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Analog Devices Inc./Maxim Integrated MXD1818UR26
- Part No.:
- MXD1818UR26
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MXD1818UR26.pdf
- Description:
- IC SUPERVISOR MICROPROCES RESET
- Quantity:
- Payment:
- Shipping:
Inventory:2,081
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Product details
Overview
MXD1818UR26 from Maxim Integrated is an open-drain, active-low microprocessor reset supervisor IC with manual-reset debouncing capability, designed for +2.5V/+3.0V/+3.3V systems. It asserts reset when VCC falls below 2.55V (±2.5% over temperature), maintains reset for ≥100ms after VCC recovery, and detects external push-button resets held ≥1.5μs - used in portable battery-powered equipment, set-top boxes, and intelligent instruments.
For engineers reviewing the MXD1818UR26 datasheet, MXD1818UR26 pinout, MXD1818UR26 application, or MXD1818UR26 equivalent, key selection criteria include its factory-set 2.55V threshold, 4μA supply current, -40°C to +105°C operation, SOT23-3 package, and integrated 5.5kΩ internal pullup resistor enabling direct interface with bidirectional μP reset pins without external components.
Technical Context
The MXD1818UR26 implements a precision bandgap-based voltage comparator monitoring VCC against a trimmed 2.55V threshold, with hysteresis and transient immunity to suppress false resets from sub-µs VCC glitches. Its internal timer guarantees ≥100ms reset timeout on both power-up and manual reset release.
As part of the MXD1815–MXD1818 subfamily, it features open-drain RESET output with internal 5.5kΩ pullup and dedicated manual-reset input logic that debounces mechanical switch bounce and triggers a fixed 100ms reset pulse upon release - distinct from non-manual-reset variants like MXD1815/MXD1816.
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 rails |
| Supply Current | 4μA typical at +3.6V - enables multi-year battery life in portable applications |
| Reset Timeout | 100ms minimum after VCC rise or manual reset release - meets μP power-up initialization requirements |
| Operating Voltage Range | 1.2V to 5.5V - guarantees valid RESET output down to VCC = +1V for system-level fault coverage |
| Manual Reset Detect | 1.5μs minimum low pulse on RESET pin - rejects switch bounce while enabling robust operator-initiated reset |
| Output Type | Open-drain active-low with 5.5kΩ internal pullup - eliminates need for external pullup and supports bidirectional μP reset pins |
| Package | SOT23-3 - 2.92mm × 1.3mm footprint compatible with high-density PCB layouts |
Pinout & Package
MXD1818UR26 is housed in a 3-pin SOT23 package (U3-1 outline, land pattern 90-0179), with pin 1 = RESET (open-drain active-low), pin 2 = VCC (supply and threshold monitor input), pin 3 = GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RESET) | Open-drain active-low reset output with manual-reset input | Drives low during VCC brownout or external button press; internal 5.5kΩ pullup holds high otherwise; accepts debounced manual reset trigger |
| 2 (VCC) | Power supply input and reset-threshold reference source | Supplies internal circuitry and serves as analog input to voltage comparator; operates down to +1.2V with guaranteed logic state |
| 3 (GND) | Ground reference | Common return path for VCC supply current and RESET sink current; required for accurate threshold monitoring |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.55V threshold | ±2.5% accuracy over full temperature range eliminates calibration and reduces BOM count |
| Integrated 5.5kΩ pullup resistor | Enables direct connection to μP reset pins without external components - saves board space and cost |
| Debounced manual-reset input | Rejects mechanical switch bounce and guarantees clean 100ms reset pulse on button release |
| 100ms fixed reset timeout | Meets JEDEC JESD84-B51 and common μP initialization timing requirements without external timing elements |
| VCC transient immunity | Suppresses false resets from negative-going transients ≤100ns at 200mV overdrive - improves system reliability |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered handheld ECG or glucose meters requiring fail-safe startup and user-triggered recalibration. IC Role / Device Role / Timing Role: MXD1818UR26 monitors main Li-ion rail (3.3V) and asserts reset on undervoltage or button press to force firmware reload and sensor reinitialization. Use Value: 4μA quiescent current extends battery life; 2.55V threshold matches nominal 3.3V rail dropout point; manual reset enables field recalibration without power cycle. |
Use Scenario: DIN-rail mounted programmable logic controller modules operating in harsh industrial environments with noisy 24V-to-3.3V DC-DC supplies. IC Role / Device Role / Timing Role: MXD1818UR26 supervises the 3.3V logic rail, detecting brownouts caused by load transients and providing debounced front-panel reset for maintenance personnel. Use Value: -40°C to +105°C rating ensures operation in uncontrolled cabinets; 100ms timeout prevents spurious resets during brief supply dips; open-drain output interfaces directly with isolated μP reset inputs. |
| Set-Top Box Power Management | Smart Home Hub Controllers |
Use Scenario: Consumer STB with dual-rail power (5V standby, 3.3V main) where cold boot and remote-initiated firmware update require deterministic reset sequencing. IC Role / Device Role / Timing Role: MXD1818UR26 monitors the 3.3V main rail and provides active-low reset signal to ARM Cortex-A53 SoC; manual reset pin connects to IR receiver GPIO for remote-triggered recovery. Use Value: Internal pullup eliminates external resistor; 2.55V threshold avoids false triggers during 3.3V rail soft-start; 100ms hold time satisfies SoC reset timing specs. |
Use Scenario: Wi-Fi/Zigbee hub with always-on BLE co-processor and intermittent main MCU, requiring low-power supervision and physical reset for OTA failure recovery. IC Role / Device Role / Timing Role: MXD1818UR26 supervises the 3.3V supply feeding the main application processor and provides debounced reset via tactile button to force bootloader entry after failed firmware update. Use Value: 4μA supply current minimizes standby drain; 1.5μs manual detect threshold ensures responsiveness without false triggers; SOT23-3 footprint fits compact 4-layer PCBs. |
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, no manual reset, push-pull output, same SOT23-3 package | Lacks debounced manual reset; requires external pullup for open-drain μP interfaces | Select when only power-supply monitoring is needed and board layout already includes pullup resistor |
| TPS3808G125DBVR | 1.25V threshold, adjustable delay via capacitor, 1.5μA supply current, SOT23-6 package | Higher pin count, requires external timing capacitor, lower threshold unsuitable for 3.3V systems | Select when ultra-low power (<2μA) and programmable timeout are critical, and PCB space allows SOT23-6 |
Compared with MXD1818UR26, MAX809TRD3-T offers simpler supervision but no manual reset capability, while TPS3808G125DBVR provides lower power and adjustable timing at the cost of added components and larger footprint - MXD1818UR26 uniquely balances factory-trimmed 2.55V accuracy, integrated pullup, debounced manual reset, and minimal 3-pin form factor for 3.3V portable designs.
Availability
MXD1818UR26 is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, and smart home hub controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MXD1818UR26 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.
MXD1818UR26 belongs to the MXD1815–MXD1818 family of low-power μP reset supervisors, engineered specifically for reliable power-on reset and manual recovery in space-constrained, battery-operated 2.5V/3.0V/3.3V systems.
FAQ
What is the exact reset threshold voltage of MXD1818UR26 and how stable is it over temperature?
The MXD1818UR26 has a factory-set reset threshold of 2.55V, with guaranteed accuracy of ±2.5% across the full operating temperature range of -40°C to +105°C. This value is confirmed in the Electrical Characteristics table under "MXD181_ _ R26" row, with min/typ/max values of 2.47V/2.55V/2.64V. The device uses laser-trimmed BiCMOS technology to maintain this stability without external calibration components.
Does MXD1818UR26 require an external pullup resistor on the RESET pin?
No, MXD1818UR26 does not require an external pullup resistor. It integrates a 5.5kΩ internal pullup resistor on the open-drain RESET pin, as specified in the Electrical Characteristics table under "Internal Pullup Resistor, Open-Drain" for MXD1813/MXD1818. This enables direct connection to bidirectional μP reset inputs (e.g., Motorola 68HC11) without additional components.
How does the manual reset function work on MXD1818UR26, and what is the minimum pulse width required?
The MXD1818UR26's manual reset function activates when the RESET pin is pulled low for ≥1.5μs, as stated in the Electrical Characteristics table under "Push-Button Detect to Reset (tPB)". Upon release, it asserts a clean 100ms minimum reset pulse (tPBRST), with internal debouncing eliminating mechanical switch bounce - confirmed in the Detailed Description and Functional Diagram sections.
What is the supply current consumption of MXD1818UR26 at 3.3V, and how does it impact battery life?
MXD1818UR26 draws 4μA typical supply current at +3.6V and VCC > VTH (no load), per the Electrical Characteristics table. At 3.3V, this remains within the 4–10μA range. In a coin-cell-powered device drawing 4μA continuously, MXD1818UR26 contributes negligibly to total system current - enabling multi-year operation in portable equipment such as medical monitors and smart sensors.
Is MXD1818UR26 pin-compatible with other devices in the MXD181x family, and which packages are supported?
Yes, MXD1818UR26 is pin-compatible with all members of the MXD1810–MXD1818 family in the same package variant. It is offered exclusively in the 3-pin SOT23 package (U3-1 outline), as confirmed in the Ordering Information table. Pin 1 = RESET, pin 2 = VCC, pin 3 = GND - identical pinout to MXD1815UR26, MXD1816UR26, and MXD1817UR26, enabling drop-in substitution where functional requirements align.
MXD1818UR26 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:
- Power Supply Monitor
- 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
MXD1818UR26 FAQ
1.How can I place an order for MXD1818UR26 through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1818UR26 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 MXD1818UR26 reliable?
The price and inventory of MXD1818UR26 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1818UR26 is usually 5 days.
3.What payment methods are accepted for MXD1818UR26?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1818UR26 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1818UR26?
MXD1818UR26 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1818UR26 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 MXD1818UR26?
For technical support, including MXD1818UR26 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1818UR26 requirements.
6.How does Aetrix verify that MXD1818UR26 is sourced from the original manufacturer or authorized distributors?
All MXD1818UR26 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 MXD1818UR26 meets industry standards.
7.What is the process for return or replacement of MXD1818UR26?
All MXD1818UR26 units undergo pre-shipment inspection (PSI). If there is an issue with MXD1818UR26, 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 MXD1818UR26 part is unused and in its original packaging.
Return procedure for MXD1818UR26:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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