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Analog Devices Inc./Maxim Integrated MAX6865UK43D5S+T
- Part No.:
- MAX6865UK43D5S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK43D5S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,055
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Product details
Overview
The MAX6865UK43D5S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 4.300V reset threshold (±2.5%), 300ms minimum reset timeout, manual reset input (MR), and watchdog timer with 3.3s typical timeout. It monitors VCC in battery-powered medical and portable electronics to ensure reliable µP initialization during brownout or software lockup.
For engineers reviewing the MAX6865UK43D5S+T datasheet, MAX6865UK43D5S+T pinout, MAX6865UK43D5S+T application, or MAX6865UK43D5S+T equivalent, this page delivers verified electrical parameters, exact pin functions, real-world use cases in glucose monitors and patient monitors, and two confirmed alternative parts with documented functional differences.
Technical Context
This device integrates voltage monitoring, a manual reset input (MR), and a watchdog timer (WDI) in a single BiCMOS IC. Its reset output asserts low when VCC drops below 4.300V, MR is pulled low, or WDI remains static beyond 3.3s - ensuring recovery from power faults and firmware hangs.
The internal reset timeout is fixed at 300ms (D5 option), and the watchdog timeout is factory-set to 3.3s (S suffix). RESET output is active-low push-pull, referenced to VCC, and guaranteed valid down to VCC = +1.1V with immunity to ≤40µs VCC transients at 100mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at +25°C - enables multi-year operation on coin-cell batteries in portable medical devices. |
| Reset Threshold Voltage | 4.300V ±2.5% - precisely matches 4.3V rail monitoring for lithium-ion powered systems. |
| Reset Timeout Period | 300ms minimum (D5) - ensures µP completes power-up sequencing before release from reset. |
| Watchdog Timeout | 3.3s typical (S suffix) - balances responsiveness to firmware lockup against false triggers from slow I/O toggling. |
| VCC Validity Range | Operates down to VCC = +1.1V - guarantees reset assertion integrity during deep brownout conditions. |
| MR Input Pullup | 10kΩ internal pullup to VCC - eliminates need for external resistor in manual reset switch implementation. |
| WDI Pulse Detection | 150ns minimum pulse width - reliably detects fast software-generated watchdog strobes without missing edges. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, footprint compatible with industry-standard 5-pin SOT23 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; sinks current to GND when asserted; referenced to VCC; no external pullup required. |
| 2 | GND | Ground reference for all internal circuitry; must be connected to system ground plane for noise immunity and reset accuracy. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; accepts CMOS logic levels; 1µs minimum pulse width. |
| 4 | WDI | Watchdog input; rising or falling edge clears internal timer; static high/low >3.3s triggers reset; 20nA max input current. |
| 5 | VCC | Main supply input; monitored for reset generation; requires 0.1µF bypass capacitor to GND for stability in noisy environments. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in glucose monitors using CR2032 cells. |
| Guaranteed reset validity to VCC = +1.1V | Ensures deterministic reset assertion even during severe brownout, preventing undefined µP states. |
| Immunity to short VCC transients | Rejects ≤40µs glitches at 100mV overdrive - critical for stable operation in switching-power-supply environments. |
| No external components required | Integrates MR pullup, reset timer, and watchdog logic - reduces BOM count and PCB area in space-constrained wearables. |
| Watchdog transition detector | Detects 150ns WDI edges - supports high-frequency software strobing without timing margin loss. |
Applications
| Glucose Monitors | Patient Monitors |
|---|---|
Use Scenario: Continuous blood glucose sensing in handheld or wearable devices with coin-cell power. IC Role / Device Role / Timing Role: Supervises 3.3V µP supply and resets firmware on brownout or watchdog timeout. Use Value: 170nA ICC extends CR2032 battery life beyond 3 years; 4.3V threshold aligns with Li-ion discharge curve. |
Use Scenario: Portable clinical-grade vital sign monitors operating from rechargeable Li-ion packs. IC Role / Device Role / Timing Role: Provides fail-safe reset during power transitions and detects firmware hangs in real-time data acquisition loops. Use Value: 300ms D5 timeout ensures ADC calibration completes before µP release; 3.3s watchdog prevents missed alarm triggers. |
| PDAs / Handheld Terminals | MP3 Players / Audio Wearables |
Use Scenario: Industrial handheld terminals used in warehouse logistics with intermittent charging cycles. IC Role / Device Role / Timing Role: Monitors main 4.2V battery rail and initiates controlled reboot after unexpected shutdown. Use Value: MR input allows field-service reset via button; SOT23-5 footprint fits tight board layouts under touchscreens. |
Use Scenario: Bluetooth earbuds and compact audio players requiring ultra-low standby power. IC Role / Device Role / Timing Role: Asserts reset during battery undervoltage and recovers from frozen Bluetooth stack via WDI. Use Value: Open-drain compatibility not used here; push-pull RESET drives µP directly without pullup, saving quiescent current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK43D5S+T | No CT pin; identical 4.3V threshold, 300ms timeout, 3.3s watchdog, but lacks pin-selectable timeout. | Suitable where fixed 300ms is sufficient and no timeout flexibility is needed. | Select MAX6864UK43D5S+T if CT functionality is unused - same cost, identical footprint and timing. |
| TPS3836K33DBVR | 3.3V fixed threshold, 200ms timeout, no watchdog, 1.6µA ICC - higher supply current, no WDI capability. | Limited to simple voltage monitoring without firmware supervision. | Choose only if watchdog is unnecessary and system operates at 3.3V; not drop-in due to different threshold and missing WDI. |
Compared with MAX6865UK43D5S+T, MAX6864UK43D5S+T offers identical core supervision but omits CT selectability, while TPS3836K33DBVR lacks watchdog and draws 9x more current - making MAX6865UK43D5S+T the sole choice for low-power, watchdog-enabled 4.3V rail monitoring.
Availability
MAX6865UK43D5S+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, and handheld PDAs requiring stable component supply across extended production lifecycles and battery-life-critical designs.
Supply support for MAX6865UK43D5S+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 management, sensing, and interface applications in industrial, medical, and consumer markets.
The MAX6854–MAX6869 family delivers nanopower supervisory circuits optimized for battery longevity and reliability in portable medical and handheld electronics - specifically targeting applications where µP reset integrity and watchdog-based firmware recovery are non-negotiable.
FAQ
What is the exact reset threshold voltage of the MAX6865UK43D5S+T?
The MAX6865UK43D5S+T has a factory-trimmed reset threshold of 4.300V 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 "43" corresponds to 4.300V nominal. The device asserts reset when VCC falls below this threshold and holds reset for 300ms after VCC rises above it.
Does the MAX6865UK43D5S+T include a watchdog timer, and what is its timeout?
Yes, the MAX6865UK43D5S+T includes a watchdog timer with a typical timeout of 3.3s, indicated by the "S" suffix in the part number. The timer expires if the WDI pin remains static (high or low) beyond this period, triggering a reset for the full 300ms timeout. The timer clears on any WDI edge, MR assertion, or active reset - ensuring robust detection of firmware stalls.
What is the function of Pin 4 (WDI) on the MAX6865UK43D5S+T?
Pin 4 is the Watchdog Input (WDI) on the MAX6865UK43D5S+T. It monitors µP activity: a rising or falling edge clears the internal watchdog timer, while static high or low states longer than 3.3s cause reset assertion. WDI accepts CMOS-compatible logic levels, draws ≤20nA, and detects pulses as short as 150ns - enabling precise software-controlled watchdog strobing without hardware overhead.
Is the MAX6865UK43D5S+T pin-compatible with other parts in the MAX68xx family?
The MAX6865UK43D5S+T uses the standard 5-pin SOT23-5 package and shares identical pinout with MAX6864/MAX6866 variants (Pin 1=RESET, Pin 2=GND, Pin 3=MR, Pin 4=WDI, Pin 5=VCC). It is not pin-compatible with MAX6861–MAX6863 (which use Pin 1=CT) or MAX6867–MAX6869 (which use Pin 1=WDI), as CT and WDI positions differ across subfamilies.
What is the minimum supply voltage at which the MAX6865UK43D5S+T guarantees valid reset operation?
The MAX6865UK43D5S+T guarantees valid reset output down to VCC = +1.1V, as specified in the Electrical Characteristics table. Below this voltage, RESET assertion is not assured - a critical design boundary for battery-powered systems experiencing deep discharge. This specification ensures deterministic behavior during brownout, unlike many supervisors that fail unpredictably near 1.2V.
MAX6865UK43D5S+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:
- 4.3V
- 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
MAX6865UK43D5S+T FAQ
1.How can I place an order for MAX6865UK43D5S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK43D5S+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 MAX6865UK43D5S+T reliable?
The price and inventory of MAX6865UK43D5S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK43D5S+T is usually 5 days.
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Once your MAX6865UK43D5S+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 MAX6865UK43D5S+T?
For technical support, including MAX6865UK43D5S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK43D5S+T requirements.
6.How does Aetrix verify that MAX6865UK43D5S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK43D5S+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 MAX6865UK43D5S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK43D5S+T?
All MAX6865UK43D5S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK43D5S+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 MAX6865UK43D5S+T part is unused and in its original packaging.
Return procedure for MAX6865UK43D5S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6865UK43D5S+T Tags
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