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Analog Devices Inc./Maxim Integrated MXD1815UR29+T
- Part No.:
- MXD1815UR29+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MXD1815UR29+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,498
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Product details
Overview
MXD1815UR29+T 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 2.88V reset threshold, 100ms minimum reset timeout, ±2.5% threshold accuracy over temperature, and 4μA supply current - enabling reliable power-on reset in portable battery-powered equipment.
For engineers reviewing the MXD1815UR29+T datasheet, MXD1815UR29+T pinout, MXD1815UR29+T application, or MXD1815UR29+T equivalent, key selection criteria include reset threshold tolerance, manual-reset debounce capability (not present in this variant), open-drain drive strength, VCC operating range down to +1V, and compatibility with bidirectional μP reset pins without external pullup.
Technical Context
The MXD1815UR29+T integrates a precision voltage comparator monitoring VCC against a trimmed 2.88V reference, coupled with a monostable timer that holds RESET asserted for ≥100ms after VCC rises above threshold. Its open-drain output includes an internal 5.5kΩ pullup resistor, eliminating external components while supporting bidirectional μP reset interfaces.
Unlike MXD1813/MXD1818 variants, MXD1815UR29+T lacks manual-reset debounce circuitry and push-button detect functionality. It operates across -40°C to +105°C and maintains valid RESET logic states down to VCC = +1V, with immunity to fast transients via built-in glitch rejection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.88V ±2.5% - ensures reliable reset assertion during brownout in 3.3V systems before critical logic fails |
| Reset Timeout Period | 100ms min - guarantees sufficient hold time for full μP initialization and clock stabilization |
| Supply Current | 4μA typical at +3.6V - enables multi-year operation in coin-cell–powered IoT sensors and wearables |
| VCC Operating Range | +1.0V to +5.5V - supports valid reset signaling even during deep brownout or partial power loss |
| Output Type | Open-drain, active-low - allows wired-OR configuration and direct interface with bidirectional μP reset pins |
| Internal Pullup | 5.5kΩ - eliminates need for external resistor when driving standard CMOS inputs |
| Temperature Range | -40°C to +105°C - qualified for industrial and automotive under-hood environments |
Pinout & Package
MXD1815UR29+T is housed in a 3-pin SOT23 package (U3-1 outline), footprint-compatible with industry-standard SC70-3 and offering space-constrained PCB layout flexibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Primary supply input and reset-threshold monitoring node; must be decoupled locally for transient immunity |
| 2 | RESET | Open-drain, active-low output; sinks up to 10mA when asserted; pulled high internally to VCC via 5.5kΩ |
| 3 | GND | Analog and digital ground reference; requires low-impedance connection to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.88V reset threshold | Factory-trimmed ±2.5% over -40°C to +105°C - eliminates calibration overhead in production test |
| No external components required | Integrated pullup and comparator eliminate discrete resistors/capacitors - reduces BOM count and board area by ≥3 parts |
| Low 4μA quiescent current | Enables always-on reset supervision in energy-harvesting and battery-backed systems without measurable drain |
| VCC = +1V reset validity | Guarantees deterministic logic state on RESET pin even during severe undervoltage - prevents metastability in downstream logic |
| Transient-immune comparator | Rejects VCC glitches <10µs wide at 200mV overdrive - avoids spurious resets in noisy power rails |
Applications
| Portable/Battery-Powered Equipment | Critical μP and μC Monitoring |
|---|---|
Use Scenario: Wearable health monitor powered by CR2032 coin cell with 3.3V LDO regulator. IC Role / Device Role / Timing Role: Supervises LDO output and asserts RESET until stable 3.3V is confirmed, then holds reset for ≥100ms before releasing μC. Use Value: Prevents firmware crash during cold-start; 4μA current extends battery life beyond 3 years in sleep mode. | Use Scenario: Industrial PLC controller requiring guaranteed boot integrity after AC mains interruption. IC Role / Device Role / Timing Role: Monitors 3.3V system rail; triggers hard reset if voltage sags below 2.88V during brownout, holding reset for full 100ms recovery window. Use Value: Eliminates need for external RC timing network; ±2.5% threshold ensures consistent trip point across temperature extremes. |
| Computers and Controllers | Intelligent Instruments |
Use Scenario: Embedded edge gateway with ARM Cortex-M7 MCU and dual-rail power (1.2V core, 3.3V I/O). IC Role / Device Role / Timing Role: Resets 3.3V I/O domain independently; open-drain output interfaces directly with bidirectional reset pin of MCU without pullup. Use Value: Internal 5.5kΩ pullup removes external component; SOT23 package fits tight layout constraints near MCU. | Use Scenario: Handheld multimeter with LCD, ADC, and flash memory, operating from two AA cells. IC Role / Device Role / Timing Role: Detects voltage drop as batteries deplete; asserts RESET before analog front-end or memory controller malfunctions. Use Value: 2.88V threshold aligns with end-of-life voltage of alkaline AAs; -40°C to +105°C rating covers field use in uncontrolled environments. |
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 | Same 2.88V threshold, 140ms min timeout, 3.5μA ICC, SOT23-3 package | Lacks internal pullup; requires external 100kΩ pullup for open-drain operation | Select when lower ICC (<4μA) is critical and external pullup is acceptable |
| TPS3808G125DBVR | 2.88V threshold, 200ms min timeout, 1.1μA ICC, but push-pull output (no internal pullup) | Push-pull output incompatible with wired-OR or bidirectional reset buses without level-shifting | Select only if system uses dedicated reset line and ultra-low ICC dominates design priority |
Compared with MAX809TRD29+T, MXD1815UR29+T saves one external component via integrated pullup; compared with TPS3808G125DBVR, it supports shared reset busses and legacy μP interfaces without redesigning the reset path.
Availability
MXD1815UR29+T is available at Aetrix Electronics and suitable for portable electronics, industrial controllers, and intelligent instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MXD1815UR29+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, and communications markets.
The MXD1815UR29+T belongs to the MXD1815–MXD1818 family of low-power μP reset supervisors targeting cost-sensitive, space-constrained 2.5V/3.0V/3.3V systems where minimal external components and guaranteed reset timing are essential.
FAQ
What is the exact reset threshold voltage of MXD1815UR29+T and how tightly is it specified?
The MXD1815UR29+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 specification ensures consistent brownout detection across environmental conditions without requiring system-level calibration. The value is laser-trimmed during production and documented in the Electrical Characteristics table of the official datasheet.
Does MXD1815UR29+T support manual reset via an external pushbutton?
No, MXD1815UR29+T does not include manual-reset debounce functionality. That feature is exclusive to the MXD1813 and MXD1818 variants. MXD1815UR29+T provides only power-supply monitoring and automatic reset assertion; external pushbutton reset would require additional circuitry such as a separate debounced switch interface.
What is the function of the internal pullup resistor in MXD1815UR29+T, and what is its nominal value?
The internal pullup resistor in MXD1815UR29+T connects the open-drain RESET pin to VCC and has a nominal value of 5.5kΩ (min 3.5kΩ, max 7.5kΩ). It ensures a defined logic-high state when RESET is not asserted, enabling direct connection to bidirectional μP reset pins - for example, Motorola 68HC11 - without requiring an external pullup resistor.
Can MXD1815UR29+T operate reliably when VCC drops below 2.0V?
Yes, MXD1815UR29+T is guaranteed to maintain valid RESET logic states down to VCC = +1.0V. Its internal comparator and output stage remain functional and deterministic even during deep brownout conditions, ensuring the reset signal remains asserted or deasserted as appropriate - a critical capability for fail-safe behavior in safety-critical embedded systems.
Is MXD1815UR29+T pin-compatible with other devices in the same family or industry standards?
MXD1815UR29+T uses the standard 3-pin SOT23-3 package (U3-1 outline) and shares identical pinout (VCC, RESET, GND) with all MXD1810–MXD1818 variants in SOT23 format. It is also pin-compatible with DS181x-series reset ICs, enabling drop-in replacement in existing layouts where the reset threshold and output configuration match system requirements.
MXD1815UR29+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- SOT-23-3
MXD1815UR29+T FAQ
1.How can I place an order for MXD1815UR29+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1815UR29+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 MXD1815UR29+T reliable?
The price and inventory of MXD1815UR29+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1815UR29+T is usually 5 days.
3.What payment methods are accepted for MXD1815UR29+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1815UR29+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1815UR29+T?
MXD1815UR29+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1815UR29+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 MXD1815UR29+T?
For technical support, including MXD1815UR29+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1815UR29+T requirements.
6.How does Aetrix verify that MXD1815UR29+T is sourced from the original manufacturer or authorized distributors?
All MXD1815UR29+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 MXD1815UR29+T meets industry standards.
7.What is the process for return or replacement of MXD1815UR29+T?
All MXD1815UR29+T units undergo pre-shipment inspection (PSI). If there is an issue with MXD1815UR29+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 MXD1815UR29+T part is unused and in its original packaging.
Return procedure for MXD1815UR29+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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