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Analog Devices Inc./Maxim Integrated MXD1818UR26-T
- Part No.:
- MXD1818UR26-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MXD1818UR26-T.pdf
- Description:
- IC SUPERVISOR MICROPROCES RESET
- Quantity:
- Payment:
- Shipping:
Inventory:1,139
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Product details
Overview
MXD1818UR26-T from Maxim Integrated is a low-power microprocessor reset supervisor IC with open-drain active-low RESET output, manual-reset debouncing, and factory-trimmed 2.55V reset threshold. It monitors +2.5V/+3.0V/+3.3V power supplies, asserts reset for ≥100ms after VCC recovery or external push-button release, and operates from -40°C to +105°C in SOT23-3 package. Used in portable battery-powered systems requiring reliable brownout protection.
For engineers reviewing the MXD1818UR26-T datasheet, MXD1818UR26-T pinout, MXD1818UR26-T application, or MXD1818UR26-T equivalent, key selection criteria include its 2.55V ±2.5% threshold accuracy, 4μA supply current, debounced manual-reset input (1.5μs minimum pulse), guaranteed RESET validity down to VCC = +1V, and internal 5.5kΩ pullup resistor.
Technical Context
The MXD1818UR26-T implements a precision bandgap-based voltage comparator with hysteresis to detect VCC drops below 2.55V, triggering an open-drain active-low RESET signal. Its internal timer enforces a fixed 100ms minimum reset timeout after VCC rises above threshold or after manual reset release.
It integrates debounced manual-reset detection: a logic-low on the RESET pin held ≥1.5μs initiates a new 100ms reset period, suppressing mechanical switch bounce. The device uses BiCMOS process, supports VCC from 1.0V to 5.5V, and maintains valid RESET output down to VCC = +1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.55V ±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 processor initialization time after power recovery |
| Supply Current | 4μA typical at +3.6V - enables ultra-low-power operation in battery-powered equipment |
| Manual-Reset Pulse Width | 1.5μs minimum - rejects switch bounce while enabling fast, reliable user-initiated reset |
| Operating Voltage Range | +1.0V to +5.5V - allows valid RESET assertion even during deep brownout conditions |
| Output Type | Open-drain active-low with internal 5.5kΩ pullup - interfaces directly with bidirectional μP reset pins without external components |
| Package | SOT23-3 - space-saving footprint compatible with high-density PCB layouts |
Pinout & Package
MXD1818UR26-T is housed in a 3-pin SOT23 package (outline U3-1), measuring 2.92mm × 1.3mm × 1.0mm, with gull-wing leads and RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Open-drain active-low reset output; pulled high internally via 5.5kΩ resistor to VCC; sinks ≥10mA when asserted |
| 2 | VCC | Power supply input and reset-threshold monitoring node; accepts 1.0V–5.5V; powers internal comparator and timer |
| 3 | GND | Analog and digital ground reference; must be connected to system ground plane for stable threshold accuracy |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 2.55V threshold | Eliminates external resistor networks and calibration, reducing BOM count and layout area |
| Debounced manual-reset input | Enables direct connection to mechanical pushbuttons without external RC filtering or firmware debounce logic |
| Internal 5.5kΩ pullup resistor | Removes need for external pullup, simplifying interface to bidirectional μP reset pins (e.g., Motorola 68HC11) |
| 4μA supply current | Extends battery life in portable instrumentation and handheld devices operating on coin cells or Li-ion |
| Guaranteed operation down to VCC = +1V | Ensures deterministic reset behavior during severe undervoltage events before system shutdown |
Applications
| Portable/Battery-Powered Equipment | Critical μP and μC Monitoring |
|---|---|
Use Scenario: Handheld test meters powered by single-cell Li-ion batteries experiencing voltage sag under load. IC Role / Device Role / Timing Role: Supervisory reset circuit detecting VCC drop below 2.55V and asserting active-low RESET for ≥100ms to force controlled μC reboot. Use Value: Prevents erratic firmware execution during brownout, ensuring measurement integrity and data retention across power cycles. | Use Scenario: Industrial PLC controller board where main CPU must not execute code until stable 3.3V rail is confirmed. IC Role / Device Role / Timing Role: Primary power-on reset generator with 100ms timeout, synchronized to 3.3V rail rise time and immune to <10μs transients. Use Value: Guarantees clean, glitch-free reset assertion independent of rail sequencing or noise, eliminating boot failures. |
| Intelligent Instruments | Set-Top Boxes |
Use Scenario: Digital multimeter with real-time clock and flash memory requiring safe power-down sequence. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors VCC for brownout reset and accepts manual reset via front-panel button with hardware debounce. Use Value: Enables user-triggered recalibration or error recovery without software intervention or external debounce circuitry. | Use Scenario: Consumer STB with HDMI interface that must avoid hot-plug glitches during power cycling. IC Role / Device Role / Timing Role: System-level reset coordinator asserting RESET to SoC and peripheral controllers simultaneously after stable 3.3V is achieved. Use Value: Ensures HDMI PHY, audio codec, and video decoder initialize in lockstep, preventing handshake timeouts or EDID corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD29+T | 2.93V reset threshold, same SOT23-3 package, no manual-reset feature | Lacks debounced push-button input; requires external circuitry for manual reset | Select when only power-supply monitoring is needed and manual reset is handled elsewhere |
| TPS3808G125DBVR | 1.25V threshold, adjustable via external resistor, 350nA quiescent current, no manual reset | Lower threshold and ultra-low IQ suit ultra-low-power sensor nodes; no hardware manual reset support | Choose for energy-harvesting or always-on IoT sensors where 2.55V threshold is inappropriate |
Compared with MXD1818UR26-T, MAX809TRD29+T offers higher threshold but omits manual-reset capability, while TPS3808G125DBVR delivers nanowatt operation at the cost of fixed-threshold simplicity and push-button integration - making MXD1818UR26-T optimal for cost-sensitive, manually resettable 2.5V–3.3V embedded systems.
Availability
MXD1818UR26-T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, intelligent instruments, set-top boxes, and critical μP and μC monitoring requiring stable component supply across industrial temperature range and long-term production continuity.
Supply support for MXD1818UR26-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 industrial, computing, and consumer applications.
The MXD1810–MXD1818 family targets cost-sensitive, space-constrained embedded systems requiring reliable, low-power reset supervision for 2.5V/3.0V/3.3V and 5V rails - emphasizing factory-trimmed accuracy, minimal external components, and robust transient immunity.
FAQ
What is the exact reset threshold voltage of the MXD1818UR26-T?
The MXD1818UR26-T has a factory-set reset threshold of 2.55V, with ±2.5% accuracy over the full operating temperature range (-40°C to +105°C). This value is specified in the Electrical Characteristics table under "Reset Threshold" for suffix R26, and is optimized for reliable monitoring of +2.5V, +3.0V, and +3.3V power supplies. The MXD1818UR26-T maintains this accuracy without external calibration.
Does the MXD1818UR26-T support manual reset, and how does it work?
Yes, the MXD1818UR26-T features debounced manual-reset detection on its RESET pin. When the RESET pin is pulled low for at least 1.5μs, the device asserts active-low RESET for a guaranteed minimum of 100ms after the pin is released. This hardware debounce eliminates the need for external RC filters or firmware timing loops, making the MXD1818UR26-T ideal for direct connection to mechanical pushbuttons in portable equipment.
What output configuration does the MXD1818UR26-T use, and what are its drive capabilities?
The MXD1818UR26-T uses an open-drain, active-low RESET output with an internal 5.5kΩ pullup resistor to VCC. It can sink at least 10mA when asserted (VOUT ≤ 0.4V at VCC ≥ 2.7V), supporting direct interface to bidirectional microcontroller reset pins. No external pullup is required, and the MXD1818UR26-T remains compatible with standard μP reset timing requirements.
Can the MXD1818UR26-T operate reliably at very low supply voltages?
Yes, the MXD1818UR26-T is guaranteed to assert and maintain a valid RESET signal down to VCC = +1.0V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. This ensures deterministic reset behavior during deep brownout conditions before system shutdown, a key requirement for data integrity in portable and battery-powered applications using the MXD1818UR26-T.
What package type and footprint does the MXD1818UR26-T use?
The MXD1818UR26-T is supplied in a 3-pin SOT23 package (package code U3-1, outline 21-0051), with gull-wing leads and RoHS-compliant lead-free finish. Its compact 2.92mm × 1.3mm footprint matches industry-standard SOT23-3 land patterns, enabling drop-in compatibility with existing layouts designed for similar supervisory ICs like the MAX809 series.
MXD1818UR26-T 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-T FAQ
1.How can I place an order for MXD1818UR26-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1818UR26-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 MXD1818UR26-T reliable?
The price and inventory of MXD1818UR26-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1818UR26-T is usually 5 days.
3.What payment methods are accepted for MXD1818UR26-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1818UR26-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1818UR26-T?
MXD1818UR26-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1818UR26-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 MXD1818UR26-T?
For technical support, including MXD1818UR26-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1818UR26-T requirements.
6.How does Aetrix verify that MXD1818UR26-T is sourced from the original manufacturer or authorized distributors?
All MXD1818UR26-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 MXD1818UR26-T meets industry standards.
7.What is the process for return or replacement of MXD1818UR26-T?
All MXD1818UR26-T units undergo pre-shipment inspection (PSI). If there is an issue with MXD1818UR26-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 MXD1818UR26-T part is unused and in its original packaging.
Return procedure for MXD1818UR26-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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