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Analog Devices Inc./Maxim Integrated MAX6865UK41D1S+T
- Part No.:
- MAX6865UK41D1S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK41D1S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,207
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Product details
Overview
The MAX6865UK41D1S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 4.1V reset threshold (±2.5%), 10ms minimum reset timeout, and integrated watchdog timer with 3.3s typical timeout. 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 battery-powered medical sensors.
For engineers reviewing the MAX6865UK41D1S+T datasheet, MAX6865UK41D1S+T pinout, MAX6865UK41D1S+T application, or MAX6865UK41D1S+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 integrates voltage monitoring, manual reset input (MR), and watchdog timer (WDI) in a single BiCMOS IC. The watchdog clears on any WDI edge and expires if WDI remains static >3.3s (typ), triggering a 10ms (min) reset pulse. RESET is active-high push-pull, referenced to VCC, with VOH ≥ 0.8×VCC at ISOURCE = 500µA.
Voltage supervision uses a precision bandgap reference with ±2.5% threshold tolerance over –40°C to +85°C. The internal reset timeout generator ensures minimum 10ms assertion after VCC rises above VTH or MR deasserts, with tRD < 40µs for fast response to supply dips.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at VCC = 1.8V; enables >10-year battery life in coin-cell–powered devices. |
| Reset Threshold | 4.100V ±2.5%; factory-trimmed for precise brownout detection at nominal 4.1V rail. |
| Reset Timeout | 10ms min; ensures µP completes power-up initialization before release from reset. |
| Watchdog Timeout | 3.3s typ (S-suffix); detects firmware hangs in low-duty-cycle embedded applications. |
| VCC Validity Range | Operates down to VCC = +1.1V; guarantees valid RESET assertion during deep brownout. |
| MR Glitch Rejection | 200ns; rejects noise spikes on manual reset line without external filtering. |
| WDI Pulse Width | 150ns min; supports high-frequency watchdog toggling in real-time firmware loops. |
Pinout & Package
Package: 5-pin SOT23 (lead-free, +T suffix), footprint-compatible with industry-standard 5-lead SOT-23.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output; drives µP reset input directly without pullup; VOH ≥ 0.8×VCC. |
| 2 | GND | Ground reference for all internal circuits; must connect to system ground plane. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; accepts CMOS logic levels. |
| 4 | WDI | Watchdog input; edge-sensitive; clears internal timer on rising/falling edges; immune to <150ns pulses. |
| 5 | VCC | Supply voltage input (1.2V–5.5V); monitored for reset generation; bypass with 0.1µF to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current extends battery life in always-on medical wearables. |
| Guaranteed VCC = +1.1V operation | Ensures reliable reset assertion even during severe brownout conditions. |
| No external components required | Integrates MR pullup, watchdog timing, and precision voltage reference - no capacitors or resistors needed. |
| Immunity to short VCC transients | Rejects ≤40µs glitches at 100mV overdrive, eliminating false resets in noisy power environments. |
| Watchdog edge-triggered clear | WDI transitions (not level) reset timer, enabling robust software-based heartbeat signaling. |
Applications
| Glucose Monitors | Patient Vital Sign Loggers |
|---|---|
Use Scenario: Continuous glucose sensing with Bluetooth LE transmission every 5 minutes, powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output; triggers reset on brownout or firmware hang detected via WDI toggling. Use Value: Prevents corrupted sensor readings or missed BLE packets by ensuring deterministic µP restart within 10ms of fault detection. |
Use Scenario: Portable ECG/SpO₂ recorder operating 72h on single AA alkaline cell, with periodic flash writes. IC Role / Device Role / Timing Role: Monitors 1.8V core rail; asserts RESET if VCC drops below 1.71V or WDI stalls >3.3s during flash programming. Use Value: Guarantees data integrity by halting write operations and forcing safe reboot before memory corruption occurs. |
| Wireless Sensor Nodes | Low-Power Industrial Transmitters |
Use Scenario: LoRaWAN soil moisture node sleeping >99.9% of time, waking hourly to sample and transmit. IC Role / Device Role / Timing Role: Provides power-on reset and watchdog supervision of sleep/wake state machine; MR used for field firmware recovery. Use Value: Eliminates need for external RC reset network, reducing BOM count and PCB area in 8mm × 8mm modules. |
Use Scenario: 4–20mA loop-powered temperature transmitter with HART modulation, operating at -40°C ambient. IC Role / Device Role / Timing Role: Supervises 5.0V isolated supply; detects brownout during lightning-induced transients; WDI tied to HART modem activity. Use Value: Maintains functional safety by asserting reset within 40µs of VCC dip, preventing erroneous current output during fault. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK41D1S+T | No CT pin; fixed 10ms timeout (D1); identical VTH, WDI, and RESET specs. | Lacks pin-selectable timeout; suitable where only one timeout is required. | Choose MAX6864UK41D1S+T when CT functionality is unused and cost minimization is prioritized. |
| TPS3836K33DBVR | 3.3V fixed threshold; 200ms timeout; no watchdog; 1.5µA ICC; SOT23-5. | Designed for simpler reset-only use cases without firmware supervision. | Choose TPS3836K33DBVR only if watchdog is unnecessary and 3.3V threshold matches system rail. |
Compared with MAX6864UK41D1S+T, the MAX6865UK41D1S+T offers identical supervision and watchdog performance but adds CT pin flexibility - though unused here, it enables future design reuse. Versus TPS3836K33DBVR, MAX6865UK41D1S+T delivers 10× lower ICC and critical watchdog capability for autonomous recovery.
Availability
MAX6865UK41D1S+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign loggers, and wireless sensor nodes requiring stable component supply across extended production lifecycles.
Supply support for MAX6865UK41D1S+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 MAX68xx family targets ultra-low-power microprocessor supervision in battery-critical systems, emphasizing nanoscale ICC, wide VCC range, and integrated watchdog for firmware reliability.
FAQ
What is the exact reset threshold voltage of the MAX6865UK41D1S+T?
The MAX6865UK41D1S+T has a factory-trimmed reset threshold of 4.100V with ±2.5% tolerance over –40°C to +85°C, corresponding to the "41" suffix per Table 2 in the datasheet. This value is guaranteed at VCC ≥ 1.2V and ensures reliable brownout detection on 4.1V nominal rails.
Does the MAX6865UK41D1S+T require external components for basic operation?
No, the MAX6865UK41D1S+T requires no external components for core functionality: MR is internally pulled up to VCC via 10kΩ, the watchdog timer and reset timeout are fully integrated, and the precision voltage reference is on-die. Only a 0.1µF VCC bypass capacitor is recommended for noise immunity.
How does the watchdog timer in the MAX6865UK41D1S+T respond to firmware activity?
The MAX6865UK41D1S+T watchdog timer clears on any rising or falling edge at the WDI pin and expires only if WDI remains static for >3.3s (typ). It does not monitor level duration - edge-triggered clearing prevents false timeouts during long steady-state firmware states like idle loops.
What is the minimum VCC voltage at which the MAX6865UK41D1S+T guarantees valid RESET assertion?
The MAX6865UK41D1S+T guarantees valid RESET assertion down to VCC = +1.1V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Below this, RESET behavior is not characterized, but the device remains functional until VCC drops below 1.2V.
Is the MAX6865UK41D1S+T pin-compatible with other devices in the MAX68xx family?
Yes, the MAX6865UK41D1S+T shares the same 5-pin SOT23 pinout as MAX6864/MAX6866/MAX6867–MAX6869 variants. Pin 1 is RESET (active-high push-pull), Pin 3 is MR, Pin 4 is WDI, and Pin 5 is VCC - matching the MAX6864UK41D1S+T exactly.
MAX6865UK41D1S+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:
- 4.1V
- 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
MAX6865UK41D1S+T FAQ
1.How can I place an order for MAX6865UK41D1S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK41D1S+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 MAX6865UK41D1S+T reliable?
The price and inventory of MAX6865UK41D1S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK41D1S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK41D1S+T?
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MAX6865UK41D1S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK41D1S+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 MAX6865UK41D1S+T?
For technical support, including MAX6865UK41D1S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK41D1S+T requirements.
6.How does Aetrix verify that MAX6865UK41D1S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK41D1S+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 MAX6865UK41D1S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK41D1S+T?
All MAX6865UK41D1S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK41D1S+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 MAX6865UK41D1S+T part is unused and in its original packaging.
Return procedure for MAX6865UK41D1S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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