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Analog Devices Inc./Maxim Integrated MAX6865UK36D5L+T
- Part No.:
- MAX6865UK36D5L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK36D5L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,967
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Product details
Overview
The MAX6865UK36D5L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 3.6V reset threshold (±2.5%), 300ms 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 expiration - used in battery-powered medical and portable electronics.
For engineers reviewing the MAX6865UK36D5L+T datasheet, MAX6865UK36D5L+T pinout, MAX6865UK36D5L+T application, or MAX6865UK36D5L+T equivalent, key selection criteria include guaranteed RESET validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), pin-selectable reset timing options, and compatibility with low-voltage µP systems requiring long watchdog intervals and minimal quiescent current.
Technical Context
This device integrates voltage monitoring, manual reset input (MR), and watchdog timer logic into a single BiCMOS IC. The watchdog monitors WDI transitions and expires if no edge occurs within 209s (typ), triggering a 300ms (min) active-high RESET pulse referenced to VCC.
Reset assertion is triggered by VCC falling below 3.6V, MR pulled low, or watchdog timeout - with hysteresis of 0.5%VTH and guaranteed operation across –40°C to +85°C. The push-pull RESET output delivers VOH ≥ 0.8×VCC at ISOURCE = 500µA and VOL ≤ 0.3V at ISINK = 1.2mA (VCC ≥ 2.38V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at VCC = 1.8V; enables multi-year battery life in always-on portable devices |
| Reset Threshold Voltage | 3.600V ±2.5% (VTH = 3.6V); factory-trimmed for precise brownout detection on 3.3V rails |
| Reset Timeout Period | 300ms min (D5 option); ensures µP completes full initialization before release |
| Watchdog Timeout | 209s typ (L suffix); supports long-loop firmware without spurious resets |
| RESET Output Type | Active-high push-pull; eliminates external pullup and simplifies interface to 3.3V/1.8V µP reset inputs |
| VCC Operating Range | 1.2V to 5.5V; valid RESET assertion guaranteed down to VCC = +1.1V for robust low-voltage operation |
| MR Input Logic | Active-low with 10kΩ internal pullup; accepts CMOS levels and requires no external components |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, footprint compatible with industry-standard 5-pin supervisory ICs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output; drives µP reset input directly without pullup resistor |
| 2 | GND | Ground reference for all internal circuits and reset timing; must connect to system ground plane |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC; debounced via 10kΩ and 250ns glitch rejection |
| 4 | WDI | Watchdog input; detects rising/falling edges; clears internal timer on each transition; immune to <150ns pulses |
| 5 | VCC | Supply voltage input and monitored rail; requires 0.1µF bypass capacitor to GND for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in glucose monitors and wearables |
| Guaranteed RESET validity to VCC = +1.1V | Ensures deterministic reset behavior during deep brownout, critical for safety-critical medical devices |
| Watchdog timeout stability | 209s typ with <±25% variation over –40°C to +85°C; avoids false resets in temperature-variable environments |
| No external components required | Integrates MR pullup, timing capacitors, and reset generator - reduces BOM count and PCB area |
| Immunity to short VCC transients | Rejects <40µs glitches at 100mV overdrive; prevents spurious resets in noisy automotive or industrial power rails |
Applications
| Portable Medical Devices | Battery-Powered IoT Sensors |
|---|---|
Use Scenario: Continuous glucose monitoring (CGM) patch worn for 14 days on coin-cell power. IC Role / Device Role / Timing Role: Supervises 3.3V system rail, triggers reset on brownout or firmware hang, and provides 209s watchdog window aligned with sensor sampling interval. Use Value: Prevents undetected firmware lockup during critical measurement cycles while extending battery life beyond 2000 hours. |
Use Scenario: Remote environmental sensor node transmitting data every 5 minutes via LoRaWAN. IC Role / Device Role / Timing Role: Monitors VCC during wake-up bursts; asserts RESET if MCU fails to toggle WDI within 209s due to RF interference or memory corruption. Use Value: Enables autonomous recovery without field service, reducing maintenance cost and improving data continuity. |
| Industrial Handheld Terminals | Low-Power Wearables |
Use Scenario: Ruggedized barcode scanner operating in warehouses with unstable 3.3V DC-DC output. IC Role / Device Role / Timing Role: Detects VCC droop below 3.6V during motor startup transients and holds RESET for 300ms to prevent partial boot. Use Value: Eliminates boot failures caused by brief supply sags, increasing first-time success rate to >99.98%. |
Use Scenario: Fitness tracker with heart-rate sensor and BLE radio powered by 30mAh LiPo cell. IC Role / Device Role / Timing Role: Provides active-high RESET compatible with BLE SoC reset pin; draws only 170nA to preserve sleep-mode current budget. Use Value: Reduces average system sleep current by 0.2µA versus legacy supervisors, adding ~3 days runtime per charge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK36D5S+T | Same 3.6V threshold and D5 (300ms) timeout, but 3.3s watchdog (S suffix) instead of 209s (L) | Suitable for fast-recovery embedded control loops where shorter watchdog windows reduce fault latency | Select when firmware execution time is bounded under 2s and rapid fault detection is prioritized over battery savings |
| TPS3837K33DBVR | 3.08V fixed threshold, 200ms reset timeout, no watchdog; 1.6µA ICC - 10× higher than MAX6865UK36D5L+T | Designed for cost-sensitive industrial controllers where watchdog functionality is handled separately | Choose only if system already implements external watchdog logic and ultra-low ICC is not required |
Compared with MAX6864UK36D5S+T and TPS3837K33DBVR, the MAX6865UK36D5L+T uniquely balances ultra-low 170nA current, long 209s watchdog, and precise 3.6V threshold - making it optimal for battery-constrained medical and portable devices needing both reliability and multi-year runtime.
Availability
MAX6865UK36D5L+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered IoT sensors, industrial handheld terminals, and low-power wearables requiring stable component supply across extended production lifecycles.
Supply support for MAX6865UK36D5L+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 MAX6854–MAX6869 family was engineered specifically for nanopower supervisory functions in space- and energy-constrained portable electronics, emphasizing ultra-low ICC, wide VCC range, and integrated watchdog capability.
FAQ
What is the exact reset threshold voltage of the MAX6865UK36D5L+T?
The MAX6865UK36D5L+T has a factory-trimmed reset threshold of 3.600V with ±2.5% tolerance over temperature (–40°C to +85°C), corresponding to the "36" suffix in the part number per Maxim's Threshold Suffix Guide. This value is verified in the Electrical Characteristics table under VTH parameter.
Does the MAX6865UK36D5L+T require an external pullup resistor on the RESET pin?
No. The MAX6865UK36D5L+T features an active-high push-pull RESET output, which actively drives high and low without requiring an external pullup resistor. This simplifies design and reduces component count compared to open-drain alternatives.
What is the watchdog timeout behavior of the MAX6865UK36D5L+T?
The MAX6865UK36D5L+T uses the "L" watchdog suffix, providing a typical timeout of 209s (min 95s, max 487s). The internal watchdog timer clears on any WDI edge (rising or falling) and expires only if WDI remains static longer than this period, triggering a 300ms (min) RESET pulse.
Can the MAX6865UK36D5L+T operate reliably below 1.8V?
Yes. The MAX6865UK36D5L+T operates across VCC = 1.2V to 5.5V and guarantees valid RESET assertion down to VCC = +1.1V. Its 170nA typical supply current at 1.8V and functional reset at 1.2V make it suitable for ultra-low-voltage applications such as coin-cell-powered devices.
How does the MR input function on the MAX6865UK36D5L+T?
The MR input on the MAX6865UK36D5L+T is active-low with an internal 10kΩ pullup to VCC. Driving MR low initiates a reset that persists for the full 300ms timeout after MR returns high. It accepts CMOS logic levels and rejects glitches <200ns, eliminating need for external debounce circuitry.
MAX6865UK36D5L+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:
- 3.6V
- 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
MAX6865UK36D5L+T FAQ
1.How can I place an order for MAX6865UK36D5L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK36D5L+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 MAX6865UK36D5L+T reliable?
The price and inventory of MAX6865UK36D5L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK36D5L+T is usually 5 days.
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Once your MAX6865UK36D5L+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 MAX6865UK36D5L+T?
For technical support, including MAX6865UK36D5L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK36D5L+T requirements.
6.How does Aetrix verify that MAX6865UK36D5L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK36D5L+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 MAX6865UK36D5L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK36D5L+T?
All MAX6865UK36D5L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK36D5L+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 MAX6865UK36D5L+T part is unused and in its original packaging.
Return procedure for MAX6865UK36D5L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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