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Analog Devices Inc./Maxim Integrated MXD1816UR22+T
- Part No.:
- MXD1816UR22+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MXD1816UR22+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,367
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Product details
Overview
MXD1816UR22+T from Maxim Integrated is an open-drain, active-low microprocessor reset supervisor IC designed for +2.5V/+3.0V/+3.3V digital systems. It monitors VCC supply voltage with a factory-trimmed 2.18V reset threshold (±2.5% over temperature), asserts reset for ≥100ms after VCC recovery, consumes only 4μA typical supply current, and includes an internal 5.5kΩ pullup resistor - enabling reliable power-on reset in portable battery-powered equipment.
For engineers reviewing the MXD1816UR22+T datasheet, MXD1816UR22+T pinout, MXD1816UR22+T application, or MXD1816UR22+T equivalent, key selection criteria include its 2.18V threshold accuracy, open-drain output compatibility with bidirectional μP reset pins (e.g., Motorola 68HC11), guaranteed RESET validity down to VCC = +1V, and immunity to sub-10μs VCC transients per threshold overdrive.
Technical Context
The MXD1816UR22+T implements a precision bandgap-based voltage comparator with hysteresis to detect VCC drops below 2.18V, coupled to a monolithic timer that enforces a minimum 100ms reset timeout period after VCC rises above threshold. Its open-drain RESET output interfaces directly with microcontrollers requiring external pullup or bidirectional reset control without added components.
No manual reset detection is included - unlike MXD1813/MXD1818 - and it lacks push-button debounce circuitry. The device operates across -40°C to +105°C and maintains functional reset assertion even as VCC declines to +1V, leveraging BiCMOS process technology for low leakage and stable threshold performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.18V ±2.5% over -40°C to +105°C - ensures accurate brownout detection for 2.5V/3.0V/3.3V systems |
| Reset Timeout Period | 100ms minimum - guarantees sufficient reset hold time for μP initialization sequences |
| Supply Current | 4μA typical at +3.6V - enables multi-year operation in coin-cell–powered portable devices |
| Output Type | Open-drain, active-low - supports wired-OR reset buses and bidirectional μP reset pins without external pullup |
| Internal Pullup Resistor | 5.5kΩ nominal - eliminates need for external resistor while maintaining logic-high state when reset inactive |
| VCC Operating Range | +1.2V to +5.5V - allows valid reset assertion during deep brownout conditions down to +1V |
| Transient Immunity | Rejects <10μs negative VCC glitches - prevents spurious resets in noisy power environments |
Pinout & Package
MXD1816UR22+T is housed in a 3-pin SOT23 package (U3-1 outline), measuring 2.92mm × 1.3mm × 1.0mm, suitable for high-density PCB layouts in space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SOT23) | VCC | Primary supply input and reset threshold monitoring node - must be connected directly to system VCC rail |
| 2 (SOT23) | RESET | Open-drain, active-low reset output - sinks current when asserted; pulled high via internal 5.5kΩ resistor when inactive |
| 3 (SOT23) | GND | Analog ground reference - requires low-impedance connection to system ground plane for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.18V reset threshold | Factory-trimmed ±2.5% accuracy over full temperature range ensures consistent brownout response across operating conditions |
| Open-drain RESET with internal pullup | 5.5kΩ on-chip resistor eliminates external component count and simplifies interface to bidirectional μP reset pins |
| 100ms fixed reset timeout | Monolithic timer guarantees minimum reset pulse width independent of external RC timing elements |
| Ultra-low 4μA supply current | Enables use in always-on, battery-backed applications where quiescent power is critical to runtime |
| VCC = +1V reset validity | Guaranteed correct logic state down to 1.2V supply - supports robust reset behavior during severe brownouts |
Applications
| Computers and Controllers | Intelligent Instruments |
|---|---|
Use Scenario: Power-up sequencing in embedded controllers managing motor drives or sensor fusion. IC Role / Device Role / Timing Role: Supervisory reset generator ensuring deterministic μP boot before peripheral initialization. Use Value: Prevents code execution errors during unstable VCC ramp-up by holding reset until 100ms after threshold crossing. | Use Scenario: Battery-powered handheld test meters requiring long shelf life and reliable first-power reset. IC Role / Device Role / Timing Role: Low-power reset monitor with 2.18V threshold optimized for 3.3V Li-ion–supplied instrumentation. Use Value: 4μA supply current extends battery life; internal pullup avoids BOM cost and layout area for external resistor. |
| Set-Top Boxes | Printers |
Use Scenario: Multi-rail power supply monitoring in consumer STBs with +3.3V core and +1.8V I/O domains. IC Role / Device Role / Timing Role: Dedicated reset supervisor for the main application processor, triggered by +3.3V rail collapse. Use Value: 2.18V threshold provides 30% margin below nominal 3.3V, rejecting transient dips while detecting true brownout. | Use Scenario: Reset coordination in multifunction printers with separate logic, memory, and motor power domains. IC Role / Device Role / Timing Role: Open-drain RESET output enables shared reset bus across multiple ASICs and FPGAs. Use Value: Wired-OR capability allows single reset signal to synchronize boot of all subsystems without level-shifting. |
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, same SOT23-3 package, 140μA supply current | Higher threshold suits +3.3V systems needing tighter margin; higher ICC limits ultra-low-power use | Select when 2.93V detection is required and 140μA ICC is acceptable |
| TPS3808G125DBVR | 1.25V threshold, adjustable via external resistor, 1.1μA ICC, SOT23-6 package | Requires external resistor network; lower ICC benefits energy harvesting; larger footprint | Select when programmable threshold and sub-μA ICC outweigh 3-pin simplicity |
Compared with MXD1816UR22+T, MAX809TRD3+T offers higher threshold and higher ICC, making it less suitable for battery-critical 2.5V systems; TPS3808G125DBVR provides ultra-low ICC and adjustability but adds complexity and pin count - MXD1816UR22+T balances precision, integration, and ultra-low power in a minimal 3-pin form factor.
Availability
MXD1816UR22+T is available at Aetrix Electronics and suitable for computers and controllers, intelligent instruments, and portable/battery-powered equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MXD1816UR22+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) is a semiconductor company specializing in analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MXD1810–MXD1818 family was designed specifically for low-power, high-accuracy microprocessor reset supervision in space-constrained, battery-sensitive systems - emphasizing factory-trimmed thresholds, minimal external components, and wide temperature operation.
FAQ
What is the exact reset threshold voltage of MXD1816UR22+T and how stable is it over temperature?
The MXD1816UR22+T has a factory-set reset threshold of 2.18V, with guaranteed accuracy of ±2.5% across the full operating temperature range of -40°C to +105°C. This stability is achieved through laser-trimming during production and BiCMOS process design, ensuring consistent brownout detection without calibration or external components. The MXD1816UR22+T maintains this specification under varying load and supply conditions as confirmed in the Electrical Characteristics table.
Does MXD1816UR22+T support manual reset functionality via the RESET pin?
No, MXD1816UR22+T does not include manual reset detection or debouncing circuitry. That feature is exclusive to the MXD1813 and MXD1818 variants. The RESET pin on MXD1816UR22+T serves only as an open-drain output - it is not an input and cannot be used to trigger reset externally. Attempting to drive the RESET pin low will not assert reset; only VCC falling below 2.18V initiates reset assertion in the MXD1816UR22+T.
What is the purpose of the internal 5.5kΩ pullup resistor in MXD1816UR22+T?
The internal 5.5kΩ pullup resistor in MXD1816UR22+T ensures the RESET pin defaults to a logic-high state when not actively driven low, eliminating the need for an external pullup component. This simplifies BOM and layout while enabling direct interfacing with microprocessors that have bidirectional reset pins (e.g., Motorola 68HC11). The resistor value is optimized to provide sufficient rise time and noise immunity without excessive current draw - a key enabler of the MXD1816UR22+T's component-free design.
Can MXD1816UR22+T operate reliably when VCC drops below 2.0V?
Yes, MXD1816UR22+T is guaranteed to maintain correct RESET logic state down to VCC = +1.2V (with full functionality specified from +1.2V to +5.5V), and its reset comparator remains active and valid down to +1.0V. This ensures deterministic reset behavior during deep brownout events common in battery-powered systems nearing end-of-life. Unlike many supervisors that fail or float near minimum VCC, the MXD1816UR22+T continues asserting reset correctly - a verified capability documented in the Absolute Maximum Ratings and Electrical Characteristics sections.
Is MXD1816UR22+T pin-compatible with other members of the MXD181x family?
Yes, MXD1816UR22+T shares identical 3-pin SOT23 pinout (VCC–RESET–GND) and footprint with all MXD1810–MXD1818 variants in U-suffix packages, including MXD1810URxx+T, MXD1811URxx+T, and MXD1815URxx+T. This allows drop-in replacement within the same threshold and output-type group - though functional substitution requires matching reset polarity (active-low open-drain), threshold voltage, and absence of manual reset features. The MXD1816UR22+T is not functionally interchangeable with push-pull or manual-reset variants without circuit review.
MXD1816UR22+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:
- Obsolete
- 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+T FAQ
1.How can I place an order for MXD1816UR22+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1816UR22+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 MXD1816UR22+T reliable?
The price and inventory of MXD1816UR22+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1816UR22+T is usually 5 days.
3.What payment methods are accepted for MXD1816UR22+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1816UR22+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1816UR22+T?
MXD1816UR22+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1816UR22+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 MXD1816UR22+T?
For technical support, including MXD1816UR22+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1816UR22+T requirements.
6.How does Aetrix verify that MXD1816UR22+T is sourced from the original manufacturer or authorized distributors?
All MXD1816UR22+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 MXD1816UR22+T meets industry standards.
7.What is the process for return or replacement of MXD1816UR22+T?
All MXD1816UR22+T units undergo pre-shipment inspection (PSI). If there is an issue with MXD1816UR22+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 MXD1816UR22+T part is unused and in its original packaging.
Return procedure for MXD1816UR22+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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