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Analog Devices Inc./Maxim Integrated MAX6865UK32D1S+T
- Part No.:
- MAX6865UK32D1S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK32D1S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,533
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Product details
Overview
The MAX6865UK32D1S+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 3.200V (±2.5%), MR is pulled low, or the watchdog times out after 3.3s (typ). Designed for ultra-low-power systems, it draws only 170nA (typ) supply current and guarantees valid reset operation down to VCC = +1.1V.
For engineers reviewing the MAX6865UK32D1S+T datasheet, MAX6865UK32D1S+T pinout, MAX6865UK32D1S+T application, or MAX6865UK32D1S+T equivalent, key selection criteria include its factory-trimmed 3.200V reset threshold, 10ms minimum reset timeout, 3.3s watchdog period, active-high push-pull RESET output, and compatibility with battery-powered medical and portable electronics requiring guaranteed reset assertion at low VCC.
Technical Context
The MAX6865UK32D1S+T implements a precision bandgap-based voltage monitor with 2.5% threshold accuracy over –40°C to +85°C, coupled with a digital watchdog timer that clears on any WDI edge and expires if WDI remains static beyond 3.3s (typ). Its internal 10kΩ MR pullup enables direct connection of a momentary switch to GND without external components.
Reset assertion is synchronized to VCC crossing the 3.200V threshold, with a guaranteed minimum 10ms deassertion delay after VCC exceeds threshold and MR deasserts. The active-high push-pull RESET output drives to ≥0.8×VCC when deasserted and ≤0.3V when asserted under specified load conditions, eliminating need for external pullups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.200V ±2.5% - factory-trimmed for precise brownout detection at nominal 3.3V rail |
| Supply Current | 170nA (typ) at VCC = 1.8V - enables multi-year battery life in always-on portable devices |
| Reset Timeout | 10ms (min) - ensures µP reset pulse meets minimum assertion time requirements |
| Watchdog Timeout | 3.3s (typ) - provides robust software execution monitoring without excessive timeout latency |
| RESET Output Type | Active-high push-pull - eliminates external pullup resistor and supports direct µP reset input |
| VCC Validity Range | Guaranteed RESET validity down to VCC = +1.1V - ensures reliable reset during deep brownout |
| MR Input Logic | Active-low with 10kΩ internal pullup to VCC - simplifies manual reset implementation with momentary switch |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives high during reset assertion; referenced to VCC |
| 2 | GND | Ground reference - must be connected to system ground plane for stable operation |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC; logic low initiates reset |
| 4 | WDI | Watchdog input - rising or falling edge clears internal timer; static state >3.3s triggers reset |
| 5 | VCC | Supply voltage input - monitored for reset threshold violation; bypass with 0.1µF to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical - reduces quiescent power in battery-backed systems by >95% vs. standard supervisors |
| Immunity to short VCC transients | Rejects ≤40µs transients at 100mV overdrive - prevents false resets in noisy power environments |
| No external components required | Integrated MR pullup, precision threshold, and watchdog - eliminates BOM cost and layout area |
| Guaranteed reset validity to 1.1V | RESET remains functional even as VCC collapses - critical for fail-safe behavior in brownout |
| Watchdog edge-triggered clear | Any WDI transition (rising/falling) resets watchdog timer - supports flexible software polling schemes |
Applications
| Portable Glucose Monitors | Patient Vital Sign Loggers |
|---|---|
Use Scenario: Continuous glucose sensing with Bluetooth LE transmission in disposable wearable patches. IC Role / Device Role / Timing Role: Supervises 3.3V coin-cell–powered MCU and sensor interface; asserts RESET on battery sag or firmware hang via WDI. Use Value: 170nA ICC extends single-CR2032 battery life beyond 18 months; 3.200V threshold matches nominal rail; 3.3s watchdog detects unresponsive BLE stack. |
Use Scenario: Ambulatory ECG/SpO₂ recorder with flash memory logging and USB charging. IC Role / Device Role / Timing Role: Monitors main 3.3V supply and provides manual reset via button; watchdog guards against corrupted data writes. Use Value: Active-high push-pull RESET directly interfaces with ARM Cortex-M0+ reset pin; 10ms timeout satisfies JEDEC JESD78 requirement. |
| Low-Power Smart Asset Trackers | Industrial Wireless Sensor Nodes |
Use Scenario: GPS-enabled cold-chain tracker operating on Li-SOCl₂ battery with 10-year shelf life. IC Role / Device Role / Timing Role: Ensures reliable boot after temperature-induced voltage droop; WDI tied to GPS fix interrupt. Use Value: Guaranteed RESET down to 1.1V prevents undefined MCU state during deep cold start; 3.200V threshold avoids premature reset during transient load spikes. |
Use Scenario: LoRaWAN node with ultra-low-duty-cycle sampling and intermittent RF transmission. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output; MR used for field firmware recovery; WDI monitors sensor acquisition loop. Use Value: No external components reduce PCB footprint in space-constrained enclosures; 2.5% threshold tolerance ensures consistent trip point across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK32D1S+T | Active-low push-pull RESET output; identical threshold, timeout, and watchdog specs | Requires inverted reset logic on host µP; not compatible with active-high reset inputs | Select when host MCU requires active-low reset assertion and board layout cannot accommodate level-shifting. |
| TPS3837K33DBVR | 3.3V fixed threshold (±2.0%), 200ms min timeout, no watchdog, 1.2µA ICC | Lacks WDI functionality; higher supply current limits battery lifetime in always-on designs | Choose only for cost-sensitive, non-watchdog applications where 200ms timeout is acceptable and µP supports active-low open-drain reset. |
Compared with MAX6864UK32D1S+T and TPS3837K33DBVR, the MAX6865UK32D1S+T uniquely delivers active-high push-pull RESET, 3.3s watchdog, and 170nA ICC in one 5-pin SOT23 - enabling simpler µP interface, longer battery life, and stronger firmware reliability in portable medical and industrial edge nodes.
Availability
MAX6865UK32D1S+T is available at Aetrix Electronics and suitable for portable glucose monitors, patient vital sign loggers, low-power smart asset trackers, and industrial wireless sensor nodes requiring stable component supply and long-term lifecycle support.
Supply support for MAX6865UK32D1S+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 connectivity in demanding industrial, medical, and automotive applications.
The MAX6865UK32D1S+T belongs to Maxim's nanopower µP supervisory family, engineered specifically for battery-critical portable electronics where ultra-low ICC, guaranteed low-VCC reset validity, and integrated watchdog functionality are mandatory.
FAQ
What is the exact reset threshold voltage of the MAX6865UK32D1S+T?
The MAX6865UK32D1S+T has a factory-trimmed reset threshold of 3.200V with ±2.5% tolerance over –40°C to +85°C. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "32" corresponds to 3.200V nominal. The device guarantees valid reset assertion down to VCC = +1.1V, making it suitable for brownout detection in low-voltage battery systems.
Does the MAX6865UK32D1S+T require external components for basic operation?
No, the MAX6865UK32D1S+T operates autonomously with no external components required. It integrates a 10kΩ internal pullup on the MR pin, precision voltage reference, and watchdog timer. Only a 0.1µF ceramic capacitor from VCC to GND is recommended for noise immunity - a standard practice for all linear regulators and supervisors, not a design requirement unique to the MAX6865UK32D1S+T.
What is the function of the WDI pin on the MAX6865UK32D1S+T?
The WDI (Watchdog Input) pin on the MAX6865UK32D1S+T monitors microprocessor activity: any rising or falling edge clears the internal watchdog timer, while a static high or low state exceeding 3.3s (typ) triggers a reset pulse. This ensures firmware hangs or infinite loops are automatically recovered. The WDI pin accepts CMOS logic levels and rejects pulses shorter than 150ns, preventing false timeouts from noise.
How does the MAX6865UK32D1S+T differ from the MAX6864UK32D1S+T?
The MAX6865UK32D1S+T and MAX6864UK32D1S+T share identical reset threshold (3.200V), timeout (10ms min), and watchdog (3.3s typ), but differ in RESET polarity: MAX6865UK32D1S+T provides active-high push-pull output, while MAX6864UK32D1S+T provides active-low push-pull. This makes MAX6865UK32D1S+T directly compatible with MCUs requiring active-high reset inputs without level-shifting circuitry.
Is the MAX6865UK32D1S+T suitable for use with lithium coin-cell batteries?
Yes, the MAX6865UK32D1S+T is explicitly designed for coin-cell and primary battery applications. Its 170nA typical supply current minimizes drain, and guaranteed reset validity down to VCC = +1.1V ensures reliable operation as the battery discharges from 3.0V to end-of-life. The 3.200V threshold aligns with nominal 3.3V rails commonly regulated from CR2032 or BR2032 cells.
MAX6865UK32D1S+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:
- 3.2V
- 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
MAX6865UK32D1S+T FAQ
1.How can I place an order for MAX6865UK32D1S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK32D1S+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 MAX6865UK32D1S+T reliable?
The price and inventory of MAX6865UK32D1S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK32D1S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK32D1S+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK32D1S+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6865UK32D1S+T?
MAX6865UK32D1S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK32D1S+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 MAX6865UK32D1S+T?
For technical support, including MAX6865UK32D1S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK32D1S+T requirements.
6.How does Aetrix verify that MAX6865UK32D1S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK32D1S+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 MAX6865UK32D1S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK32D1S+T?
All MAX6865UK32D1S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK32D1S+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 MAX6865UK32D1S+T part is unused and in its original packaging.
Return procedure for MAX6865UK32D1S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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