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Analog Devices Inc./Maxim Integrated MAX6865UK25D3L+T
- Part No.:
- MAX6865UK25D3L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK25D3L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,056
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Product details
Overview
The MAX6865UK25D3L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, combining voltage monitoring, manual reset input (MR), and watchdog timer functionality. It asserts an active-low push-pull RESET output when VCC drops below its factory-trimmed 2.500V threshold, MR is pulled low, or the watchdog timer expires after 209s (typ). Designed for ultra-low-power systems, it draws only 170nA (typ) supply current and guarantees valid reset operation down to VCC = +1.1V - ideal for battery-powered glucose monitors and portable medical devices.
For engineers reviewing the MAX6865UK25D3L+T datasheet, MAX6865UK25D3L+T pinout, MAX6865UK25D3L+T application, or MAX6865UK25D3L+T equivalent, key selection criteria include its 2.5V reset threshold, 150ms minimum reset timeout (D3), 209s watchdog period (L suffix), push-pull active-high RESET output, and guaranteed operation at VCC ≥ 1.1V in -40°C to +85°C environments.
Technical Context
The MAX6865UK25D3L+T implements a precision bandgap-based voltage monitor with ±2.5% threshold accuracy over temperature, coupled with a digital watchdog timer that clears on any WDI edge (rising or falling) and triggers reset if WDI remains static beyond 209s (typ). Its internal 10kΩ MR pullup enables direct connection of momentary switches without external components.
Reset assertion is synchronized to VCC crossing the 2.500V threshold with 40µs typical delay (tRD), and deassertion is delayed by a fixed 150ms (min) timeout after VCC exceeds threshold and MR deasserts. The device operates across 1.2V–5.5V supply range and maintains functional reset validity down to VCC = 1.1V, supporting brownout detection in deeply undervolted states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.500V ±2.5% - factory-trimmed for precise brownout detection at nominal 2.5V rail |
| Supply Current | 170nA (typ) at VCC = 1.8V - enables multi-year battery life in always-on medical sensors |
| Reset Timeout | 150ms (min), D3 option - ensures µP initialization completes before release from reset |
| Watchdog Timeout | 209s (typ), L suffix - supports long-cycle firmware tasks without spurious resets |
| RESET Output Type | Push-pull active-high - drives high without external pullup; compatible with µP reset inputs requiring active-high assertion |
| VCC Operating Range | 1.2V to 5.5V - supports single-cell Li-ion, 2-cell alkaline, and 3.3V/5V logic rails |
| Valid Reset Down To | VCC = +1.1V - guarantees reliable reset assertion during deep brownout conditions |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, footprint-compatible with industry-standard 5-pin SOT23 supervisors.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives high during reset assertion; no external pullup required |
| 2 | GND | Ground reference - must be connected to system ground plane for stable threshold reference |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC (10kΩ); accepts CMOS logic or switch-to-ground |
| 4 | WDI | Watchdog input - edge-sensitive (150ns min pulse); clears watchdog timer on rising or falling transition |
| 5 | VCC | Supply voltage input - monitored for reset generation; bypass with 0.1µF capacitor to GND for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA (typ) enables >10-year battery life in coin-cell-powered patient monitors |
| Immunity to short VCC transients | Rejects ≤40µs glitches at 100mV overdrive - prevents false resets in noisy power environments |
| No external components required | Integrated MR pullup (10kΩ), precision voltage reference, and watchdog oscillator eliminate BOM cost and layout area |
| Guaranteed reset validity to VCC = +1.1V | Ensures deterministic reset behavior during deep undervoltage - critical for fail-safe medical shutdown |
| Watchdog edge-triggered clear | Resets timer on any WDI transition (not level), enabling robust software supervision without timing-critical pulses |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Monitors |
|---|---|
|
Use Scenario: Continuous glucose meters operating from CR2032 coin cells with intermittent sensor sampling and Bluetooth LE transmission. IC Role / Device Role / Timing Role: Supervises 2.5V analog front-end and BLE SoC power rails; asserts reset if VCC sags during RF burst or if firmware hangs during calibration. Use Value: 170nA quiescent current extends battery life beyond 2 years; 209s watchdog interval accommodates full sensor warm-up and data upload cycles without false trigger. |
Use Scenario: Portable ECG/SpO₂ monitors with dual-voltage domains (1.8V sensor interface, 3.3V display controller) and safety-critical firmware. IC Role / Device Role / Timing Role: Monitors main 2.5V system rail; provides manual reset via clinician button and watchdog supervision of real-time OS task scheduler. Use Value: 2.500V threshold matches common LDO output; 150ms reset timeout ensures complete ADC initialization before µP release; VCC = 1.1V reset validity covers worst-case brownout during defibrillation event. |
| Industrial Handheld Scanners | Low-Power IoT Edge Sensors |
|
Use Scenario: Rugged barcode scanners powered by rechargeable Li-ion, subject to mechanical shock-induced power interruptions. IC Role / Device Role / Timing Role: Detects VCC droop during motor activation or drop impact; uses MR input for user-initiated cold reboot; watchdog guards against bootloader lockup. Use Value: 40µs transient immunity prevents spurious resets during motor commutation noise; push-pull active-high RESET directly interfaces with ARM Cortex-M reset pin without level-shifting. |
Use Scenario: Wireless environmental sensors (temp/humidity/CO₂) deployed in remote locations, powered by solar-charged LiFePO₄ batteries. IC Role / Device Role / Timing Role: Supervises 2.5V MCU and radio supply; watchdog verifies periodic sensor readout and LoRaWAN transmission; MR enables field technician recovery. Use Value: D3 timeout (150ms min) aligns with typical MCU boot sequence; 209s watchdog allows multi-minute sleep intervals between transmissions while ensuring firmware liveness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK25D3S+T | Same 2.5V threshold, D3 timeout, but 3.3s watchdog (S suffix) instead of 209s (L) | Better suited for fast-recovery embedded control loops requiring sub-5s watchdog response | Select MAX6864UK25D3S+T when firmware tasks complete within seconds; MAX6865UK25D3L+T preferred for long-cycle telemetry or sensor calibration. |
| TPS3836K25DBVR | 2.5V threshold, 200ms reset timeout, no watchdog; 1.6µA supply current vs. 170nA | Lacks watchdog functionality; higher ICC limits battery lifetime in always-on designs | Choose TPS3836K25DBVR only if watchdog is unnecessary and board space allows larger SOT-23-6 package; MAX6865UK25D3L+T provides integrated watchdog at 1/10 the supply current. |
Compared with MAX6864UK25D3S+T and TPS3836K25DBVR, the MAX6865UK25D3L+T uniquely delivers 209s watchdog supervision with nanopower consumption and pin-identical SOT23-5 packaging - enabling longer firmware execution windows and multi-year battery operation where alternatives require design trade-offs in power, feature set, or footprint.
Availability
MAX6865UK25D3L+T is available at Aetrix Electronics and suitable for portable medical devices, industrial handheld scanners, low-power IoT edge sensors, and battery-backed instrumentation requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6865UK25D3L+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The MAX6865UK25D3L+T belongs to Maxim's nanopower µP supervisory family, designed specifically for ultra-low-power, safety-critical embedded systems where extended battery life, reliable brownout detection, and firmware supervision are mandatory.
FAQ
What is the exact reset threshold voltage of the MAX6865UK25D3L+T?
The MAX6865UK25D3L+T has a factory-trimmed reset threshold of +2.500V, with ±2.5% tolerance over the full -40°C to +85°C operating temperature range. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "25" corresponds to 2.500V nominal. The device guarantees valid reset assertion down to VCC = +1.1V, making it suitable for brownout detection in deeply undervolted systems.
Does the MAX6865UK25D3L+T provide a watchdog timer, and what is its timeout period?
Yes, the MAX6865UK25D3L+T includes a watchdog timer with a typical timeout period of 209 seconds, indicated by the "L" suffix in the part number. This long-interval watchdog is designed for firmware tasks requiring extended execution windows - such as sensor calibration, data logging, or wireless transmission cycles - without risking spurious resets. The timer clears on any rising or falling edge at the WDI pin, supporting robust software supervision.
What type of RESET output does the MAX6865UK25D3L+T feature, and how is it configured?
The MAX6865UK25D3L+T features a push-pull active-high RESET output (pin 1), meaning it drives high during reset assertion and returns low when released. Unlike open-drain variants, it requires no external pullup resistor. This configuration directly interfaces with microcontrollers expecting active-high reset signals, simplifying PCB layout and reducing component count compared to open-drain alternatives requiring external biasing.
What is the reset timeout period for the MAX6865UK25D3L+T, and how is it selected?
The MAX6865UK25D3L+T has a fixed minimum reset timeout period of 150ms, designated by the "D3" suffix in the part number. This value is factory-set and not user-configurable. The 150ms duration ensures sufficient time for power supply stabilization and microcontroller internal initialization before release from reset - a critical timing margin verified across voltage and temperature extremes per the datasheet's tRP specification.
How does the MAX6865UK25D3L+T handle supply voltage transients, and what is its immunity level?
The MAX6865UK25D3L+T is immune to short-duration VCC transients up to 40µs when the overdrive is 100mV - as shown in the "Maximum VCC Transient Duration vs. Reset Threshold Overdrive" graph (Figure MAX684 toc05). This transient rejection prevents false resets caused by switching noise, motor spikes, or connector bounce. Its architecture actively filters brief supply disturbances while maintaining precise threshold detection for sustained brownout conditions.
MAX6865UK25D3L+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:
- 2.5V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK25D3L+T FAQ
1.How can I place an order for MAX6865UK25D3L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK25D3L+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 MAX6865UK25D3L+T reliable?
The price and inventory of MAX6865UK25D3L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK25D3L+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK25D3L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK25D3L+T transactions.
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4.How is shipping managed for MAX6865UK25D3L+T?
MAX6865UK25D3L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK25D3L+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 MAX6865UK25D3L+T?
For technical support, including MAX6865UK25D3L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK25D3L+T requirements.
6.How does Aetrix verify that MAX6865UK25D3L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK25D3L+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 MAX6865UK25D3L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK25D3L+T?
All MAX6865UK25D3L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK25D3L+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 MAX6865UK25D3L+T part is unused and in its original packaging.
Return procedure for MAX6865UK25D3L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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