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Analog Devices Inc./Maxim Integrated MAX6865UK44D3S+T
- Part No.:
- MAX6865UK44D3S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK44D3S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,136
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Product details
Overview
MAX6865UK44D3S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 4.266V reset threshold (±2.5%), 150ms minimum reset timeout, manual reset input (MR), and watchdog timer with 3.3s typical timeout. It ensures reliable system reset during power-up, brownout, or software lockup in battery-powered medical and portable electronics.
For engineers reviewing the MAX6865UK44D3S+T datasheet, MAX6865UK44D3S+T pinout, MAX6865UK44D3S+T application, or MAX6865UK44D3S+T equivalent, key selection criteria include its guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), push-pull active-high RESET output, and compatibility with 1.2V–5.5V supply rails.
Technical Context
The MAX6865UK44D3S+T integrates voltage monitoring, manual reset assertion, and watchdog timer functionality in a single BiCMOS IC. Its reset logic asserts RESET high when VCC falls below 4.266V, MR is pulled low, or WDI remains static beyond 3.3s - with internal timing ensuring minimum 150ms reset pulse width after recovery.
Watchdog operation clears on any WDI edge (rising/falling), MR assertion, or RESET activation; it resumes counting only after RESET deasserts. The device uses no external components and guarantees valid reset output across -40°C to +85°C operating temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at +25°C - enables multi-year battery life in always-on portable devices |
| Reset Threshold Voltage | 4.266V (min 4.193V, max 4.408V) - precisely matches 4.3V nominal rail systems |
| Reset Timeout Period | 150ms min (D3 option) - provides sufficient time for µP initialization and clock stabilization |
| Watchdog Timeout | 3.3s typ (S suffix) - balances fault detection responsiveness with software execution margin |
| VCC Operating Range | 1.2V to 5.5V - supports wide-input battery-powered designs including Li-ion and coin-cell systems |
| Reset Output Type | Push-pull active-high - eliminates need for external pullup and ensures clean logic-level drive |
| Guaranteed Reset Validity | Down to VCC = +1.1V - maintains deterministic reset state during deep brownout conditions |
Pinout & Package
MAX6865UK44D3S+T is housed in a lead-free 5-pin SOT23-5 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained portable PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives high during fault condition; sinks/source up to 1.2mA |
| 2 | GND | Ground reference - must be connected to system ground plane for noise immunity and timing accuracy |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; accepts CMOS-compatible logic levels |
| 4 | WDI | Watchdog input - detects edges ≥150ns wide; resets internal timer on each transition |
| 5 | VCC | Supply voltage input - monitors own power rail; requires 0.1µF bypass capacitor to GND for stability |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in glucose monitors and wearables |
| Factory-trimmed VTH | 4.266V ±2.5% threshold eliminates external resistor network and calibration effort |
| Watchdog immunity | Clears on any WDI edge - prevents false timeouts during periodic I/O toggling in firmware |
| VCC transient rejection | Immune to ≤40µs VCC glitches at 100mV overdrive - avoids spurious resets in noisy environments |
| No external components | Self-contained supervision - reduces BOM count, layout area, and qualification testing scope |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission and low-power sleep cycles. IC Role / Device Role / Timing Role: Supervises main µP power rail and triggers hard reset if firmware hangs during sensor sampling or radio handshake. Use Value: Prevents undetected sensor data corruption or missed alarms by enforcing deterministic restart within 150ms of watchdog timeout. |
Use Scenario: Portable ECG/SpO₂ units operating from single AAA battery with 5-year shelf life requirement. IC Role / Device Role / Timing Role: Monitors 3.3V system rail and asserts active-high RESET to initialize analog front-end and display controller on power-up and brownout. Use Value: Guarantees valid reset down to VCC = +1.1V, enabling safe shutdown before battery depletion causes memory corruption. |
| MP3 Players | Smart Pagers |
Use Scenario: Flash-based audio player with USB charging and button-driven UI requiring glitch-free reset on wake-from-sleep. IC Role / Device Role / Timing Role: Provides manual reset via momentary switch on MR pin and monitors 1.8V core rail for brownout detection. Use Value: Internal 10kΩ MR pullup eliminates external resistor; 170nA ICC extends playback time between charges. |
Use Scenario: Two-way messaging pager with persistent memory and real-time clock, powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Watches µP activity via WDI and asserts RESET if message processing stalls due to RF interference or memory error. Use Value: 3.3s watchdog timeout allows full protocol stack execution while catching infinite loops before battery drain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K33DBVR | 3.3V fixed reset threshold; no watchdog; 200ms timeout; open-drain output | Lacks WDI monitoring - suitable only for basic voltage supervision without software fault coverage | Select when cost sensitivity outweighs need for watchdog protection and active-high drive |
| MAX6361KA29D3+T | 2.93V reset threshold; 150ms timeout; no watchdog; push-pull active-low output | Lower VTH and inverted RESET polarity require schematic revision and firmware adaptation | Choose only if existing design already uses MAX6361 footprint and logic-level inversion is acceptable |
Compared with TPS3837K33DBVR and MAX6361KA29D3+T, the MAX6865UK44D3S+T uniquely combines 4.266V precision threshold, active-high push-pull RESET, and integrated 3.3s watchdog - delivering complete supervision in one chip without layout or firmware changes required for those alternatives.
Availability
MAX6865UK44D3S+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, MP3 players, and smart pagers requiring stable component supply, long-term lifecycle support, and lead-free compliance.
Supply support for MAX6865UK44D3S+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 consumer markets.
The MAX68xx family delivers nanopower supervision for battery-critical systems - engineered specifically for portable medical devices and ultra-low-power embedded controllers where runtime and reliability are non-negotiable.
FAQ
What is the exact reset threshold voltage of MAX6865UK44D3S+T?
The MAX6865UK44D3S+T has a factory-trimmed reset threshold of 4.266V, with guaranteed tolerance of ±2.5% (4.193V to 4.408V) over -40°C to +85°C. This value corresponds to the "44" suffix in the part number per Maxim's Threshold Suffix Guide, and is measured during VCC fall condition.
Does MAX6865UK44D3S+T support active-high or active-low reset output?
The MAX6865UK44D3S+T features a push-pull active-high RESET output (pin 1), meaning it drives high during reset assertion and low when deasserted. This eliminates the need for an external pullup resistor and ensures robust logic-level compatibility with µPs requiring active-high reset signals.
What is the watchdog timeout behavior of MAX6865UK44D3S+T?
The MAX6865UK44D3S+T implements a 3.3s typical watchdog timeout (S suffix), clearing its internal timer on any rising or falling edge at WDI (pin 4). If WDI remains static beyond this period, RESET asserts for the configured 150ms minimum timeout - providing reliable software lockup detection without requiring precise pulse timing.
Can MAX6865UK44D3S+T operate down to 1.2V supply voltage?
Yes, the MAX6865UK44D3S+T operates across 1.2V to 5.5V VCC, and its reset function remains guaranteed down to VCC = +1.1V. At 1.2V, it draws only ~190nA typical supply current and maintains valid RESET output - making it suitable for single-cell Li-ion and alkaline battery systems.
Is MAX6865UK44D3S+T pin-compatible with other MAX68xx devices?
The MAX6865UK44D3S+T shares the same 5-pin SOT23-5 package and pinout (RESET, GND, MR, WDI, VCC) with MAX6864/MAX6866 variants. However, it is not pin-compatible with MAX6861–MAX6863 (which use CT instead of WDI) or MAX6854–MAX6856 (which lack WDI), requiring PCB layout verification for substitution.
MAX6865UK44D3S+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:
- 4.375V
- 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
MAX6865UK44D3S+T FAQ
1.How can I place an order for MAX6865UK44D3S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK44D3S+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 MAX6865UK44D3S+T reliable?
The price and inventory of MAX6865UK44D3S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK44D3S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK44D3S+T?
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4.How is shipping managed for MAX6865UK44D3S+T?
MAX6865UK44D3S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK44D3S+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 MAX6865UK44D3S+T?
For technical support, including MAX6865UK44D3S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK44D3S+T requirements.
6.How does Aetrix verify that MAX6865UK44D3S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK44D3S+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 MAX6865UK44D3S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK44D3S+T?
All MAX6865UK44D3S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK44D3S+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 MAX6865UK44D3S+T part is unused and in its original packaging.
Return procedure for MAX6865UK44D3S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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