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Analog Devices Inc./Maxim Integrated MAX6865UK42D3L+T
- Part No.:
- MAX6865UK42D3L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK42D3L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,524
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Product details
Overview
The MAX6865UK42D3L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, combining voltage monitoring (4.200V 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-low push-pull RESET output during VCC brownout, MR assertion, or watchdog timeout, maintaining reset for 150ms minimum after recovery - ideal for battery-powered glucose monitors and portable medical devices.
For engineers reviewing the MAX6865UK42D3L+T datasheet, MAX6865UK42D3L+T pinout, MAX6865UK42D3L+T application, or MAX6865UK42D3L+T equivalent, key selection criteria include its guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), pin-selectable reset timeout options, and compatibility with low-voltage µP systems requiring long battery life and robust fault detection.
Technical Context
The MAX6865UK42D3L+T implements a dual-trigger reset architecture: one path responds to VCC falling below 4.200V ±2.5%, the second activates on MR low assertion, and the third triggers when WDI remains static beyond 209s (typ). Its internal watchdog transition detector clears on any rising or falling edge at WDI, supporting reliable software execution monitoring without external timing components.
Reset assertion is latched and held for a fixed 150ms minimum timeout (D3 option) after VCC rises above threshold and MR deasserts - independent of watchdog state. The push-pull active-low RESET output drives directly to GND or VCC, eliminating need for external pullup and ensuring valid logic levels across 1.2V–5.5V VCC operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.200V ±2.5% - factory-trimmed for precise brownout detection at nominal 4.2V Li-ion battery systems |
| Supply Current (typ) | 170nA at VCC = 1.8V - enables multi-year operation on coin-cell batteries in portable medical devices |
| Reset Timeout Period | 150ms (min) - ensures µP completes power-rail stabilization before release from reset |
| Watchdog Timeout (typ) | 209s - provides extended software execution window for low-duty-cycle embedded firmware |
| VCC Operating Range | 1.2V to 5.5V - supports wide-input battery and regulated rail applications including 1.8V/3.3V/5V systems |
| Reset Output Type | Push-pull active-low - eliminates external pullup resistor, reduces BOM count, and guarantees defined logic state |
| Guaranteed Reset Validity | Down to VCC = +1.1V - ensures deterministic reset behavior during deep brownout conditions |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount. Compact 2.9mm × 1.6mm footprint with 0.95mm height, optimized for space-constrained portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output - drives low during fault conditions; no external pullup required |
| 2 | GND | Ground reference - must be connected to system ground plane for stable reset threshold and noise immunity |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; accepts CMOS-level signals or momentary switch to GND |
| 4 | WDI | Watchdog input - edge-sensitive (150ns min pulse); resets internal timer on rising/falling transitions |
| 5 | VCC | Supply voltage input - monitored for brownout; bypass with 0.1µF capacitor to GND for noise rejection |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in always-on patient monitors |
| Factory-trimmed VTH | 4.200V ±2.5% threshold eliminates external resistor network and calibration overhead |
| Watchdog immunity | 209s timeout prevents spurious resets from brief firmware stalls while catching true hangs |
| VCC transient immunity | Immune to ≤40µs VCC glitches at 100mV overdrive - suppresses false resets in noisy power environments |
| No external components | Self-contained supervision: no capacitors, resistors, or external timing elements required |
Applications
| Portable Glucose Monitors | Battery-Powered Patient Monitors |
|---|---|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission in handheld diagnostic devices. IC Role / Device Role / Timing Role: Supervisory IC monitors 3.3V LDO output and asserts reset if voltage sags during RF transmission burst or battery depletion. Use Value: Prevents corrupted sensor readings or failed BLE handshakes by ensuring µP restarts cleanly before executing critical measurement routines. |
Use Scenario: Wearable ECG patch with multi-day battery life and intermittent wireless data upload. IC Role / Device Role / Timing Role: Resets ARM Cortex-M0+ host MCU upon VCC drop below 4.2V (indicating end-of-battery) or software lockup detected via WDI timeout. Use Value: Guarantees clinical-grade reliability: 209s watchdog window accommodates deep-sleep cycles while preventing undetected firmware freezes. |
| Low-Power IoT Sensors | Industrial Handheld Terminals |
Use Scenario: Soil moisture sensor node powered by AA alkaline cells, transmitting hourly via LoRaWAN. IC Role / Device Role / Timing Role: Provides brownout reset at 4.2V threshold and 150ms hold time to ensure clean boot after cold-start from depleted battery. Use Value: Eliminates startup failures due to marginal VCC; 170nA ICC extends usable battery life by >30% versus standard supervisors. |
Use Scenario: Ruggedized barcode scanner used in warehouse logistics with frequent drop-induced MCU crashes. IC Role / Device Role / Timing Role: Detects both power instability (via VCC monitor) and firmware hang (via WDI toggling) to force controlled reboot. Use Value: Reduces field service calls: MR input allows technician-initiated reset without opening enclosure; push-pull RESET ensures immediate µP response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK42D3S+T | Same 4.200V threshold and D3 (150ms) timeout, but 3.3s watchdog (S suffix) instead of 209s (L suffix) | Better suited for fast-response systems requiring sub-5s watchdog coverage (e.g., real-time motor control) | Select MAX6864UK42D3S+T only if shorter watchdog interval aligns with firmware execution profile |
| TPS3836K33DBVR | 3.3V fixed threshold, 200ms reset timeout, no watchdog, 1.2µA ICC - 7× higher supply current than MAX6865UK42D3L+T | Limited to 3.3V systems; lacks watchdog functionality required for autonomous medical device safety compliance | Choose TPS3836K33DBVR only for cost-sensitive, non-watchdog applications where 1.2µA ICC is acceptable |
Compared with MAX6864UK42D3S+T and TPS3836K33DBVR, the MAX6865UK42D3L+T uniquely delivers 4.2V precision threshold, 209s watchdog, and nanopower operation in one 5-pin SOT23 - making it the only choice for long-life, high-reliability 4.2V battery-monitoring applications requiring certified fault recovery.
Availability
MAX6865UK42D3L+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered IoT sensors, industrial handheld terminals, and low-power wearables requiring stable component supply with full traceability and lifecycle support.
Supply support for MAX6865UK42D3L+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 delivers nanopower supervisory functions targeting battery-critical systems where ultra-low ICC, guaranteed reset validity down to 1.1V, and integrated watchdog capability are essential design requirements.
FAQ
What is the exact reset threshold voltage of the MAX6865UK42D3L+T?
The MAX6865UK42D3L+T features a factory-trimmed reset threshold voltage of 4.200V, with tolerance of ±2.5% over the full -40°C to +85°C temperature range. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "42" corresponds to 4.200V nominal. The device guarantees valid reset assertion down to VCC = +1.1V, making it suitable for Li-ion battery monitoring near end-of-discharge.
Does the MAX6865UK42D3L+T require external components for basic operation?
No, the MAX6865UK42D3L+T operates autonomously with no external components required for core supervision. Its 170nA typical supply current, factory-trimmed 4.200V threshold, 150ms reset timeout, and 209s watchdog are all internally implemented. A 0.1µF bypass capacitor on VCC is recommended for noise immunity but not strictly required for functional operation per datasheet specifications.
How does the watchdog timer in the MAX6865UK42D3L+T respond to software activity?
The MAX6865UK42D3L+T watchdog timer clears on any rising or falling edge at the WDI pin - not just toggles - and has a typical timeout of 209s. It remains disabled until first asserted, then resets only upon edge detection. If firmware fails to drive WDI within 209s, the device asserts RESET for 150ms. The timer pauses during RESET assertion and resumes counting immediately upon deassertion.
Can the MAX6865UK42D3L+T be used with a 1.8V microcontroller supply?
Yes, the MAX6865UK42D3L+T operates across VCC = 1.2V to 5.5V and guarantees reset validity down to VCC = +1.1V. Its push-pull active-low RESET output drives fully to GND and VCC, ensuring compatible logic levels with 1.8V µPs. Supply current remains at 170nA typical even at 1.8V, preserving battery life in low-voltage portable systems.
What is the function of Pin 4 (WDI) on the MAX6865UK42D3L+T?
Pin 4 of the MAX6865UK42D3L+T is the Watchdog Input (WDI), which monitors µP software execution. The internal watchdog timer expires if WDI remains static (high or low) for longer than 209s (typ), triggering a 150ms reset pulse. WDI accepts CMOS-level signals and detects edges as short as 150ns; each rising or falling edge resets the watchdog counter, enabling flexible firmware integration without dedicated toggle routines.
MAX6865UK42D3L+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:
- 4.2V
- 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
MAX6865UK42D3L+T FAQ
1.How can I place an order for MAX6865UK42D3L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK42D3L+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 MAX6865UK42D3L+T reliable?
The price and inventory of MAX6865UK42D3L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK42D3L+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK42D3L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK42D3L+T transactions.
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4.How is shipping managed for MAX6865UK42D3L+T?
MAX6865UK42D3L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK42D3L+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 MAX6865UK42D3L+T?
For technical support, including MAX6865UK42D3L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK42D3L+T requirements.
6.How does Aetrix verify that MAX6865UK42D3L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK42D3L+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 MAX6865UK42D3L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK42D3L+T?
All MAX6865UK42D3L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK42D3L+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 MAX6865UK42D3L+T part is unused and in its original packaging.
Return procedure for MAX6865UK42D3L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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