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Analog Devices Inc./Maxim Integrated MXD1818XR29-T
- Part No.:
- MXD1818XR29-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MXD1818XR29-T.pdf
- Description:
- IC SUPERVISOR MICROPROCES RESET
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
MXD1818XR29-T from Maxim Integrated is a low-power microprocessor reset supervisor IC in SC70-3 package, featuring open-drain active-low RESET output with debounced manual-reset capability, 2.88V ±2.5% factory-set reset threshold, and 100ms minimum reset timeout period. It monitors +2.5V/+3.0V/+3.3V power supplies in portable battery-powered systems and embedded controllers to prevent code-execution errors during brownout or power-up.
For engineers reviewing the MXD1818XR29-T datasheet, MXD1818XR29-T pinout, MXD1818XR29-T application, or MXD1818XR29-T equivalent, key selection criteria include reset threshold accuracy over temperature, manual-reset debounce timing (1.5μs min detect), guaranteed RESET validity down to VCC = +1V, internal 5.5kΩ pullup resistor, and immunity to fast VCC transients.
Technical Context
The MXD1818XR29-T implements a precision voltage comparator with hysteresis-free threshold detection at 2.88V, coupled to a monostable timer that asserts RESET for ≥100ms after VCC rises above threshold or after external manual reset release. Its internal debouncing circuitry filters mechanical switch bounce by requiring ≥1.5μs low pulse on RESET pin before initiating tPBRST timeout.
Designed for +2.5V–+3.3V systems, it guarantees correct logic state down to VCC = +1V and rejects transients ≤20μs at 100mV overdrive (VTH − VCC), leveraging BiCMOS process for low 4μA typical supply current and stable operation across −40°C to +105°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.88V ±2.5% - factory-trimmed for precise brownout detection in 2.5V/3.0V/3.3V rails |
| Reset Timeout Period | 100ms (min) - ensures μP initialization completes before release, independent of VCC ramp rate |
| Supply Current | 4μA typ at +3.6V - enables multi-year battery life in portable instrumentation |
| Operating Voltage Range | +1.0V to +5.5V - supports valid RESET assertion even during deep brownout recovery |
| Manual Reset Detect | 1.5μs min low pulse - eliminates false triggers from switch contact bounce |
| Output Type | Open-drain active-low with 5.5kΩ internal pullup - interfaces directly with bidirectional μP reset pins without external components |
| Transient Immunity | Rejects ≤20μs negative VCC glitches at 100mV overdrive - prevents spurious resets in noisy environments |
Pinout & Package
MXD1818XR29-T is housed in a 3-pin SC70 package (outline X3-2), measuring 2.0mm × 2.1mm × 0.95mm, suitable for high-density portable PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SC70) | RESET | Open-drain active-low output with internal 5.5kΩ pullup to VCC; sinks ≥10mA when asserted; requires no external pullup |
| 2 (SC70) | VCC | Power supply input and reset threshold monitor reference; accepts +1.0V to +5.5V; powers internal comparator and timer |
| 3 (SC70) | GND | Analog ground reference for comparator and reset generator; must be connected to system ground plane for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Debounced Manual Reset | Guarantees reliable push-button initiation with 1.5μs minimum low pulse detection and 100ms timeout - eliminates need for external RC debounce networks |
| Precision Threshold Accuracy | ±2.5% over −40°C to +105°C - ensures consistent brownout response across industrial temperature range without calibration |
| No External Components Required | Integrates voltage reference, comparator, timer, and pullup resistor - reduces BOM count and board area vs discrete solutions |
| Low-Power Operation | 4μA typical ICC at +3.6V - extends battery runtime in handheld medical devices and IoT sensors |
| VCC Transient Immunity | Immune to fast negative-going supply glitches ≤20μs duration - maintains system stability in electrically noisy environments |
Applications
| Computers and Controllers | Portable/Battery-Powered Equipment |
|---|---|
Use Scenario: Embedded controller in industrial PLC monitoring 3.3V I/O rail during mains fluctuation. IC Role / Device Role / Timing Role: Supervisory IC asserting active-low RESET to halt CPU execution until VCC stabilizes above 2.88V and remains valid for ≥100ms. Use Value: Prevents corrupted firmware writes and state-machine lockup during brownout recovery without external timing components. | Use Scenario: Handheld test instrument powered by single Li-ion cell (2.7V–4.2V range). IC Role / Device Role / Timing Role: Reset supervisor ensuring μC boots only when battery voltage exceeds 2.88V and sustains reset hold time post-power-up. Use Value: Eliminates premature boot failures and extends usable battery capacity by enabling operation down to 2.88V threshold with 4μA quiescent current. |
| Intelligent Instruments | Set-Top Boxes |
Use Scenario: Digital multimeter with real-time data logging and EEPROM storage. IC Role / Device Role / Timing Role: Active-low open-drain RESET output tied to μC's bidirectional reset pin, using internal 5.5kΩ pullup to avoid external resistor. Use Value: Ensures EEPROM write cycles complete before power loss and guarantees clean restart after manual reset via front-panel button. | Use Scenario: Consumer STB with HDMI interface and conditional access module requiring deterministic boot sequence. IC Role / Device Role / Timing Role: Brownout detector holding RESET asserted during AC line sag, with debounced manual reset for field service recovery. Use Value: Meets CE/UL safety requirements for controlled shutdown and avoids video artifacts caused by partial μP initialization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD29+T | Same 2.88V threshold, SOT23-3, but lacks manual-reset debounce; 14μA max ICC vs 16μA typ for MXD1818XR29-T | No built-in pushbutton detection - requires external RC network for manual reset | Select when manual reset is not required and SOT23 footprint is preferred over SC70 |
| TPS3808G33DBVR | 2.93V threshold (±0.5%), 1.5μA max ICC, adjustable delay via capacitor; no internal pullup - open-drain only with external pullup needed | Delay programmability adds flexibility but increases component count and layout complexity | Select when fine-tuned timeout or ultra-low power (<2μA) is critical, and design can accommodate external capacitor |
Compared with MAX809TRD29+T and TPS3808G33DBVR, the MXD1818XR29-T uniquely integrates debounced manual reset and internal pullup in SC70-3, delivering lowest component count and smallest footprint for space-constrained 2.88V-supervised systems requiring pushbutton recovery.
Availability
MXD1818XR29-T is available at Aetrix Electronics and suitable for portable instrumentation, industrial controllers, intelligent meters, and set-top boxes requiring stable component supply with full industrial temperature support and RoHS-compliant packaging.
Supply support for MXD1818XR29-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 and mixed-signal ICs for power management, sensing, and interface applications in industrial, automotive, and communications markets.
The MXD1810–MXD1818 family was developed to deliver ultra-low-power, pin-compatible reset supervision for battery-operated and space-constrained embedded systems, with factory-set thresholds eliminating calibration overhead.
FAQ
What is the exact reset threshold voltage of the MXD1818XR29-T?
The MXD1818XR29-T has a factory-set reset threshold of 2.88V with ±2.5% accuracy over the full −40°C to +105°C temperature range. This value is confirmed in the Electrical Characteristics table under "MXD181_ _ R29" row, where VTH min/typ/max are specified as 2.80V/2.88V/2.97V. The "R29" suffix in the part number explicitly denotes this 2.88V threshold variant.
Does the MXD1818XR29-T require an external pullup resistor on the RESET pin?
No, the MXD1818XR29-T does not require an external pullup resistor. It features an internal 5.5kΩ pullup resistor connected to VCC on its open-drain RESET output, as documented in the Electrical Characteristics table (RP = 3.1kΩ to 7.5kΩ) and Pin Descriptions section. This allows direct connection to bidirectional μP reset pins without additional components.
How does the manual reset function work on the MXD1818XR29-T?
The MXD1818XR29-T detects manual reset by monitoring the RESET pin for a logic-low signal lasting ≥1.5μs. Upon detection, it asserts RESET for a minimum of 100ms (tPBRST), then releases it. This internal debounce eliminates switch bounce without external circuitry. The feature is exclusive to MXD1813/MXD1818 variants, confirmed in the General Description and Detailed Description sections.
What is the supply current consumption of the MXD1818XR29-T at 3.3V?
At VCC = +3.6V and VCC > VTH with no load, the MXD1818XR29-T draws 4μA typical and 10μA maximum supply current (ICC), as specified in the Electrical Characteristics table. At +3.3V, this remains representative since the datasheet lists +3.6V as the test condition for low-voltage operation; actual consumption at +3.3V is within the same 4–10μA range.
Is the MXD1818XR29-T compatible with 2.5V, 3.0V, and 3.3V power supply systems?
Yes, the MXD1818XR29-T is explicitly designed for +2.5V, +3.0V, and +3.3V systems, as stated in the General Description and Selector Guide. Its 2.88V reset threshold falls within the valid operating window for all three rails, and it guarantees correct logic state down to VCC = +1V, ensuring robust performance across these supply voltages.
MXD1818XR29-T 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:
- 2.88V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MXD1818XR29-T FAQ
1.How can I place an order for MXD1818XR29-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1818XR29-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 MXD1818XR29-T reliable?
The price and inventory of MXD1818XR29-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1818XR29-T is usually 5 days.
3.What payment methods are accepted for MXD1818XR29-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1818XR29-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1818XR29-T?
MXD1818XR29-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1818XR29-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 MXD1818XR29-T?
For technical support, including MXD1818XR29-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1818XR29-T requirements.
6.How does Aetrix verify that MXD1818XR29-T is sourced from the original manufacturer or authorized distributors?
All MXD1818XR29-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 MXD1818XR29-T meets industry standards.
7.What is the process for return or replacement of MXD1818XR29-T?
All MXD1818XR29-T units undergo pre-shipment inspection (PSI). If there is an issue with MXD1818XR29-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 MXD1818XR29-T part is unused and in its original packaging.
Return procedure for MXD1818XR29-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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