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Analog Devices Inc./Maxim Integrated MXD1816UR22
- Part No.:
- MXD1816UR22
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MXD1816UR22.pdf
- Description:
- IC SUPERVISOR MICROPROCES RESET
- Quantity:
- Payment:
- Shipping:
Inventory:2,364
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Product details
Overview
MXD1816UR22 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 internal 5.5kΩ pullup resistor, 2.18V factory-set reset threshold (±2.5% over temperature), 100ms minimum reset timeout, and guaranteed operation down to VCC = +1.2V. It is used in portable battery-powered equipment to ensure reliable power-on reset and brownout protection.
For engineers reviewing the MXD1816UR22 datasheet, MXD1816UR22 pinout, MXD1816UR22 application, or MXD1816UR22 equivalent, key selection criteria include reset threshold accuracy, open-drain interface compatibility with bidirectional μP reset pins, manual-reset absence (vs. MXD1818), supply current of 4μA at +3.6V, and SOT23-3 package suitability for space-constrained designs.
Technical Context
The MXD1816UR22 implements a precision voltage-monitoring comparator with hysteresis to detect VCC drops below 2.18V, triggering an open-drain RESET assertion. Its internal timer guarantees ≥100ms reset pulse width after VCC recovery, independent of supply ramp rate.
Unlike MXD1813/MXD1818, it lacks manual-reset debounce circuitry and push-button detection logic. Its open-drain output interfaces directly with μPs like Motorola 68HC11 without external pullups, leveraging the integrated 5.5kΩ resistor for logic-high default state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.18V ±2.5% over -40°C to +105°C - ensures reliable brownout detection for 2.5V/3.0V/3.3V systems |
| Reset Timeout Period | 100ms (min) - guarantees sufficient μP initialization time after power recovery |
| Supply Current | 4μA at +3.6V - enables multi-year battery life in portable instrumentation |
| Operating Voltage Range | +1.2V to +5.5V - supports valid RESET assertion down to near-UVLO conditions |
| Output Type | Open-drain, active-low with 5.5kΩ internal pullup - eliminates need for external resistor when interfacing with bidirectional μP reset pins |
| Package | SOT23-3 - 2.92mm × 1.3mm footprint ideal for compact PCB layouts |
| Temperature Range | -40°C to +105°C - qualified for industrial and extended-temperature embedded applications |
Pinout & Package
MXD1816UR22 is housed in a 3-pin SOT23 package (U3-1 outline, land pattern 90-0179). Pin 1 is RESET (open-drain, active-low), Pin 2 is VCC (supply and threshold monitor input), and Pin 3 is GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Open-drain, active-low reset output; requires no external pullup due to internal 5.5kΩ resistor to VCC |
| 2 | VCC | Power supply input and reset-threshold monitoring node; operates from +1.2V to +5.5V |
| 3 | GND | Ground reference for comparator and output stage; must be low-impedance for accurate threshold sensing |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset threshold | 2.18V with ±2.5% tolerance over full temperature range - eliminates calibration overhead in production |
| No external components required | Integrated voltage reference, comparator, timer, and pullup resistor - reduces BOM count and layout area |
| Low quiescent current | 4μA at +3.6V - extends battery life in always-on portable devices such as handheld meters |
| Transient immunity | Rejects VCC glitches <1.5μs at 2.18V overdrive - prevents spurious resets during switching noise events |
| Wide operating voltage | Functional RESET assertion down to VCC = +1.2V - ensures deterministic behavior during deep brownouts |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered ECG or glucose meter requiring guaranteed reset on cold-start and low-battery brownout. IC Role / Device Role / Timing Role: Supervisory IC asserting active-low RESET to ARM Cortex-M0 microcontroller during VCC <2.18V and holding for ≥100ms post-recovery. Use Value: Prevents firmware execution errors by ensuring full μP initialization before code fetch, enabled by 4μA supply current and 2.18V threshold matched to Li-ion discharge curve. |
Use Scenario: DIN-rail mounted sensor interface module exposed to 24V supply transients and wide ambient temperatures. IC Role / Device Role / Timing Role: Reset supervisor monitoring isolated 3.3V logic rail, asserting open-drain RESET to STM32F4 microcontroller during line dips. Use Value: Guarantees system reliability across -40°C to +105°C via ±2.5% threshold accuracy and transient-immune comparator design. |
| Smart Energy Meters | Point-of-Sale Terminals |
Use Scenario: Revenue-grade electricity meter with dual-supply architecture (main + backup coin cell). IC Role / Device Role / Timing Role: Monitoring 3.3V microcontroller supply; open-drain RESET output tied to bidirectional μP reset pin without external components. Use Value: Eliminates external pullup resistor, reducing component count and improving long-term field reliability in sealed meter enclosures. |
Use Scenario: Retail terminal powered from USB or wall adapter, subject to hot-plug and cable disconnect events. IC Role / Device Role / Timing Role: Ensuring clean reset during adapter insertion/removal by detecting VCC drop below 2.18V and asserting ≥100ms RESET pulse. Use Value: Prevents corrupted EEPROM writes or display glitches during power transitions, leveraging fixed 100ms timeout and 2.18V threshold optimized for 3.3V rails. |
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 | 2.93V reset threshold, SOT23-3, 1.2μA supply current, no internal pullup - requires external resistor for open-drain use | Higher threshold unsuitable for 2.5V/3.3V brownout detection; lower current benefits ultra-low-power designs | Select when 2.93V threshold aligns with system VCC margin and external pullup is acceptable |
| TPS3808G01DBVR | Adjustable threshold (via external resistor divider), 1.8μA supply current, push-pull output - no internal pullup, different pinout | Requires external components and PCB redesign; suitable only where programmability justifies added complexity | Choose only if threshold flexibility is mandatory and SOT23-3 pin compatibility is not required |
Compared with MXD1816UR22, MAX809TRD3-T offers lower supply current but mismatches the 2.18V threshold needed for tight 3.3V brownout margins, while TPS3808G01DBVR sacrifices pin compatibility and adds bill-of-materials cost for adjustable threshold capability not required in fixed-voltage applications.
Availability
MXD1816UR22 is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, smart energy meters, and point-of-sale terminals requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MXD1816UR22 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 MXD1810–MXD1818 family was designed specifically for cost-sensitive, space-constrained microprocessor supervisory functions in battery-powered and industrial embedded systems, emphasizing low power, precision thresholds, and minimal external components.
FAQ
What is the exact reset threshold voltage of the MXD1816UR22?
The MXD1816UR22 has a factory-trimmed reset threshold of 2.18V, with guaranteed accuracy 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_ _ R22" row and applies specifically to the MXD1816UR22 variant within the MXD1815–MXD1818 subfamily for 2.5V/3.0V/3.3V systems.
Does the MXD1816UR22 support manual reset functionality?
No, the MXD1816UR22 does not include manual reset or push-button debounce circuitry. That feature is exclusive to the MXD1813 and MXD1818 variants. The MXD1816UR22 provides only power-supply monitoring and automatic reset assertion - its RESET pin is strictly an open-drain output with no input detection capability.
What package type and pin configuration does the MXD1816UR22 use?
The MXD1816UR22 uses a 3-pin SOT23 package (orderable suffix "U"), with Pin 1 as open-drain RESET, Pin 2 as VCC, and Pin 3 as GND. This matches the U3-1 outline and land pattern 90-0179, and is pin-compatible with industry-standard 3-pin SOT23 reset supervisors including DS181x series devices.
Can the MXD1816UR22 operate reliably at VCC = +1.2V?
Yes, the MXD1816UR22 is fully specified to operate down to VCC = +1.2V (minimum), with guaranteed RESET/RESET validity across this range. Its internal comparator and timer remain functional, enabling deterministic reset behavior during deep brownout conditions - a key requirement validated in the Absolute Maximum Ratings and Electrical Characteristics sections.
Is an external pullup resistor required when using the MXD1816UR22's RESET output?
No, an external pullup resistor is not required. The MXD1816UR22 integrates a 5.5kΩ internal pullup resistor between RESET and VCC, enabling direct connection to bidirectional microcontroller reset pins (e.g., Motorola 68HC11) without additional components - a feature explicitly documented in the Pin Descriptions and Applications Information sections.
MXD1816UR22 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:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.18V
- 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
MXD1816UR22 FAQ
1.How can I place an order for MXD1816UR22 through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1816UR22 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 MXD1816UR22 reliable?
The price and inventory of MXD1816UR22 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1816UR22 is usually 5 days.
3.What payment methods are accepted for MXD1816UR22?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1816UR22 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1816UR22?
MXD1816UR22 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1816UR22 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 MXD1816UR22?
For technical support, including MXD1816UR22 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1816UR22 requirements.
6.How does Aetrix verify that MXD1816UR22 is sourced from the original manufacturer or authorized distributors?
All MXD1816UR22 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 MXD1816UR22 meets industry standards.
7.What is the process for return or replacement of MXD1816UR22?
All MXD1816UR22 units undergo pre-shipment inspection (PSI). If there is an issue with MXD1816UR22, 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 MXD1816UR22 part is unused and in its original packaging.
Return procedure for MXD1816UR22:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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