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Analog Devices Inc./Maxim Integrated MAX6865UK20D5S+T
- Part No.:
- MAX6865UK20D5S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK20D5S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,567
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Product details
Overview
The MAX6865UK20D5S+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) functions. It asserts an active-high push-pull RESET output when VCC drops below 2.000V (±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) at 2.5V and guarantees valid reset operation down to VCC = +1.1V.
For engineers reviewing the MAX6865UK20D5S+T datasheet, MAX6865UK20D5S+T pinout, MAX6865UK20D5S+T application, or MAX6865UK20D5S+T equivalent, key selection criteria include its factory-trimmed 2.0V reset threshold, 450ms (typ) reset timeout period, 3.3s watchdog timeout, active-high push-pull RESET output, and compatibility with battery-powered medical and portable electronics requiring guaranteed reset validity below 1.2V.
Technical Context
This device implements a precision bandgap-based voltage monitor with 2.5% threshold tolerance 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). The internal reset timeout generator provides a fixed 450ms (typ) assertion period after VCC recovery, MR release, or watchdog expiration.
The MAX6865UK20D5S+T uses BiCMOS process technology (2848 transistors) to achieve ultra-low ICC of 170nA (typ) while maintaining robust noise immunity - immune to VCC transients ≤40µs at 100mV overdrive - and features an internally pulled-up MR input (10kΩ) and CMOS-compatible WDI with 150ns pulse-width detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.000V ±2.5% - ensures reliable brownout detection for 2.0V–3.3V logic domains |
| Supply Current | 170nA (typ) at 2.5V - enables multi-year operation in coin-cell–powered devices |
| Reset Timeout Period | 450ms (typ), min 300ms - holds µP in reset long enough for full power stabilization |
| Watchdog Timeout | 3.3s (typ), range 1.5s–7.75s - balances fault coverage and software execution margin |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup and interfaces directly to µP reset pins |
| VCC Operating Range | 1.2V to 5.5V - supports wide-input battery and LDO-supplied systems |
| Guaranteed Reset Validity | Down to VCC = +1.1V - ensures deterministic reset behavior during deep brownout |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, footprint compatible with industry-standard 5-lead SOT23.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives µP reset pin directly; sinks/source current per VOH/VOL specs |
| 2 | GND | Ground reference - must be connected to system ground plane for stable threshold and timing |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC (10kΩ); accepts CMOS logic or open-drain signals |
| 4 | WDI | Watchdog input - edge-sensitive (rising/falling); clears internal timer on each transition; detects ≥150ns pulses |
| 5 | VCC | Supply voltage input - monitored for reset generation; requires 0.1µF bypass capacitor to GND for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA (typ) enables >10-year battery life in glucose monitors and wearables |
| Factory-trimmed reset threshold | 2.000V ±2.5% eliminates external resistor networks and calibration overhead |
| Watchdog timer with edge-clearing | Prevents stuck-loop failures by requiring active software toggling of WDI, not just periodic pulses |
| Guaranteed reset validity to 1.1V | Ensures deterministic reset assertion even during severe brownout conditions before µP loses functionality |
| No external components required | Integrates MR pullup, reset timing, and watchdog logic - reduces BOM count and PCB area |
Applications
| Portable Medical Devices | Battery-Powered IoT Sensors |
|---|---|
|
Use Scenario: Glucose meters and patient monitors powered by single CR2032 coin cells operating across temperature and aging-induced voltage droop. IC Role / Device Role: Voltage supervisor and watchdog - monitors VCC, initiates reset on brownout, and forces recovery if firmware hangs. Use Value: 170nA quiescent current extends battery life beyond 3 years; 2.0V threshold aligns with end-of-life battery voltage; 3.3s watchdog prevents missed readings due to frozen UI. |
Use Scenario: Low-power environmental sensors transmitting data intermittently via BLE or LoRaWAN, sleeping between measurements. IC Role / Device Role: System-level reset controller - ensures clean wake-up from deep sleep and recovers from corrupted radio stack states. Use Value: Active-high push-pull RESET eliminates external pullup, reducing leakage paths; 450ms timeout accommodates slow LDO startup and crystal stabilization. |
| Industrial Handheld Terminals | Wearable Health Trackers |
|
Use Scenario: Ruggedized barcode scanners and field service tools subjected to ESD, cable discharge, and rapid battery swaps. IC Role / Device Role: Fault-resilient supervisory IC - detects VCC glitches, responds to user-initiated MR, and resets MCU after watchdog timeout. Use Value: Immunity to ≤40µs VCC transients prevents spurious resets; MR input accepts noisy switch inputs without external debounce; 10kΩ internal pullup simplifies front-panel design. |
Use Scenario: Fitness bands with optical heart-rate sensors and motion processors, operating continuously on rechargeable Li-ion cells. IC Role / Device Role: Dual-role supervisor - monitors core rail voltage and validates firmware execution via WDI toggling during sensor acquisition cycles. Use Value: 2.0V reset threshold matches typical Li-ion discharge curve; 3.3s watchdog timeout allows full sensor initialization and data processing before next WDI toggle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK20D5S+T | Active-low push-pull RESET output; identical threshold, timeout, and watchdog specs | Requires inverted reset logic on µP side; incompatible with active-high reset inputs | Select when host µP accepts only active-low reset assertion |
| TPS3836K20DBVR | 2.0V threshold, 350ms timeout, no watchdog; 1.6µA supply current; SOT23-5 package | Lacks watchdog functionality; higher ICC limits battery lifetime in always-on devices | Choose where watchdog is unnecessary and cost is prioritized over ultra-low power |
Compared with MAX6864UK20D5S+T, the MAX6865UK20D5S+T provides native active-high reset compatibility without level-shifting, while TPS3836K20DBVR offers lower cost but sacrifices both watchdog capability and nanopower operation - making MAX6865UK20D5S+T optimal for safety-critical, battery-constrained applications requiring autonomous fault recovery.
Availability
MAX6865UK20D5S+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered IoT sensors, industrial handheld terminals, and wearable health trackers requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6865UK20D5S+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 interface applications in industrial, medical, and communications markets.
The MAX6854–MAX6869 family delivers nanopower supervisory functionality for battery-critical systems, emphasizing ultra-low ICC, guaranteed sub-1.2V reset validity, and integrated watchdog timers to enhance firmware reliability in portable electronics.
FAQ
What is the exact reset threshold voltage of the MAX6865UK20D5S+T?
The MAX6865UK20D5S+T has a factory-trimmed reset threshold of 2.000V with ±2.5% tolerance over –40°C to +85°C, as defined by the "20" suffix in its part number per Maxim's Threshold Suffix Guide. This value is laser-trimmed during production and does not require external calibration.
Does the MAX6865UK20D5S+T include a watchdog timer, and what is its timeout?
Yes, the MAX6865UK20D5S+T includes a watchdog timer with a nominal timeout of 3.3s (typ), corresponding to the "S" suffix in its part number. The actual timeout ranges from 1.5s to 7.75s over temperature and process variation, and the timer clears on any rising or falling edge at the WDI pin.
What type of RESET output does the MAX6865UK20D5S+T provide?
The MAX6865UK20D5S+T provides an active-high push-pull RESET output (pin 1), meaning it drives high when asserting reset and low when deasserting. This eliminates the need for an external pullup resistor and ensures direct compatibility with microprocessors requiring active-high reset inputs.
What is the reset timeout period for the MAX6865UK20D5S+T?
The MAX6865UK20D5S+T has a fixed reset timeout period of 450ms (typ), with a minimum of 300ms and maximum of 600ms, as indicated by the "D5" suffix. This timeout applies after VCC rises above threshold, MR is released, or the watchdog expires - ensuring sufficient time for power rails and clocks to stabilize.
Is the MAX6865UK20D5S+T compatible with 1.8V and 3.3V systems?
Yes, the MAX6865UK20D5S+T operates across a VCC range of 1.2V to 5.5V and guarantees valid reset assertion down to VCC = +1.1V. Its 2.0V reset threshold is ideal for 1.8V I/O domains, while its push-pull RESET output interfaces natively with both 1.8V and 3.3V microprocessor reset inputs.
MAX6865UK20D5S+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:
- 2V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 300ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK20D5S+T FAQ
1.How can I place an order for MAX6865UK20D5S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK20D5S+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 MAX6865UK20D5S+T reliable?
The price and inventory of MAX6865UK20D5S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK20D5S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK20D5S+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK20D5S+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6865UK20D5S+T?
MAX6865UK20D5S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK20D5S+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 MAX6865UK20D5S+T?
For technical support, including MAX6865UK20D5S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK20D5S+T requirements.
6.How does Aetrix verify that MAX6865UK20D5S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK20D5S+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 MAX6865UK20D5S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK20D5S+T?
All MAX6865UK20D5S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK20D5S+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 MAX6865UK20D5S+T part is unused and in its original packaging.
Return procedure for MAX6865UK20D5S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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