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Analog Devices Inc./Maxim Integrated MAX6865UK25D1L+T
- Part No.:
- MAX6865UK25D1L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK25D1L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,650
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Product details
Overview
The MAX6865UK25D1L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 2.5V reset threshold (±2.5%), 10ms minimum reset timeout, and integrated watchdog timer with 209s typical timeout. It monitors VCC, responds to manual reset (MR), and asserts active-high push-pull RESET during brownout, power-up, or watchdog expiry - used in battery-powered glucose monitors and portable medical devices.
For engineers reviewing the MAX6865UK25D1L+T datasheet, MAX6865UK25D1L+T pinout, MAX6865UK25D1L+T application, or MAX6865UK25D1L+T equivalent, key selection criteria include guaranteed RESET validity down to VCC = +1.1V, immunity to sub-40µs VCC transients, MR glitch rejection of 200ns, and compatibility with 1.2V–5.5V supply rails in space-constrained portable systems.
Technical Context
This device implements a precision bandgap-based voltage monitor with 0.5% hysteresis, a digital watchdog timer that clears on any WDI edge (rising or falling), and a fixed 10ms internal reset timeout counter. The MR input features 10kΩ internal pullup and 1µs minimum pulse width requirement.
RESET assertion is synchronized to VCC crossing the threshold, with tRD < 40µs and guaranteed low-voltage operation to 1.1V. The watchdog timeout (209s typ) exhibits ±25% variation over temperature, and the device draws only 7–15µA when RESET is asserted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current (typ) | 170nA at VCC = 1.8V - enables >10-year battery life in coin-cell–powered devices |
| Reset Threshold | 2.5V ±2.5% - factory-trimmed for precise brownout detection at 2.5V rail |
| Reset Timeout | 10ms min - ensures µP initialization completes before release from reset |
| Watchdog Timeout | 209s typ (L-suffix) - supports long idle periods in low-power sleep modes |
| VCC Operating Range | 1.2V to 5.5V - compatible with Li-ion, alkaline, and regulated 1.8V/3.3V systems |
| RESET Validity Limit | Down to VCC = +1.1V - guarantees deterministic reset state during deep brownout |
| MR Glitch Rejection | 200ns - suppresses noise-induced false resets in noisy industrial environments |
Pinout & Package
Package: 5-pin SOT23-5, 2.9mm × 1.6mm × 1.1mm, lead-free (RoHS-compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output - drives µP reset pin directly without external pullup; sinks 500µA at VCC ≥ 2.38V |
| 2 | GND | Ground reference - must be connected to system ground plane for noise immunity |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; accepts CMOS logic levels |
| 4 | WDI | Watchdog input - edge-sensitive (150ns min pulse); clears timer on rising/falling transition |
| 5 | VCC | Supply and monitored voltage - requires 0.1µF ceramic bypass capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typ at 1.8V - reduces quiescent drain in always-on monitoring circuits |
| Reset threshold accuracy | ±2.5% over -40°C to +85°C - eliminates need for external calibration in medical-grade designs |
| Watchdog edge sensitivity | Detects 150ns WDI pulses - enables robust software heartbeat signaling without timing margin loss |
| VCC transient immunity | Immune to ≤40µs glitches at 100mV overdrive - prevents spurious resets in automotive or motor-driven systems |
| No external components | Self-contained supervision - no RC networks, pullups, or timing capacitors required |
Applications
| Glucose Monitors | Patient Vital Sign Loggers |
|---|---|
Use Scenario: Continuous glucose sensing with Bluetooth LE transmission during multi-day battery operation. IC Role / Device Role / Timing Role: Supervises 1.8V sensor interface and 3.3V BLE SoC; asserts RESET if VCC drops below 2.5V or firmware hangs. Use Value: 170nA ICC extends CR2032 battery life beyond 18 months; 209s watchdog timeout accommodates extended sleep cycles without false triggers. |
Use Scenario: Portable ECG/SpO₂ recorder with flash memory logging and USB charging. IC Role / Device Role / Timing Role: Monitors main 3.3V rail and initiates hard reset on brownout or software lockup detected via WDI toggling. Use Value: Guaranteed RESET validity to 1.1V ensures safe shutdown before memory corruption; 10ms timeout aligns with µP boot ROM requirements. |
| Industrial Handheld Scanners | Smart Wearable Sensors |
Use Scenario: Rugged barcode scanner powered by rechargeable Li-ion with intermittent high-current laser activation. IC Role / Device Role / Timing Role: Provides VCC supervision and manual reset via button; watchdog guards against firmware freeze during RF interference events. Use Value: 200ns MR glitch rejection prevents accidental reset from ESD-coupled noise; 5.5V max VCC rating supports unregulated battery input. |
Use Scenario: Ultra-thin fitness tracker with optical heart-rate sensor and motion co-processor. IC Role / Device Role / Timing Role: Resets application SoC on undervoltage or missed WDI pulse; operates from 1.2V–3.0V coin cell supply. Use Value: 1.2V min operating voltage enables use with aging batteries; SOT23-5 footprint fits sub-100mm² PCB area constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK25D1L+T | Same 2.5V threshold, 10ms timeout, and 209s watchdog, but outputs active-low push-pull RESET | Requires inverted reset logic on µP side; incompatible with active-high reset inputs | Select MAX6864UK25D1L+T only when target µP accepts active-low RESET |
| TPS3836K25DBVR | 2.5V threshold, 200ms timeout (fixed), no watchdog, 1.6µA ICC, SOT23-5 | Lacks watchdog functionality; higher supply current limits battery lifetime in always-on use | Choose TPS3836K25DBVR only for cost-sensitive, non-watchdog applications where 200ms timeout is acceptable |
Compared with MAX6864UK25D1L+T, the MAX6865UK25D1L+T provides active-high RESET compatibility without level-shifting, while TPS3836K25DBVR trades off watchdog capability and ultra-low current for lower unit cost and simpler qualification.
Availability
MAX6865UK25D1L+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered wearables, and industrial handheld scanners requiring stable component supply across extended production lifecycles.
Supply support for MAX6865UK25D1L+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 supervision for battery-critical systems, emphasizing ultra-low ICC, wide VCC range, and integrated watchdog functionality - targeting portable healthcare and IoT edge nodes.
FAQ
What is the exact reset threshold voltage of the MAX6865UK25D1L+T?
The MAX6865UK25D1L+T has a factory-trimmed reset threshold of 2.500V with ±2.5% tolerance over -40°C to +85°C, as specified in Table 2 (suffix "25") and confirmed in the Electrical Characteristics table under VTH parameter. This value is measured at VCC falling and applies across the full operating temperature range.
Does the MAX6865UK25D1L+T require an external pullup resistor on the RESET pin?
No, the MAX6865UK25D1L+T uses an active-high push-pull RESET output, which actively drives high and low without external components. Unlike open-drain variants, it does not require a pullup resistor - simplifying layout and reducing BOM count.
What is the watchdog timeout behavior when the WDI pin is left floating?
If WDI is left floating on the MAX6865UK25D1L+T, it will drift to an indeterminate state, likely causing the watchdog timer to expire within ~209s (typ), triggering a reset. The datasheet specifies WDI must be driven with clean edges; unused WDI should be tied to VCC or GND, not left floating.
Can the MAX6865UK25D1L+T operate from a 1.2V supply?
Yes, the MAX6865UK25D1L+T operates from VCC = 1.2V to 5.5V per Absolute Maximum Ratings and Electrical Characteristics. However, RESET output high-level voltage (VOH) is specified only down to VCC ≥ 1.71V, and guaranteed RESET validity extends to VCC = +1.1V - enabling functional supervision even below 1.2V during brownout.
How does the MR input behave when not used in the MAX6865UK25D1L+T?
When unused, the MR input of the MAX6865UK25D1L+T should be left unconnected or tied to VCC, as it features an internal 10kΩ pullup to VCC. Leaving MR floating is not recommended due to noise susceptibility; tying to VCC ensures reliable deassertion and avoids unintended resets.
MAX6865UK25D1L+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:
- 2.5V
- 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
MAX6865UK25D1L+T FAQ
1.How can I place an order for MAX6865UK25D1L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK25D1L+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 MAX6865UK25D1L+T reliable?
The price and inventory of MAX6865UK25D1L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK25D1L+T is usually 5 days.
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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 MAX6865UK25D1L+T?
For technical support, including MAX6865UK25D1L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK25D1L+T requirements.
6.How does Aetrix verify that MAX6865UK25D1L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK25D1L+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 MAX6865UK25D1L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK25D1L+T?
All MAX6865UK25D1L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK25D1L+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 MAX6865UK25D1L+T part is unused and in its original packaging.
Return procedure for MAX6865UK25D1L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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