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Analog Devices Inc./Maxim Integrated MAX6865UK35D4S+T
- Part No.:
- MAX6865UK35D4S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK35D4S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,056
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Product details
Overview
The MAX6865UK35D4S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, combining voltage monitoring (3.5V reset threshold), manual reset input (MR), and watchdog timer (209s typical timeout) with ultra-low 170nA supply current. It asserts an active-high push-pull RESET output during VCC brownout, MR assertion, or watchdog timeout, and holds reset for 1200ms minimum after recovery - ideal for battery-powered glucose monitors and portable medical devices.
For engineers reviewing the MAX6865UK35D4S+T datasheet, MAX6865UK35D4S+T pinout, MAX6865UK35D4S+T application, or MAX6865UK35D4S+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 watchdog intervals and minimal quiescent power.
Technical Context
This device implements a precision bandgap-based voltage monitor with ±2.5% reset threshold accuracy and 0.5% hysteresis, paired with a temperature-stable RC-based watchdog timer (L-suffix = 209s typ). Its internal 10kΩ MR pullup and glitch rejection (200ns) enable robust manual reset handling without external components.
The active-high push-pull RESET output delivers VOH ≥ 0.8×VCC at ISOURCE = 500µA (VCC ≥ 2.38V) and VOL ≤ 0.3V at ISINK = 1.2mA (VCC ≥ 2.38V), ensuring reliable interface with 1.8V–5.5V logic domains while maintaining valid reset signaling across its full operating range (–40°C to +85°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.500V ±2.5% - factory-trimmed for precise brownout detection at nominal 3.3V rail |
| Supply Current | 170nA typical - enables >10-year battery life in coin-cell-powered patient monitors |
| Reset Timeout | 1200ms minimum - ensures full µP initialization and firmware boot sequence completion |
| Watchdog Timeout | 209s typical (L-suffix) - supports long-cycle embedded applications like periodic sensor polling |
| VCC Operating Range | 1.2V to 5.5V - allows operation across Li-ion, alkaline, and regulated DC supplies |
| Reset Validity | Guaranteed to VCC = +1.1V - maintains deterministic reset state during deep brownout |
| MR Glitch Rejection | 200ns - suppresses noise-induced false resets in electrically noisy medical environments |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, 2.9mm × 1.6mm footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives high during fault conditions; no external pullup required |
| 2 | GND | Ground reference - must be connected to system ground plane for stable threshold reference |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC (10kΩ); accepts CMOS-level signals |
| 4 | WDI | Watchdog input - edge-sensitive; clears timer on rising/falling transitions; rejects pulses <150ns |
| 5 | VCC | Supply and monitored voltage input - requires 0.1µF bypass capacitor to GND for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current - reduces battery drain by >99% vs. standard supervisors |
| Reset threshold accuracy | ±2.5% over –40°C to +85°C - eliminates need for external calibration in portable medical designs |
| Watchdog stability | 209s typical timeout with <±25% variation over temperature - enables predictable fail-safe timing |
| No external components | Integrated MR pullup, reset timer, and watchdog oscillator - reduces BOM count and PCB area |
| VCC transient immunity | Immune to 40µs/100mV VCC glitches - prevents spurious resets in motor-driven or RF-noisy systems |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Monitors |
|---|---|
|
Use Scenario: Continuous glucose sensing with Bluetooth LE transmission every 5 minutes, powered by CR2032 coin cell. IC Role / Device Role: Supervises 3.3V LDO output and triggers full system reset if firmware hangs or voltage sags below 3.5V. Use Value: 170nA quiescent current extends battery life beyond 2 years; 209s watchdog interval aligns with sensor sampling cycle. |
Use Scenario: Portable ECG/SpO₂ unit with dual-supply architecture (1.8V digital core, 3.3V analog front-end). IC Role / Device Role: Monitors 3.3V rail and asserts RESET to both domains upon brownout or software lockup. Use Value: Guaranteed reset validity to VCC = +1.1V ensures deterministic behavior during gradual battery depletion. |
| Industrial Handheld Scanners | Smart Wearable Health Trackers |
|
Use Scenario: Rugged barcode scanner with intermittent 2G/3G connectivity and motion-triggered wake-up. IC Role / Device Role: Provides manual reset via button press and watchdog supervision of modem firmware execution. Use Value: MR glitch rejection (200ns) prevents false resets from ESD events; 1200ms reset timeout accommodates full modem reinitialization. |
Use Scenario: Wrist-worn activity tracker with heart-rate sensor, accelerometer, and BLE radio. IC Role / Device Role: Supervises 1.8V core supply and resets application processor if sensor data pipeline stalls. Use Value: Active-high RESET directly interfaces with µP's active-high reset pin; no level-shifting required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK35D4S+T | Same 3.5V threshold, 1200ms timeout, and 209s watchdog, but features active-low push-pull RESET output | Requires inverted reset logic on µP side; unsuitable where active-high reset is mandatory | Select MAX6864UK35D4S+T only when µP reset pin is active-low and board layout cannot accommodate signal inversion |
| TPS3837K33DBVR | 3.3V fixed threshold, 200ms reset timeout, no watchdog timer, 1.5µA supply current | Lacks watchdog functionality and offers 8.8× higher ICC - insufficient for multi-year battery life targets | Choose TPS3837K33DBVR only for cost-sensitive, non-watchdog applications where 1200ms timeout and 170nA ICC are not required |
Compared with MAX6865UK35D4S+T, MAX6864UK35D4S+T provides identical supervision parameters but inverted reset polarity, while TPS3837K33DBVR sacrifices watchdog capability and ultra-low power for lower unit cost and simpler integration in short-duration applications.
Availability
MAX6865UK35D4S+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign recorders, industrial handheld scanners, and smart wearable health trackers requiring stable component supply and long-term lifecycle support.
Supply support for MAX6865UK35D4S+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 demanding industrial, medical, and communications applications.
The MAX6854–MAX6869 family was engineered specifically for ultra-low-power microprocessor supervision in battery-critical portable medical and consumer electronics, emphasizing nanoscale current consumption and robust reset reliability.
FAQ
What is the exact reset threshold voltage of the MAX6865UK35D4S+T?
The MAX6865UK35D4S+T has a factory-trimmed reset threshold of 3.500V with ±2.5% tolerance over –40°C to +85°C, corresponding to the "35" suffix in its part number per Maxim's Threshold Suffix Guide. This value is verified in the Electrical Characteristics table and ensures accurate brownout detection for 3.3V nominal rails.
Does the MAX6865UK35D4S+T require external components for basic operation?
No, the MAX6865UK35D4S+T operates autonomously with no external components required: it includes an internal 10kΩ pullup on MR, a precision voltage reference, RC-based watchdog oscillator, and reset timeout generator. Only a 0.1µF ceramic bypass capacitor on VCC is recommended for noise immunity - no resistors, capacitors, or diodes are needed for core supervision functions.
How does the watchdog timer in the MAX6865UK35D4S+T behave during reset assertion?
While RESET is asserted (active-high), the MAX6865UK35D4S+T's watchdog timer is disabled and does not count. The timer resumes counting only after RESET deasserts. It clears on any WDI edge (rising or falling), MR assertion, or RESET assertion - ensuring reliable recovery from software hangs without false timeouts during reset sequences.
What is the minimum VCC voltage at which the MAX6865UK35D4S+T guarantees valid RESET output?
The MAX6865UK35D4S+T guarantees valid RESET output down to VCC = +1.1V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Below this voltage, RESET behavior is not guaranteed - a critical design margin for battery-powered systems experiencing gradual discharge.
Can the MAX6865UK35D4S+T be used with a 1.8V microprocessor supply?
Yes, the MAX6865UK35D4S+T supports VCC from 1.2V to 5.5V and delivers valid RESET output (VOH ≥ 0.8×VCC, VOL ≤ 0.3V) across this range. At 1.8V supply, its active-high push-pull RESET meets standard 1.8V logic thresholds, enabling direct connection to 1.8V µP reset pins without level-shifting circuitry.
MAX6865UK35D4S+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:
- 3.5V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 1.2s Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK35D4S+T FAQ
1.How can I place an order for MAX6865UK35D4S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK35D4S+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 MAX6865UK35D4S+T reliable?
The price and inventory of MAX6865UK35D4S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK35D4S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK35D4S+T?
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Once your MAX6865UK35D4S+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 MAX6865UK35D4S+T?
For technical support, including MAX6865UK35D4S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK35D4S+T requirements.
6.How does Aetrix verify that MAX6865UK35D4S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK35D4S+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 MAX6865UK35D4S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK35D4S+T?
All MAX6865UK35D4S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK35D4S+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 MAX6865UK35D4S+T part is unused and in its original packaging.
Return procedure for MAX6865UK35D4S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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