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Analog Devices Inc./Maxim Integrated MXD1818UR23+
- Part No.:
- MXD1818UR23+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MXD1818UR23+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,304
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Product details
Overview
MXD1818UR23+ from Maxim Integrated is a low-power microprocessor reset supervisor IC in SOT23-3 package, featuring open-drain active-low RESET output with debounced manual-reset capability, factory-set 2.31V reset threshold (±2.5% over temperature), 100ms minimum reset timeout, and operation down to VCC = +1V. It monitors +2.5V/+3.0V/+3.3V power rails in portable and industrial embedded systems requiring reliable brownout protection.
For engineers reviewing the MXD1818UR23+ datasheet, MXD1818UR23+ pinout, MXD1818UR23+ application, or MXD1818UR23+ equivalent, key selection criteria include its 2.31V threshold accuracy, 4μA supply current, internal 5.5kΩ pullup resistor, pushbutton debounce timing (1.5μs detect, 100ms timeout), and guaranteed RESET validity at VCC ≥ +1V.
Technical Context
The MXD1818UR23+ implements a precision bandgap-based voltage comparator with hysteresis to monitor VCC against a factory-trimmed 2.31V threshold, rejecting transients up to 100μs at 200mV overdrive. Its internal timer ensures reset remains asserted for ≥100ms after VCC recovers above threshold.
As an open-drain active-low device with integrated 5.5kΩ pullup, it interfaces directly with bidirectional μP reset pins without external components; manual reset is triggered by a ≥1.5μs low pulse on RESET, followed by debounced 100ms timeout upon release.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.31V ±2.5% over -40°C to +105°C - ensures reliable detection of 2.5V/3.0V/3.3V rail brownout |
| Supply Current | 4μA typical at +3.6V - enables multi-year battery life in portable equipment |
| Reset Timeout | 100ms minimum - meets μP power-up initialization timing requirements |
| VCC Operating Range | +1.0V to +5.5V - guarantees valid RESET output even during deep brownout |
| Manual Reset Detect | 1.5μs minimum low pulse - rejects mechanical switch bounce while enabling user-initiated reset |
| Internal Pullup | 5.5kΩ - eliminates need for external resistor when interfacing with bidirectional μP reset pins |
| Output Sink Current | 10mA at VOUT = 0.4V - drives standard CMOS inputs and small capacitive loads |
Pinout & Package
MXD1818UR23+ is housed in a 3-pin SOT23 package (U3-1 outline), footprint-compatible with industry-standard SC70-3 and pin-compatible with DS181x series supervisors.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Open-drain active-low output with internal 5.5kΩ pullup to VCC; accepts manual reset pulses ≥1.5μs |
| 2 | VCC | Power supply input and reset threshold monitoring node; operates from +1.0V to +5.5V |
| 3 | GND | Ground reference for comparator, timer, and output stage; must be low-impedance for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Debounced Manual Reset | 1.5μs minimum pulse detect + 100ms timeout ensures clean reset initiation from mechanical switches |
| Factory-Set Precision Threshold | 2.31V ±2.5% over full temperature range eliminates calibration and reduces BOM count |
| Transient Immunity | Rejects VCC glitches ≤100μs at 200mV overdrive - prevents false resets in noisy environments |
| No External Components | Integrated pullup, comparator, timer, and debounce logic enable single-chip reset supervision |
| Low-Power Operation | 4μA supply current allows use in always-on battery-backed systems without significant drain |
Applications
| Computers and Controllers | Intelligent Instruments |
|---|---|
Use Scenario: Monitoring 3.3V core supply in industrial PLC controllers during line-voltage sags. IC Role / Device Role / Timing Role: Active-low reset supervisor asserting RESET until VCC stabilizes >2.31V for ≥100ms. Use Value: Prevents firmware corruption by ensuring CPU remains held in reset during undervoltage events. | Use Scenario: Power-rail supervision in handheld multimeters powered by two AA cells. IC Role / Device Role / Timing Role: Brownout detector with manual reset via front-panel button. Use Value: Enables user-triggered recalibration reset without adding external debounce circuitry. |
| Set-Top Boxes | Portable/Battery-Powered Equipment |
Use Scenario: Ensuring clean boot sequence after AC power interruption in digital cable receivers. IC Role / Device Role / Timing Role: Open-drain RESET output tied to SoC reset pin with internal pullup. Use Value: Eliminates need for external pullup resistor, saving PCB space and cost in high-volume consumer devices. | Use Scenario: Supervising 2.5V LDO output in Bluetooth earbud charging case MCU. IC Role / Device Role / Timing Role: Low-quiescent-current (4μA) supervisor maintaining reset validity down to VCC = +1V. Use Value: Guarantees safe shutdown before battery depletion, preventing data loss in flash memory writes. |
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 | 2.93V reset threshold, no manual reset, 140μA supply current | Suitable only for higher-voltage 3.3V systems without pushbutton requirement | Select when higher threshold and lower cost outweigh manual reset need |
| TPS3808G125DBVR | 1.25V threshold, adjustable delay, 1.1μA quiescent current, SOT23-5 | Requires external capacitor for timing; optimized for ultra-low-power sensor nodes | Prefer for sub-μA systems where timing flexibility justifies extra component and pin count |
Compared with MAX809TRD3+T and TPS3808G125DBVR, MXD1818UR23+ uniquely combines 2.31V precision threshold, integrated manual-reset debounce, and 4μA consumption in a 3-pin SOT23 - making it optimal for space-constrained 2.5V–3.3V portable designs requiring user-initiated reset.
Availability
MXD1818UR23+ is available at Aetrix Electronics and suitable for computers and controllers, intelligent instruments, and portable/battery-powered equipment requiring stable component supply across industrial temperature ranges.
Supply support for MXD1818UR23+ 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 industrial, communications, and computing applications.
The MXD1810–MXD1818 family delivers low-power, factory-trimmed reset supervision for microprocessor-based systems operating at 2.5V, 3.0V, 3.3V, and 5V - targeting cost-sensitive, space-constrained embedded designs.
FAQ
What is the exact reset threshold voltage of MXD1818UR23+ and how accurate is it over temperature?
The MXD1818UR23+ has a factory-set reset threshold of 2.31V, with ±2.5% accuracy guaranteed over the full operating temperature range of -40°C to +105°C. This value is confirmed in the Electrical Characteristics table under VTH for suffix R23, and applies specifically to the MXD1818UR23+ variant within the MXD1815–MXD1818 subfamily designed for 2.5V/3.0V/3.3V systems.
Does MXD1818UR23+ support manual reset, and what are the timing requirements?
Yes, MXD1818UR23+ supports debounced manual reset via its open-drain RESET pin. A logic-low pulse of ≥1.5μs duration triggers the reset function, and the output remains asserted for ≥100ms after the external signal is released. This behavior is exclusive to MXD1813/MXD1818 variants and is documented in the Push-Button Reset section and tPB/tPBRST specifications.
What package type and pin configuration does MXD1818UR23+ use?
MXD1818UR23+ uses the 3-pin SOT23 package (U3-1 outline), with pin 1 as RESET (open-drain active-low), pin 2 as VCC, and pin 3 as GND. This matches the MXD181_U SOT23-3 top-view diagram and ordering code "UR" in the part number, confirming SOT23 packaging per the Ordering Information table.
Can MXD1818UR23+ operate reliably at very low supply voltages?
Yes, MXD1818UR23+ is guaranteed to maintain valid RESET/RESET logic states down to VCC = +1.0V, as specified in Absolute Maximum Ratings and Electrical Characteristics. This ensures deterministic reset behavior during deep brownout conditions common in battery-powered systems approaching end-of-life.
Is an external pullup resistor required when using MXD1818UR23+?
No, MXD1818UR23+ includes an internal 5.5kΩ pullup resistor on its open-drain RESET pin, eliminating the need for an external component. This is explicitly stated in the Pin Descriptions and Electrical Characteristics (RP parameter), and enables direct interface with bidirectional μP reset pins such as those found on Motorola 68HC11 derivatives.
MXD1818UR23+ 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:
- 2.31V
- 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:
- SOT-23-3
MXD1818UR23+ FAQ
1.How can I place an order for MXD1818UR23+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1818UR23+ 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 MXD1818UR23+ reliable?
The price and inventory of MXD1818UR23+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1818UR23+ is usually 5 days.
3.What payment methods are accepted for MXD1818UR23+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1818UR23+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1818UR23+?
MXD1818UR23+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1818UR23+ 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 MXD1818UR23+?
For technical support, including MXD1818UR23+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1818UR23+ requirements.
6.How does Aetrix verify that MXD1818UR23+ is sourced from the original manufacturer or authorized distributors?
All MXD1818UR23+ 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 MXD1818UR23+ meets industry standards.
7.What is the process for return or replacement of MXD1818UR23+?
All MXD1818UR23+ units undergo pre-shipment inspection (PSI). If there is an issue with MXD1818UR23+, 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 MXD1818UR23+ part is unused and in its original packaging.
Return procedure for MXD1818UR23+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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