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Analog Devices Inc./Maxim Integrated MAX6865UK41D4S+T
- Part No.:
- MAX6865UK41D4S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK41D4S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,263
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Product details
Overview
MAX6865UK41D4S+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%), 1200ms minimum reset timeout, manual reset input (MR), and watchdog timer with 3.3s typical timeout. It monitors VCC in battery-powered portable electronics to ensure reliable µP reset during power-up, brownout, or software hang.
For engineers reviewing the MAX6865UK41D4S+T datasheet, MAX6865UK41D4S+T pinout, MAX6865UK41D4S+T application, or MAX6865UK41D4S+T equivalent, key selection criteria include its guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), push-pull active-high RESET output, and integrated 10kΩ MR pullup - critical for low-power, noise-sensitive embedded systems.
Technical Context
The MAX6865UK41D4S+T implements a dual-trigger reset architecture: it asserts reset when VCC falls below 4.1V, when MR is pulled low, or when the watchdog input (WDI) remains static beyond 3.3s (typ). Its internal watchdog timer clears on any WDI edge, MR assertion, or RESET assertion, enabling robust software execution monitoring.
Reset deassertion follows a fixed 1200ms timeout after VCC exceeds 4.1V *and* MR is released; the push-pull active-high RESET output is referenced to VCC and sinks ≤0.3V at 1.2mA load. The device operates across -40°C to +85°C with no external components required.
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 | 4.100V ±2.5% (suffix "41"); precisely matches 4.2V Li-ion battery full-charge monitoring |
| Reset Timeout | 1200ms min (suffix "D4"); ensures µP completes full boot sequence before release |
| Watchdog Timeout | 3.3s typ (suffix "S"); balances fault detection speed against false triggers in interrupt-driven firmware |
| RESET Output Type | Push-pull active-high; eliminates need for external pullup and supports direct µP reset pin interface |
| VCC Operating Range | 1.2V to 5.5V; valid reset assertion guaranteed down to VCC = 1.1V for deep brownout coverage |
| MR Input | Active-low with 10kΩ internal pullup; accepts CMOS logic levels and requires no external bias |
Pinout & Package
MAX6865UK41D4S+T is housed in a lead-free 5-pin SOT23-5 package (JEDEC MO-178AA), footprint-compatible with industry-standard supervisory ICs. Pin 1 is RESET (active-high push-pull), Pin 2 is GND, Pin 3 is MR (manual reset input), Pin 4 is WDI (watchdog input), and Pin 5 is VCC (supply voltage input).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output; drives µP reset pin directly without pullup resistor |
| 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 (10kΩ); debounced by design |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); resets internal timer on each transition |
| 5 | VCC | Supply voltage input; monitored for reset generation; bypass with 0.1µF capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current extends battery life in glucose monitors and wearables |
| Guaranteed reset validity | RESET remains functional down to VCC = +1.1V, ensuring reliability during deep brownout |
| No external components | Integrated MR pullup, precision voltage reference, and watchdog oscillator eliminate BOM parts |
| Transient immunity | Immune to VCC glitches <40µs at 100mV overdrive, preventing spurious resets in noisy environments |
| Watchdog edge sensitivity | Detects WDI pulses as short as 150ns, enabling tight software loop monitoring without timing overhead |
Applications
| Portable Medical Devices | Wearable Health Monitors |
|---|---|
|
Use Scenario: Continuous glucose monitor operating on coin-cell battery with intermittent sensor sampling. IC Role / Device Role / Timing Role: Supervisory circuit asserting reset during battery voltage sag below 4.1V and detecting firmware lockup via WDI. Use Value: Prevents corrupted sensor readings by forcing µP reboot before data transmission; 170nA ICC adds <0.5% annual battery drain. |
Use Scenario: ECG patch with Bluetooth LE connectivity and real-time arrhythmia detection firmware. IC Role / Device Role / Timing Role: Active-high RESET output directly interfaces with ARM Cortex-M0+ reset pin; WDI monitors main loop execution. Use Value: 3.3s watchdog timeout aligns with maximum allowable firmware stall time before clinical alert loss; 1200ms reset hold guarantees full bootloader initialization. |
| Industrial Handheld Terminals | Low-Power IoT Sensors |
|
Use Scenario: Rugged barcode scanner powered by rechargeable Li-ion, subject to mechanical switch bounce and ESD events. IC Role / Device Role / Timing Role: MR input accepts momentary switch closure; RESET output holds µP in reset until stable 4.1V rail is confirmed. Use Value: Internal 10kΩ MR pullup eliminates external resistor; glitch rejection filters switch bounce without RC network. |
Use Scenario: Soil moisture sensor node sleeping >99% of time, waking hourly to measure and transmit via LoRaWAN. IC Role / Device Role / Timing Role: VCC supervisor ensures clean boot after cold-start from depleted battery; watchdog guards against radio stack hang. Use Value: 4.1V threshold matches nominal 4.2V LiFePO₄ cell; 170nA ICC allows 10-year operation on 1200mAh battery at 1% duty cycle. |
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 timer; 200ms reset timeout; SOT23-5 package | Suitable only for systems requiring 3.3V rail monitoring without software hang protection | Select when watchdog functionality is unnecessary and cost sensitivity outweighs feature set |
| MAX6361KA29D3+T | 2.93V reset threshold; 150ms timeout; no watchdog; push-pull active-low RESET; same SOT23-5 footprint | Designed for lower-voltage logic rails (e.g., 3.0V µPs); lacks WDI for firmware supervision | Choose for legacy designs using active-low reset inputs and simpler supervision requirements |
Compared with TPS3836K33DBVR and MAX6361KA29D3+T, the MAX6865UK41D4S+T uniquely combines 4.1V precision threshold, 1200ms extended reset hold, and integrated 3.3s watchdog - making it the only option for battery-powered medical devices requiring both brownout resilience and software execution integrity.
Availability
MAX6865UK41D4S+T is available at Aetrix Electronics and suitable for portable medical devices, wearable health monitors, industrial handheld terminals, and low-power IoT sensors requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6865UK41D4S+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX68xx family was designed specifically for ultra-low-power microprocessor supervision in battery-critical systems, integrating voltage monitoring, manual reset, and watchdog functionality into minimal 5-pin SOT23 packages.
FAQ
What is the exact reset threshold voltage of the MAX6865UK41D4S+T?
The MAX6865UK41D4S+T has a factory-trimmed reset threshold of 4.100V with ±2.5% tolerance over temperature (-40°C to +85°C), as defined by the "41" suffix in its part number per Maxim's Threshold Suffix Guide. This value is guaranteed by design and tested during production, ensuring precise brownout detection for 4.2V Li-ion battery systems.
Does the MAX6865UK41D4S+T require external components for basic operation?
No, the MAX6865UK41D4S+T operates autonomously with no external components required. It integrates a 10kΩ internal pullup on the MR pin, precision voltage reference, watchdog oscillator, and reset timer. Only a 0.1µF ceramic bypass capacitor on VCC to GND is recommended for noise suppression in noisy environments.
How does the watchdog timer in the MAX6865UK41D4S+T respond to firmware activity?
The MAX6865UK41D4S+T watchdog timer resets on every rising or falling edge at the WDI pin. If WDI remains static (high or low) for longer than 3.3s (typical), the timer expires and asserts RESET for 1200ms. The timer clears instantly on any WDI transition, MR assertion, or RESET assertion - enabling tight integration with firmware loops.
What is the function of Pin 1 (RESET) on the MAX6865UK41D4S+T?
Pin 1 of the MAX6865UK41D4S+T is an active-high push-pull RESET output. It drives high (to VCC) when reset is asserted and low when deasserted. This eliminates the need for an external pullup resistor and allows direct connection to microprocessors with active-high reset inputs, such as many ARM Cortex-M series devices.
Can the MAX6865UK41D4S+T operate reliably at very low supply voltages?
Yes, the MAX6865UK41D4S+T guarantees valid RESET output down to VCC = +1.1V, ensuring robust operation during deep brownout conditions. Below this voltage, its ability to sink current declines, but for most µPs that cease operation above 1.1V, this specification provides full functional coverage across the usable battery discharge range.
MAX6865UK41D4S+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:
- 1.2s Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK41D4S+T FAQ
1.How can I place an order for MAX6865UK41D4S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK41D4S+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 MAX6865UK41D4S+T reliable?
The price and inventory of MAX6865UK41D4S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK41D4S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK41D4S+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK41D4S+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6865UK41D4S+T?
MAX6865UK41D4S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK41D4S+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 MAX6865UK41D4S+T?
For technical support, including MAX6865UK41D4S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK41D4S+T requirements.
6.How does Aetrix verify that MAX6865UK41D4S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK41D4S+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 MAX6865UK41D4S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK41D4S+T?
All MAX6865UK41D4S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK41D4S+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 MAX6865UK41D4S+T part is unused and in its original packaging.
Return procedure for MAX6865UK41D4S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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