footprint, and faster design-in for portable +3.3V applications where 2.31V brownout detection is specified.
Availability
MXD1818XR23+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, smart energy meters, and wireless sensor nodes requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MXD1818XR23+T 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, mixed-signal, and power management ICs for industrial, communications, computing, and consumer applications.
The MXD1815–MXD1818 product line delivers ultra-low-power, factory-trimmed reset supervisors optimized for battery-powered and space-constrained +2.5V/+3.0V/+3.3V microcontroller systems demanding high accuracy and reliability.
FAQ
What is the exact reset threshold voltage of MXD1818XR23+T and how accurate is it over temperature?
The MXD1818XR23+T 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 specification is guaranteed by design and verified across temperature extremes, ensuring consistent brownout detection in industrial and automotive-adjacent environments without calibration.
Does MXD1818XR23+T support manual reset, and what is the minimum pulse width required?
Yes, MXD1818XR23+T supports debounced manual reset via its RESET pin. A logic-low pulse of at least 1.5μs on the RESET pin triggers a full 100ms reset timeout period. This built-in debounce eliminates external RC networks and reliably rejects mechanical switch bounce while enabling fast user-initiated reset.
What package type and footprint does MXD1818XR23+T use, and is it RoHS-compliant?
MXD1818XR23+T uses the 3-pin SC70 package (outline X3-2, land pattern 90-0208), measuring 1.25mm × 2.1mm. It is supplied in lead(Pb)-free packaging, indicated by the "+T" suffix, and fully complies with RoHS Directive 2011/65/EU.
Can MXD1818XR23+T operate and assert valid RESET when VCC drops below 2.0V?
Yes, MXD1818XR23+T guarantees valid RESET output down to VCC = +1.0V. Its internal circuitry remains functional and asserts correct logic state even during deep brownout, making it suitable for battery-powered systems where supply voltage decays well below nominal levels before shutdown.
How does the internal pullup resistor in MXD1818XR23+T affect interfacing with microcontrollers?
The MXD1818XR23+T includes a 5.5kΩ internal pullup resistor on its open-drain RESET pin, eliminating the need for an external pullup. This simplifies connection to bidirectional μP reset pins (e.g., ARM Cortex-M series) and reduces BOM count, while maintaining compatibility with standard 3.3V logic levels and sink currents up to 10mA.
MXD1818XR23+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MXD1818XR23+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1818XR23+T 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+T reliable?
The price and inventory of MXD1818XR23+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1818XR23+T is usually 5 days.
3.What payment methods are accepted for MXD1818XR23+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1818XR23+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1818XR23+T?
MXD1818XR23+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1818XR23+T 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+T?
For technical support, including MXD1818XR23+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1818XR23+T requirements.
6.How does Aetrix verify that MXD1818XR23+T is sourced from the original manufacturer or authorized distributors?
All MXD1818XR23+T 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+T meets industry standards.
7.What is the process for return or replacement of MXD1818XR23+T?
All MXD1818XR23+T units undergo pre-shipment inspection (PSI). If there is an issue with MXD1818XR23+T, 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+T part is unused and in its original packaging.
Return procedure for MXD1818XR23+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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