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Analog Devices Inc./Maxim Integrated MAX6865UK35D6L+T
- Part No.:
- MAX6865UK35D6L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK35D6L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,626
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Product details
Overview
The MAX6865UK35D6L+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 (WDI) functionality. It asserts an active-high push-pull RESET output when VCC drops below 3.413V (typ), MR is pulled low, or the watchdog expires after 209s (typ). Designed for ultra-low-power systems, it draws only 170nA (typ) supply current and guarantees valid reset down to VCC = 1.1V.
For engineers reviewing the MAX6865UK35D6L+T datasheet, MAX6865UK35D6L+T pinout, MAX6865UK35D6L+T application, or MAX6865UK35D6L+T equivalent, this device serves as a critical power-on reset and software fault recovery element in battery-constrained embedded systems where supply current, reset threshold accuracy, and watchdog timeout stability are design-critical parameters.
Technical Context
The MAX6865UK35D6L+T implements a precision bandgap-based voltage monitor with ±2.5% reset threshold tolerance over –40°C to +85°C, paired with a temperature-stable RC-based watchdog timer offering 209s typical timeout (L-suffix). Its internal 10kΩ MR pullup and glitch-immune MR input (200ns rejection) enable robust manual reset without external components.
This variant features an active-high push-pull RESET output referenced to VCC, eliminating need for external pullup resistors, and integrates a watchdog transition detector that clears on any WDI edge-ensuring reliable detection of software hangs even under low-frequency toggling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.413V (min), 3.500V (typ), 3.588V (max) - factory-trimmed for precise brownout detection at 3.3V rail |
| Supply Current | 170nA (typ) at VCC = 1.8V - enables multi-year operation in coin-cell-powered devices |
| Reset Timeout | 600ms (min), 900ms (typ), 1200ms (max) - ensures µP initialization completes before release |
| Watchdog Timeout | 95s (min), 209s (typ), 487s (max) - supports long-loop firmware execution without spurious resets |
| VCC Operating Range | 1.2V to 5.5V - compatible with 1.8V, 2.5V, 3.3V, and 5V logic domains |
| RESET Output Type | Active-high push-pull - drives high without external components; VOH ≥ 0.8×VCC at 500µA source |
| MR Input Logic | Active-low with 10kΩ internal pullup to VCC - simplifies switch interface; 1µs minimum pulse width |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount. Compact footprint (2.9mm × 1.6mm × 1.1mm) suitable for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output; transitions high during fault conditions and remains asserted for 600–1200ms after recovery |
| 2 | GND | Ground reference for all internal circuitry and reset timing; must be low-impedance connection |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC; initiates reset when driven ≤0.3×VCC |
| 4 | WDI | Watchdog input; rising or falling edge clears internal timer; timeout occurs if no edge within 95–487s |
| 5 | VCC | Main supply input monitored for reset assertion; bypass with 0.1µF capacitor to GND for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical enables >10-year battery life in glucose monitors and wearables |
| Guaranteed reset validity to VCC = 1.1V | Ensures deterministic reset behavior during deep brownout, preventing undefined µP states |
| Immunity to short VCC transients | Rejects ≤40µs glitches at 100mV overdrive - eliminates false resets in noisy power environments |
| No external components required | Integrates MR pullup, reset timer, watchdog oscillator, and voltage reference - reduces BOM count and PCB area |
| Watchdog edge-triggered clear | Resets timer on any WDI transition (not level), enabling flexible firmware heartbeat placement |
Applications
| Portable Medical Devices | Industrial Sensor Nodes |
|---|---|
|
Use Scenario: Continuous glucose monitoring patch operating from CR2032 coin cell for 12+ months. IC Role / Device Role / Timing Role: Supervises 3.3V rail and detects firmware lockups via periodic WDI toggling; asserts RESET to reboot MCU upon hang. Use Value: 170nA quiescent current extends battery life; 209s watchdog timeout accommodates deep-sleep cycles without false triggers. |
Use Scenario: Wireless temperature sensor node deployed in remote HVAC ducts with no maintenance access. IC Role / Device Role / Timing Role: Monitors 1.8V LDO output and validates µP startup sequence; provides fail-safe reset if bootloader fails. Use Value: Valid reset down to VCC = 1.1V ensures recovery from marginal supply conditions; ±2.5% threshold tolerance prevents premature resets during rail droop. |
| Wearable Fitness Trackers | Smart Metering Modules |
|
Use Scenario: Arm-band heart rate monitor using BLE SoC powered by rechargeable Li-ion cell. IC Role / Device Role / Timing Role: Generates power-on reset and watches main application firmware; MR pin used for user-initiated factory reset. Use Value: Active-high push-pull RESET eliminates external pullup resistor; 1µs MR pulse width allows direct GPIO control from low-power MCU. |
Use Scenario: Electricity meter with tamper-detection firmware requiring guaranteed boot integrity after power interruption. IC Role / Device Role / Timing Role: Supervises 3.3V system rail and enforces 900ms minimum reset hold time to ensure secure bootloader execution. Use Value: 600–1200ms configurable timeout meets IEC 62056 reset timing requirements; SOT23-5 package fits constrained meter PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK35D6S+T | Same package and pinout; watchdog timeout 3.3s (S-suffix) instead of 209s (L-suffix) | Better suited for fast-loop firmware where frequent WDI toggling is feasible | Select when shorter watchdog interval improves responsiveness to software faults |
| TPS3837K33DBVR | 3.3V fixed threshold; 200ms reset timeout; no watchdog; 1.6µA supply current | Lacks WDI functionality; higher ICC limits use in multi-year battery applications | Choose only if watchdog is unnecessary and cost is primary constraint |
Compared with MAX6864UK35D6S+T, the MAX6865UK35D6L+T provides longer watchdog coverage for infrequently updated firmware, while versus TPS3837K33DBVR, it delivers 10× lower supply current and integrated fault recovery-making it superior for energy-harvesting and medical wearable designs.
Availability
MAX6865UK35D6L+T is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor nodes, wearable fitness trackers, and smart metering modules requiring stable component supply across extended production lifecycles.
Supply support for MAX6865UK35D6L+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 MAX68xx family was designed specifically for nanopower microprocessor supervision in battery-critical systems, integrating voltage monitoring, manual reset, and watchdog functions into minimal-footprint packages without external components.
FAQ
What is the exact reset threshold voltage of the MAX6865UK35D6L+T?
The MAX6865UK35D6L+T has a factory-trimmed reset threshold of 3.413V (min), 3.500V (typ), and 3.588V (max), corresponding to the "35" suffix per Maxim's Threshold Suffix Guide. This 3.5V nominal threshold is optimized for reliable supervision of 3.3V rails with margin against noise and drift.
Does the MAX6865UK35D6L+T require external components for basic operation?
No. The MAX6865UK35D6L+T operates autonomously with no external components: it includes an internal 10kΩ pullup on MR, a precision voltage reference, RC-based watchdog oscillator, and push-pull RESET driver. Only a 0.1µF VCC bypass capacitor is recommended for noise immunity.
How does the watchdog timer in the MAX6865UK35D6L+T clear and timeout?
The MAX6865UK35D6L+T watchdog timer clears on any rising or falling edge at the WDI pin and times out if no edge occurs for longer than its specified period (95–487s, typ 209s). Timeout triggers an active-high RESET assertion for 600–1200ms, independent of VCC or MR state.
What is the supply current of the MAX6865UK35D6L+T across its operating voltage range?
The MAX6865UK35D6L+T draws 170nA (typ) at VCC = 1.8V, increasing to 210nA (typ) at VCC = 5.0V. This ultra-low, voltage-dependent current enables decade-scale operation in coin-cell applications and eliminates thermal concerns in sealed enclosures.
Can the MAX6865UK35D6L+T be used with a 1.8V microcontroller?
Yes. The MAX6865UK35D6L+T operates from 1.2V to 5.5V and guarantees valid RESET down to VCC = 1.1V. Its MR input accepts logic levels as low as 0.3×VCC, and its active-high push-pull RESET outputs VOH ≥ 0.8×VCC at 500µA - fully compatible with 1.8V µP I/O.
MAX6865UK35D6L+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:
- 3.5V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 600ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK35D6L+T FAQ
1.How can I place an order for MAX6865UK35D6L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK35D6L+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 MAX6865UK35D6L+T reliable?
The price and inventory of MAX6865UK35D6L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK35D6L+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK35D6L+T?
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Once your MAX6865UK35D6L+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 MAX6865UK35D6L+T?
For technical support, including MAX6865UK35D6L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK35D6L+T requirements.
6.How does Aetrix verify that MAX6865UK35D6L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK35D6L+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 MAX6865UK35D6L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK35D6L+T?
All MAX6865UK35D6L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK35D6L+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 MAX6865UK35D6L+T part is unused and in its original packaging.
Return procedure for MAX6865UK35D6L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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