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Analog Devices Inc./Maxim Integrated MXD1818UR23
- Part No.:
- MXD1818UR23
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MXD1818UR23.pdf
- Description:
- IC SUPERVISOR MICROPROCES RESET
- Quantity:
- Payment:
- Shipping:
Inventory:653
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Product details
Overview
MXD1818UR23 from Maxim Integrated is an open-drain, active-low microprocessor reset supervisor IC with debounced manual-reset capability, designed for +2.5V/+3.0V/+3.3V systems. It asserts reset when VCC falls below 2.31V (±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 requiring reliable power-on and brownout protection.
For engineers reviewing the MXD1818UR23 datasheet, MXD1818UR23 pinout, MXD1818UR23 application, or MXD1818UR23 equivalent, this page delivers verified circuit role, factory-trimmed threshold accuracy, manual-reset timing behavior, internal 5.5kΩ pullup, and SOT23-3 package compatibility - critical for μP reset validation, BOM replacement, and low-power embedded system design.
Technical Context
The MXD1818UR23 implements a precision bandgap-based voltage comparator with hysteresis to monitor VCC and trigger reset on undervoltage events. Its internal timer ensures a fixed 100ms minimum reset timeout after VCC rises above the 2.31V threshold, independent of temperature or supply variation.
It integrates debounced manual-reset detection logic that responds only to RESET pin low pulses ≥1.5μs, rejecting mechanical switch bounce while asserting reset for ≥100ms after release. The open-drain output includes a factory-trimmed 5.5kΩ internal pullup resistor to VCC, eliminating external components for bidirectional μP reset interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.31V ±2.5% over -40°C to +105°C - guarantees reliable reset activation across industrial temperature range without calibration. |
| Reset Timeout Period | 100ms minimum after VCC rise - ensures μP completes power stabilization before release from reset state. |
| Supply Current | 4μA typical at +3.6V - enables multi-year operation in coin-cell–powered portable devices. |
| Manual Reset Detect Width | 1.5μs minimum low pulse on RESET pin - rejects switch bounce while enabling fast user-initiated reset. |
| Operating Voltage Range | 1.2V to 5.5V - supports valid reset assertion down to near-dead-battery conditions (VCC ≥1.2V). |
| Output Type | Open-drain active-low with internal 5.5kΩ pullup - interfaces directly with bidirectional μP reset pins (e.g., Motorola 68HC11) without external resistor. |
| Package | SOT23-3 - industry-standard 3-pin footprint compatible with automated PCB assembly and space-constrained designs. |
Pinout & Package
MXD1818UR23 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 plating (designated by "+T" suffix). Thermal performance supports continuous operation at +105°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RESET) | Open-drain active-low reset output with manual-reset input | Drives low during VCC undervoltage or external manual trigger; accepts debounced push-button signal; internal 5.5kΩ pullup to VCC eliminates external component. |
| 2 (VCC) | Power supply and reset-threshold monitoring input | Supplies internal circuitry and serves as reference for comparator; valid operation guaranteed from 1.2V to 5.5V. |
| 3 (GND) | Ground reference | Common return path for internal comparator, timer, and output stage; must be low-impedance for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 2.31V reset threshold | Eliminates external resistor network and calibration effort; ±2.5% accuracy maintained over full -40°C to +105°C range. |
| Debounced manual-reset input | Rejects <1.5μs glitches from mechanical switches; triggers guaranteed 100ms reset pulse upon valid button press - no external RC filter required. |
| Internal 5.5kΩ pullup resistor | Enables direct connection to bidirectional μP reset pins (e.g., 68HC11); removes need for discrete pullup and saves board area. |
| 4μA typical supply current | Extends battery life in portable instrumentation and handheld controllers; supports always-on supervision without significant drain. |
| Transient-immune comparator | Rejects negative-going VCC glitches ≤100ns at 200mV overdrive - prevents spurious resets during digital switching noise. |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered ECG or glucose meter operating from single Li-ion cell with wide VCC swing during discharge. IC Role / Device Role / Timing Role: Supervises VCC to assert reset if voltage drops below 2.31V, preventing corrupted memory writes or erratic firmware execution during brownout. Use Value: Guarantees clean restart at 2.31V threshold with 100ms hold time, enabling safe shutdown and recovery without external components or software intervention. |
Use Scenario: DIN-rail mounted PLC module exposed to 24VDC supply fluctuations and EMI in factory environments. IC Role / Device Role / Timing Role: Provides hardware-level reset assertion during 24V rail sag or transient dropout, independent of firmware health. Use Value: Delivers deterministic 100ms reset pulse immune to sub-microsecond transients, ensuring μP reinitialization even under noisy industrial power conditions. |
| Set-Top Box Power Management | Smart Meter MCU Supervision |
Use Scenario: Consumer STB powered from AC/DC adapter with variable load-induced ripple and cold-start delays. IC Role / Device Role / Timing Role: Monitors 3.3V logic rail and initiates reset on slow-rising or collapsing VCC, synchronizing boot sequence with stable power. Use Value: Fixed 100ms timeout ensures sufficient time for LDOs and clock circuits to settle before releasing μP - avoids race conditions during power-up. |
Use Scenario: AMI smart meter using ultra-low-power MCU with backup supercapacitor maintaining RTC during main power loss. IC Role / Device Role / Timing Role: Detects main supply failure and asserts reset to force controlled save-to-EEPROM before backup power depletion. Use Value: Valid reset assertion down to VCC = 1.2V enables early warning before backup power exhaustion, preserving metering integrity and tamper logs. |
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 | Fixed 3.08V reset threshold; no manual-reset input; 140ms min timeout; SOT23-3 package | Lacks push-button debounce; suited for simple power-on reset only, not field-serviceable devices | Select when only basic VCC monitoring is needed and manual reset is handled externally. |
| TPS3808G125DBVR | Adjustable threshold via external resistor; 200ms min timeout; higher 8μA quiescent current; same SOT23-3 footprint | Requires external resistor network; better for custom threshold needs but increases BOM count and layout area | Choose when precise non-standard reset voltage (e.g., 2.45V) is required and extra component cost is acceptable. |
Compared with MXD1818UR23, MAX809TRD3-T offers simpler supervision but omits manual-reset functionality, while TPS3808G125DBVR provides flexibility at the cost of higher current and external component dependency - MXD1818UR23 uniquely balances factory-trimmed accuracy, integrated debounce, and ultra-low power in a 3-pin solution.
Availability
MXD1818UR23 is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, and smart meter MCU supervision requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MXD1818UR23 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 engineered to replace discrete reset circuits in space- and power-constrained μP systems, delivering precision voltage monitoring, manual-reset integration, and zero-external-component operation in miniature packages.
FAQ
What is the exact reset threshold voltage of the MXD1818UR23?
The MXD1818UR23 has a factory-trimmed reset threshold of 2.31V, with guaranteed accuracy of ±2.5% over the full operating temperature range of -40°C to +105°C. This value is confirmed in the Reset Threshold Table and Electrical Characteristics section of the official datasheet, and applies specifically to the "R23" suffix variant within the MXD1815–MXD1818 subfamily for 2.5V/3.0V/3.3V systems.
Does the MXD1818UR23 require an external pullup resistor on the RESET pin?
No, the MXD1818UR23 does not require an external pullup resistor. It integrates a factory-trimmed 5.5kΩ internal pullup resistor connected between the open-drain RESET pin and VCC. This enables direct interface with bidirectional μP reset inputs (e.g., Motorola 68HC11) without additional components, as verified in the Pin Descriptions and Applications Information sections of the datasheet.
How does the manual-reset function work on the MXD1818UR23?
The MXD1818UR23 detects manual reset by monitoring the RESET pin: when pulled low for ≥1.5μs, it triggers a debounced reset assertion lasting ≥100ms after the pin is released. This behavior is exclusive to MXD1813/MXD1818 variants and is validated in the Detailed Description and Figure 6 (Manual Reset Timing Diagram) of the datasheet.
What is the supply current consumption of the MXD1818UR23 at 3.3V?
At VCC = +3.6V and VCC > VTH with no load, the MXD1818UR23 draws 4μA typical and 10μA maximum supply current, as specified in the Electrical Characteristics table. This ultra-low quiescent current is measured across -40°C to +105°C and enables multi-year battery operation in portable equipment.
Is the MXD1818UR23 pin-compatible with other devices in the MXD181x family?
Yes, the MXD1818UR23 shares identical SOT23-3 pinout (RESET-VCC-GND) and footprint with all MXD1810–MXD1813/MXD1815–MXD1818 variants, including MXD1810UR46, MXD1815UR23, and MXD1813UR23. This pin compatibility is explicitly stated in the datasheet's "Pin Configurations" and "Ordering Information" sections, supporting drop-in replacement within the same threshold and output-type group.
MXD1818UR23 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:
- 2.31V
- Output:
- Open Drain, Bidirectional
- 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
MXD1818UR23 FAQ
1.How can I place an order for MXD1818UR23 through Aetrix?
Please submit a Request for Quotation (RFQ) for MXD1818UR23 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 MXD1818UR23 reliable?
The price and inventory of MXD1818UR23 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MXD1818UR23 is usually 5 days.
3.What payment methods are accepted for MXD1818UR23?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MXD1818UR23 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MXD1818UR23?
MXD1818UR23 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MXD1818UR23 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 MXD1818UR23?
For technical support, including MXD1818UR23 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MXD1818UR23 requirements.
6.How does Aetrix verify that MXD1818UR23 is sourced from the original manufacturer or authorized distributors?
All MXD1818UR23 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 MXD1818UR23 meets industry standards.
7.What is the process for return or replacement of MXD1818UR23?
All MXD1818UR23 units undergo pre-shipment inspection (PSI). If there is an issue with MXD1818UR23, 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 MXD1818UR23 part is unused and in its original packaging.
Return procedure for MXD1818UR23:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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