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Analog Devices Inc./Maxim Integrated MXD1816UR26+T
- Part No.:
- MXD1816UR26+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MXD1816UR26+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,822
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Product details
Overview
MXD1816UR26+T from Maxim Integrated is an 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% over temperature), maintains reset for ≥100ms after VCC recovery, draws only 4μA typical supply current, and integrates a 5.5kΩ internal pullup resistor - ideal for portable, battery-powered μP supervision.
For engineers reviewing the MXD1816UR26+T datasheet, MXD1816UR26+T pinout, MXD1816UR26+T application, or MXD1816UR26+T equivalent, key selection criteria include its factory-trimmed 2.55V reset threshold, SOT23-3 open-drain output with internal pullup, guaranteed operation down to VCC = +1V, and compatibility with bidirectional μP reset pins without external components.
Technical Context
This device implements a precision bandgap-based voltage comparator with hysteresis and a monostable timeout circuit. Its reset assertion is triggered solely by VCC falling below the 2.55V threshold, with no manual reset capability - distinguishing it from MXD1813/MXD1818 variants. The open-drain output enables wired-OR configurations and direct interfacing with bidirectional μP reset pins like those on Motorola 68HC11.
The internal 5.5kΩ pullup ensures defined logic-high state when RESET is inactive, while sink capability of 10mA at VOUT = 0.4V supports standard TTL/CMOS loads. Immunity to fast VCC transients is achieved via comparator design that ignores glitches shorter than ~1–2µs depending on overdrive magnitude.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.55V ±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 after VCC rise - guarantees sufficient hold time for μP initialization sequences |
| Supply Current | 4μA typical at +3.6V - enables multi-year battery life in portable equipment |
| Output Type | Open-drain, active-low - allows wired-OR reset buses and interface with bidirectional μP reset pins |
| Internal Pullup Resistor | 5.5kΩ nominal - eliminates need for external pullup in most applications |
| Operating Voltage Range | +1.2V to +5.5V - supports valid RESET assertion down to VCC = +1V for fail-safe behavior |
| VCC Transient Immunity | Rejects sub-2µs negative-going glitches - prevents spurious resets during noisy power events |
Pinout & Package
MXD1816UR26+T is housed in a 3-pin SOT23 package (U3-1 outline), measuring 2.9mm × 1.6mm × 1.1mm, RoHS-compliant and lead(Pb)-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RESET) | Open-drain active-low reset output | Sinks current when asserted (low); floats high via internal 5.5kΩ pullup when inactive - compatible with bidirectional μP reset inputs |
| 2 (VCC) | Power supply and reset threshold reference input | Monitors system supply directly; device operates from +1.2V to +5.5V and asserts reset if VCC drops below 2.55V |
| 3 (GND) | Ground reference | Return path for internal comparator and output stage; must be low-impedance to ensure accurate threshold detection |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrates precision voltage reference, comparator, timer, and 5.5kΩ pullup - reduces BOM count and PCB area |
| Factory-set 2.55V reset threshold | Eliminates trimming or calibration; ±2.5% accuracy maintained across full -40°C to +105°C range |
| Guaranteed operation to VCC = +1V | Ensures predictable reset state during deep brownout - critical for data integrity in battery-backed systems |
| Low 4μA supply current | Enables always-on supervision in energy-constrained devices such as wearables and IoT sensors |
| 3-pin SOT23 footprint | Compatible with automated assembly and space-constrained layouts; pinout matches industry-standard reset ICs |
Applications
| Industrial Controllers | Portable Medical Devices |
|---|---|
|
Use Scenario: Supervising ARM Cortex-M4-based PLC modules operating from 3.3V rails in factory-floor environments with EMI and thermal cycling. IC Role / Device Role / Timing Role: Monitors VCC and asserts active-low RESET to halt processor execution during undervoltage, holding reset for ≥100ms after recovery to ensure clean boot. Use Value: Prevents corrupted firmware execution during line sags; 2.55V threshold aligns precisely with 3.3V system brownout margin, avoiding false triggers. |
Use Scenario: Power sequencing and fault monitoring in handheld glucose meters powered by single-cell Li-ion batteries (2.7V–4.2V). IC Role / Device Role / Timing Role: Detects battery voltage decay below 2.55V and initiates controlled shutdown via μP reset, preserving calibration data before cutoff. Use Value: 4μA quiescent current extends battery life; guaranteed operation down to VCC = +1V ensures deterministic reset even during final discharge phase. |
| Network Edge Routers | Smart Energy Meters |
|
Use Scenario: Reset supervision for dual-core MIPS processors in compact broadband gateways using 3.3V I/O and 1.2V core supplies. IC Role / Device Role / Timing Role: Provides active-low open-drain RESET signal tied to processor's bidirectional reset pin, enabling both hardware and software-initiated reset coordination. Use Value: Internal 5.5kΩ pullup eliminates external component; SOT23-3 footprint saves board space in thermally dense router PCBs. |
Use Scenario: Ensuring reliable startup and brownout recovery in ANSI C12.22-compliant electricity meters with isolated 3.3V logic rails. IC Role / Device Role / Timing Role: Asserts RESET during AC line interruptions or capacitor discharge events, maintaining reset until stable 3.3V rail is restored for ≥100ms. Use Value: ±2.5% threshold accuracy over temperature avoids premature resets in outdoor meter enclosures exposed to -40°C to +85°C ambient swings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3+T | 2.93V reset threshold, push-pull output, no internal pullup | Requires external pullup for wired-OR; less suitable for bidirectional μP reset pins | Select when higher reset threshold is needed and open-drain functionality is not required |
| TPS3808G125DBVR | 1.25V threshold, adjustable via external resistor, 350ms timeout, higher 8μA ICC | Supports custom thresholds but adds BOM complexity and consumes more current | Select when precise 1.25V monitoring or programmable timeout is mandatory |
Compared with MXD1816UR26+T, MAX809TRD3+T offers push-pull simplicity but lacks integrated pullup for bidirectional interfaces, while TPS3808G125DBVR provides flexibility at the cost of higher current and external component dependency - MXD1816UR26+T delivers optimal balance of fixed 2.55V accuracy, ultra-low power, and open-drain readiness in minimal footprint.
Availability
MXD1816UR26+T is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, network edge routers, and smart energy meters requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MXD1816UR26+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 demanding industrial, computing, and communications applications.
MXD1816UR26+T belongs to the MXD181x family of low-power μP reset supervisors - engineered specifically for reliable, component-free power monitoring in space- and energy-constrained embedded systems.
FAQ
What is the exact reset threshold voltage of MXD1816UR26+T and how stable is it over temperature?
The MXD1816UR26+T has a factory-trimmed reset threshold of 2.55V with ±2.5% accuracy guaranteed over the full -40°C to +105°C operating range. This stability is achieved through precision bandgap reference design and on-die trimming, ensuring consistent brownout detection across environmental extremes without external calibration.
Does MXD1816UR26+T support manual reset functionality via the RESET pin?
No, MXD1816UR26+T does not include manual reset detection. Unlike MXD1813/MXD1818 variants, it responds only to VCC-supply monitoring. Its RESET pin is strictly an open-drain output - pulling it low externally will not trigger a reset pulse or initiate debounced timing.
Can MXD1816UR26+T be used with microprocessors that have bidirectional reset pins?
Yes, MXD1816UR26+T is explicitly designed for this use case. Its open-drain, active-low RESET output interfaces directly with bidirectional μP reset pins (e.g., Motorola 68HC11) without external components - the internal 5.5kΩ pullup ensures proper high-state definition while allowing the μP to drive the line low when needed.
What is the maximum sink current capability of the RESET output in MXD1816UR26+T?
The RESET output of MXD1816UR26+T can sink up to 10mA while maintaining VOUT ≤ 0.4V at VCC ≥ 2.7V. This drives standard TTL/CMOS inputs reliably and supports multiple loads in wired-OR configurations - verified per Electrical Characteristics table under IOL parameter.
Is MXD1816UR26+T specified to operate down to VCC = 0V, and what happens to RESET output near minimum supply?
MXD1816UR26+T is guaranteed functional down to VCC = +1V, and RESET remains valid in that range. Below +1V, the open-drain output loses sinking capability and the internal pullup dominates, causing RESET to drift toward high-impedance - it is not recommended for applications requiring asserted RESET at VCC < +1V.
MXD1816UR26+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:
- 2.55V
- 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:
- SOT-23-3
MXD1816UR26+T FAQ
1.How can I place an order for MXD1816UR26+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1816UR26+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 MXD1816UR26+T reliable?
The price and inventory of MXD1816UR26+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1816UR26+T is usually 5 days.
3.What payment methods are accepted for MXD1816UR26+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1816UR26+T transactions.
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4.How is shipping managed for MXD1816UR26+T?
MXD1816UR26+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1816UR26+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 MXD1816UR26+T?
For technical support, including MXD1816UR26+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1816UR26+T requirements.
6.How does Aetrix verify that MXD1816UR26+T is sourced from the original manufacturer or authorized distributors?
All MXD1816UR26+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 MXD1816UR26+T meets industry standards.
7.What is the process for return or replacement of MXD1816UR26+T?
All MXD1816UR26+T units undergo pre-shipment inspection (PSI). If there is an issue with MXD1816UR26+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 MXD1816UR26+T part is unused and in its original packaging.
Return procedure for MXD1816UR26+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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