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Analog Devices Inc./Maxim Integrated MXD1816XR26
- Part No.:
- MXD1816XR26
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MXD1816XR26.pdf
- Description:
- IC SUPERVISOR MICROPROCES RESET
- Quantity:
- Payment:
- Shipping:
Inventory:2,235
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Product details
Overview
MXD1816XR26 from Maxim Integrated is a low-power, open-drain, active-low microprocessor reset IC designed for +2.5V/+3.0V/+3.3V digital systems. It monitors VCC and asserts RESET when supply voltage falls below 2.55V (±2.5% accuracy), holds reset for ≥100ms after VCC recovery, features an internal 5.5kΩ pullup resistor, and operates across –40°C to +105°C in SC70-3 packaging - ideal for portable equipment and critical μP supervision.
For engineers reviewing the MXD1816XR26 datasheet, MXD1816XR26 pinout, MXD1816XR26 application, or MXD1816XR26 equivalent, this page delivers verified circuit role, reset threshold tolerance, timeout stability over temperature, manual-reset compatibility constraints, and package-specific sourcing guidance - all confirmed from Maxim's official datasheet Rev 2 (11/2014).
Technical Context
The MXD1816XR26 implements a precision bandgap-based voltage comparator with hysteresis to detect VCC drops below its factory-trimmed 2.55V threshold. Its open-drain RESET output interfaces directly with bidirectional μP reset pins (e.g., Motorola 68HC11) without external pullups, and guarantees valid logic states down to VCC = +1.0V.
Unlike MXD1813/MXD1818 variants, MXD1816XR26 lacks manual-reset debounce circuitry and push-button detection - it responds only to VCC-supply monitoring. Its 4μA typical supply current and immunity to transients ≤2µs (at 2.55V overdrive) support battery-powered reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.55V ±2.5% - ensures reliable brownout detection for 2.5V/3.0V/3.3V systems without false triggers |
| Reset Timeout Period | 100ms minimum - guarantees sufficient processor initialization time after power recovery |
| Supply Current | 4μA typical at +3.6V - enables multi-year operation in coin-cell–powered portable devices |
| Operating Voltage Range | +1.0V to +5.5V - supports valid reset assertion even during deep brownout conditions |
| Output Type | Open-drain, active-low with 5.5kΩ internal pullup - eliminates need for external resistor in most μP interface designs |
| Temperature Range | –40°C to +105°C - qualified for industrial and extended-temperature embedded applications |
| VCC Transient Immunity | Rejects negative glitches <2µs at 2.55V overdrive - prevents spurious resets from switching noise |
Pinout & Package
MXD1816XR26 is housed in a 3-pin SC70 (X3-2) package - ultra-compact (1.25mm × 2.0mm × 0.9mm), surface-mount, RoHS-compliant, and optimized for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SC70) | RESET | Open-drain, active-low output; pulled high internally to VCC via 5.5kΩ resistor; sinks up to 10mA when asserted |
| 2 (SC70) | VCC | Main supply input and reset-threshold reference node; accepts 1.0V–5.5V; powers internal comparator and timer |
| 3 (SC70) | GND | Analog/digital ground reference; must be low-impedance connection to maintain threshold accuracy and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | Factory-trimmed 2.55V with ±2.5% tolerance over full –40°C to +105°C range - eliminates calibration overhead |
| No external components required | Integrated pullup, comparator, timer, and reference - reduces BOM count and layout area vs. discrete solutions |
| Low-power operation | 4μA typical ICC at +3.6V - extends battery life in always-on monitoring applications |
| VCC transient immunity | Immune to fast negative-going supply glitches <2µs duration - avoids false resets in noisy power environments |
| Valid reset down to VCC = +1.0V | Guaranteed RESET logic state integrity even during severe brownout - ensures deterministic μP behavior |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
|
Use Scenario: Supervising ARM Cortex-M4-based controllers in DIN-rail mounted programmable logic controllers exposed to wide ambient temperature swings and EMI-rich factory floors. IC Role / Device Role / Timing Role: Active-low reset supervisor ensuring clean boot-up after line voltage sags or hot-swap events; provides 100ms timeout aligned with firmware initialization sequence. Use Value: Prevents corrupted register states and firmware lockups by guaranteeing μP remains held in reset until stable 3.3V rail is fully established. |
Use Scenario: Power management in handheld ECG analyzers powered by single-cell Li-ion batteries with dynamic load profiles. IC Role / Device Role / Timing Role: Brownout detector that triggers reset before battery voltage drops below 2.55V - protecting flash memory writes and sensor ADC calibration. Use Value: Enables safe shutdown sequencing and preserves data integrity during gradual battery depletion without external voltage dividers or comparators. |
| Network-Attached Storage (NAS) Enclosures | Smart Energy Meters |
|
Use Scenario: Reset coordination across dual-core SoCs and SATA controller ICs in fanless NAS units operating continuously at elevated ambient temperatures. IC Role / Device Role / Timing Role: Single-point VCC monitor for 3.3V I/O rail; open-drain output wired-OR'd with other reset sources to ensure system-wide synchronization. Use Value: Eliminates need for external pullup while maintaining interoperability with bidirectional reset pins on storage controllers. |
Use Scenario: Tamper-resistant metering platforms requiring guaranteed reset during AC mains interruptions or capacitor discharge events. IC Role / Device Role / Timing Role: Primary brownout detector for 2.5V real-time clock and metrology ASIC supply; operates reliably down to 1.0V VCC to capture final energy readings. Use Value: Ensures accurate last-read timestamping and nonvolatile event logging even during rapid power collapse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD2T | 2.93V reset threshold, SOT23-3, 14μA ICC, no internal pullup - requires external 47kΩ pullup for open-drain use | Designed for +3.3V systems with tighter timing budgets; lacks VCC = +1V validity guarantee | Select when higher threshold margin is needed and board space allows external resistor placement |
| TPS3808G125DBVR | 1.25V threshold, adjustable via external resistor, 1.6μA ICC, push-pull output - no internal pullup, different pinout | Targets ultra-low-voltage microcontrollers (e.g., MSP430); not drop-in compatible due to pin function reassignment | Choose only for sub-2V supply monitoring where programmability outweighs footprint and layout change cost |
Compared with MXD1816XR26, MAX809TRD2T offers higher threshold but demands external biasing and lacks deep-brownout validity; TPS3808G125DBVR enables threshold tuning but sacrifices pin compatibility and adds design complexity - MXD1816XR26 delivers optimal balance of precision, integration, and industrial temperature resilience for fixed 2.55V supervision.
Availability
MXD1816XR26 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, network-attached storage enclosures, smart energy meters, and battery-backed real-time clock modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MXD1816XR26 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–MXD1818 family was engineered to replace discrete reset circuits in space-constrained, low-power μP systems - delivering factory-trimmed accuracy, minimal external components, and robust transient immunity in SC70/SOT23 footprints.
FAQ
What is the exact reset threshold voltage of MXD1816XR26, and how tightly is it specified?
The MXD1816XR26 has a factory-set reset threshold of 2.55V, with a 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, where min/typ/max are listed as 2.47V/2.55V/2.64V. The specification ensures reliable brownout detection without calibration in 2.5V/3.0V/3.3V systems.
Does MXD1816XR26 support manual reset functionality via the RESET pin?
No, MXD1816XR26 does not include manual-reset debounce circuitry. Unlike MXD1813/MXD1818 variants, it responds exclusively to VCC supply monitoring and lacks the 1.5µs push-button detect feature. Its RESET pin is strictly an open-drain output - pulling it low externally will not trigger a reset timeout; only VCC falling below 2.55V initiates assertion.
What package type and dimensions does MXD1816XR26 use, and is it RoHS-compliant?
MXD1816XR26 uses the SC70-3 (X3-2) package: 1.25mm × 2.0mm × 0.9mm body size with 0.65mm lead pitch. Per Maxim's Package Information section, devices ordered with "-T" suffix are leaded; "+T" denotes lead(Pb)-free/RoHS-compliant versions. The SC70 outline is documented under land pattern no. 90-0208 and conforms to JEDEC MO-203 standards.
Can MXD1816XR26 operate reliably when VCC drops below 2.0V?
Yes - MXD1816XR26 guarantees valid RESET/RESET logic states down to VCC = +1.0V, as explicitly stated in the General Description and Absolute Maximum Ratings. This capability ensures deterministic reset behavior during deep brownout conditions, unlike many competing supervisors that cease valid output below 1.8V or 2.0V.
Is an external pullup resistor required when using MXD1816XR26's open-drain RESET output?
No external pullup is required. MXD1816XR26 integrates a 5.5kΩ internal pullup resistor between RESET and VCC, as confirmed in the Electrical Characteristics table (RP = 3.5kΩ to 7.5kΩ for MXD1816) and Pin Descriptions. This enables direct interfacing with bidirectional μP reset pins (e.g., Motorola 68HC11) without additional components.
MXD1816XR26 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:
- 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:
- SC-70-3
MXD1816XR26 FAQ
1.How can I place an order for MXD1816XR26 through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1816XR26 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 MXD1816XR26 reliable?
The price and inventory of MXD1816XR26 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1816XR26 is usually 5 days.
3.What payment methods are accepted for MXD1816XR26?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1816XR26 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1816XR26?
MXD1816XR26 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1816XR26 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 MXD1816XR26?
For technical support, including MXD1816XR26 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1816XR26 requirements.
6.How does Aetrix verify that MXD1816XR26 is sourced from the original manufacturer or authorized distributors?
All MXD1816XR26 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 MXD1816XR26 meets industry standards.
7.What is the process for return or replacement of MXD1816XR26?
All MXD1816XR26 units undergo pre-shipment inspection (PSI). If there is an issue with MXD1816XR26, 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 MXD1816XR26 part is unused and in its original packaging.
Return procedure for MXD1816XR26:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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