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Analog Devices Inc./Maxim Integrated MAX6865UK44D2L+T
- Part No.:
- MAX6865UK44D2L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK44D2L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,276
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Product details
Overview
The MAX6865UK44D2L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, a factory-trimmed 4.266V (min) / 4.375V (typ) / 4.484V (max) reset threshold, 40ms minimum reset timeout, and integrated watchdog timer with 209s typical timeout. It asserts an active-low push-pull RESET output upon VCC drop below threshold, MR assertion, or watchdog expiration - used for reliable power-on reset and fault recovery in battery-powered medical and portable electronics.
For engineers reviewing the MAX6865UK44D2L+T datasheet, MAX6865UK44D2L+T pinout, MAX6865UK44D2L+T application, or MAX6865UK44D2L+T equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior, and validated alternative options for low-power µP supervision in space-constrained, long-life systems.
Technical Context
The MAX6865UK44D2L+T implements a dual-trigger reset architecture: one path monitors VCC against a precision bandgap-based threshold (±2.5% tolerance), while a second path responds to manual reset (MR) or watchdog timer (WDI) expiration. Its internal watchdog clears on any WDI edge and times out after 209s (typ), with immunity to pulses <150ns.
Reset assertion is guaranteed valid down to VCC = +1.1V, and the push-pull RESET output drives low with ≤0.3V VOL at 1.2mA sink, enabling direct interface to 1.8V–5.5V µP reset inputs without external pullups. The device requires no external components and operates across –40°C to +85°C.
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) / 4.375V (typ) / 4.484V (max); factory-trimmed for precise 3.3V rail supervision |
| Reset Timeout Period | 40ms minimum (D2 option); ensures µP initialization completes before release |
| Watchdog Timeout | 209s typical (L suffix); supports long-loop firmware without spurious resets |
| RESET Output Type | Active-low push-pull; eliminates need for external pullup and guarantees logic-low state |
| VCC Validity Range | Operates down to VCC = +1.1V; maintains valid RESET assertion during deep brownout |
| MR Input Behavior | Internally pulled up to VCC via 10kΩ; accepts CMOS-level signals; 1µs minimum pulse width |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, 2.9mm × 1.6mm footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; sinks ≥1.2mA at VCC ≥ 2.38V; drives µP reset input directly |
| 2 | GND | Ground reference for all internal circuits; must connect to system ground plane |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC; initiates reset when pulled ≤0.3×VCC |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); clears internal timer on each transition; rejects <150ns glitches |
| 5 | VCC | Supply voltage input (1.2V–5.5V); monitored for reset generation; bypass with 0.1µF to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in glucose monitors |
| Guaranteed RESET validity to VCC = +1.1V | Ensures deterministic reset assertion even during severe brownout conditions |
| Watchdog immunity to short transients | Rejects VCC glitches <40µs at 100mV overdrive - prevents false resets in noisy environments |
| No external components required | Reduces BOM count and PCB area; eliminates calibration or timing resistor dependencies |
| Push-pull RESET output | Drives low to ≤0.3V at 1.2mA - compatible with 1.8V/2.5V/3.3V/5V µP reset inputs |
Applications
| Portable Medical Devices | Wearable Health Monitors |
|---|---|
|
Use Scenario: Continuous glucose monitoring (CGM) devices powered by CR2032 coin cells operating 24/7 for >3 years. IC Role / Device Role / Timing Role: Supervises 3.3V system rail and triggers hardware reset if firmware hangs or power sags below 4.27V. Use Value: Prevents undetected sensor data loss by enforcing full µP reboot within 40ms of fault detection. |
Use Scenario: ECG patch worn for 7-day ambulatory monitoring with intermittent Bluetooth transmission. IC Role / Device Role / Timing Role: Monitors VCC and watches WDI toggled by main MCU every 10–30s; asserts reset if transmission loop stalls. Use Value: 209s watchdog timeout matches longest expected idle interval, avoiding nuisance resets while catching deadlocks. |
| Industrial Handheld Terminals | Low-Power IoT Sensors |
|
Use Scenario: Ruggedized barcode scanners used in warehouses with frequent battery swaps and ESD exposure. IC Role / Device Role / Timing Role: Provides glitch-immune reset during hot-swap battery insertion and recovers from ESD-induced µP lockup. Use Value: Immunity to <40µs VCC transients prevents false resets during connector mating - improves field reliability. |
Use Scenario: Soil moisture sensor node powered by solar-charged Li-ion, sleeping >99% of time. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output and validates power integrity before waking MCU for measurement burst. Use Value: 170nA quiescent current minimizes sleep-mode drain - extends maintenance-free operation to 5+ years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK44D2L+T | No CT pin; identical reset threshold (4.375V typ), timeout (40ms), and watchdog (209s) | Lacks pin-selectable timeout - fixed D2 only; same footprint and pinout | Select when no timeout flexibility is needed and cost optimization is prioritized |
| TPS3837K33DBVR | 3.3V fixed threshold; 200ms min timeout; no watchdog; 1.6µA ICC; SOT23-5 | Suitable only for basic reset supervision without code-execution monitoring | Choose only if watchdog functionality is unnecessary and higher ICC is acceptable |
Compared with MAX6865UK44D2L+T, MAX6864UK44D2L+T offers identical supervision performance at lower unit cost but removes timeout configurability, while TPS3837K33DBVR lacks watchdog capability and draws 10× more current - making it unsuitable for long-life or firmware-safety-critical designs.
Availability
MAX6865UK44D2L+T is available at Aetrix Electronics and suitable for portable medical devices, wearable health monitors, and industrial handheld terminals requiring stable component supply with guaranteed long-term availability and lead-free compliance.
Supply support for MAX6865UK44D2L+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 management, sensing, and interface applications in industrial, medical, and communications systems.
The MAX6854–MAX6869 family was engineered specifically for ultra-low-power microprocessor supervision in battery-constrained devices, integrating voltage monitoring, manual reset, and watchdog timer in minimal 5-pin SOT23 packaging.
FAQ
What is the exact reset threshold voltage range for MAX6865UK44D2L+T?
The MAX6865UK44D2L+T has a factory-trimmed reset threshold of 4.266V (minimum), 4.375V (typical), and 4.484V (maximum) at TA = –40°C to +85°C, corresponding to the "44" suffix per Maxim's Threshold Suffix Guide. This range ensures robust supervision of nominal 3.3V rails with margin against noise and drift.
Does MAX6865UK44D2L+T support both manual reset and watchdog functionality?
Yes, MAX6865UK44D2L+T integrates both features: an active-low MR input (internally pulled up to VCC via 10kΩ) and a watchdog input (WDI) that triggers reset if inactive for >209s (typ). Both paths assert the same push-pull RESET output, providing dual-fault coverage for power and software failures.
What is the function of Pin 4 (WDI) on MAX6865UK44D2L+T?
Pin 4 on MAX6865UK44D2L+T is the Watchdog Input (WDI). It must be toggled (rising or falling edge) at least once per 209s (typ) to prevent watchdog timeout. The internal timer clears on each edge and expires only if WDI remains static - enabling firmware to signal liveness without precise timing constraints.
Can MAX6865UK44D2L+T operate reliably below 1.8V supply?
Yes, MAX6865UK44D2L+T is fully specified from VCC = 1.2V to 5.5V and guarantees RESET assertion validity down to VCC = +1.1V. At 1.2V, its supply current is 190nA (typ), and RESET output remains functional with VOL ≤0.3V at 50µA sink - supporting ultra-low-voltage microcontrollers.
Is MAX6865UK44D2L+T pin-compatible with other devices in the MAX68xx family?
MAX6865UK44D2L+T uses the standard 5-pin SOT23-5 pinout shared across MAX6864–MAX6869 variants. Pin 1 = RESET, Pin 2 = GND, Pin 3 = MR, Pin 4 = WDI, Pin 5 = VCC - matching MAX6864/MAX6866/MAX6867/MAX6869 exactly. No PCB redesign is needed when migrating between these watchdog-enabled versions.
MAX6865UK44D2L+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:
- 40ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK44D2L+T FAQ
1.How can I place an order for MAX6865UK44D2L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK44D2L+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 MAX6865UK44D2L+T reliable?
The price and inventory of MAX6865UK44D2L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK44D2L+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK44D2L+T?
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4.How is shipping managed for MAX6865UK44D2L+T?
MAX6865UK44D2L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK44D2L+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 MAX6865UK44D2L+T?
For technical support, including MAX6865UK44D2L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK44D2L+T requirements.
6.How does Aetrix verify that MAX6865UK44D2L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK44D2L+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 MAX6865UK44D2L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK44D2L+T?
All MAX6865UK44D2L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK44D2L+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 MAX6865UK44D2L+T part is unused and in its original packaging.
Return procedure for MAX6865UK44D2L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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