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Analog Devices Inc./Maxim Integrated MXD1810XR44+T
- Part No.:
- MXD1810XR44+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MXD1810XR44+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,440
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Product details
Overview
MXD1810XR44+T from Maxim Integrated is a precision 5V-system microprocessor reset supervisor IC in SC70-3 package, featuring active-low open-drain RESET output, factory-set 4.37V reset threshold (±2.5% over temperature), 100ms minimum reset timeout, and guaranteed operation down to VCC = +1V. It monitors power supply integrity during power-up, brownout, and power-down in embedded controllers and portable equipment.
For engineers reviewing the MXD1810XR44+T datasheet, MXD1810XR44+T pinout, MXD1810XR44+T application, or MXD1810XR44+T equivalent, key selection criteria include reset threshold accuracy, open-drain drive capability with internal 5.5kΩ pullup, transient immunity against sub-10µs VCC glitches, and compatibility with bidirectional µP reset pins without external components.
Technical Context
This device implements a precision bandgap-based voltage comparator with hysteresis-free threshold detection and an internal monostable timer for fixed 100ms reset assertion after VCC recovery. Its open-drain RESET output interfaces directly with µPs having bidirectional reset inputs-no external pullup required-while maintaining valid logic levels across -40°C to +105°C.
The MXD1810XR44+T operates with only 4µA typical supply current at +3.6V and tolerates VCC transients as short as 1.5µs without false triggering, thanks to built-in noise rejection circuitry. It is not equipped with manual-reset debouncing (a feature exclusive to MXD1813/MXD1818 variants) and does not support push-button initiation of reset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.37V ±2.5% over -40°C to +105°C - ensures reliable reset assertion before 5V system brownout affects µP operation |
| Reset Timeout Period | 100ms minimum - guarantees sufficient hold time for µP initialization and peripheral stabilization |
| Supply Current | 4µA typical at +3.6V - enables use in battery-powered systems with multi-year standby life |
| VCC Operating Range | +1.0V to +5.5V - supports valid RESET output state even during deep undervoltage conditions |
| Output Type | Active-low open-drain with internal 5.5kΩ pullup to VCC - eliminates need for external resistor when interfacing with bidirectional µP reset pins |
| Transient Immunity | Rejects VCC glitches <10µs duration at 4.37V threshold overdrive - prevents spurious resets from switching noise or ESD coupling |
| Package | 3-pin SC70 - 2.0mm × 2.1mm footprint ideal for space-constrained portable designs |
Pinout & Package
MXD1810XR44+T is housed in a 3-pin SC70 package (outline X3-2, land pattern 90-0208), with 0.65mm pitch and exposed pad optional per Maxim's package drawings. Pin 1 is RESET (open-drain, active-low), Pin 2 is VCC (supply and threshold monitor input), and Pin 3 is GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Open-drain active-low reset output; sinks current when asserted; pulled high internally via 5.5kΩ to VCC when deasserted |
| 2 | VCC | Primary power supply input and analog reference for reset threshold comparator; also powers internal logic and pullup |
| 3 | GND | Analog and digital ground reference; must be low-impedance connection to maintain comparator accuracy and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated voltage reference, comparator, timer, and pullup eliminate discrete BOM items and layout complexity |
| Precision reset threshold | Factory-trimmed 4.37V ±2.5% over full temperature range ensures consistent brownout detection across operating environments |
| Ultra-low quiescent current | 4µA typical at +3.6V enables >10-year battery life in coin-cell–powered monitoring applications |
| Bidirectional µP reset compatibility | Open-drain output allows shared reset bus with microcontrollers like Motorola 68HC11 without contention or level-shifting |
| Robust transient immunity | Immune to VCC glitches under 10µs duration at nominal threshold overdrive - avoids false resets in noisy industrial or automotive power domains |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
|
Use Scenario: Monitoring 5V logic rails in programmable logic controller I/O modules subject to field-induced transients and thermal cycling. IC Role / Device Role / Timing Role: Supervisory reset generator ensuring deterministic µP restart after brownout or cold start, with precise 4.37V threshold aligned to 5V system tolerance. Use Value: Prevents firmware corruption by guaranteeing reset remains asserted until VCC stabilizes above 4.37V and holds for ≥100ms, meeting IEC 61000-4-4 immunity requirements. |
Use Scenario: Power management in handheld ECG or pulse oximeter units powered by single-cell Li-ion batteries with regulated 5V rail. IC Role / Device Role / Timing Role: Low-power reset supervisor enabling safe boot sequence and graceful shutdown during battery depletion. Use Value: 4µA supply current extends usable battery life; operation down to VCC = +1V ensures reset validity through final discharge phase before cutoff. |
| Set-Top Box Mainboard | Network Edge Router Control Plane |
|
Use Scenario: Ensuring reliable boot of ARM-based SoC in consumer set-top boxes where 5V rail may experience slow ramp-up or ripple. IC Role / Device Role / Timing Role: Voltage-monitoring reset circuit asserting active-low signal to SoC reset pin during power-on sequencing. Use Value: Internal 5.5kΩ pullup eliminates external component while supporting bidirectional reset bus - simplifies layout and reduces BOM count. |
Use Scenario: Supervising control-plane µP in carrier-grade routers where 5V auxiliary supply must remain stable during hot-swap events. IC Role / Device Role / Timing Role: Precision reset supervisor detecting undershoot on 5V rail caused by load-step transients from FPGA configuration. Use Value: ±2.5% threshold accuracy and 100ms timeout prevent premature release of reset, avoiding race conditions in multi-phase boot firmware. |
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 | Same 4.37V threshold, SOT23-3 package, push-pull active-low output (no internal pullup) | Requires external pullup for bidirectional µP interfaces; higher ICC (15µA typ) | Select when board already uses push-pull topology or needs lower output impedance during reset assertion |
| TPS3808G33DBVR | 3.3V threshold, adjustable delay (1ms–10s), SOT23-6 package, higher ICC (12µA typ) | Not suitable for 5V systems; requires external timing capacitor; larger footprint | Choose only if system requires programmable timeout or operates at 3.3V with tighter margin control |
Compared with MAX809TRD3+T, MXD1810XR44+T offers integrated pullup and lower ICC but lacks push-pull drive strength; compared with TPS3808G33DBVR, it provides exact 5V-system fit with smaller size and simpler implementation, though without delay configurability.
Availability
MXD1810XR44+T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, set-top box mainboards, network edge router control planes, and battery-powered instrumentation requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.
Supply support for MXD1810XR44+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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.
The MXD1810–MXD1818 family was designed specifically for cost-sensitive, space-constrained microprocessor supervisory applications in 5V and 3.3V systems, emphasizing ultra-low power, precision threshold accuracy, and minimal external component count.
FAQ
What is the reset threshold voltage of the MXD1810XR44+T?
The MXD1810XR44+T has a factory-set reset threshold of 4.37V, with guaranteed accuracy of ±2.5% over the full operating temperature range (-40°C to +105°C). This value is confirmed in the Electrical Characteristics table under "Reset Threshold" for suffix R44, and applies specifically to the MXD1810XR44+T-not to other members of the MXD1810–MXD1818 family.
Does the MXD1810XR44+T support manual reset via an external pushbutton?
No, the MXD1810XR44+T does not include manual-reset debouncing functionality. That feature is exclusive to the MXD1813 and MXD1818 variants. The MXD1810XR44+T asserts reset solely based on VCC voltage falling below 4.37V and maintains it for ≥100ms after VCC rises above threshold.
What is the function of the internal pullup resistor in the MXD1810XR44+T?
The MXD1810XR44+T includes an internal 5.5kΩ pullup resistor connected between the open-drain RESET pin and VCC. This eliminates the need for an external pullup when interfacing with microprocessors that have bidirectional reset pins, such as the Motorola 68HC11, simplifying PCB layout and reducing component count.
Can the MXD1810XR44+T operate reliably at VCC = +1.0V?
Yes, the MXD1810XR44+T is guaranteed to maintain correct RESET logic state down to VCC = +1.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. However, its RESET output may drift indeterminate below +1.0V due to reduced sinking capability-designs requiring validity at 0V need external pulldown resistors.
Is the MXD1810XR44+T pin-compatible with DS181x-series devices?
Yes, the MXD1810XR44+T is pin-compatible with DS181x-series reset supervisors in the same SC70-3 package, as explicitly stated in the Features section of the datasheet. This allows drop-in replacement in existing designs using DS1810/DS1811 with identical footprint and pin assignments.
MXD1810XR44+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:
- 4.37V
- 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
MXD1810XR44+T FAQ
1.How can I place an order for MXD1810XR44+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1810XR44+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 MXD1810XR44+T reliable?
The price and inventory of MXD1810XR44+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1810XR44+T is usually 5 days.
3.What payment methods are accepted for MXD1810XR44+T?
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MXD1810XR44+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1810XR44+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 MXD1810XR44+T?
For technical support, including MXD1810XR44+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1810XR44+T requirements.
6.How does Aetrix verify that MXD1810XR44+T is sourced from the original manufacturer or authorized distributors?
All MXD1810XR44+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 MXD1810XR44+T meets industry standards.
7.What is the process for return or replacement of MXD1810XR44+T?
All MXD1810XR44+T units undergo pre-shipment inspection (PSI). If there is an issue with MXD1810XR44+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 MXD1810XR44+T part is unused and in its original packaging.
Return procedure for MXD1810XR44+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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