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Analog Devices Inc./Maxim Integrated MXD1815XR22+T
- Part No.:
- MXD1815XR22+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MXD1815XR22+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,493
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Product details
Overview
MXD1815XR22+T from Maxim Integrated is a low-power microprocessor reset supervisor IC designed for +2.5V/+3.0V/+3.3V digital systems. It provides active-low, open-drain RESET output with factory-set 2.18V reset threshold, 100ms minimum reset timeout, ±2.5% threshold accuracy over temperature, and internal 5.5kΩ pullup resistor - used to ensure reliable power-on reset in portable battery-powered equipment.
For engineers reviewing the MXD1815XR22+T datasheet, MXD1815XR22+T pinout, MXD1815XR22+T application, or MXD1815XR22+T equivalent, key selection criteria include reset threshold tolerance, manual-reset debounce capability (not present in this variant), VCC operating range down to +1.0V, and compatibility with bidirectional μP reset pins without external pullups.
Technical Context
The MXD1815XR22+T implements a precision bandgap-based voltage monitor with hysteresis-free comparator architecture, ensuring stable reset assertion during VCC brownout events. Its internal timer guarantees ≥100ms reset pulse width after VCC recovery, independent of supply ramp rate.
This variant belongs to the MXD1815–MXD1818 subfamily optimized for 2.5V/3.0V/3.3V systems and features open-drain active-low RESET output with integrated pullup - enabling direct interface to microcontrollers with bidirectional reset pins (e.g., Motorola 68HC11) without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.18V (factory-trimmed, ±2.5% over -40°C to +105°C) - ensures reliable detection of 2.5V/3.3V supply droop before system instability |
| Reset Timeout Period | 100ms min - guarantees sufficient hold time for μP initialization across all operating temperatures |
| Supply Voltage Range | +1.0V to +5.5V - enables valid RESET assertion even during deep brownout down to 1V VCC |
| Supply Current | 4μA typical at +3.6V - minimizes quiescent load in battery-critical portable applications |
| Output Type | Open-drain, active-low with 5.5kΩ internal pullup - eliminates need for external pullup and supports wired-OR reset bus configurations |
| Transient Immunity | Rejects <1.5μs negative VCC glitches - prevents spurious resets from noise or switching transients |
| Operating Temperature | -40°C to +105°C - qualified for industrial and extended-temperature embedded deployments |
Pinout & Package
MXD1815XR22+T is housed in a 3-pin SC70 package (outline X3-2), footprint-compatible with SOT23 but 30% smaller - ideal for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SC70) / 2 (SOT23) | RESET | Open-drain, active-low reset output; pulled high internally to VCC via 5.5kΩ resistor - interfaces directly to bidirectional μP reset pins |
| 2 (SC70) / 1 (SOT23) | VCC | Power supply input and reset threshold reference - monitors supply voltage; functional down to +1.0V |
| 3 (both) | GND | Analog ground reference for comparator and internal circuitry - must be connected to system ground plane for accurate threshold sensing |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated voltage reference, comparator, timer, and pullup eliminate discrete BOM items and layout complexity |
| Factory-set precision threshold | 2.18V ±2.5% over full temperature range - avoids calibration overhead and improves production yield |
| Low-power operation | 4μA typical ICC - extends battery life in always-on monitoring applications such as IoT sensors |
| Bidirectional reset pin support | Open-drain output enables shared reset bus where either μP or supervisor can assert reset - simplifies multi-controller systems |
| Robust transient immunity | Immune to VCC glitches <1.5μs - prevents false resets in noisy power environments like motor-driven peripherals |
Applications
| Portable/Battery-Powered Equipment | Critical μP and μC Monitoring |
|---|---|
Use Scenario: Power management in handheld medical devices with Li-ion battery supply and ARM Cortex-M0+ MCU. IC Role / Device Role / Timing Role: Supervisory reset generator that asserts RESET until VCC stabilizes above 2.18V and holds it for ≥100ms post-recovery. Use Value: Ensures deterministic boot sequence despite battery voltage sag during cold start or load transients. | Use Scenario: Industrial PLC controller requiring fail-safe restart after AC line interruption. IC Role / Device Role / Timing Role: Brownout detector that triggers hard reset when 3.3V logic rail drops below 2.18V due to undervoltage event. Use Value: Prevents corrupted firmware execution by guaranteeing full reset before μP exits reset state. |
| Computers and Controllers | Intelligent Instruments |
Use Scenario: Embedded x86 single-board computer with dual-rail power (3.3V core, 5V I/O) and watchdog coexistence. IC Role / Device Role / Timing Role: Dedicated 3.3V supply monitor providing clean, glitch-immune reset signal to CPU's RESET# pin. Use Value: Decouples reset timing from watchdog behavior - enables independent power-fail response without race conditions. | Use Scenario: Portable oscilloscope with FPGA-based acquisition engine and analog front-end powered from regulated 2.5V rail. IC Role / Device Role / Timing Role: Precision reset supervisor ensuring FPGA configuration completes only after stable 2.5V rail is confirmed. Use Value: Eliminates configuration errors caused by marginal VCC during power-up ramp, improving field reliability. |
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 | 2.93V reset threshold, same SC70-3 package, 14μA max ICC, no internal pullup - requires external 100kΩ pullup | Suitable for 3.0V/3.3V systems needing higher threshold; not drop-in due to missing internal pullup and different timing specs | Select when 2.93V threshold better matches system margin requirements and external pullup is acceptable |
| TPS3808G12DBVR | 1.2V threshold option, SOT23-5 package, adjustable delay, 1.1μA typical ICC, push-pull output - no internal pullup, different pinout | Used in ultra-low-power sensor nodes where sub-μA quiescent current is critical; incompatible pinout and interface | Choose for energy-harvesting applications demanding <2μA supply current and programmable timeout |
Compared with MAX809TRD29+T and TPS3808G12DBVR, MXD1815XR22+T offers tighter threshold accuracy (±2.5% vs ±3.5%), integrated pullup eliminating BOM cost, and guaranteed operation down to VCC = +1.0V - making it optimal for compact, cost-sensitive 2.5V/3.3V portable systems requiring minimal external components.
Availability
MXD1815XR22+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, critical μP and μC monitoring, and intelligent instruments requiring stable component supply across industrial temperature ranges and long-lifecycle programs.
Supply support for MXD1815XR22+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 delivers low-power, precision reset supervision for 2.5V/3.0V/3.3V microprocessor systems - engineered to replace discrete reset solutions with integrated, space-saving, and production-ready alternatives.
FAQ
What is the exact reset threshold voltage of MXD1815XR22+T and how tightly is it specified?
The MXD1815XR22+T has a factory-set reset threshold of 2.18V, with guaranteed accuracy of ±2.5% over the full operating temperature range (-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 the 2.18V threshold variant. The device maintains this precision without external calibration or trimming components.
Does MXD1815XR22+T support manual reset via an external pushbutton?
No, MXD1815XR22+T does not include manual reset debounce functionality. That feature is exclusive to the MXD1813/MXD1818 variants (e.g., MXD1818XR22+T). The MXD1815XR22+T is an open-drain, active-low reset supervisor with fixed 2.18V threshold and 100ms timeout - it responds only to VCC supply voltage changes, not external RESET pin assertion.
What package type and footprint does MXD1815XR22+T use, and is it compatible with SOT23 layouts?
MXD1815XR22+T uses the 3-pin SC70 package (outline X3-2), which is physically smaller than SOT23 and not footprint-compatible. While both are 3-pin surface-mount packages, SC70 has 0.65mm lead pitch versus SOT23's 0.95mm, and different pad dimensions. The datasheet explicitly lists separate ordering codes (XR for SC70, UR for SOT23), confirming distinct land patterns - PCB layout must match SC70-3 specifications.
Can MXD1815XR22+T operate reliably when VCC drops below 2.18V but remains above 1.0V?
Yes, MXD1815XR22+T guarantees correct RESET logic state down to VCC = +1.0V, as stated in the Absolute Maximum Ratings and Electrical Characteristics sections. Below 2.18V, RESET is asserted (pulled low); above 2.18V, it releases after the 100ms timeout. The internal circuitry remains functional and predictable throughout the 1.0V–5.5V range - critical for brownout recovery in battery-powered systems.
Is an external pullup resistor required when using MXD1815XR22+T's RESET output?
No, an external pullup resistor is not required. MXD1815XR22+T integrates a 5.5kΩ internal pullup resistor on its open-drain RESET output, as confirmed in the Pin Descriptions and Electrical Characteristics tables. This allows direct connection to bidirectional μP reset pins (e.g., Motorola 68HC11) without additional components - a key design advantage over alternatives like MAX809 that require external pullups.
MXD1815XR22+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:
- 2.18V
- Output:
- Push-Pull, Totem Pole
- 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
MXD1815XR22+T FAQ
1.How can I place an order for MXD1815XR22+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1815XR22+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 MXD1815XR22+T reliable?
The price and inventory of MXD1815XR22+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1815XR22+T is usually 5 days.
3.What payment methods are accepted for MXD1815XR22+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1815XR22+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1815XR22+T?
MXD1815XR22+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1815XR22+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 MXD1815XR22+T?
For technical support, including MXD1815XR22+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1815XR22+T requirements.
6.How does Aetrix verify that MXD1815XR22+T is sourced from the original manufacturer or authorized distributors?
All MXD1815XR22+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 MXD1815XR22+T meets industry standards.
7.What is the process for return or replacement of MXD1815XR22+T?
All MXD1815XR22+T units undergo pre-shipment inspection (PSI). If there is an issue with MXD1815XR22+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 MXD1815XR22+T part is unused and in its original packaging.
Return procedure for MXD1815XR22+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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