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Analog Devices Inc./Maxim Integrated MXD1813UR44+
- Part No.:
- MXD1813UR44+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MXD1813UR44+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:104
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Product details
Overview
MXD1813UR44+ from Maxim Integrated is a low-power microprocessor reset supervisor IC designed for +5V systems, featuring open-drain active-low RESET output with debounced manual-reset capability, 4.37V factory-set reset threshold (±2.5% over temperature), 100ms minimum reset timeout, and operation down to VCC = +1V. It monitors supply integrity and initiates reliable system reset during power-up, brownout, or operator-triggered events in embedded controllers and portable equipment.
For engineers reviewing the MXD1813UR44+ datasheet, MXD1813UR44+ pinout, MXD1813UR44+ application, or MXD1813UR44+ equivalent, key selection criteria include its 4.37V reset threshold accuracy, 1.5μs manual-reset detection latency, internal 5.5kΩ pullup resistor, -40°C to +105°C operating range, and SOT23-3 package compatibility with DS181x-series designs.
Technical Context
The MXD1813UR44+ integrates a precision voltage comparator with hysteresis, a monostable timer for fixed 100ms reset assertion, and dedicated debouncing logic for external push-button inputs. Its reset threshold is factory-trimmed to 4.37V (min 4.25V, max 4.49V) and remains stable across -40°C to +105°C with ±2.5% tolerance.
It operates as an open-drain active-low supervisor: RESET remains high (pulled up internally) until VCC falls below 4.37V or the RESET pin is held low ≥1.5μs, after which RESET stays low for ≥100ms post-recovery or post-release. Supply current is 4μA typical at +3.6V and 9–16μA at +5.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.37V (factory-set, 4.25V–4.49V min/max); ensures reliable reset initiation when +5V rail drops below safe μP operating level |
| Reset Timeout Period | 100ms minimum; guarantees sufficient hold time for full μP initialization before release |
| Supply Current | 4μA typical at +3.6V; enables ultra-low-power operation in battery-backed or energy-sensitive systems |
| Operating Voltage Range | +1.0V to +5.5V; supports valid RESET assertion even during deep brownout conditions |
| Manual Reset Detection | 1.5μs minimum low pulse on RESET pin; rejects switch bounce while enabling fast operator-initiated reset |
| Output Type | Open-drain active-low with internal 5.5kΩ pullup to VCC; simplifies interface to bidirectional μP reset pins without external components |
| Temperature Range | -40°C to +105°C; qualified for industrial and extended-temperature embedded applications |
Pinout & Package
MXD1813UR44+ is housed in a 3-pin SOT23-3 package (JEDEC MO-178AA), footprint-compatible with industry-standard DS181x reset supervisors. The compact 2.92mm × 1.3mm outline supports high-density PCB layouts in space-constrained portable and industrial designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SOT23) | RESET | Open-drain active-low reset output; requires no external pullup; asserts low on VCC drop or manual trigger |
| 2 (SOT23) | VCC | Primary supply input and reset-threshold reference; powers internal circuitry and enables monitoring of +5V rail |
| 3 (SOT23) | GND | Ground reference for comparator, timer, and output stage; must be low-impedance for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Debounced Manual-Reset Input | 1.5μs minimum low pulse detection eliminates mechanical switch bounce without external RC network |
| Factory-Trimmed Reset Threshold | 4.37V ±2.5% over -40°C to +105°C ensures consistent brownout response across environmental stress |
| No External Components Required | Integrated pullup resistor, precision reference, and timing capacitor replace discrete BOM items and reduce layout area |
| Power-Supply Transient Immunity | Rejects negative-going VCC glitches <100ns at 4.37V overdrive, preventing spurious resets in noisy environments |
| Low-Power Operation | 4μA typical ICC at +3.6V extends battery life in portable instrumentation and handheld devices |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
|
Use Scenario: Power cycling and brownout recovery in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Supervises +5V main supply and asserts active-low RESET to ARM Cortex-M7-based controller during undervoltage events. Use Value: Guarantees deterministic boot sequence after line transients, eliminating firmware lockups caused by marginal VCC. |
Use Scenario: Battery-powered ECG and SpO₂ monitors requiring fail-safe startup and user-initiated recalibration. IC Role / Device Role / Timing Role: Provides both power-on reset and debounced push-button reset via tactile switch connected to RESET pin. Use Value: Enables field-serviceable recalibration without host MCU intervention, using only a single momentary switch. |
| Set-Top Box Power Management | Network Router Boot Integrity |
|
Use Scenario: Cold-start and AC dropout recovery in consumer digital video receivers with multi-rail power supplies. IC Role / Device Role / Timing Role: Monitors +5V standby rail and holds SoC in reset until voltage stabilizes above 4.37V for ≥100ms. Use Value: Prevents corrupted firmware loading during unstable input conditions, reducing field return rates. |
Use Scenario: Ensuring clean boot of MIPS-based networking SoCs after PoE power negotiation or thermal shutdown. IC Role / Device Role / Timing Role: Acts as primary reset source for router CPU, interfacing directly to bidirectional reset pin via open-drain topology. Use Value: Eliminates need for external pullup resistor, saving BOM cost and PCB real estate in high-volume production. |
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 | 4.63V reset threshold, no manual-reset input, same SOT23-3 package and open-drain output | Lacks debounced push-button support; suitable only where manual reset is handled externally or not required | Select when higher reset threshold (4.63V vs. 4.37V) aligns better with system brownout margin and manual reset is unnecessary |
| TPS3808G33DBVR | 3.3V reset threshold, adjustable timeout via capacitor, higher quiescent current (12μA typ), same SOT23-6 pinout (not pin-compatible) | Requires external timing capacitor; incompatible pinout prevents drop-in replacement | Choose when system uses +3.3V supply and design flexibility for timeout tuning outweighs need for zero-component simplicity |
Compared with MAX809TRD3+T, MXD1813UR44+ provides tighter threshold control (±2.5% vs. ±2.0%) and integrated manual reset, but trades off slightly lower trip voltage; versus TPS3808G33DBVR, it offers true pin-and-function compatibility with legacy DS181x designs and eliminates external timing components at the cost of fixed timeout.
Availability
MXD1813UR44+ is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, set-top box power management, and network router boot integrity requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MXD1813UR44+ 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 MXD1810–MXD1813/MXD1815–MXD1818 product line delivers ultra-low-power, precision voltage-monitoring solutions for microprocessor reset supervision in space-constrained, thermally demanding, and battery-operated systems.
FAQ
What is the exact reset threshold voltage of the MXD1813UR44+?
The MXD1813UR44+ has a factory-set reset threshold of 4.37V, with guaranteed limits of 4.25V (minimum) and 4.49V (maximum) across -40°C to +105°C. This value is laser-trimmed during production and specified in the Electrical Characteristics table under "Reset Threshold" for suffix R44. The MXD1813UR44+ uses this precise threshold to initiate reset when a +5V supply falls below operational safety margins.
Does the MXD1813UR44+ support manual reset, and how does it work?
Yes, the MXD1813UR44+ includes debounced manual-reset detection: pulling the RESET pin low for ≥1.5μs triggers a full 100ms reset assertion, independent of VCC level. Internal circuitry filters switch bounce, making it compatible with mechanical pushbuttons without external RC networks. After release, MXD1813UR44+ maintains RESET low for the full timeout period, ensuring robust system restart.
What package type and footprint does the MXD1813UR44+ use?
The MXD1813UR44+ is supplied in a 3-pin SOT23-3 package (JEDEC MO-178AA), with pin 1 = RESET, pin 2 = VCC, and pin 3 = GND. Its 2.92mm × 1.3mm outline matches standard DS181x footprints, enabling direct PCB replacement in existing designs. The "+" suffix denotes lead(Pb)-free, RoHS-compliant construction.
Can the MXD1813UR44+ operate reliably at very low supply voltages?
Yes, the MXD1813UR44+ guarantees valid RESET/RESET logic states down to VCC = +1.0V, as confirmed in Absolute Maximum Ratings and Electrical Characteristics. This allows controlled reset assertion even during deep brownout conditions where other supervisors may lose functionality - a critical capability for fail-safe behavior in the MXD1813UR44+.
Is an external pullup resistor required for the MXD1813UR44+ RESET output?
No. The MXD1813UR44+ features an internal 5.5kΩ pullup resistor to VCC on its open-drain RESET output, eliminating the need for external components. This simplifies design, reduces BOM count, and ensures proper high-state biasing when RESET is inactive - a key differentiator of the MXD1813UR44+ versus basic reset ICs requiring external pullups.
MXD1813UR44+ 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:
- 4.37V
- Output:
- Open Drain or Open Collector
- 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
MXD1813UR44+ FAQ
1.How can I place an order for MXD1813UR44+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1813UR44+ 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 MXD1813UR44+ reliable?
The price and inventory of MXD1813UR44+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1813UR44+ is usually 5 days.
3.What payment methods are accepted for MXD1813UR44+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1813UR44+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1813UR44+?
MXD1813UR44+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1813UR44+ 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 MXD1813UR44+?
For technical support, including MXD1813UR44+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1813UR44+ requirements.
6.How does Aetrix verify that MXD1813UR44+ is sourced from the original manufacturer or authorized distributors?
All MXD1813UR44+ 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 MXD1813UR44+ meets industry standards.
7.What is the process for return or replacement of MXD1813UR44+?
All MXD1813UR44+ units undergo pre-shipment inspection (PSI). If there is an issue with MXD1813UR44+, 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 MXD1813UR44+ part is unused and in its original packaging.
Return procedure for MXD1813UR44+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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