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Analog Devices Inc./Maxim Integrated MXD1817UR22+
- Part No.:
- MXD1817UR22+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MXD1817UR22+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,046
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Product details
Overview
MXD1817UR22+ from Maxim Integrated is a precision microprocessor reset supervisor IC designed for +2.5V/+3.0V/+3.3V digital systems. It features an active-high push-pull RESET output, factory-set 2.18V reset threshold (±2.5% over temperature), 100ms minimum reset timeout, and guaranteed operation down to VCC = +1V. It is used in portable battery-powered equipment to ensure reliable power-on initialization and brownout recovery.
For engineers reviewing the MXD1817UR22+ datasheet, MXD1817UR22+ pinout, MXD1817UR22+ application, or MXD1817UR22+ equivalent, key selection criteria include reset polarity (active-high), push-pull drive capability, low 4µA supply current, manual-reset absence (distinguishing it from MXD1818), and SOT23-3 package compatibility with space-constrained embedded designs.
Technical Context
The MXD1817UR22+ integrates a precision voltage comparator with hysteresis, a temperature-stable reference, and a fixed 100ms reset timeout timer. Its active-high push-pull output drives directly into microprocessor reset inputs without external pull-up or pull-down components.
It monitors VCC continuously and asserts RESET high when VCC falls below 2.18V, holding it high for ≥100ms after VCC rises above threshold. Unlike MXD1818, it lacks manual-reset debounce circuitry and open-drain configuration - confirming its role as a dedicated active-high supervisory device for stable 2.5V–3.3V rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.18V ±2.5% over -40°C to +105°C - ensures accurate brownout detection for 2.5V/3.3V systems without calibration. |
| Reset Timeout | 100ms minimum - guarantees sufficient processor hold time during power-up and recovery. |
| Supply Current | 4µA typical at +3.6V - enables ultra-low-power operation in battery-backed or energy-sensitive applications. |
| Output Type | Active-high push-pull - eliminates need for external pull-up resistor and supports direct interface to µP reset pins requiring high-active assertion. |
| VCC Operating Range | +1.0V to +5.5V - allows valid RESET logic state even during deep brownout (down to 1V), critical for fail-safe sequencing. |
| Package | SOT23-3 - industry-standard 3-pin footprint enabling drop-in replacement and PCB layout reuse across Maxim's MXD181x family. |
Pinout & Package
MXD1817UR22+ is housed in a 3-pin SOT23 package (U3-1 outline), measuring 2.92mm × 1.3mm × 1.0mm, with gull-wing leads and RoHS-compliant lead-free plating (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output - drives high during reset condition; sinks current when deasserted; no external pull required. |
| 2 | VCC | Power supply input and reset threshold monitoring node - supplies internal circuitry and serves as reference for voltage detection. |
| 3 | GND | Ground reference - provides return path for internal comparator, timer, and output stage; must be low-impedance for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.18V threshold | ±2.5% accuracy over full -40°C to +105°C range - eliminates field calibration and supports tight system voltage margining. |
| Active-high push-pull RESET | 350µA source current capability - directly drives high-impedance µP reset inputs without external components or level-shifting. |
| No external components required | Integrated comparator, reference, timer, and output driver - reduces BOM count, board area, and design validation effort. |
| Low 4µA quiescent current | Enables >10-year battery life in coin-cell-powered IoT sensors and portable instrumentation where standby current is critical. |
| Transient-immune VCC monitoring | Rejects fast negative-going glitches ≤1.5µs at 2.18V overdrive - prevents spurious resets in electrically noisy industrial environments. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Battery-powered glucose meters and pulse oximeters require deterministic startup and brownout recovery without firmware intervention. IC Role / Device Role / Timing Role: MXD1817UR22+ acts as primary power-on reset generator and brownout detector, asserting active-high RESET until regulated 3.3V rail stabilizes for ≥100ms. Use Value: Guarantees MCU enters known state before code execution begins, eliminating boot failures caused by marginal VCC ramp rates or transient dips. |
Use Scenario: DIN-rail mounted PLC modules operate in electrically noisy factory floors with fluctuating 24VDC-derived 3.3V supplies. IC Role / Device Role / Timing Role: MXD1817UR22+ supervises the 3.3V domain powering FPGA configuration logic and communication peripherals. Use Value: Its ±2.5% threshold tolerance and 100ms timeout prevent nuisance resets during brief line sags, improving system uptime and diagnostic reliability. |
| Smart Energy Meters | Wireless Sensor Nodes |
|
Use Scenario: ANSI C12.20-compliant electricity meters use supercapacitor backup and must maintain secure boot integrity during AC mains interruptions. IC Role / Device Role / Timing Role: MXD1817UR22+ monitors the 3.3V auxiliary rail derived from supercapacitors, asserting RESET on voltage decay below 2.18V. Use Value: Valid RESET output down to VCC = +1V ensures deterministic reset assertion even as backup energy depletes - critical for cryptographic key protection. |
Use Scenario: LoRaWAN end-nodes powered by CR2032 batteries cycle between deep sleep (1µA) and active transmission (15mA), causing rapid VCC droop. IC Role / Device Role / Timing Role: MXD1817UR22+ provides clean, glitch-free reset initiation during wake-up from brownout conditions induced by RF transmit current surges. Use Value: 4µA supply current minimizes battery drain in sleep mode, while push-pull output ensures immediate, robust reset signal edge without RC delay. |
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, active-low open-drain output, 14µA ICC, same SOT23-3 package | Requires external pull-up; incompatible with µP reset pins expecting active-high assertion | Select only if system design accommodates active-low signaling and can tolerate higher threshold voltage. |
| TPS3808G12QDBVRQ1 | 1.2V threshold option, adjustable timeout via capacitor, 1.6µA ICC, automotive-grade (-40°C to +125°C) | Higher cost, longer qualification cycle; requires external timing capacitor for 100ms setting | Prefer for AEC-Q100 automotive applications where extended temperature range and lower ICC outweigh added BOM complexity. |
Compared with MAX809TRD29+T and TPS3808G12QDBVRQ1, MXD1817UR22+ offers the lowest quiescent current among fixed-threshold active-high supervisors in SOT23-3, with zero external components and guaranteed 2.18V accuracy - making it optimal for cost-sensitive, space-constrained, and battery-limited 2.5V/3.3V embedded systems.
Availability
MXD1817UR22+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart energy meters, and wireless sensor nodes requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MXD1817UR22+ 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 analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MXD181x family was designed specifically for low-power, high-accuracy microprocessor reset supervision in space-constrained portable and industrial systems - emphasizing minimal external components, wide temperature operation, and precise voltage thresholding.
FAQ
What is the reset threshold voltage of the MXD1817UR22+?
The MXD1817UR22+ 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 value is trimmed during production and does not require external adjustment. The 2.18V threshold makes MXD1817UR22+ suitable for monitoring 2.5V and 3.3V power rails where early brownout detection is critical.
Does the MXD1817UR22+ support manual reset functionality?
No, the MXD1817UR22+ does not include manual reset or push-button debounce circuitry. That feature is exclusive to the MXD1813 and MXD1818 variants. MXD1817UR22+ provides only power-supply monitoring and automatic reset assertion - simplifying design for applications where external reset initiation is handled separately or unnecessary.
What is the output configuration of the MXD1817UR22+ RESET pin?
The MXD1817UR22+ features an active-high push-pull RESET output. When asserted, the pin drives high (to VCC); when deasserted, it actively pulls low. This eliminates the need for an external pull-up resistor and ensures fast, clean edges compatible with microprocessors requiring high-active reset signals.
Can the MXD1817UR22+ operate reliably at very low supply voltages?
Yes, the MXD1817UR22+ guarantees correct RESET logic state down to VCC = +1.0V, as confirmed in its Absolute Maximum Ratings and Electrical Characteristics tables. This ensures deterministic reset behavior during deep brownout conditions - a key advantage over many competing supervisors that cease valid output below 1.5V.
Is the MXD1817UR22+ pin-compatible with other devices in the MXD181x family?
Yes, MXD1817UR22+ uses the standard 3-pin SOT23-3 package (U3-1 outline) shared across the MXD1810–MXD1818 series. Pin 1 is RESET, Pin 2 is VCC, and Pin 3 is GND - identical across all variants. However, output polarity (active-high vs. active-low) and internal features (e.g., manual reset) differ, so functional compatibility must be verified per application requirements.
MXD1817UR22+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- 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 High
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MXD1817UR22+ FAQ
1.How can I place an order for MXD1817UR22+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1817UR22+ 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 MXD1817UR22+ reliable?
The price and inventory of MXD1817UR22+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1817UR22+ is usually 5 days.
3.What payment methods are accepted for MXD1817UR22+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1817UR22+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1817UR22+?
MXD1817UR22+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1817UR22+ 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 MXD1817UR22+?
For technical support, including MXD1817UR22+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1817UR22+ requirements.
6.How does Aetrix verify that MXD1817UR22+ is sourced from the original manufacturer or authorized distributors?
All MXD1817UR22+ 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 MXD1817UR22+ meets industry standards.
7.What is the process for return or replacement of MXD1817UR22+?
All MXD1817UR22+ units undergo pre-shipment inspection (PSI). If there is an issue with MXD1817UR22+, 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 MXD1817UR22+ part is unused and in its original packaging.
Return procedure for MXD1817UR22+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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