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Analog Devices Inc./Maxim Integrated MXD1818XR22-T
- Part No.:
- MXD1818XR22-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MXD1818XR22-T.pdf
- Description:
- IC SUPERVISOR MICROPROCES RESET
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MXD1818XR22-T from Maxim Integrated is an open-drain, active-low microprocessor reset supervisor IC with manual-reset debouncing capability, designed for +2.5V/+3.0V/+3.3V systems. It asserts reset when VCC drops below 2.18V (±2.5% over temperature), maintains reset for ≥100ms after VCC recovery, and detects external push-button resets held >1.5μs - used in portable battery-powered controllers and embedded μP monitoring.
For engineers reviewing the MXD1818XR22-T datasheet, MXD1818XR22-T pinout, MXD1818XR22-T application, or MXD1818XR22-T equivalent, key selection criteria include its 2.18V factory-trimmed threshold, SC70-3 package, 4μA supply current, debounced manual-reset input, and guaranteed RESET validity down to VCC = +1V.
Technical Context
The MXD1818XR22-T implements a precision voltage comparator with hysteresis-free threshold detection at 2.18V, coupled to a monostable timer that enforces a minimum 100ms reset timeout on both power-up and manual-reset events. Its internal 5.5kΩ pullup resistor enables direct interface with bidirectional μP reset pins without external components.
It features transient immunity against negative-going VCC glitches up to 100μs at 200mV overdrive, operates across -40°C to +105°C, and guarantees functional reset assertion even as VCC declines to +1V - critical for brownout resilience in low-power embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.18V ±2.5% over -40°C to +105°C - ensures reliable brownout detection for 2.5V/3.0V/3.3V rails |
| Reset Timeout Period | 100ms minimum - guarantees sufficient μP initialization time after power recovery or manual reset |
| Supply Current | 4μA typical at +3.6V - enables multi-year operation in battery-backed portable equipment |
| Manual Reset Detect | 1.5μs minimum low pulse - rejects mechanical switch bounce while enabling fast operator-initiated reset |
| Operating Voltage Range | +1.0V to +5.5V - supports valid reset output down to near-dead-battery conditions |
| Package | 3-pin SC70 - 2.0mm × 1.25mm footprint ideal for space-constrained PCB layouts |
| Output Type | Open-drain, active-low with internal 5.5kΩ pullup - eliminates need for external pullup and simplifies bidirectional μP reset interfacing |
Pinout & Package
MXD1818XR22-T is housed in a 3-pin SC70 package (outline X3-2, land pattern 90-0208), measuring 2.0mm × 1.25mm × 0.9mm, rated for -40°C to +105°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RESET) | Open-drain active-low reset output | Drives low during reset; pulled high internally to VCC via 5.5kΩ resistor - interfaces directly with μP reset pins requiring open-drain compatibility |
| 2 (VCC) | Power supply and threshold monitor input | Supplies IC and serves as reference for reset comparator - valid operation guaranteed from +1.0V to +5.5V |
| 3 (GND) | Ground reference | Common return path for internal comparator and output stage - must be low-impedance to ensure accurate threshold sensing |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 2.18V reset threshold | Eliminates external resistor networks and calibration - reduces BOM count and layout area for 2.5V/3.0V/3.3V systems |
| Debounced manual-reset input | Rejects <1.5μs noise pulses from mechanical switches - removes need for external RC filtering or firmware debounce logic |
| Internal 5.5kΩ pullup resistor | Enables direct connection to bidirectional μP reset pins (e.g., Motorola 68HC11) without external components |
| 4μA supply current | Extends battery life in portable instruments and handheld controllers - supports >10-year operation on coin-cell sources |
| VCC = +1V reset validity | Ensures deterministic reset state during deep brownout - prevents μP runaway before complete power collapse |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered ECG or glucose meter operating from single Li-ion cell with wide VCC swing (3.0V–4.2V discharge). IC Role / Device Role / Timing Role: Supervises system power rail and provides debounced manual reset for field service. Use Value: Guarantees clean μP restart during battery sag and eliminates external debounce circuitry - reducing component count by two passives. |
Use Scenario: DIN-rail mounted PLC module powered from 24VDC converted to +3.3V, subject to industrial transients. IC Role / Device Role / Timing Role: Monitors +3.3V logic rail and asserts reset on undervoltage or operator-initiated fault recovery. Use Value: 100ms timeout ensures full FPGA configuration reload; ±2.5% threshold accuracy maintains trip point across temperature extremes. |
| Smart Energy Meters | Point-of-Sale Terminals |
Use Scenario: Revenue-grade electricity meter with backup supercapacitor maintaining RTC and memory during AC outage. IC Role / Device Role / Timing Role: Resets main controller when backup rail falls below 2.18V, preventing corrupted data writes. Use Value: Valid reset output down to VCC = +1V ensures safe shutdown before supercap voltage collapses - preserving metering integrity. |
Use Scenario: Credit card terminal using +3.3V rail derived from USB-C PD source, exposed to frequent plug/unplug cycles. IC Role / Device Role / Timing Role: Provides power-on reset and hardware-initiated reset via front-panel button. Use Value: Internal pullup and debounced input eliminate need for external pullup and switch filter - saving 2.5mm² PCB area per unit. |
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 reset threshold, SOT23-3, no manual reset detect | Lacks debounced push-button support; requires external RC for manual reset | Select when only basic power-on reset is needed and board space allows external components |
| TPS3808G125DBVR | 1.25V threshold, adjustable via external resistor, 1.6μA ICC, SOT23-6 | Higher pin count, programmable threshold, no integrated manual reset debounce | Choose when threshold flexibility outweighs BOM simplicity and SC70 size constraints |
Compared with MXD1818XR22-T, MAX809TRD3-T offers higher threshold but no manual-reset integration, while TPS3808G125DBVR provides adjustability at the cost of larger footprint and added design complexity - MXD1818XR22-T delivers optimal balance of precision, compactness, and integrated functionality for fixed 2.18V + manual-reset use cases.
Availability
MXD1818XR22-T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, smart energy meters, and point-of-sale terminals requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MXD1818XR22-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 - serving industrial, medical, and communications markets.
The MXD1810–MXD1818 family was engineered specifically for low-power, space-constrained microprocessor supervision - delivering factory-trimmed voltage thresholds, integrated manual-reset debounce, and ultra-low ICC in miniature SC70/SOT23 packages.
FAQ
What is the exact reset threshold voltage of MXD1818XR22-T and how stable is it over temperature?
The MXD1818XR22-T has a factory-set reset threshold of 2.18V, with ±2.5% accuracy guaranteed over the full -40°C to +105°C operating range. This stability is achieved through laser-trimmed BiCMOS comparator design and is validated in production testing - ensuring consistent brownout response across environmental conditions without external calibration. MXD1818XR22-T maintains this specification under all load and supply conditions specified in the datasheet.
Does MXD1818XR22-T support manual reset, and how does its debounce function work?
Yes, MXD1818XR22-T includes integrated manual-reset debounce: it asserts reset only when the RESET pin is held low for ≥1.5μs, rejecting shorter noise spikes from mechanical switches. Upon release, it initiates a guaranteed 100ms reset timeout - eliminating need for external RC filters or firmware-based debouncing. This behavior is intrinsic to MXD1818XR22-T's internal logic and documented in its functional diagram and timing specifications.
What package type and dimensions does MXD1818XR22-T use, and is it RoHS-compliant?
MXD1818XR22-T uses the 3-pin SC70 package (outline X3-2), measuring 2.0mm × 1.25mm × 0.9mm with 0.65mm lead pitch. It is available in lead(Pb)-free packaging - indicated by the "-T" suffix - and complies with RoHS Directive 2011/65/EU. The land pattern (90-0208) and thermal characteristics are fully documented in Maxim's official package drawings.
Can MXD1818XR22-T operate reliably when VCC drops below 2.0V?
Yes - MXD1818XR22-T guarantees correct RESET logic state down to VCC = +1.0V, and its reset comparator remains functional throughout this range. This ensures deterministic behavior during deep brownout or battery depletion, unlike many supervisors that fail silently below 1.8V. The datasheet explicitly confirms this capability under Absolute Maximum Ratings and Electrical Characteristics sections for MXD1818XR22-T.
How does the internal pullup resistor in MXD1818XR22-T affect system design?
MXD1818XR22-T integrates a 5.5kΩ internal pullup resistor on its open-drain RESET pin, enabling direct connection to bidirectional μP reset inputs (e.g., Motorola 68HC11) without external components. This reduces BOM count, saves PCB area, and eliminates variability from discrete resistor tolerances - a verified design feature of MXD1818XR22-T confirmed in Pin Descriptions and Applications Information sections.
MXD1818XR22-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:
- 2.18V
- 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
MXD1818XR22-T FAQ
1.How can I place an order for MXD1818XR22-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1818XR22-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 MXD1818XR22-T reliable?
The price and inventory of MXD1818XR22-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1818XR22-T is usually 5 days.
3.What payment methods are accepted for MXD1818XR22-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1818XR22-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1818XR22-T?
MXD1818XR22-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1818XR22-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 MXD1818XR22-T?
For technical support, including MXD1818XR22-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1818XR22-T requirements.
6.How does Aetrix verify that MXD1818XR22-T is sourced from the original manufacturer or authorized distributors?
All MXD1818XR22-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 MXD1818XR22-T meets industry standards.
7.What is the process for return or replacement of MXD1818XR22-T?
All MXD1818XR22-T units undergo pre-shipment inspection (PSI). If there is an issue with MXD1818XR22-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 MXD1818XR22-T part is unused and in its original packaging.
Return procedure for MXD1818XR22-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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