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Analog Devices Inc./Maxim Integrated MAX6865UK24D4L+T
- Part No.:
- MAX6865UK24D4L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK24D4L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,581
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Product details
Overview
The MAX6865UK24D4L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, combining voltage monitoring (2.4V reset threshold), manual reset input, and watchdog timer with 209s typical timeout. It asserts an active-high push-pull RESET signal during VCC brownout, MR assertion, or watchdog expiration, and guarantees valid reset down to VCC = +1.1V. Used in battery-powered medical monitors and portable instrumentation requiring ultra-low quiescent current.
For engineers reviewing the MAX6865UK24D4L+T datasheet, MAX6865UK24D4L+T pinout, MAX6865UK24D4L+T application, or MAX6865UK24D4L+T equivalent, key selection criteria include its 170nA typical supply current, factory-trimmed 2.4V reset threshold, 1200ms minimum reset timeout, 209s watchdog period, and compatibility with noisy low-voltage systems operating down to 1.2V.
Technical Context
This device implements a precision bandgap-based voltage monitor with ±2.5% threshold accuracy over -40°C to +85°C, coupled with a digital watchdog timer that clears on any WDI edge and expires if WDI remains static beyond 209s (typ). The internal reset timeout generator provides fixed 1200ms (D4) delay after VCC recovery or MR release.
The MAX6865UK24D4L+T features active-high push-pull RESET output referenced to VCC, internally pulled-up MR input (10kΩ), and WDI input tolerant of 150ns pulses. Its BiCMOS process enables guaranteed operation at VCC as low as 1.2V while maintaining 170nA supply current at 2.5V/25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.400V ±2.5% - factory-trimmed for precise brownout detection at nominal 2.4V rail |
| Supply Current | 170nA (typ) at 2.5V/25°C - enables multi-year battery life in always-on portable devices |
| Reset Timeout | 1200ms min - ensures full µP initialization and peripheral stabilization before release |
| Watchdog Timeout | 209s (typ), L-suffix - long-duration supervision for infrequently updated firmware or slow state machines |
| VCC Operating Range | 1.2V to 5.5V - supports single-cell Li-ion, 1.8V/2.5V/3.3V logic, and legacy 5V systems |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup and drives directly into CMOS inputs |
| Guaranteed Reset Validity | Down to VCC = +1.1V - ensures deterministic reset assertion even during deep brownout |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount. Compact 2.9mm × 1.6mm footprint with 0.95mm height, optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output; sinks/source up to 1.2mA; referenced to VCC |
| 2 | GND | Ground reference for all internal circuitry; must be connected to system ground plane |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (10kΩ); accepts CMOS levels |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); clears timer on transition; immune to <150ns glitches |
| 5 | VCC | Supply voltage input and monitored rail; requires 0.1µF bypass capacitor to GND for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in coin-cell–powered devices |
| Watchdog immunity | Clears on any WDI edge - prevents false timeouts during normal software polling or I/O toggling |
| VCC transient rejection | Immune to ≤40µs transients at 100mV overdrive - suppresses noise-induced spurious resets |
| No external components | Self-contained supervision - no RC timing networks, pullups, or external reset generators required |
| Guaranteed low-VCC operation | Valid RESET assertion down to VCC = +1.1V - ensures fail-safe behavior during deep undervoltage |
Applications
| Glucose Monitors | Patient Vital Sign Loggers |
|---|---|
Use Scenario: Continuous subcutaneous glucose sensing with Bluetooth LE transmission every 5 minutes. IC Role / Device Role / Timing Role: Supervises 1.8V MCU and analog front-end; asserts RESET if VCC drops below 2.4V or firmware hangs (WDI un-toggled >209s). Use Value: Prevents corrupted sensor readings or missed transmissions by forcing controlled reboot before data loss occurs. |
Use Scenario: Wearable ECG patch recording heart rate and SpO₂ for 72-hour clinical studies. IC Role / Device Role / Timing Role: Monitors 2.5V power rail and watches main processor; triggers 1200ms reset on brownout or software lockup. Use Value: Ensures uninterrupted 3-day logging by recovering from intermittent power dips or firmware faults without user intervention. |
| Portable Gas Detectors | Handheld Barcode Scanners |
Use Scenario: Intrinsically safe industrial gas detector powered by AA batteries with 24-month shelf life. IC Role / Device Role / Timing Role: Provides brownout protection and watchdog supervision for ARM Cortex-M0 host; operates down to 1.2V. Use Value: Eliminates false alarms caused by transient supply noise while guaranteeing reset validity during battery depletion. |
Use Scenario: Ruggedized warehouse scanner using 3.3V logic and laser diode driver, subjected to ESD and cable discharge events. IC Role / Device Role / Timing Role: Resets MCU on VCC sag or firmware crash; WDI fed by periodic timer interrupt to detect stalled decode engine. Use Value: Recovers from laser driver lockup or memory corruption without requiring physical reset button press. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK24D4L+T | No active-high RESET - offers active-low open-drain or push-pull only | Requires external pullup for open-drain; incompatible with direct-drive CMOS inputs needing high-true reset | Select MAX6865UK24D4L+T when active-high push-pull RESET is required to simplify interface and reduce BOM count. |
| TPS3838K24DBVR | Higher 4.5µA supply current; no watchdog timer; 2.4V threshold with 0.5% tighter tolerance | Suitable only for basic voltage monitoring - cannot supervise firmware execution or detect code hangs | Choose MAX6865UK24D4L+T when both brownout protection and watchdog supervision are mandatory for safety-critical operation. |
Compared with MAX6864UK24D4L+T and TPS3838K24DBVR, the MAX6865UK24D4L+T uniquely delivers ultra-low 170nA current, integrated 209s watchdog, and active-high push-pull RESET in one 5-pin SOT23 - enabling simpler, longer-life, and more robust supervision in portable medical and industrial equipment.
Availability
MAX6865UK24D4L+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign loggers, portable gas detectors, handheld barcode scanners, and other battery-powered embedded systems requiring stable component supply across extended product lifecycles.
Supply support for MAX6865UK24D4L+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 and mixed-signal ICs for power, sensing, connectivity, and security applications in industrial, medical, and communications markets.
The MAX6854–MAX6869 family was engineered specifically for nanopower microprocessor supervision in space- and energy-constrained portable electronics, emphasizing ultra-low ICC, wide VCC range, and integrated watchdog functionality.
FAQ
What is the exact reset threshold voltage of the MAX6865UK24D4L+T?
The MAX6865UK24D4L+T has a factory-trimmed reset threshold of 2.400V with ±2.5% tolerance over -40°C to +85°C, as defined by the "24" suffix in its part number per Maxim's Threshold Suffix Guide. This value is guaranteed by design and tested during production screening.
Does the MAX6865UK24D4L+T require external components to operate?
No, the MAX6865UK24D4L+T operates autonomously with no external timing components. A 0.1µF ceramic bypass capacitor from VCC to GND is recommended for noise immunity, but no resistors, capacitors, or pullups are needed for basic supervision or watchdog functionality.
What is the function of the WDI pin on the MAX6865UK24D4L+T?
The WDI (Watchdog Input) pin on the MAX6865UK24D4L+T monitors microprocessor activity. If WDI remains static (high or low) for longer than the 209s typical watchdog timeout, the device asserts RESET. Any rising or falling edge on WDI clears the timer, allowing flexible software-driven supervision.
Can the MAX6865UK24D4L+T supervise a 1.8V microcontroller supply rail?
Yes, the MAX6865UK24D4L+T operates and monitors VCC from 1.2V to 5.5V. Its 2.4V reset threshold is appropriate for supervising 2.5V or 3.3V rails; for 1.8V systems, select a variant with lower threshold (e.g., MAX6865UK18D4L+T), as 2.4V exceeds 1.8V and would not trigger.
How does the MAX6865UK24D4L+T ensure reliable reset during power-down?
The MAX6865UK24D4L+T guarantees valid RESET assertion down to VCC = +1.1V, ensuring deterministic behavior during deep brownout. Its active-high push-pull output maintains defined logic levels without external components, preventing floating states that could cause erratic µP behavior.
MAX6865UK24D4L+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.4V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 1.2s Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK24D4L+T FAQ
1.How can I place an order for MAX6865UK24D4L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK24D4L+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 MAX6865UK24D4L+T reliable?
The price and inventory of MAX6865UK24D4L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK24D4L+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK24D4L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK24D4L+T transactions.
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4.How is shipping managed for MAX6865UK24D4L+T?
MAX6865UK24D4L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK24D4L+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 MAX6865UK24D4L+T?
For technical support, including MAX6865UK24D4L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK24D4L+T requirements.
6.How does Aetrix verify that MAX6865UK24D4L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK24D4L+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 MAX6865UK24D4L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK24D4L+T?
All MAX6865UK24D4L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK24D4L+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 MAX6865UK24D4L+T part is unused and in its original packaging.
Return procedure for MAX6865UK24D4L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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