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Analog Devices Inc./Maxim Integrated MXD1818UR29-T
- Part No.:
- MXD1818UR29-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MXD1818UR29-T.pdf
- Description:
- IC SUPERVISOR MICROPROCES RESET
- Quantity:
- Payment:
- Shipping:
Inventory:4,985
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Product details
Overview
MXD1818UR29-T from Maxim Integrated is a low-power microprocessor reset supervisor IC in SOT23-3 package, designed to monitor +2.5V/+3.0V/+3.3V power supplies and assert an active-low open-drain RESET signal when VCC drops below 2.88V (±2.5% accuracy), with 100ms minimum reset timeout and debounced manual-reset capability for pushbutton interfaces in portable embedded systems.
For engineers reviewing the MXD1818UR29-T datasheet, MXD1818UR29-T pinout, MXD1818UR29-T application, or MXD1818UR29-T equivalent, key selection criteria include its 2.88V factory-trimmed reset threshold, 4μA supply current at +3.6V, internal 5.5kΩ pullup resistor, -40°C to +105°C operating range, and compatibility with mechanical switch debounce timing requirements.
Technical Context
The MXD1818UR29-T implements a precision bandgap-based voltage comparator with hysteresis to detect VCC falling below 2.88V, triggering an open-drain active-low RESET output that remains asserted for ≥100ms after VCC recovers. Its internal debouncing circuit responds to RESET pin low pulses ≥1.5μs, initiating a separate 100ms manual-reset timeout period upon switch release.
This device operates across VCC = 1.2V to 5.5V and guarantees valid RESET logic states down to VCC = +1V. It features transient immunity against fast negative-going VCC glitches and requires no external components-its internal 5.5kΩ pullup eliminates need for external biasing in bidirectional μP reset interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.88V ±2.5% - factory-trimmed for reliable brownout detection in +2.5V/+3.3V systems |
| Supply Current | 4μA at +3.6V - enables multi-year battery life in portable equipment |
| Reset Timeout | 100ms min - ensures full μP initialization before release of reset state |
| Operating Temp | -40°C to +105°C - supports industrial and automotive under-hood environments |
| Package | SOT23-3 - 2.92mm × 1.3mm footprint compatible with high-density PCB layouts |
| Output Type | Open-drain active-low with internal 5.5kΩ pullup - simplifies interface to bidirectional μP reset pins |
| Manual Reset | Debounced via 1.5μs minimum pulse detection - eliminates switch bounce false triggers |
Pinout & Package
MXD1818UR29-T is housed in a 3-pin SOT23 package (U3-1 outline) with 2.92mm × 1.3mm body size and 0.95mm pitch. Pin 1 is RESET (open-drain active-low), Pin 2 is VCC (supply input and threshold monitor), and Pin 3 is GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Open-drain active-low reset output with internal 5.5kΩ pullup to VCC; accepts manual reset pulses ≥1.5μs |
| 2 | VCC | Power supply input and analog reference for reset threshold comparator; operates from 1.2V to 5.5V |
| 3 | GND | Ground reference for comparator and output stage; must be low-impedance for accurate threshold sensing |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 2.88V threshold | Eliminates external resistor networks and calibration effort for +2.5V/+3.3V system monitoring |
| Debounced manual reset | Enables direct connection to mechanical pushbuttons without external RC filtering or firmware debounce logic |
| Internal 5.5kΩ pullup | Permits direct interfacing to bidirectional μP reset pins (e.g., Motorola 68HC11) without external components |
| 4μA supply current | Reduces quiescent power in always-on subsystems such as real-time clock supervisors or battery-backed modules |
| VCC = +1V RESET validity | Ensures deterministic reset behavior during deep brownout conditions where other supervisors may float or misfire |
Applications
| Industrial Controllers | Portable Medical Devices |
|---|---|
Use Scenario: Monitoring 3.3V power rails in PLC I/O modules subject to voltage sags during relay switching. IC Role / Device Role / Timing Role: Supervisor IC asserting active-low RESET to ARM Cortex-M7 microcontroller until stable 3.3V rail is confirmed. Use Value: Prevents corrupted register writes during brownout by enforcing 100ms minimum reset hold time after VCC recovery. | Use Scenario: Power sequencing in handheld glucose meters powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Reset generator detecting discharge-induced VCC drop below 2.88V and enabling manual reset via tactile button. Use Value: Guarantees safe restart after low-battery shutdown while supporting user-initiated recalibration via debounced hardware reset. |
| Set-Top Box Power Management | Smart Meter MCU Supervision |
Use Scenario: Ensuring clean boot of MIPS-based SoC after AC power interruption or standby wake-up. IC Role / Device Role / Timing Role: Active-low open-drain RESET output tied to SoC reset pin with internal pullup eliminating external resistor. Use Value: Reduces BOM count and PCB area versus discrete reset solutions while maintaining 100ms reset assertion for flash memory initialization. | Use Scenario: Monitoring 3.0V auxiliary supply in utility-grade smart meters operating at -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Brownout detector asserting RESET to RISC-V MCU when VCC falls below 2.88V due to capacitor aging or load surge. Use Value: Delivers ±2.5% threshold accuracy over full temperature range, preventing premature resets in cold-weather deployments. |
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 | Same 2.88V threshold, 140μA supply current, SOT23-3, but lacks manual reset debounce | No hardware pushbutton support; requires external RC or firmware debounce | Select when manual reset is not required and lower cost outweighs higher quiescent current |
| TPS3808G33DBVR | 2.93V threshold, 16μA supply current, adjustable delay, but requires external pullup for open-drain operation | Flexible timeout configuration but adds component count and layout complexity | Select when programmable reset duration is needed and design can accommodate external biasing |
Compared with MAX809TRD29+T and TPS3808G33DBVR, the MXD1818UR29-T uniquely combines ultra-low 4μA quiescent current, factory-trimmed 2.88V threshold, integrated pullup, and hardware-debounced manual reset in a 3-pin SOT23-making it optimal for space-constrained, battery-sensitive applications requiring robust pushbutton interaction.
Availability
MXD1818UR29-T is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, set-top boxes, smart meters, and battery-powered instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MXD1818UR29-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, mixed-signal, and power management ICs for industrial, computing, communications, and consumer applications.
The MXD1810–MXD1818 family targets cost-sensitive, space-constrained embedded systems needing reliable, low-power power-supply monitoring and reset generation without external components.
FAQ
What is the exact reset threshold voltage of the MXD1818UR29-T and how tightly is it specified?
The MXD1818UR29-T has a factory-set reset threshold of 2.88V, with guaranteed accuracy of ±2.5% over the full operating temperature range (-40°C to +105°C). This value is trimmed during production and documented in the Electrical Characteristics table under VTH for suffix "R29". The MXD1818UR29-T maintains this precision without requiring external calibration or resistive dividers.
Does the MXD1818UR29-T require an external pullup resistor on the RESET pin?
No, the MXD1818UR29-T does not require an external pullup resistor because it integrates a 5.5kΩ internal pullup to VCC on its open-drain RESET output. This allows direct connection to bidirectional microprocessor reset pins (e.g., Motorola 68HC11) without additional components-reducing BOM count and PCB area while ensuring proper logic-high idle state.
How does the manual reset debounce function work on the MXD1818UR29-T?
The MXD1818UR29-T detects a logic-low signal on its RESET pin lasting ≥1.5μs and initiates a debounced manual reset sequence. Upon release of the external switch, it asserts RESET for a guaranteed minimum of 100ms (tPBRST), independent of VCC recovery timing. This eliminates mechanical switch bounce artifacts and removes the need for external RC filters or firmware-based debouncing routines.
What is the minimum supply voltage at which the MXD1818UR29-T guarantees valid RESET output logic levels?
The MXD1818UR29-T guarantees correct RESET/RESET logic states down to VCC = +1V across the full operating temperature range. This ensures deterministic reset behavior during deep brownout conditions where other supervisors may exhibit undefined output states, making the MXD1818UR29-T suitable for fail-safe applications in battery-powered systems approaching end-of-discharge.
Can the MXD1818UR29-T be used in both +3.3V and +2.5V systems?
Yes, the MXD1818UR29-T is explicitly qualified for use in +2.5V, +3.0V, and +3.3V digital systems, as stated in its General Description and Applications sections. Its 2.88V reset threshold provides appropriate margin above typical 2.5V rail tolerances (+/-5%) and below nominal 3.3V levels, enabling reliable brownout detection across both voltage domains without redesign.
MXD1818UR29-T 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:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.88V
- 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
MXD1818UR29-T FAQ
1.How can I place an order for MXD1818UR29-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1818UR29-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 MXD1818UR29-T reliable?
The price and inventory of MXD1818UR29-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1818UR29-T is usually 5 days.
3.What payment methods are accepted for MXD1818UR29-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1818UR29-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1818UR29-T?
MXD1818UR29-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1818UR29-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 MXD1818UR29-T?
For technical support, including MXD1818UR29-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1818UR29-T requirements.
6.How does Aetrix verify that MXD1818UR29-T is sourced from the original manufacturer or authorized distributors?
All MXD1818UR29-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 MXD1818UR29-T meets industry standards.
7.What is the process for return or replacement of MXD1818UR29-T?
All MXD1818UR29-T units undergo pre-shipment inspection (PSI). If there is an issue with MXD1818UR29-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 MXD1818UR29-T part is unused and in its original packaging.
Return procedure for MXD1818UR29-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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