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Analog Devices Inc./Maxim Integrated MXD1815XR31
- Part No.:
- MXD1815XR31
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MXD1815XR31.pdf
- Description:
- IC SUPERVISOR MICROPROCES RESET
- Quantity:
- Payment:
- Shipping:
Inventory:4,046
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Product details
Overview
MXD1815XR31 from Maxim Integrated is a low-power microprocessor reset supervisor IC designed to monitor +2.5V/+3.0V/+3.3V power supplies and assert an active-low push-pull RESET signal when VCC drops below 3.06V. It guarantees correct logic state down to VCC = +1V, features ±2.5% reset threshold accuracy over temperature, and provides a fixed 100ms minimum reset timeout period. It is used in portable battery-powered equipment requiring reliable power-on reset and brownout protection.
For engineers reviewing the MXD1815XR31 datasheet, MXD1815XR31 pinout, MXD1815XR31 application, or MXD1815XR31 equivalent, key selection criteria include its 3.06V factory-set reset threshold, SC70-3 package, 4μA supply current, push-pull active-low output, and guaranteed operation from -40°C to +105°C - all critical for embedded μP supervisory design in space-constrained industrial and portable systems.
Technical Context
The MXD1815XR31 implements a precision bandgap-based voltage comparator with hysteresis to detect VCC falling below its 3.06V threshold, triggering a monostable timer that holds RESET low for ≥100ms after VCC recovers. Its BiCMOS process enables stable operation across -40°C to +105°C while maintaining 4μA typical supply current at 3.6V.
This device belongs to the MXD1815–MXD1818 subfamily optimized for 2.5V/3.0V/3.3V systems and features no external components required, internal transient immunity against fast VCC glitches, and guaranteed RESET validity down to VCC = +1V - distinguishing it from open-drain variants and manual-reset versions like MXD1818XR31.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.06V (factory-trimmed, ±2.5% over -40°C to +105°C) - ensures reliable detection of 3.3V supply brownout before μP malfunction. |
| Reset Timeout Period | 100ms minimum - guarantees sufficient hold time for μP initialization during power-up or recovery. |
| Supply Current | 4μA typical at 3.6V - enables multi-year battery life in portable instrumentation and IoT edge nodes. |
| Operating Voltage Range | 1.0V to 5.5V - supports valid RESET assertion even during deep brownout down to 1V, preventing undefined μP states. |
| Output Type | Active-low push-pull - drives RESET directly without external pullup, simplifying interface with standard μP reset inputs. |
| Package | 3-pin SC70 (X3-2 outline) - 2.0mm × 1.25mm footprint ideal for compact PCB layouts in handheld devices. |
| Temperature Range | -40°C to +105°C - qualified for industrial and extended-temperature embedded applications. |
Pinout & Package
MXD1815XR31 is housed in a 3-pin SC70 package (outline X3-2), with pin 1 as RESET (active-low push-pull output), pin 2 as VCC (supply input and threshold monitor), and pin 3 as GND. The package is RoHS-compliant, surface-mount, and optimized for reflow soldering in high-volume production.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull output; drives low during reset condition and high otherwise - eliminates need for external pullup resistor. |
| 2 | VCC | Primary supply input and reset threshold reference point - internally monitored by precision comparator. |
| 3 | GND | Ground reference for both supply and reset comparator - must be low-impedance connection for accurate threshold detection. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 3.06V reset threshold | Factory-trimmed ±2.5% over full temperature range - ensures consistent brownout detection across operating environments. |
| No external components required | Integrated comparator, timer, and push-pull driver - reduces BOM count and PCB area in cost-sensitive designs. |
| 100ms fixed reset timeout | Monostable timing circuit guarantees minimum reset pulse width - meets μP reset specification requirements without external RC network. |
| 4μA ultra-low supply current | BiCMOS process enables micropower operation - extends battery life in always-on portable monitoring systems. |
| VCC = +1V RESET validity | Guaranteed logic-state integrity down to 1V supply - prevents spurious release of reset during deep undervoltage conditions. |
Applications
| Industrial Controllers | Portable Medical Devices |
|---|---|
Use Scenario: Monitoring 3.3V power rails in programmable logic controllers during factory automation line power fluctuations. IC Role / Device Role / Timing Role: Supervisory reset generator ensuring deterministic μP restart after brownout events. Use Value: Prevents firmware corruption and system lockup by enforcing 100ms minimum reset hold time during unstable mains conditions. | Use Scenario: Power sequencing and reset management in handheld ECG monitors powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Low-power reset supervisor asserting active-low signal when battery voltage sags below 3.06V. Use Value: Enables safe shutdown and recovery before analog front-end or ADC operation degrades, preserving measurement integrity. |
| Network Edge Routers | Smart Energy Meters |
Use Scenario: Ensuring clean boot of ARM-based SoC in compact broadband gateways exposed to intermittent AC power. IC Role / Device Role / Timing Role: Precision voltage monitor with push-pull output driving SoC reset pin directly. Use Value: Eliminates external pullup and reduces layout complexity while guaranteeing reset assertion down to 1V VCC during brownout recovery. | Use Scenario: Supervising 3.3V supply in ANSI C12.22-compliant electricity meters operating in outdoor utility cabinets. IC Role / Device Role / Timing Role: Temperature-stable reset circuit maintaining ±2.5% threshold accuracy from -40°C to +105°C. Use Value: Avoids false resets due to thermal drift, ensuring continuous metrology logging and secure firmware updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD33+T | 3.08V reset threshold, SOT23-3 package, 1.6μA typical ICC, but only specified from -40°C to +85°C. | Lacks extended temperature qualification and has tighter 3.08V threshold - less margin for 3.3V rail tolerance. | Select when lower quiescent current is prioritized and ambient temperature stays ≤+85°C. |
| TPS3808G33DBVR | 3.08V threshold, 1.8μA ICC, adjustable delay option, but requires external capacitor for timeout and uses SOT23-6. | Higher pin count and external component dependency increase BOM and layout overhead. | Choose only if programmable timeout or enhanced watchdog features are required beyond basic reset supervision. |
Compared with MAX809TRD33+T and TPS3808G33DBVR, MXD1815XR31 delivers superior temperature range coverage (+105°C), tighter integration (no external components), and optimal 3.06V threshold alignment with 3.3V supply nominal tolerance - making it the preferred choice for ruggedized portable and industrial μP reset applications.
Availability
MXD1815XR31 is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, network edge routers, and smart energy meters requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MXD1815XR31 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 designed specifically for low-power, space-constrained microprocessor reset supervision in 2.5V/3.0V/3.3V systems - emphasizing precision threshold accuracy, ultra-low ICC, and extended temperature reliability.
FAQ
What is the exact reset threshold voltage of the MXD1815XR31 and how is it trimmed?
The MXD1815XR31 has a factory-set reset threshold of 3.06V, with ±2.5% accuracy guaranteed over the full -40°C to +105°C temperature range. This value is achieved through laser trimming during wafer test, and the "R31" suffix in the part number explicitly denotes this 3.06V threshold variant per Maxim's Reset Threshold Table.
Does the MXD1815XR31 support manual reset functionality via the RESET pin?
No, the MXD1815XR31 does not include manual reset detection. That feature is exclusive to the MXD1813 and MXD1818 variants (e.g., MXD1818XR31), which require a >1.5μs low pulse on RESET to trigger debounced manual reset. MXD1815XR31 provides only power-supply monitoring and automatic reset assertion.
What is the maximum supply voltage the MXD1815XR31 can withstand, and what happens below 1V?
The MXD1815XR31 operates from 1.0V to 5.5V, with absolute maximum VCC rated at +6.0V. Below 1.0V, the device ceases functional operation, but its RESET output remains predictably low (for push-pull configuration) down to VCC = +1V - a key guarantee enabling safe μP shutdown sequencing in deep brownout scenarios.
Is the MXD1815XR31 pin-compatible with other devices in the MXD181x family?
Yes, all MXD181x devices - including MXD1815XR31 - share identical 3-pin SC70 and SOT23 footprints and pinouts (RESET/VCC/GND). However, output type (push-pull vs. open-drain), reset polarity, and manual reset capability differ across variants, so electrical compatibility must be verified per application requirements.
How does the MXD1815XR31 handle power supply transients, and what is its immunity level?
The MXD1815XR31 is designed to ignore fast negative-going VCC transients (glitches) due to internal comparator hysteresis and filtering. Its Typical Operating Characteristics graph "Maximum Transient Duration vs. Reset Threshold Overdrive" shows it tolerates sub-microsecond glitches up to ~20mV overdrive without false triggering - a key reliability feature for noisy industrial power rails.
MXD1815XR31 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:
- 3.06V
- 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
MXD1815XR31 FAQ
1.How can I place an order for MXD1815XR31 through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1815XR31 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 MXD1815XR31 reliable?
The price and inventory of MXD1815XR31 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1815XR31 is usually 5 days.
3.What payment methods are accepted for MXD1815XR31?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1815XR31 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1815XR31?
MXD1815XR31 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1815XR31 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 MXD1815XR31?
For technical support, including MXD1815XR31 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1815XR31 requirements.
6.How does Aetrix verify that MXD1815XR31 is sourced from the original manufacturer or authorized distributors?
All MXD1815XR31 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 MXD1815XR31 meets industry standards.
7.What is the process for return or replacement of MXD1815XR31?
All MXD1815XR31 units undergo pre-shipment inspection (PSI). If there is an issue with MXD1815XR31, 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 MXD1815XR31 part is unused and in its original packaging.
Return procedure for MXD1815XR31:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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MIC826SYMT-TR
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