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Analog Devices Inc./Maxim Integrated MAX6865UK38D6L+T
- Part No.:
- MAX6865UK38D6L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK38D6L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,393
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Product details
Overview
The MAX6865UK38D6L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, combining voltage monitoring, manual reset input (MR), and watchdog timer (WDI) functions. It asserts an active-low push-pull RESET output when VCC drops below 3.705V (typ), MR is pulled low, or the watchdog expires after 209s (typ). Designed for ultra-low-power systems, it draws only 170nA (typ) supply current and guarantees valid reset down to VCC = +1.1V.
For engineers reviewing the MAX6865UK38D6L+T datasheet, MAX6865UK38D6L+T pinout, MAX6865UK38D6L+T application, or MAX6865UK38D6L+T equivalent, this device serves as a critical power-on reset and fault recovery element in battery-constrained embedded systems where supply stability, long watchdog intervals, and minimal quiescent current are mandatory design requirements.
Technical Context
The MAX6865UK38D6L+T implements a precision bandgap-based voltage monitor with ±2.5% threshold accuracy over temperature, paired with a digitally timed watchdog that clears on any WDI edge and times out after 209s (typ) if inactive. Its internal 10kΩ MR pullup and glitch-immune timing logic eliminate external components while supporting noise-robust manual reset initiation.
This variant belongs to the MAX6864–MAX6869 series featuring active-high push-pull RESET output, factory-trimmed 3.705V reset threshold (suffix "38"), 1200ms minimum reset timeout (suffix "D6"), and long watchdog interval (suffix "L"). It operates across –40°C to +85°C and requires no external capacitor for basic functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 3.705V (typ), ±2.5% tolerance - ensures reliable brownout detection at 3.3V system rails with margin |
| Supply Current | 170nA (typ) at VCC = 1.8V - enables multi-year operation on coin-cell batteries |
| Reset Timeout Period | 600ms to 1200ms (min), D6 option - provides sufficient hold time for slow-starting µPs and peripherals |
| Watchdog Timeout | 209s (typ), L-suffix - supports long-cycle firmware tasks without spurious resets |
| Operating Voltage Range | 1.2V to 5.5V - compatible with 1.8V, 2.5V, 3.3V, and 5V logic domains |
| Reset Valid Down To | VCC = +1.1V - guarantees deterministic reset assertion during deep brownout |
| MR Input Pullup | 10kΩ internal - eliminates need for external resistor in manual reset switch interface |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, footprint-compatible with industry-standard 5-lead SOT packages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives high during reset assertion; no external pullup required |
| 2 | GND | Ground reference - must be connected to system ground plane for stable threshold and timing |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC; accepts CMOS-level signals or momentary switch to GND |
| 4 | WDI | Watchdog input - edge-sensitive; clears internal timer on rising or falling transition; immune to <150ns pulses |
| 5 | VCC | Supply voltage input - monitored for reset generation; bypass with 0.1µF ceramic capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in always-on medical sensors |
| Guaranteed reset validity | RESET remains functional down to VCC = +1.1V - prevents undefined µP state during deep undervoltage |
| No external components | Integrated 10kΩ MR pullup, precision voltage reference, and RC-free timing eliminate BOM cost and layout area |
| Watchdog immunity | Clears on any WDI edge (rising/falling); rejects glitches <200ns - avoids false timeouts from EMI or software jitter |
| Transient immunity | Immune to VCC transients ≤40µs at 100mV overdrive - suppresses noise-induced false resets in noisy environments |
Applications
| Portable Glucose Monitor | Wearable Patient Vital Sign Logger |
|---|---|
Use Scenario: Continuous subcutaneous glucose sensing with Bluetooth LE transmission every 5 minutes. IC Role / Device Role / Timing Role: Supervises 3.3V rail and monitors firmware liveness via WDI; asserts RESET if sensor readout or radio stack hangs. Use Value: 209s watchdog timeout aligns with BLE connection interval; 170nA ICC extends CR2032 battery life beyond 2 years. |
Use Scenario: Ambulatory ECG/SpO₂ recorder sampling at 125Hz, storing data to internal flash, transmitting hourly. IC Role / Device Role / Timing Role: Provides power-on reset and detects firmware lockup during flash write or BLE advertising cycles. Use Value: 3.705V threshold ensures reset before 3.3V LDO dropout; 1200ms reset timeout accommodates slow flash initialization. |
| Industrial Wireless Sensor Node | Low-Power Smart Meter Module |
Use Scenario: LoRaWAN node measuring temperature/humidity, sleeping >99.9% of time, waking hourly. IC Role / Device Role / Timing Role: Monitors primary 3.6V lithium-thionyl chloride cell and validates µP wake-up sequence integrity. Use Value: 170nA ICC minimizes sleep-current penalty; 209s watchdog covers full measurement + transmit cycle without false triggers. |
Use Scenario: AMI meter with real-time clock, metrology ASIC, and PLC communication, operating from 3.6V primary battery. IC Role / Device Role / Timing Role: Ensures clean power-up of metrology chain and recovers from PLC firmware stalls during firmware updates. Use Value: 3.705V threshold matches battery end-of-life voltage; 1200ms reset timeout allows RTC synchronization and secure boot verification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK38D6L+T | Active-low push-pull RESET output instead of active-high; identical threshold, timeout, and watchdog specs | Requires inverted reset logic on µP side; unsuitable for systems expecting active-high reset assertion | Select when host µP reset pin is active-low and board layout already routes RESET as active-low signal |
| TPS3838K33DBVR | Fixed 3.08V reset threshold, 200ms timeout, no watchdog; 1.6µA ICC - 10× higher quiescent current | Lacks watchdog functionality and long-interval supervision; insufficient for firmware liveness monitoring | Only consider for cost-sensitive, non-watchdog applications where 3.08V threshold and 200ms timeout meet requirements |
Compared with MAX6864UK38D6L+T, the MAX6865UK38D6L+T provides native active-high reset signaling, simplifying interface to many ARM Cortex-M and RISC-V SoCs. Against TPS3838K33DBVR, it delivers 10× lower ICC and integrated watchdog - essential for unattended, long-life deployments.
Availability
MAX6865UK38D6L+T is available at Aetrix Electronics and suitable for portable medical devices, wearable health monitors, industrial wireless sensors, and smart utility meters requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6865UK38D6L+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, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX6864–MAX6869 family was engineered specifically for ultra-low-power microprocessor supervision in battery-critical systems, integrating voltage monitoring, manual reset, and long-interval watchdog functionality into a single 5-pin SOT23 package.
FAQ
What is the exact reset threshold voltage of the MAX6865UK38D6L+T?
The MAX6865UK38D6L+T has a factory-trimmed reset threshold voltage of 3.705V (typical), with ±2.5% tolerance over –40°C to +85°C. This value is confirmed in Table 2 ("Threshold Suffix Guide") of the datasheet, where suffix "38" corresponds to 3.705V. The device guarantees valid reset assertion down to VCC = +1.1V, making it suitable for systems with gradual battery discharge profiles.
Does the MAX6865UK38D6L+T require external components for basic operation?
No, the MAX6865UK38D6L+T requires no external components for core functionality. It integrates a 10kΩ internal pullup on the MR pin, a precision voltage reference, and RC-free timing circuits for both reset timeout and watchdog functions. A 0.1µF ceramic capacitor from VCC to GND is recommended for noise suppression but not strictly required for specification compliance.
What is the watchdog timeout behavior of the MAX6865UK38D6L+T?
The MAX6865UK38D6L+T features a long-interval watchdog with a typical timeout of 209s (L-suffix), with min/max values of 95s and 487s. The timer clears on any rising or falling edge at the WDI pin and expires only if WDI remains static beyond the timeout period. While reset is asserted, the watchdog timer is halted and resumes counting only after reset deasserts.
How does the MAX6865UK38D6L+T differ from the MAX6864UK38D6L+T?
The MAX6865UK38D6L+T differs from the MAX6864UK38D6L+T solely in reset output polarity: MAX6865UK38D6L+T provides active-high push-pull RESET, while MAX6864UK38D6L+T provides active-low push-pull RESET. All other specifications - including 3.705V threshold, 1200ms reset timeout, 209s watchdog, 170nA ICC, and pinout - are identical between the two parts.
Is the MAX6865UK38D6L+T compatible with 1.8V microcontrollers?
Yes, the MAX6865UK38D6L+T operates from 1.2V to 5.5V and is fully compatible with 1.8V microcontrollers. Its supply current is specified at 170nA (typ) at VCC = 1.8V, and its MR input accepts logic levels referenced to VCC (VIH = 0.7 × VCC, VIL = 0.3 × VCC). The active-high RESET output swings rail-to-rail, ensuring clean logic-level signaling to 1.8V I/O domains.
MAX6865UK38D6L+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:
- 3.8V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 600ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK38D6L+T FAQ
1.How can I place an order for MAX6865UK38D6L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK38D6L+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 MAX6865UK38D6L+T reliable?
The price and inventory of MAX6865UK38D6L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK38D6L+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK38D6L+T?
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4.How is shipping managed for MAX6865UK38D6L+T?
MAX6865UK38D6L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK38D6L+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 MAX6865UK38D6L+T?
For technical support, including MAX6865UK38D6L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK38D6L+T requirements.
6.How does Aetrix verify that MAX6865UK38D6L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK38D6L+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 MAX6865UK38D6L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK38D6L+T?
All MAX6865UK38D6L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK38D6L+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 MAX6865UK38D6L+T part is unused and in its original packaging.
Return procedure for MAX6865UK38D6L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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