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Analog Devices Inc./Maxim Integrated MAX6865UK25D5L+T
- Part No.:
- MAX6865UK25D5L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK25D5L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,612
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Product details
Overview
MAX6865UK25D5L+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%), 600ms minimum reset timeout (D5), and integrated watchdog timer with 209s typical timeout (L suffix). It monitors VCC, responds to manual reset (MR), and asserts active-high push-pull RESET during brownout or watchdog expiry - used in glucose monitors and portable medical devices.
For engineers reviewing the MAX6865UK25D5L+T datasheet, MAX6865UK25D5L+T pinout, MAX6865UK25D5L+T application, or MAX6865UK25D5L+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 battery-constrained systems.
Technical Context
The MAX6865UK25D5L+T implements a dual-monitoring architecture: a precision voltage detector with hysteresis (0.5% of VTH) for VCC supervision and an independent watchdog timer that clears on any WDI edge (min pulse width 150ns). Its BiCMOS process enables stable operation across -40°C to +85°C while maintaining nanoscale quiescent current.
It features internal 10kΩ MR pullup, no external components required, and guarantees valid reset assertion even as VCC falls to 1.1V - critical for low-voltage microcontroller startup integrity. The active-high push-pull RESET output drives directly to VCC without external pullup, simplifying interface with µP reset inputs requiring high-true logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at VCC = 1.8V - enables multi-year battery life in always-on medical sensors |
| Reset Threshold | 2.5V ±2.5% - factory-trimmed for precise brownout detection at common logic rail voltages |
| Reset Timeout | 600ms min (D5 option) - ensures full µP initialization before release from reset |
| Watchdog Timeout | 209s typ (L suffix) - supports long-cycle firmware execution without spurious resets |
| VCC Operating Range | 1.2V to 5.5V - interoperable with 1.8V, 3.3V, and 5V systems without level-shifting |
| RESET Validity | Guaranteed to VCC = +1.1V - maintains deterministic reset state during deep brownout |
| MR Glitch Rejection | 200ns - rejects noise spikes on manual reset line in noisy industrial environments |
Pinout & Package
Package: 5-pin SOT23-5, lead-free (RoHS-compliant), footprint compatible with industry-standard 5-pin SOT23 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives high during fault conditions; no external pullup needed |
| 2 | GND | Ground reference - must be connected to system ground plane for accurate voltage monitoring |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; accepts CMOS-level signals |
| 4 | WDI | Watchdog input - edge-sensitive (rising/falling); clears internal timer on each transition |
| 5 | VCC | Supply voltage input - monitored for reset assertion; bypass with 0.1µF capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in coin-cell-powered devices |
| Reset threshold accuracy | ±2.5% over temperature ensures reliable brownout detection without margin overhead |
| Watchdog immunity | Clears on any WDI edge (150ns min pulse) - prevents false timeouts during normal firmware polling |
| VCC transient immunity | Immune to ≤40µs transients at 100mV overdrive - eliminates nuisance resets in noisy power rails |
| No external components | Integrated MR pullup, precision reference, and timing elements eliminate BOM cost and layout area |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
Use Scenario: Continuous glucose sensing with Bluetooth LE transmission in disposable wearable patches. IC Role / Device Role / Timing Role: Supervises 1.8V MCU supply and validates firmware execution via WDI toggling every 2 seconds. Use Value: 209s watchdog timeout accommodates extended sensor calibration sequences without reset; 170nA ICC extends single-CR2032 battery life beyond 24 months. |
Use Scenario: Portable ECG recorder with flash-based data logging and USB charging. IC Role / Device Role / Timing Role: Monitors 3.3V system rail and asserts active-high RESET to ARM Cortex-M0 during power-up sequencing and brownout events. Use Value: Guaranteed RESET validity to VCC = 1.1V ensures deterministic recovery from deep discharge states during USB power negotiation. |
| Smart Wearable Sensors | Industrial Handheld Terminals |
Use Scenario: Low-power environmental sensor node with LoRaWAN backhaul operating on primary lithium battery. IC Role / Device Role / Timing Role: Provides 2.5V reset threshold supervision and manual reset via tactile button (MR), with 600ms timeout ensuring full RF IC initialization. Use Value: 5-pin SOT23 footprint minimizes PCB area; no external capacitors reduce bill-of-materials and assembly cost. |
Use Scenario: Ruggedized barcode scanner with cold-temperature operation (-20°C) and frequent drop-induced power glitches. IC Role / Device Role / Timing Role: Detects sub-100ms VCC sags caused by motor actuation and asserts RESET for 600ms to prevent corrupted EEPROM writes. Use Value: 200ns MR glitch rejection prevents accidental resets from mechanical switch bounce; 40µs transient immunity suppresses noise from solenoid drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3836K33DBVR | Fixed 3.3V reset threshold; no watchdog; 200ms reset timeout; 1.6µA ICC | Lacks WDI functionality; suited only for basic voltage monitoring without firmware execution validation | Select when watchdog capability is unnecessary and higher supply current is acceptable for cost-sensitive designs |
| MAX6361KA29D3+T | 2.93V reset threshold; no watchdog; 150ms timeout; 1.2µA ICC; same SOT23-5 package | Higher ICC and shorter timeout limit use in ultra-low-power or long-initialization systems | Choose only if exact 2.93V threshold is required and 209s watchdog supervision is not needed |
Compared with TPS3836K33DBVR and MAX6361KA29D3+T, the MAX6865UK25D5L+T uniquely delivers nanopower operation (170nA), programmable watchdog supervision (209s), and precise 2.5V reset threshold - enabling robust, long-life operation in safety-critical portable medical electronics where both voltage and software integrity must be continuously verified.
Availability
MAX6865UK25D5L+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitoring devices, smart wearables, and industrial handheld terminals requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6865UK25D5L+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 connectivity in demanding industrial, medical, and automotive applications.
The MAX6865UK25D5L+T belongs to Maxim's nanopower µP supervisory family, engineered specifically for battery-operated medical and portable electronics requiring ultra-low ICC, guaranteed reset validity at sub-1.2V VCC, and integrated watchdog reliability.
FAQ
What is the exact reset threshold voltage of MAX6865UK25D5L+T?
The MAX6865UK25D5L+T has a factory-trimmed reset threshold of 2.5V with ±2.5% tolerance over -40°C to +85°C. This value is fixed per the "25" suffix in the part number and is specified in the Electrical Characteristics table under VTH. The device guarantees valid reset assertion as VCC falls below this threshold and maintains reset until VCC exceeds it plus hysteresis (0.5% of VTH).
Does MAX6865UK25D5L+T support active-high or active-low reset output?
The MAX6865UK25D5L+T provides an active-high push-pull RESET output (Pin 1), as confirmed by its pin description and functional diagram. When asserted, RESET drives high to VCC; when deasserted, it drives low. This eliminates need for external pullup resistors and simplifies interfacing with microcontrollers requiring high-true reset inputs.
What is the watchdog timeout behavior of MAX6865UK25D5L+T?
The MAX6865UK25D5L+T features a watchdog timer with 209s typical timeout (L suffix), with min/max values of 95s/487s. The timer clears on any rising or falling edge at WDI (Pin 4) and expires only if WDI remains static longer than the timeout period. Upon expiry, it triggers the 600ms reset timeout (D5), asserting RESET high for that duration.
Can MAX6865UK25D5L+T operate reliably below 1.8V supply?
Yes - the MAX6865UK25D5L+T operates from VCC = 1.2V to 5.5V and guarantees valid RESET output down to VCC = +1.1V. At 1.2V, its supply current is 190nA (typ), and RESET remains functional with VOL ≤ 0.3V and VOH ≥ 0.8 × VCC, enabling use in emerging ultra-low-voltage microcontrollers and energy-harvesting systems.
Is MAX6865UK25D5L+T pin-compatible with other supervisory ICs?
The MAX6865UK25D5L+T uses a standard 5-pin SOT23-5 package with Pin 1 = RESET, Pin 2 = GND, Pin 3 = MR, Pin 4 = WDI, Pin 5 = VCC. It is not pin-compatible with TPS3836/TPS3837/TPS3838 (which lack WDI) or MAX6861–MAX6863 (which use CT instead of WDI). Direct replacement requires matching WDI functionality and active-high RESET topology.
MAX6865UK25D5L+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:
- 300ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK25D5L+T FAQ
1.How can I place an order for MAX6865UK25D5L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK25D5L+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 MAX6865UK25D5L+T reliable?
The price and inventory of MAX6865UK25D5L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK25D5L+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK25D5L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK25D5L+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6865UK25D5L+T?
MAX6865UK25D5L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK25D5L+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 MAX6865UK25D5L+T?
For technical support, including MAX6865UK25D5L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK25D5L+T requirements.
6.How does Aetrix verify that MAX6865UK25D5L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK25D5L+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 MAX6865UK25D5L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK25D5L+T?
All MAX6865UK25D5L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK25D5L+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 MAX6865UK25D5L+T part is unused and in its original packaging.
Return procedure for MAX6865UK25D5L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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