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Analog Devices Inc./Maxim Integrated MAX6865UK44D1L+T
- Part No.:
- MAX6865UK44D1L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK44D1L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,896
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Product details
Overview
The MAX6865UK44D1L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 4.266V reset threshold (suffix "44"), 10ms minimum reset timeout (D1), and 209s typical watchdog timeout (L). It monitors VCC, responds to manual reset (MR), and triggers reset on watchdog expiration - ideal for battery-powered glucose monitors requiring reliable brownout protection and software fault recovery.
For engineers reviewing the MAX6865UK44D1L+T datasheet, MAX6865UK44D1L+T pinout, MAX6865UK44D1L+T application, or MAX6865UK44D1L+T equivalent, this device delivers validated low-voltage reset assertion down to VCC = +1.1V, immunity to sub-40µs VCC transients, and guaranteed timing behavior across –40°C to +85°C - critical for portable medical and wearables design.
Technical Context
The MAX6865UK44D1L+T integrates a precision voltage monitor with ±2.5% threshold accuracy, a 209s watchdog timer that clears on any WDI edge, and a 10ms reset timeout generator. Its MR input includes internal 10kΩ pullup and 200ns glitch rejection, enabling robust manual reset without external components.
This variant belongs to the MAX6864–MAX6869 series with active-low push-pull RESET output, dedicated WDI pin, and no CT pin - distinguishing it from pin-selectable timeout variants (e.g., MAX6861–MAX6863) and non-watchdog parts (e.g., MAX6854–MAX6856).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at VCC = 1.8V - enables multi-year operation on coin-cell batteries |
| Reset Threshold Voltage | 4.266V (min 4.193V, max 4.408V) - factory-trimmed for precise 3.3V/5V rail monitoring |
| Reset Timeout Period | 10ms minimum (D1 option) - ensures µP initialization completes before release |
| Watchdog Timeout | 209s typical (L suffix) - supports long idle cycles in low-power sensor nodes |
| Operating Voltage Range | 1.2V to 5.5V - valid reset assertion guaranteed down to VCC = 1.1V |
| Output Type | Active-low push-pull RESET - eliminates need for external pullup resistor |
| Package | 5-pin SOT23 - footprint-compatible with TPS3836/TPS3837/TPS3838 |
Pinout & Package
Package: 5-pin SOT23 (lead-free, +T suffix), 2.9mm × 1.6mm × 1.1mm body, 0.95mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; sinks 50µA at VCC ≥ 1.1V with VOL ≤ 0.3V |
| 2 | GND | Ground reference for all internal circuits and reset timing |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; 1µs min pulse width |
| 4 | WDI | Watchdog input; detects rising/falling edges; clears timer on transition; 150ns min pulse width |
| 5 | VCC | Supply voltage input and monitored rail; requires 0.1µF bypass capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in coin-cell applications |
| Reset Valid to 1.1V | Guaranteed RESET assertion integrity even as VCC collapses below 1.2V |
| Watchdog Edge Sensitivity | Detects 150ns WDI pulses - supports high-frequency software heartbeat signaling |
| Transient Immunity | Immune to VCC glitches ≤40µs at 100mV overdrive - prevents spurious resets in noisy environments |
| No External Components | Internal MR pullup, precision threshold, and timing eliminate capacitors/resistors |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
|
Use Scenario: Continuous glucose sensing with Bluetooth LE transmission during intermittent sleep mode. IC Role / Device Role / Timing Role: Supervises 3.3V system rail and validates µP boot sequence after wake-up; asserts reset if firmware hangs during BLE reconnection. Use Value: Prevents undetected sensor calibration drift by forcing full restart on watchdog timeout, leveraging 209s window to accommodate extended low-power intervals. |
Use Scenario: Portable ECG recorder with dual-battery backup and auto-shutdown on low charge. IC Role / Device Role / Timing Role: Monitors main 5V rail and triggers hardware reset if VCC drops below 4.266V during battery switchover. Use Value: Ensures deterministic state recovery using 10ms reset timeout - faster than typical µP power-on reset requirements. |
| Wearable Fitness Trackers | Industrial Handheld Scanners |
|
Use Scenario: Accelerometer-based activity detection with motion-triggered wake-up and firmware self-test. IC Role / Device Role / Timing Role: Provides manual reset via button press (MR) and watchdog supervision of motion-interrupt service routine execution. Use Value: Eliminates need for RC reset network while maintaining 170nA quiescent draw - extends 200mAh coin-cell life beyond 3 years. |
Use Scenario: Rugged barcode scanner operating in warehouse environments with 12V-to-3.3V DC/DC noise coupling. IC Role / Device Role / Timing Role: Detects VCC brownouts caused by motor startup transients and asserts clean reset to ARM Cortex-M0. Use Value: Withstands 40µs VCC dips without false triggering - avoids field failures due to switching noise on shared power rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK44D1L+T | Same 4.266V threshold, 10ms timeout, 209s watchdog, but open-drain RESET output | Requires external pullup resistor; less suitable for direct µP reset input without level-shifting | Select when interfacing to mixed-voltage systems where RESET must be pulled to a different rail |
| TPS3836K33DBVR | 3.3V fixed threshold, 200ms reset timeout, no watchdog, 1.6µA ICC | Lacks software fault recovery; higher current draw reduces battery life in ultra-low-power designs | Choose only for cost-sensitive, non-watchdog applications with stable 3.3V supply and no runtime code validation needs |
Compared with MAX6864UK44D1L+T and TPS3836K33DBVR, the MAX6865UK44D1L+T uniquely combines push-pull RESET, nanopower consumption, and long watchdog timeout - making it optimal for battery-critical medical and portable devices requiring both power efficiency and runtime reliability.
Availability
MAX6865UK44D1L+T is available at Aetrix Electronics and suitable for portable medical devices, wearable health monitors, and industrial handheld scanners requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6865UK44D1L+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, and interface applications in demanding environments.
The MAX6864–MAX6869 family targets ultra-low-power microprocessor supervision in battery-operated medical, portable, and IoT devices - emphasizing nanoscale current, wide VCC range, and integrated watchdog functionality.
FAQ
What is the exact reset threshold voltage of the MAX6865UK44D1L+T?
The MAX6865UK44D1L+T has a factory-trimmed reset threshold of 4.266V, with guaranteed tolerance of ±2.5% (4.193V to 4.408V) across –40°C to +85°C. This value corresponds to the "44" suffix per Maxim's Threshold Suffix Guide and is optimized for monitoring 3.3V or 5V rails with margin against ripple-induced false resets. The MAX6865UK44D1L+T maintains this accuracy without external calibration.
Does the MAX6865UK44D1L+T require an external pullup resistor on the RESET pin?
No. The MAX6865UK44D1L+T features an active-low push-pull RESET output, which actively drives low and high states without needing an external pullup. This simplifies PCB layout and reduces BOM count compared to open-drain variants like MAX6864UK44D1L+T. The MAX6865UK44D1L+T's VOH is guaranteed ≥0.8×VCC when sourcing 200µA, ensuring reliable logic-high assertion.
How does the watchdog timer in the MAX6865UK44D1L+T respond to software faults?
The MAX6865UK44D1L+T watchdog timer expires after 209s (typical, L suffix) if no rising or falling edge occurs on the WDI pin. Upon expiration, it asserts RESET for the 10ms timeout period (D1), forcing a full µP restart. The timer clears on every WDI transition - enabling robust software heartbeat implementation. The MAX6865UK44D1L+T detects pulses as short as 150ns, supporting high-frequency firmware polling.
Can the MAX6865UK44D1L+T operate reliably below 1.2V supply voltage?
Yes. The MAX6865UK44D1L+T guarantees valid RESET assertion down to VCC = +1.1V, with VOL ≤ 0.3V when sinking 50µA. While functional operation is specified from 1.2V to 5.5V, its ability to assert reset at 1.1V ensures fail-safe behavior during deep brownout conditions. This capability is explicitly characterized and tested - a key differentiator of the MAX6865UK44D1L+T versus higher-current supervisors.
What is the maximum VCC transient duration the MAX6865UK44D1L+T can ignore without asserting reset?
The MAX6865UK44D1L+T is immune to VCC transients ≤40µs in duration when the overdrive is 100mV above its 4.266V threshold - per the "Maximum VCC Transient Duration vs. Reset Threshold Overdrive" curve. This immunity prevents false resets caused by switching noise or load-dump events in portable equipment. The MAX6865UK44D1L+T achieves this via internal filtering and hysteresis (0.5% of VTH), not external components.
MAX6865UK44D1L+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:
- 4.375V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 10ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK44D1L+T FAQ
1.How can I place an order for MAX6865UK44D1L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK44D1L+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 MAX6865UK44D1L+T reliable?
The price and inventory of MAX6865UK44D1L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK44D1L+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK44D1L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK44D1L+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6865UK44D1L+T?
MAX6865UK44D1L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK44D1L+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 MAX6865UK44D1L+T?
For technical support, including MAX6865UK44D1L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK44D1L+T requirements.
6.How does Aetrix verify that MAX6865UK44D1L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK44D1L+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 MAX6865UK44D1L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK44D1L+T?
All MAX6865UK44D1L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK44D1L+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 MAX6865UK44D1L+T part is unused and in its original packaging.
Return procedure for MAX6865UK44D1L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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