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Analog Devices Inc./Maxim Integrated MXD1815XR26+
- Part No.:
- MXD1815XR26+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MXD1815XR26+.pdf
- Description:
- IC SUPERVISOR MICROPROCES RESET
- Quantity:
- Payment:
- Shipping:
Inventory:1,665
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Product details
Overview
MXD1815XR26+ from Maxim Integrated is a low-power microprocessor reset supervisor IC designed for +2.5V/+3.0V/+3.3V digital systems. It provides active-low, open-drain RESET output with factory-set 2.55V reset threshold (±2.5% over temperature), 100ms minimum reset timeout, 4μA supply current, and operates from -40°C to +105°C in SC70-3 package. It monitors VCC and asserts reset during brownout or power-up.
For engineers reviewing the MXD1815XR26+ datasheet, MXD1815XR26+ pinout, MXD1815XR26+ application, or MXD1815XR26+ equivalent, key selection criteria include reset threshold accuracy, manual-reset debounce capability (not present in this variant), open-drain drive strength, VCC validity down to +1V, and compatibility with bidirectional μP reset pins in portable and industrial embedded systems.
Technical Context
The MXD1815XR26+ implements a precision voltage comparator with hysteresis to monitor VCC against its 2.55V threshold and trigger an internal timer that holds RESET low for ≥100ms after VCC recovers. Its open-drain output includes a 5.5kΩ internal pullup resistor, eliminating external components while enabling direct interface with bidirectional μP reset pins.
Unlike MXD1813/MXD1818 variants, MXD1815XR26+ lacks manual-reset debounce circuitry - it responds only to VCC-supply faults, not external push-button events. It guarantees valid RESET logic state down to VCC = +1V and rejects fast transients via built-in immunity design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.55V ±2.5% over -40°C to +105°C - ensures reliable brownout detection for 2.5V/3.0V/3.3V rails |
| Reset Timeout Period | 100ms minimum - guarantees sufficient μP initialization time after power recovery |
| Supply Current | 4μA typical at +3.6V - enables multi-year battery life in portable equipment |
| Operating Voltage Range | +1.0V to +5.5V - supports operation down to near-dead-battery conditions |
| Output Type | Open-drain, active-low - allows wired-OR configuration and bidirectional μP interface without external pullup |
| Internal Pullup Resistor | 5.5kΩ - eliminates need for external resistor while ensuring defined high state when RESET inactive |
| Temperature Range | -40°C to +105°C - qualified for industrial and automotive under-hood environments |
Pinout & Package
MXD1815XR26+ is housed in a 3-pin SC70 package (outline X3-2, land pattern 90-0208), measuring 2.0mm × 2.1mm × 0.95mm, optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SC70) / 2 (SOT23) | RESET | Active-low, open-drain reset output - sinks current when asserted; pulled high internally to VCC via 5.5kΩ resistor |
| 2 (SC70) / 1 (SOT23) | VCC | Power supply input and reset-threshold monitoring node - supplies internal circuitry and serves as reference for comparator |
| 3 | GND | Ground reference for all internal functions and output stage - must be connected to system ground plane for stable reset timing |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 2.55V with ±2.5% tolerance over full temperature range - eliminates calibration and reduces BOM count |
| No external components required | Integrated 5.5kΩ pullup and comparator - reduces PCB area and assembly cost vs. discrete reset solutions |
| Low quiescent current | 4μA typical - extends battery runtime in always-on IoT sensors and handheld devices |
| VCC-valid-to-1V operation | Guaranteed RESET logic state down to VCC = +1V - prevents spurious resets during deep brownout |
| Transient immunity | Rejects sub-µs negative VCC glitches - avoids false resets caused by switching noise or ESD |
Applications
| Portable/Battery-Powered Equipment | Critical μP and μC Monitoring |
|---|---|
Use Scenario: Power management in handheld medical meters where battery voltage decays gradually from 3.3V to 2.2V during use. IC Role / Device Role / Timing Role: Supervisory reset generator that asserts RESET when VCC falls below 2.55V and holds it for ≥100ms to ensure clean μC reboot. Use Value: Prevents erratic firmware execution during low-battery brownout, improving device reliability and user safety. | Use Scenario: Industrial PLC controller requiring deterministic startup after AC power interruption. IC Role / Device Role / Timing Role: Primary reset source that monitors 3.3V logic rail and initiates controlled μP reset sequence on undervoltage. Use Value: Eliminates need for external RC network, reducing failure points and enabling faster, repeatable power-cycle recovery. |
| Computers and Controllers | Intelligent Instruments |
Use Scenario: Embedded controller in network switch managing PoE-powered peripherals. IC Role / Device Role / Timing Role: Reset supervisor for ARM-based SoC, interfacing directly with bidirectional reset pin via open-drain topology. Use Value: Enables shared reset bus architecture without external pullups, simplifying layout and supporting hot-swap sequencing. | Use Scenario: Portable oscilloscope with dual-voltage rails (3.3V core, 2.5V ADC). IC Role / Device Role / Timing Role: Dedicated 2.55V supervisor for 2.5V analog subsystem, ensuring ADC initialization occurs only after stable supply. Use Value: Isolates analog domain reset timing from digital rail fluctuations, improving measurement repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD29+T | 2.93V reset threshold, SOT23-3, 14μA ICC, no internal pullup - requires external 100kΩ pullup | Targeted at 3.3V systems needing higher threshold; less suitable for bidirectional reset interfaces | Select when 2.93V trip point better matches system margin or when SOT23 footprint is mandatory |
| TPS3808G125DBVR | 1.25V threshold, adjustable via external resistor, 1.6μA ICC, push-pull output - no internal pullup needed but incompatible with wired-OR | Used in ultra-low-power sensor nodes where sub-2V thresholds or programmability are required | Choose for battery-critical designs needing <2μA current or flexible threshold tuning - not drop-in compatible |
Compared with MXD1815XR26+, MAX809TRD29+T offers higher reset voltage but demands external biasing, while TPS3808G125DBVR delivers lower power and adjustability at the cost of open-drain flexibility and fixed-threshold simplicity.
Availability
MXD1815XR26+ is available at Aetrix Electronics and suitable for portable/battery-powered equipment, critical μP and μC monitoring, computers and controllers, and intelligent instruments requiring stable component supply across industrial temperature ranges.
Supply support for MXD1815XR26+ 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 high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MXD1815XR26+ belongs to the MXD1815–MXD1818 family of low-power μP reset supervisors, engineered specifically for reliable power-monitoring in compact, battery-sensitive 2.5V/3.0V/3.3V embedded systems.
FAQ
What is the exact reset threshold voltage of the MXD1815XR26+?
The MXD1815XR26+ has a factory-trimmed reset threshold of 2.55V, with guaranteed tolerance of ±2.5% over the full operating temperature range (-40°C to +105°C). This value is confirmed in the Electrical Characteristics table under "MXD181_ _ R26" row, with min/typ/max values of 2.47V/2.55V/2.64V.
Does the MXD1815XR26+ support manual reset via an external pushbutton?
No, the MXD1815XR26+ does not include manual-reset debounce functionality. That feature is exclusive to MXD1813 and MXD1818 variants. The MXD1815XR26+ responds only to VCC supply voltage drops below its 2.55V threshold and provides no dedicated circuitry to detect or debounce external button presses on the RESET pin.
What package type and dimensions does the MXD1815XR26+ use?
The MXD1815XR26+ is supplied in a 3-pin SC70 package (package code X3-2, land pattern 90-0208), measuring 2.0mm × 2.1mm × 0.95mm. Its pinout is RESET (pin 1), VCC (pin 2), and GND (pin 3), matching standard SC70-3 footprints used in high-density portable PCB layouts.
Can the MXD1815XR26+ interface directly with a microcontroller that has a bidirectional reset pin?
Yes, the MXD1815XR26+ can interface directly with bidirectional μP reset pins because its open-drain, active-low RESET output (with internal 5.5kΩ pullup) allows shared bus operation. No external pullup resistor is required, and the μP may assert reset independently - as documented in the Applications Information section for interfacing with Motorola 68HC11-style controllers.
What is the minimum supply voltage at which MXD1815XR26+ guarantees valid RESET output logic states?
The MXD1815XR26+ guarantees correct RESET/RESET logic state down to VCC = +1.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. This ensures deterministic behavior during deep brownout conditions where other supervisors may fail unpredictably.
MXD1815XR26+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.55V
- 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
MXD1815XR26+ FAQ
1.How can I place an order for MXD1815XR26+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1815XR26+ 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 MXD1815XR26+ reliable?
The price and inventory of MXD1815XR26+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1815XR26+ is usually 5 days.
3.What payment methods are accepted for MXD1815XR26+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1815XR26+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1815XR26+?
MXD1815XR26+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1815XR26+ 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 MXD1815XR26+?
For technical support, including MXD1815XR26+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1815XR26+ requirements.
6.How does Aetrix verify that MXD1815XR26+ is sourced from the original manufacturer or authorized distributors?
All MXD1815XR26+ 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 MXD1815XR26+ meets industry standards.
7.What is the process for return or replacement of MXD1815XR26+?
All MXD1815XR26+ units undergo pre-shipment inspection (PSI). If there is an issue with MXD1815XR26+, 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 MXD1815XR26+ part is unused and in its original packaging.
Return procedure for MXD1815XR26+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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