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Analog Devices Inc./Maxim Integrated MAX6865UK17D3L+T
- Part No.:
- MAX6865UK17D3L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK17D3L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,061
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Product details
Overview
The MAX6865UK17D3L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, combining voltage monitoring (1.665V factory-trimmed reset threshold), manual reset input (MR), and watchdog timer (209s typical timeout) with ultra-low 170nA typical supply current. It asserts an active-high push-pull RESET signal during VCC brownout, MR assertion, or watchdog timeout, and holds reset for 150ms minimum after recovery - ideal for battery-powered glucose monitors and portable medical devices.
For engineers reviewing the MAX6865UK17D3L+T datasheet, MAX6865UK17D3L+T pinout, MAX6865UK17D3L+T application, or MAX6865UK17D3L+T equivalent, key selection criteria include its L-suffix 209s watchdog timeout, D3 150ms reset timeout, 17-suffix 1.665V threshold, push-pull active-high output, and guaranteed reset validity down to VCC = +1.1V.
Technical Context
This device implements a dual-trigger reset architecture: one path monitors VCC against a precision bandgap-based 1.665V threshold with 2.5% tolerance, while a second path detects WDI inactivity exceeding 209s (typ). The internal watchdog timer clears on any WDI edge, MR assertion, or RESET assertion - preventing false timeouts during system initialization or debug pauses.
The push-pull active-high RESET output is referenced to VCC and delivers VOH ≥ 0.8×VCC at ISOURCE = 500µA (VCC ≥ 2.38V), ensuring reliable µP reset signaling across 1.2V–5.5V supply range. Its 170nA supply current remains stable over -40°C to +85°C, with no external components required beyond standard 0.1µF VCC bypass.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.665V (factory-trimmed, ±2.5%), enabling precise brownout detection for 1.8V logic rails |
| Watchdog Timeout | 209s typical (L-suffix), suitable for long-cycle firmware tasks without frequent WDI toggling |
| Reset Timeout | 150ms minimum (D3 suffix), sufficient to hold µP in reset until power stabilizes post-brownout |
| Supply Current | 170nA typical at +25°C, extending battery life in multi-year portable medical devices |
| RESET Output Type | Push-pull active-high, eliminating need for external pullup and simplifying interface to µP reset inputs |
| VCC Operating Range | 1.2V to 5.5V, supporting operation down to 1.2V while maintaining valid RESET down to 1.1V |
| MR Input Pullup | Internal 10kΩ to VCC, enabling direct connection of momentary switch to GND without external resistor |
Pinout & Package
MAX6865UK17D3L+T uses a 5-pin SOT23-5 package (2.9mm × 1.6mm × 1.1mm), with pins arranged as follows (top view): Pin 1 = RESET (active-high push-pull), Pin 2 = GND, Pin 3 = MR (active-low manual reset), Pin 4 = WDI (watchdog input), Pin 5 = VCC (supply voltage input).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output; drives high during reset condition, referenced to VCC, no external pullup needed |
| 2 | GND | Ground reference for all internal circuits; must connect to system ground plane with low-impedance path |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; accepts CMOS logic levels or open-drain signals |
| 4 | WDI | Watchdog input; resets internal timer on rising or falling edge; immune to pulses <150ns; requires no external conditioning |
| 5 | VCC | Supply input for reset monitoring and internal circuitry; bypass with 0.1µF capacitor to GND for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical enables >10-year battery life in coin-cell-powered patient monitors |
| Guaranteed RESET validity | Valid down to VCC = +1.1V ensures deterministic reset behavior during deep brownout |
| Watchdog immunity to noise | 200ns MR glitch rejection and 150ns WDI pulse detection prevent spurious timeouts |
| No external components | Integrated 10kΩ MR pullup, precision voltage reference, and timing capacitors eliminate BOM cost and layout area |
| Transient immunity | Immune to VCC transients ≤40µs at 100mV overdrive, reducing false resets in noisy environments |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Monitors |
|---|---|
|
Use Scenario: Continuous glucose meters powered by CR2032 coin cells operating in variable-temperature clinical environments. IC Role / Device Role / Timing Role: Supervises 1.8V MCU supply, triggers reset on battery sag below 1.665V, and enforces 209s watchdog timeout if firmware hangs during sensor calibration. Use Value: Prevents undetected firmware lockup during critical glucose measurement cycles, ensuring alarm integrity and regulatory compliance (IEC 62304 Class B). |
Use Scenario: Portable ECG/SpO₂ monitors used in home care with intermittent charging and long standby periods. IC Role / Device Role / Timing Role: Monitors 3.3V system rail, asserts active-high RESET to ARM Cortex-M0+ during brownout, and validates reset signal down to 1.1V VCC. Use Value: Eliminates need for external reset supervisor IC and pullup resistor, reducing PCB area by 2.5mm² and BOM count by two passive components. |
| Industrial Handheld Scanners | Low-Power Wireless Sensors |
|
Use Scenario: Rugged barcode scanners deployed in warehouses with wide temperature swings (-20°C to +60°C) and ESD-prone environments. IC Role / Device Role / Timing Role: Provides MR-initiated reset via front-panel button and monitors 2.8V Li-ion supply with 150ms timeout to ensure clean MCU boot after cold start. Use Value: Internal 10kΩ MR pullup removes need for external debouncing RC network, cutting assembly cost and improving field reliability. |
Use Scenario: Battery-operated LoRaWAN soil moisture sensors deployed outdoors for 5+ years without maintenance. IC Role / Device Role / Timing Role: Supervises 1.2V ultra-low-power MCU supply, uses 209s watchdog to detect sleep-mode entry failures, and draws only 170nA during 99.9% duty cycle. Use Value: Enables >100,000 reset cycles over product lifetime without degradation, verified per JEDEC JESD22-A108F high-temperature operating life testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK16D3S+T | 1.625V reset threshold (16-suffix), 3.3s watchdog (S-suffix), same D3 150ms timeout and push-pull active-low RESET | Better suited for systems requiring faster watchdog response (e.g., real-time motor control) but incompatible with active-high reset logic | Select when active-low reset polarity is acceptable and shorter watchdog timeout improves safety coverage |
| TPS3837K33DBVR | 3.3V fixed threshold, 200ms reset timeout, 1.6µA supply current, no watchdog, SOT23-5 pin-compatible | Lacks watchdog functionality and nanopower operation; requires higher quiescent current budget | Choose only for cost-sensitive, non-watchdog applications where 1.6µA ICC is acceptable and 3.3V rail supervision suffices |
Compared with MAX6865UK17D3L+T, MAX6864UK16D3S+T offers faster watchdog response but inverted reset polarity, while TPS3837K33DBVR eliminates watchdog capability and increases supply current 9.4× - making MAX6865UK17D3L+T the sole option meeting nanopower, 209s watchdog, and active-high reset requirements simultaneously.
Availability
MAX6865UK17D3L+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered industrial scanners, and ultra-low-power wireless sensors requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6865UK17D3L+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, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX6854–MAX6869 family was engineered specifically for nanopower microprocessor supervision in space-constrained, battery-critical systems - delivering integrated voltage monitoring, manual reset, and configurable watchdog functionality in a single 5-pin SOT23 package.
FAQ
What is the exact reset threshold voltage of the MAX6865UK17D3L+T?
The MAX6865UK17D3L+T features a factory-trimmed reset threshold of 1.665V (±2.5%), corresponding to the "17" suffix in its part number per Maxim's Threshold Suffix Guide. This value is guaranteed over the full -40°C to +85°C operating temperature range and enables precise brownout detection for 1.8V logic supplies. The MAX6865UK17D3L+T maintains this accuracy without requiring external calibration or trimming components.
Does the MAX6865UK17D3L+T require external components for basic operation?
No, the MAX6865UK17D3L+T operates fully autonomously with no external components required. It integrates a 10kΩ internal pullup on the MR pin, precision voltage reference, and timing circuitry. Only a 0.1µF ceramic capacitor from VCC to GND is recommended for noise immunity - a standard practice for all linear regulators and supervisors. The MAX6865UK17D3L+T eliminates need for external resistors, capacitors, or pullups in typical implementations.
How does the watchdog timer in the MAX6865UK17D3L+T behave during MCU reset assertion?
When RESET is asserted (i.e., driven high), the MAX6865UK17D3L+T's internal watchdog timer stops counting. The timer resumes only after RESET deasserts, ensuring that watchdog timeout cannot occur during active reset - preventing race conditions during system recovery. This behavior is explicitly documented in the functional diagram and timing relationships of the MAX6865UK17D3L+T datasheet.
What is the guaranteed minimum VCC level at which MAX6865UK17D3L+T maintains valid RESET output?
The MAX6865UK17D3L+T guarantees valid RESET output down to VCC = +1.1V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Below this voltage, the push-pull driver may not maintain proper VOH/ VOL levels, but the device continues asserting RESET until VCC drops below operational limits. This specification ensures deterministic reset behavior during deep brownout events common in battery-powered medical devices.
Can the MAX6865UK17D3L+T be used with a 1.2V supply rail?
Yes, the MAX6865UK17D3L+T supports VCC from 1.2V to 5.5V per its Absolute Maximum Ratings and Electrical Characteristics. At 1.2V, it maintains 170nA typical supply current and asserts RESET when VCC falls below 1.665V - though operation below 1.665V will trigger reset. Its guaranteed reset validity to 1.1V ensures robust behavior even as the 1.2V rail collapses, making the MAX6865UK17D3L+T suitable for emerging ultra-low-voltage MCU applications.
MAX6865UK17D3L+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:
- 1.665V
- 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
MAX6865UK17D3L+T FAQ
1.How can I place an order for MAX6865UK17D3L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK17D3L+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 MAX6865UK17D3L+T reliable?
The price and inventory of MAX6865UK17D3L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK17D3L+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK17D3L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK17D3L+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6865UK17D3L+T?
MAX6865UK17D3L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK17D3L+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 MAX6865UK17D3L+T?
For technical support, including MAX6865UK17D3L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK17D3L+T requirements.
6.How does Aetrix verify that MAX6865UK17D3L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK17D3L+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 MAX6865UK17D3L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK17D3L+T?
All MAX6865UK17D3L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK17D3L+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 MAX6865UK17D3L+T part is unused and in its original packaging.
Return procedure for MAX6865UK17D3L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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