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Analog Devices Inc./Maxim Integrated MXD1816XR22+T
- Part No.:
- MXD1816XR22+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MXD1816XR22+T.pdf
- Description:
- IC MPU RESET CIRC 2.18V SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:35,000
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Product details
Overview
MXD1816XR22+T from Maxim Integrated is a low-power, open-drain, active-low microprocessor reset supervisor IC designed for +2.5V/+3.0V/+3.3V digital systems. It monitors VCC and asserts RESET when voltage falls below 2.18V (±2.5% accuracy), maintains reset for ≥100ms after VCC recovery, features an internal 5.5kΩ pullup resistor, and operates across –40°C to +105°C in SC70-3 packaging - ideal for portable battery-powered controllers.
For engineers reviewing the MXD1816XR22+T datasheet, MXD1816XR22+T pinout, MXD1816XR22+T application, or MXD1816XR22+T equivalent, key selection criteria include its 2.18V factory-trimmed reset threshold, open-drain output compatibility with bidirectional μP reset pins, 4μA supply current at +3.6V, guaranteed RESET validity down to VCC = +1V, and immunity to fast VCC transients.
Technical Context
This device implements a precision bandgap-based reset comparator with hysteresis and an internal 100ms timeout timer. Its open-drain RESET output interfaces directly with microcontrollers like the Motorola 68HC11 without external pullups, and it ignores negative-going VCC transients shorter than ~10µs when overdriven by 20mV - ensuring robust operation during power rail noise.
The MXD1816XR22+T belongs to the MXD1815–MXD1818 subfamily optimized for 2.5V/3.0V/3.3V systems and shares pinout and functional behavior with MXD1811/MXD1816 variants. It lacks manual-reset debouncing (exclusive to MXD1813/MXD1818) and push-pull output (exclusive to MXD1812/MXD1817).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.18V ±2.5% - ensures reliable brownout detection for 2.5V/3.3V systems without external calibration |
| Reset Timeout Period | 100ms minimum - guarantees sufficient hold time for μP initialization after power recovery |
| Supply Current | 4µA typical 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 down to 1V |
| Output Type | Open-drain, active-low - allows wired-OR configuration and direct interface with bidirectional μP reset pins |
| Internal Pullup Resistor | 5.5kΩ - eliminates need for external pullup while maintaining logic-high state when RESET is inactive |
| Temperature Range | –40°C to +105°C - qualified for industrial and automotive under-hood environments |
Pinout & Package
MXD1816XR22+T is housed in a 3-pin SC70 package (outline X3-2, land pattern 90-0208), measuring 2.0mm × 1.25mm × 0.95mm, with gull-wing leads and RoHS-compliant lead-free finish (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RESET) | Open-drain active-low reset output | Drives low during reset; floats high via internal 5.5kΩ pullup - compatible with shared reset buses |
| 2 (VCC) | Power supply and reset threshold reference input | Monitors system VCC directly; enables reset assertion when supply drops below 2.18V |
| 3 (GND) | Ground reference | Provides return path for internal comparator and output stage; must be low-impedance for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.18V reset threshold | Factory-trimmed ±2.5% over temperature - eliminates external resistor networks and calibration effort |
| No external components required | Integrates comparator, timer, and pullup - reduces BOM count and PCB area in space-constrained designs |
| 4µA supply current | Enables always-on monitoring in battery-backed systems without measurable drain impact |
| VCC transient immunity | Rejects <10µs glitches at 20mV overdrive - prevents spurious resets during switching noise or ESD events |
| SC70-3 footprint | 2.0mm × 1.25mm package - fits high-density layouts where SOT23 is too large |
Applications
| Industrial Controllers | Portable Medical Devices |
|---|---|
Use Scenario: Monitoring 3.3V power rails in programmable logic controllers exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET to halt CPU execution until stable 3.3V is confirmed. Use Value: Prevents firmware corruption during brownout by holding reset ≥100ms after VCC recovers above 2.18V. | Use Scenario: Power sequencing in handheld glucose meters powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Reset generator ensuring microcontroller remains held in reset until battery voltage exceeds 2.18V post-power-up. Use Value: Guarantees valid RESET signal down to VCC = +1V - critical for safe boot at end-of-battery-life voltages. |
| Smart Energy Meters | IoT Edge Sensors |
Use Scenario: Voltage supervision of 2.5V analog front-end and 3.3V MCU in utility-grade electricity meters. IC Role / Device Role / Timing Role: Dual-rail monitor using single IC to supervise primary supply, interfacing via open-drain to shared reset bus. Use Value: Internal 5.5kΩ pullup enables direct connection to bidirectional μP reset pins - no external components needed. | Use Scenario: Low-power wake-up and reset coordination in battery-operated environmental sensor nodes. IC Role / Device Role / Timing Role: Always-on reset supervisor drawing only 4µA - extends shelf life and operational runtime. Use Value: SC70-3 package minimizes footprint on compact 2-layer PCBs while maintaining full industrial temp range support. |
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 | 3.08V reset threshold, SOT23-3 package, 1.6µA ICC | Higher threshold unsuitable for 2.5V systems; lower quiescent current | Select when 3.08V trip point matches system VCC tolerance and SOT23 layout is preferred |
| TPS3808G125DBVR | 1.25V threshold, adjustable delay, 1.1µA ICC, 6-pin SOT23 | Adjustable timeout and lower threshold - requires external capacitor and larger footprint | Select when design requires programmable reset duration or sub-2V monitoring capability |
Compared with MXD1816XR22+T, MAX809TRD3+T offers lower power but mismatches the 2.18V requirement for 2.5V systems, while TPS3808G125DBVR adds flexibility at the cost of complexity and board area - MXD1816XR22+T delivers optimal balance of precision, size, and integration for fixed-threshold 2.5V/3.3V supervision.
Availability
MXD1816XR22+T is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, smart energy meters, and IoT edge sensors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MXD1816XR22+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MXD1815–MXD1818 product line was engineered specifically for low-power, precision voltage supervision in portable and battery-operated 2.5V/3.0V/3.3V systems - emphasizing minimal footprint, ultra-low ICC, and guaranteed operation down to 1V VCC.
FAQ
What is the exact reset threshold voltage of MXD1816XR22+T and how tightly is it specified?
The MXD1816XR22+T has a factory-set reset threshold of 2.18V, with guaranteed accuracy of ±2.5% over the full operating temperature range of –40°C to +105°C. This specification is validated per the Electrical Characteristics table in the official Maxim datasheet, and the "R22" suffix explicitly denotes this 2.18V threshold variant within the MXD1815–MXD1818 family.
Does MXD1816XR22+T support manual reset functionality via an external pushbutton?
No, MXD1816XR22+T does not include manual reset detection or debouncing circuitry. That feature is exclusive to the MXD1813 and MXD1818 variants. The MXD1816XR22+T provides only power-supply monitoring and automatic reset assertion - external pushbutton reset would require additional discrete logic or a different part such as MXD1818XR22+T.
What package type and dimensions does MXD1816XR22+T use, and is it RoHS-compliant?
MXD1816XR22+T uses the 3-pin SC70 package (outline X3-2), measuring 2.0mm × 1.25mm × 0.95mm. The "+T" suffix confirms lead-free, RoHS-compliant construction. Land pattern 90-0208 is recommended, and the device is supplied in tape-and-reel format with 2500 units per reel - consistent with Maxim's standard packaging for this family.
Can MXD1816XR22+T drive a microcontroller reset pin that requires a push-pull output?
No - MXD1816XR22+T features an open-drain, active-low RESET output with an internal 5.5kΩ pullup resistor. It cannot source current like a push-pull driver. For push-pull applications, select MXD1815XR22+T (active-low) or MXD1817XR22+T (active-high). MXD1816XR22+T is intended for wired-OR buses or bidirectional μP reset pins where open-drain behavior is required.
What is the minimum supply voltage at which MXD1816XR22+T guarantees valid RESET output logic states?
MXD1816XR22+T guarantees correct RESET logic state (high-impedance when inactive, low when asserted) down to VCC = +1.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Below +1.0V, output behavior is not guaranteed - this ensures reliable reset hold during deep brownout conditions common in battery-powered systems approaching end-of-life.
MXD1816XR22+T 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:
- 2.18V
- 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
MXD1816XR22+T FAQ
1.How can I place an order for MXD1816XR22+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1816XR22+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 MXD1816XR22+T reliable?
The price and inventory of MXD1816XR22+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1816XR22+T is usually 5 days.
3.What payment methods are accepted for MXD1816XR22+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1816XR22+T transactions.
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4.How is shipping managed for MXD1816XR22+T?
MXD1816XR22+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1816XR22+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 MXD1816XR22+T?
For technical support, including MXD1816XR22+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1816XR22+T requirements.
6.How does Aetrix verify that MXD1816XR22+T is sourced from the original manufacturer or authorized distributors?
All MXD1816XR22+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 MXD1816XR22+T meets industry standards.
7.What is the process for return or replacement of MXD1816XR22+T?
All MXD1816XR22+T units undergo pre-shipment inspection (PSI). If there is an issue with MXD1816XR22+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 MXD1816XR22+T part is unused and in its original packaging.
Return procedure for MXD1816XR22+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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