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Analog Devices Inc./Maxim Integrated MXD1815XR29+T
- Part No.:
- MXD1815XR29+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MXD1815XR29+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,300
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Product details
Overview
MXD1815XR29+T from Maxim Integrated is a low-power microprocessor reset supervisor IC designed to monitor +2.5V/+3.0V/+3.3V power supplies and assert an active-low, open-drain RESET signal when VCC falls below 2.88V (±2.5% over temperature), with a guaranteed 100ms minimum reset timeout period and internal 5.5kΩ pullup resistor - used in portable battery-powered equipment, set-top boxes, and critical μP monitoring systems.
For engineers reviewing the MXD1815XR29+T datasheet, MXD1815XR29+T pinout, MXD1815XR29+T application, or MXD1815XR29+T equivalent, key selection considerations include its factory-trimmed 2.88V reset threshold, SC70-3 package footprint, -40°C to +105°C operating range, open-drain output compatibility with bidirectional μP reset pins, and immunity to sub-5µs VCC transients.
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. It operates down to VCC = +1.0V and guarantees valid RESET logic states across the full temperature range.
The MXD1815XR29+T features open-drain active-low RESET output with integrated 5.5kΩ pullup resistor, no external components required, and transient immunity validated up to 100µs at 200mV overdrive - distinguishing it from push-pull variants like MXD1812/MXD1817 and manual-reset-enabled MXD1818.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.88V ±2.5% over -40°C to +105°C - ensures reliable brownout detection for 2.5V/3.0V/3.3V systems |
| Reset Timeout Period | 100ms minimum - guarantees sufficient μP initialization time after power recovery |
| Supply Current | 4µA typical at +3.6V - enables multi-year operation in battery-backed applications |
| Operating Voltage Range | +1.0V to +5.5V - supports valid reset assertion even during deep brownout |
| Output Type | Open-drain, active-low with 5.5kΩ internal pullup - eliminates need for external resistor and interfaces directly with bidirectional μP reset pins |
| Package | 3-pin SC70 - 2.0mm × 2.1mm footprint ideal for space-constrained portable designs |
| Temperature Range | -40°C to +105°C - qualified for industrial and extended-temperature embedded use |
Pinout & Package
MXD1815XR29+T is housed in a 3-pin SC70 package (outline X3-2, land pattern 90-0208), with pin 1 = RESET (open-drain active-low), pin 2 = VCC (supply and threshold monitor input), and pin 3 = GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Open-drain active-low reset output; pulled high internally via 5.5kΩ to VCC; sinks ≥10mA when asserted |
| 2 | VCC | Power supply input and reset threshold reference node; monitors system rail for brownout conditions |
| 3 | GND | Ground reference for comparator, timer, and output stage; must be low-impedance for accurate threshold tracking |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | Factory-trimmed 2.88V with ±2.5% accuracy over full temperature range - eliminates calibration overhead |
| No external components | Integrated pullup resistor and comparator-timer core - reduces BOM count and PCB area vs. discrete solutions |
| Low quiescent current | 4µA typical supply current - extends battery life in always-on portable instrumentation |
| VCC transient immunity | Rejects negative-going VCC glitches <100µs at 200mV overdrive - prevents spurious resets in noisy environments |
| Guaranteed operation down to 1.0V | Valid RESET logic state maintained until VCC drops to +1.0V - supports graceful shutdown sequencing |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered ECG and pulse oximeter units requiring reliable power-on reset and brownout protection during intermittent charging cycles. IC Role / Device Role / Timing Role: Supervisory IC asserting active-low RESET to ARM Cortex-M microcontroller during VCC drop below 2.88V, holding reset for ≥100ms post-recovery. Use Value: Prevents corrupted firmware execution during low-battery brownout, leveraging 4µA quiescent current to maximize runtime between charges. |
Use Scenario: DIN-rail mounted programmable logic controller modules exposed to 24VDC supply ripple and thermal cycling in factory automation cabinets. IC Role / Device Role / Timing Role: Reset supervisor monitoring isolated 3.3V logic rail derived from switching power supply; triggers cold boot on undervoltage event. Use Value: Ensures deterministic startup after line disturbance using ±2.5% threshold accuracy and -40°C to +105°C qualification. |
| Set-Top Box Power Management | Smart Meter MCU Supervision |
Use Scenario: Consumer digital video recorder with dual-rail power (5V analog, 3.3V digital) where 3.3V rail instability must halt processor execution before data corruption occurs. IC Role / Device Role / Timing Role: Active-low open-drain RESET output tied directly to SoC reset pin, compatible with bidirectional reset architecture without external pullup. Use Value: Eliminates external resistor while maintaining noise-immune reset timing via internal 5.5kΩ pullup and 100ms timeout. |
Use Scenario: ANSI C12.22-compliant electricity meter with tamper-detection circuitry requiring guaranteed reset assertion during battery backup switchover. IC Role / Device Role / Timing Role: Monitoring 3.0V RTC and communication subsystem rail; asserts RESET if VCC dips below 2.88V during capacitor discharge phase. Use Value: Maintains valid reset state down to VCC = +1.0V, ensuring safe state retention during extended power loss events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR29+T | Same 2.88V threshold, 100ms timeout, SC70-3 package, but higher 10µA supply current and no internal pullup - requires external resistor | Lacks integrated pullup; less suitable for bidirectional μP reset interfaces without added component | Choose only if legacy MAX6326 design reuse is required and external pullup is acceptable |
| TPS3808G18DBVR | 2.88V threshold, 200ms timeout, SOT23-6 package, 1.4µA supply current, but no internal pullup and different pinout | Requires external pullup and PCB layout change; longer timeout may delay system recovery | Select when ultra-low current (<2µA) is critical and board redesign is feasible |
Compared with MXD1815XR29+T, MAX6326XR29+T increases BOM count due to missing internal pullup, while TPS3808G18DBVR trades 6µA lower current for longer reset hold time and incompatible packaging - making MXD1815XR29+T optimal for space- and component-constrained 3.3V portable designs.
Availability
MXD1815XR29+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, and smart meter MCU supervision requiring stable component supply, long-term lifecycle support, and RoHS-compliant lead-free packaging.
Supply support for MXD1815XR29+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 and mixed-signal ICs for industrial, communications, and consumer applications, with emphasis on power management, sensing, and interface solutions.
The MXD1815XR29+T belongs to the MXD1815–MXD1818 family of low-power μP reset supervisors targeting 2.5V/3.0V/3.3V systems - engineered for minimal footprint, zero external components, and robust operation in battery-powered and thermally demanding environments.
FAQ
What is the exact reset threshold voltage of the MXD1815XR29+T and how stable is it over temperature?
The MXD1815XR29+T has a factory-set reset threshold of 2.88V with ±2.5% accuracy over the full -40°C to +105°C operating range. This specification is guaranteed by design and verified across temperature extremes, ensuring consistent brownout detection for 2.5V/3.0V/3.3V rails without recalibration. The MXD1815XR29+T maintains this tolerance using bandgap-referenced comparator architecture immune to process variation.
Does the MXD1815XR29+T require an external pullup resistor on the RESET pin?
No, the MXD1815XR29+T includes an internal 5.5kΩ pullup resistor connected to VCC, enabling direct interface with bidirectional μP reset pins (e.g., Motorola 68HC11) without external components. This feature is confirmed in the Pin Descriptions section and Electrical Characteristics table under "Internal Pullup Resistor, Open-Drain" - eliminating BOM cost and PCB area typically needed for discrete pullup solutions.
What is the minimum VCC voltage at which the MXD1815XR29+T guarantees valid RESET output logic states?
The MXD1815XR29+T guarantees correct 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 or capacitor discharge phases. Below +1.0V, output validity is not guaranteed - a key differentiator from competitors whose reset outputs degrade near 1.5V.
How does the MXD1815XR29+T handle short-duration power supply transients?
The MXD1815XR29+T rejects negative-going VCC transients up to 100µs in duration when the overdrive (VTH – VCC) is 200mV, as shown in Figure MXD1810-13/15 toc05. This transient immunity prevents spurious resets in electrically noisy environments such as motor drives or switch-mode power supply proximity - a design feature validated across temperature and process corners per the datasheet's Typical Operating Characteristics.
Is the MXD1815XR29+T pin-compatible with other devices in the MXD181x family?
Yes, all MXD1810–MXD1813/MXD1815–MXD1818 devices share identical 3-pin SC70 and SOT23 footprints, including MXD1815XR29+T. Pin 1 is RESET, pin 2 is VCC, and pin 3 is GND across variants - enabling drop-in replacement within the same package type. However, output configuration (open-drain vs. push-pull) and manual reset capability differ, so functional compatibility must be verified per application requirements.
MXD1815XR29+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.88V
- 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
MXD1815XR29+T FAQ
1.How can I place an order for MXD1815XR29+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1815XR29+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 MXD1815XR29+T reliable?
The price and inventory of MXD1815XR29+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1815XR29+T is usually 5 days.
3.What payment methods are accepted for MXD1815XR29+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1815XR29+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1815XR29+T?
MXD1815XR29+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1815XR29+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 MXD1815XR29+T?
For technical support, including MXD1815XR29+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1815XR29+T requirements.
6.How does Aetrix verify that MXD1815XR29+T is sourced from the original manufacturer or authorized distributors?
All MXD1815XR29+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 MXD1815XR29+T meets industry standards.
7.What is the process for return or replacement of MXD1815XR29+T?
All MXD1815XR29+T units undergo pre-shipment inspection (PSI). If there is an issue with MXD1815XR29+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 MXD1815XR29+T part is unused and in its original packaging.
Return procedure for MXD1815XR29+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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