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Analog Devices Inc./Maxim Integrated MAX6865UK20D2S+T
- Part No.:
- MAX6865UK20D2S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK20D2S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,806
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Product details
Overview
The MAX6865UK20D2S+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 functionality. It asserts an active-high push-pull RESET output when VCC drops below 2.000V (±2.5%), MR is asserted, or the watchdog expires after 3.3s (typ). Designed for ultra-low-power systems, it draws only 170nA (typ) at 2.5V and guarantees valid reset operation down to VCC = +1.1V.
For engineers reviewing the MAX6865UK20D2S+T datasheet, MAX6865UK20D2S+T pinout, MAX6865UK20D2S+T application, or MAX6865UK20D2S+T equivalent, this device serves as a critical power-on reset and software fault monitor in battery-constrained embedded systems where supply current, brownout immunity, and watchdog timeout precision are design-critical.
Technical Context
The MAX6865UK20D2S+T implements a factory-trimmed 2.000V reset threshold with ±2.5% tolerance over –40°C to +85°C and integrates a watchdog timer with 3.3s typical timeout (S-suffix), triggered by absence of edges on WDI. Its internal 10kΩ MR pullup and glitch rejection (200ns) enable robust manual reset without external components.
This variant features an active-high push-pull RESET output referenced to VCC, a fixed 40ms minimum reset timeout (D2 option), and operates across VCC = 1.2V–5.5V. It guarantees RESET validity down to VCC = 1.1V and exhibits immunity to VCC transients ≤40µs at 100mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.000V ±2.5% - ensures reliable brownout detection for 2.0V nominal rails |
| Supply Current | 170nA (typ) at 2.5V - enables multi-year battery life in portable medical devices |
| Watchdog Timeout | 3.3s (typ), S-suffix - provides sufficient margin for firmware recovery loops |
| Reset Timeout | 40ms (min), D2 option - meets µP power-up initialization timing requirements |
| VCC Range | 1.2V to 5.5V - supports single-cell Li-ion, coin-cell, and 3.3V/5V logic domains |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup and simplifies interface to µP reset inputs |
| Operating Temp | –40°C to +85°C - qualified for industrial and portable consumer environments |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount. Pin 1 is RESET (active-high push-pull), Pin 2 is GND, Pin 3 is MR (active-low manual reset), Pin 4 is WDI (watchdog input), Pin 5 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output; drives high during reset assertion; referenced to VCC |
| 2 | GND | Ground reference for all internal circuitry and reset timing |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; 200ns glitch rejection |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); clears timer on transition; 150ns pulse width min |
| 5 | VCC | Supply voltage input and monitored rail; requires 0.1µF bypass capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in glucose monitors |
| Guaranteed RESET down to VCC = 1.1V | Ensures deterministic reset behavior during deep brownout, before µP loses functional state |
| Watchdog with 3.3s timeout | Prevents firmware lockup in safety-critical portable devices without requiring clock source |
| No external components required | Integrates MR pullup, reset timer, and watchdog - reduces BOM count and PCB area |
| Immunity to short VCC transients | Rejects ≤40µs glitches at 100mV overdrive - avoids spurious resets in noisy power environments |
Applications
| Portable Glucose Monitors | Patient Monitoring Devices |
|---|---|
|
Use Scenario: Continuous blood glucose measurement using low-power sensor ICs and Bluetooth LE transmission. IC Role / Device Role / Timing Role: Supervises 1.8V sensor rail and 3.3V radio rail; asserts RESET on brownout and triggers watchdog if firmware hangs during ADC sampling. Use Value: Prevents corrupted glucose readings due to undervoltage-induced µP malfunction; extends CR2032 battery life beyond 2 years. |
Use Scenario: Wearable ECG patch with real-time arrhythmia detection and emergency alert transmission. IC Role / Device Role / Timing Role: Monitors main 2.0V system rail; initiates hard reset if BLE stack fails to respond to watchdog pulses within 3.3s. Use Value: Guarantees fail-safe reboot without user intervention, meeting IEC 60601-1 essential performance requirements. |
| Industrial Handheld Scanners | Smart Energy Meters |
|
Use Scenario: Rugged barcode scanner powered by rechargeable Li-ion with intermittent solar charging. IC Role / Device Role / Timing Role: Detects VCC sag during motor-driven scan actuation; uses MR for hardware-initiated calibration reset. Use Value: Eliminates firmware crashes during high-current pulses; enables field-serviceable recalibration via momentary switch. |
Use Scenario: Tamper-resistant electricity meter with metrology SoC and secure bootloader. IC Role / Device Role / Timing Role: Guards 2.0V metrology core supply; watchdog prevents malicious code execution during secure boot verification. Use Value: Meets ANSI C12.10 and IEC 62055-31 security requirements for reset integrity and runtime supervision. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK20D2S+T | Identical specs except active-low push-pull RESET output | Requires µP with active-low reset input; no level-shifting needed | Select when interfacing to legacy µPs expecting active-low reset assertion |
| TPS3836K20DBVR | 2.0V threshold, 200ms reset timeout, no watchdog, 3.5µA ICC | Lacks watchdog functionality; higher supply current limits battery life | Choose only if watchdog is unnecessary and longer reset hold time is acceptable |
Compared with MAX6865UK20D2S+T, MAX6864UK20D2S+T offers identical supervision but inverted reset polarity, while TPS3836K20DBVR trades watchdog capability and nanopower operation for lower cost and wider availability-making it suitable only for non-safety-critical, mains-powered designs.
Availability
MAX6865UK20D2S+T is available at Aetrix Electronics and suitable for portable medical devices, patient monitors, industrial handheld scanners, and smart energy meters requiring stable component supply across extended product lifecycles.
Supply support for MAX6865UK20D2S+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 delivers nanopower supervisory functions targeting battery-operated equipment where ultra-low ICC, guaranteed reset validity at low VCC, and integrated watchdog timing are essential for reliability.
FAQ
What is the exact reset threshold voltage of the MAX6865UK20D2S+T?
The MAX6865UK20D2S+T has a factory-trimmed reset threshold of 2.000V 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 "20" corresponds to 2.000V nominal. The device guarantees valid reset assertion down to VCC = +1.1V, making it suitable for deep-brownout scenarios in the MAX6865UK20D2S+T application space.
Does the MAX6865UK20D2S+T include a watchdog timer, and what is its timeout?
Yes, the MAX6865UK20D2S+T includes a watchdog timer with a typical timeout of 3.3s, indicated by the "S" suffix in the part number. The timer expires if no rising or falling edge occurs on the WDI pin within that period. It is cleared automatically on RESET assertion, MR activation, or any WDI edge-ensuring robust firmware supervision in the MAX6865UK20D2S+T implementation.
What type of RESET output does the MAX6865UK20D2S+T provide?
The MAX6865UK20D2S+T provides an active-high push-pull RESET output (Pin 1), meaning it drives high during reset assertion and returns low when deasserted. This eliminates the need for an external pullup resistor and simplifies interface to microprocessors with active-high reset inputs-confirmed in the MAX6865UK20D2S+T pin description and Selector Guide.
What is the minimum reset timeout period for the MAX6865UK20D2S+T?
The MAX6865UK20D2S+T has a fixed minimum reset timeout period of 40ms, denoted by the "D2" suffix. This value is specified in Table 4 (Reset Timeout Periods) as 40ms (min), 60ms (typ), and 80ms (max). The timeout begins after VCC rises above the 2.000V threshold and MR is deasserted, ensuring sufficient hold time for µP initialization in the MAX6865UK20D2S+T system.
Is the MAX6865UK20D2S+T compatible with 1.8V systems?
Yes, the MAX6865UK20D2S+T operates across VCC = 1.2V to 5.5V and guarantees valid RESET output down to VCC = +1.1V. Its 2.000V reset threshold is well-suited for monitoring 1.8V rails with adequate noise margin, and its 170nA supply current minimizes loading-making it ideal for 1.8V battery-powered applications such as those using the MAX6865UK20D2S+T in portable diagnostics.
MAX6865UK20D2S+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:
- 2V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 40ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK20D2S+T FAQ
1.How can I place an order for MAX6865UK20D2S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK20D2S+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 MAX6865UK20D2S+T reliable?
The price and inventory of MAX6865UK20D2S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK20D2S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK20D2S+T?
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4.How is shipping managed for MAX6865UK20D2S+T?
MAX6865UK20D2S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK20D2S+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 MAX6865UK20D2S+T?
For technical support, including MAX6865UK20D2S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK20D2S+T requirements.
6.How does Aetrix verify that MAX6865UK20D2S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK20D2S+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 MAX6865UK20D2S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK20D2S+T?
All MAX6865UK20D2S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK20D2S+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 MAX6865UK20D2S+T part is unused and in its original packaging.
Return procedure for MAX6865UK20D2S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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