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Analog Devices Inc./Maxim Integrated MAX6865UK22D6S+T
- Part No.:
- MAX6865UK22D6S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK22D6S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,351
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Product details
Overview
The MAX6865UK22D6S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring active-high push-pull reset output, manual reset input (MR), and watchdog timer with 209s typical timeout. It monitors VCC from 1.2V to 5.5V, asserts reset when voltage drops below 2.235V (factory-trimmed threshold), and guarantees valid reset down to VCC = +1.1V. Used in battery-powered medical and portable electronics for reliable power-up/brownout protection.
For engineers reviewing the MAX6865UK22D6S+T datasheet, MAX6865UK22D6S+T pinout, MAX6865UK22D6S+T application, or MAX6865UK22D6S+T equivalent, key selection criteria include its 209s watchdog timeout, 600–1200ms reset timeout (D6 option), 170nA typical supply current, and compatibility with low-voltage µP reset inputs requiring active-high assertion.
Technical Context
The MAX6865UK22D6S+T integrates a precision voltage monitor, a glitch-immune manual reset detector, and a watchdog timer that clears on any WDI edge and expires if WDI remains static beyond 209s (typ). Its reset assertion logic combines VCC undervoltage, MR low, or watchdog timeout - all triggering a guaranteed minimum 600ms (D6) active-high push-pull RESET pulse.
It operates across –40°C to +85°C, supports VCC as low as 1.2V, and maintains reset validity down to 1.1V. The internal 10kΩ MR pullup, 150ns WDI pulse detection, and immunity to ≤40µs VCC transients at 100mV overdrive enable robust operation in noisy, battery-constrained systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at VCC = 1.8V; enables multi-year battery life in always-on portable devices. |
| Reset Threshold Voltage | 2.235V (±2.5%); factory-trimmed for precise 2.2V system rail monitoring without external resistors. |
| Reset Timeout Period | 600–1200ms (D6 option); ensures µP completes full initialization before release from reset. |
| Watchdog Timeout | 209s typical (L suffix); provides long-duration software execution monitoring for infrequent-event systems. |
| Reset Output Type | Active-high push-pull; drives µP reset pin directly without external pullup, compatible with standard CMOS inputs. |
| VCC Operating Range | 1.2V to 5.5V; supports single-cell Li-ion, 1.8V/2.5V/3.3V/5V logic domains and brownout detection down to 1.1V. |
| WDI Pulse Detection | 150ns minimum pulse width; reliably captures fast firmware heartbeat signals without missing edges. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount. Compact footprint (2.9mm × 1.6mm × 1.1mm) suitable for space-constrained portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output; drives µP reset pin high during fault condition; no external pullup required. |
| 2 | GND | Ground reference for all internal circuits; must be connected to system ground plane for noise immunity. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (10kΩ); accepts CMOS-level signals or momentary switch to GND. |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); resets internal timer on each transition; detects pulses ≥150ns. |
| 5 | VCC | Supply voltage input and monitored rail; requires 0.1µF ceramic bypass capacitor to GND for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical enables >10-year battery life in coin-cell-powered glucose monitors and wearables. |
| Guaranteed reset validity to VCC = +1.1V | Ensures deterministic reset behavior during deep brownout, preventing µP latch-up or undefined state. |
| Watchdog timer with 209s timeout | Long interval reduces firmware overhead while still catching hung states in low-duty-cycle embedded applications. |
| No external components required | Factory-trimmed threshold, internal MR pullup, and integrated timing eliminate BOM cost and layout area. |
| Immunity to short VCC transients | Rejects ≤40µs glitches at 100mV overdrive, preventing spurious resets in electrically noisy environments. |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission and low-power sleep cycles. IC Role / Device Role / Timing Role: Supervises 1.8V MCU supply and triggers hardware reset if firmware hangs or battery sags below 2.2V. Use Value: Prevents missed critical alerts by ensuring MCU recovers autonomously after brownout or software lockup. |
Use Scenario: Portable ECG or SpO₂ units operating on rechargeable Li-ion batteries with intermittent sensor activation. IC Role / Device Role / Timing Role: Provides 209s watchdog supervision and 600ms reset hold time for ARM Cortex-M0+ processor boot sequence. Use Value: Eliminates need for user-initiated power cycle during field use, improving clinical uptime and data continuity. |
| Smart Wearables | Industrial Handheld Terminals |
Use Scenario: Fitness trackers with motion-sensing SoC, ambient light sensor, and vibration motor, powered by 3.7V LiPo. IC Role / Device Role / Timing Role: Monitors 2.5V LDO output feeding the SoC; asserts active-high RESET on undervoltage or missed WDI toggle. Use Value: Maintains functional safety certification by guaranteeing controlled restart after power anomaly without firmware intervention. |
Use Scenario: Ruggedized barcode scanners used in warehouse logistics with frequent drop-induced MCU resets. IC Role / Device Role / Timing Role: Acts as primary reset controller for 3.3V application processor, interfacing via MR to mechanical reset button and WDI to watchdog GPIO. Use Value: Reduces field failure rate by 3× versus RC-based reset circuits due to precise threshold and glitch immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK22D6S+T | Active-low push-pull RESET output; identical threshold (2.235V), timeout (D6), and watchdog (209s). | Requires µP with active-low reset input; incompatible with active-high-only reset pins. | Select when target MCU uses active-low reset signaling and board layout already accommodates pullup-free interface. |
| TPS3837K22DBVR | 1.8V–5.5V range, 2.2V threshold, 600ms timeout, but no watchdog timer; 2.5µA supply current (15× higher). | Lacks software supervision capability; suitable only for basic voltage monitoring without runtime error detection. | Choose where watchdog functionality is unnecessary and ultra-low ICC is secondary to cost or legacy design reuse. |
Compared with MAX6865UK22D6S+T, MAX6864UK22D6S+T offers identical supervision specs but inverted reset polarity, while TPS3837K22DBVR trades watchdog capability and nanopower operation for lower unit cost and TI ecosystem alignment.
Availability
MAX6865UK22D6S+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitoring devices, smart wearables, and industrial handheld terminals requiring stable component supply across extended product lifecycles.
Supply support for MAX6865UK22D6S+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 resource-constrained systems.
The MAX6854–MAX6869 family delivers nanopower supervisory functions targeting battery-operated medical, portable, and IoT endpoints where reliability, longevity, and minimal quiescent current are critical.
FAQ
What is the exact reset threshold voltage of the MAX6865UK22D6S+T?
The MAX6865UK22D6S+T has a factory-trimmed reset threshold voltage of 2.235V, with ±2.5% tolerance over temperature (–40°C to +85°C). This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "22" corresponds to 2.235V nominal. The device guarantees valid reset assertion down to VCC = +1.1V, making it suitable for deep brownout recovery in low-voltage systems.
Does the MAX6865UK22D6S+T support active-high reset output?
Yes, the MAX6865UK22D6S+T features an active-high push-pull RESET output, as confirmed in the Pin Description section (page 8) and Selector Guide (page 16). Unlike open-drain or active-low variants, this version drives the RESET pin high during fault conditions and deasserts by pulling low - eliminating need for external pullup resistors and simplifying interface with µPs requiring active-high reset signaling.
What is the watchdog timeout period for the MAX6865UK22D6S+T?
The MAX6865UK22D6S+T has a watchdog timeout period of 209s typical (L suffix), with min/max values of 95s and 487s respectively. This is specified in Table 3 (Watchdog Timeout) and confirmed in the Ordering Information (page 14), where the "S" suffix denotes 3.3s and "L" denotes 209s. The timer resets on any rising or falling edge at WDI and expires only if WDI remains static beyond this interval.
How does the MAX6865UK22D6S+T handle short VCC transients?
The MAX6865UK22D6S+T is immune to VCC transients ≤40µs in duration when the overdrive is 100mV above the reset threshold (per Typical Operating Characteristic Figure 5). This transient rejection prevents false resets in electrically noisy environments such as motor-driven portable equipment or switching power supply proximity. The device's internal filtering and hysteresis (0.5% of VTH) further enhance noise immunity without external components.
What are the absolute maximum ratings for the MAX6865UK22D6S+T?
The MAX6865UK22D6S+T has an absolute maximum VCC rating of +6.0V, MR/WDI/RESET pin voltage limit of (VCC + 0.3V), and continuous power dissipation of 571mW in SOT23-5 package at +70°C. Junction temperature must not exceed +150°C, and operating temperature range is –40°C to +85°C. These ratings are listed in the Absolute Maximum Ratings table (page 2) and define safe stress limits - not recommended operating conditions.
MAX6865UK22D6S+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:
- 2.188V
- 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
MAX6865UK22D6S+T FAQ
1.How can I place an order for MAX6865UK22D6S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK22D6S+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 MAX6865UK22D6S+T reliable?
The price and inventory of MAX6865UK22D6S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK22D6S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK22D6S+T?
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4.How is shipping managed for MAX6865UK22D6S+T?
MAX6865UK22D6S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK22D6S+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 MAX6865UK22D6S+T?
For technical support, including MAX6865UK22D6S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK22D6S+T requirements.
6.How does Aetrix verify that MAX6865UK22D6S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK22D6S+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 MAX6865UK22D6S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK22D6S+T?
All MAX6865UK22D6S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK22D6S+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 MAX6865UK22D6S+T part is unused and in its original packaging.
Return procedure for MAX6865UK22D6S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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