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Analog Devices Inc./Maxim Integrated MAX6864UK20D1S+T
- Part No.:
- MAX6864UK20D1S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6864UK20D1S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,004
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Product details
Overview
MAX6864UK20D1S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 2.0V reset threshold (±2.5%), 10ms minimum reset timeout, and 3.3s typical watchdog timeout. It monitors VCC, responds to manual reset (MR), and triggers reset on watchdog timeout - designed for battery-critical applications like glucose monitors and portable medical devices.
For engineers reviewing the MAX6864UK20D1S+T datasheet, MAX6864UK20D1S+T pinout, MAX6864UK20D1S+T application, or MAX6864UK20D1S+T equivalent, key selection criteria include guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), push-pull active-low RESET output, and compatibility with 1.2V–5.5V supply range.
Technical Context
The MAX6864UK20D1S+T integrates three core functions: precision voltage monitoring with hysteresis (0.5% of VTH), a manual reset input with 1µs minimum pulse width and 250ns MR-to-reset delay, and a watchdog timer that clears on any WDI edge and expires if WDI remains static >3.3s (typ). Its BiCMOS process enables stable operation across –40°C to +85°C.
Reset assertion occurs when VCC falls below 2.0V, MR is pulled low, or WDI stalls - and reset remains asserted for ≥10ms after VCC rises above 2.0V *and* MR deasserts *and* WDI activity resumes. The push-pull RESET output sinks up to 1.2mA at VCC ≥ 2.38V (VOL ≤ 0.3V) and sources 500µA with VOH ≥ 0.8×VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at VCC = 1.8V; enables multi-year battery life in always-on medical sensors. |
| Reset Threshold | 2.0V ±2.5%; factory-trimmed for precise brownout detection without external resistors. |
| Reset Timeout | 10ms min (D1 option); ensures µP completes power-rail stabilization before release. |
| Watchdog Timeout | 3.3s typ (S suffix); balances fault coverage and software execution margin in embedded firmware. |
| VCC Range | 1.2V to 5.5V; supports single-cell Li-ion, coin-cell, and multi-rail systems without level-shifting. |
| Reset Validity | Guaranteed to VCC = +1.1V; maintains deterministic reset state during deep brownout. |
| WDI Pulse Width | 150ns min; tolerates fast MCU GPIO toggling without false watchdog clears. |
Pinout & Package
MAX6864UK20D1S+T uses a lead-free 5-pin SOT23-5 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained portable PCBs. Pin 1 is RESET (active-low push-pull), Pin 2 is GND, Pin 3 is MR (active-low manual reset), Pin 4 is WDI (watchdog input), and Pin 5 is VCC (supply monitor input).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset output | Drives µP reset pin directly; no external pullup required; sinks 1.2mA at VCC ≥ 2.38V. |
| 2 - GND | Ground reference | Single ground connection; must tie to system analog/digital ground plane for noise immunity. |
| 3 - MR | Active-low manual reset input | Internally pulled up to VCC via 10kΩ; accepts CMOS logic; 1µs pulse sufficient to trigger reset. |
| 4 - WDI | Watchdog input | Edge-sensitive; clears internal timer on rising/falling transition; immune to <150ns glitches. |
| 5 - VCC | Supply voltage monitor input | Monitors same rail as µP core; bypass with 0.1µF ceramic capacitor to GND for transient rejection. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current extends battery life in coin-cell-powered wearables beyond 5 years. |
| No external components | Factory-trimmed threshold and fixed timing eliminate resistors, capacitors, and calibration effort. |
| VCC transient immunity | Rejects <40µs supply glitches at 100mV overdrive - critical for noisy switch-mode power supply environments. |
| Guaranteed reset at low VCC | Valid RESET assertion down to VCC = +1.1V prevents undefined µP behavior during deep brownout. |
| WDI edge-triggered clear | Resets watchdog on *any* WDI transition - simplifies firmware integration and avoids stuck-loop failure modes. |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Loggers |
|---|---|
|
Use Scenario: Continuous glucose monitoring (CGM) patch worn for 10+ days on single CR2032 cell. IC Role / Device Role / Timing Role: Supervises MCU power-up, detects battery voltage sag below 2.0V, and forces reset if firmware hangs during sensor calibration. Use Value: Prevents erroneous glucose readings by ensuring deterministic MCU restart on brownout or code lockup - meeting ISO 15197 accuracy requirements. |
Use Scenario: Portable ECG/SpO₂ logger recording overnight vitals with Bluetooth LE wake-on-event. IC Role / Device Role / Timing Role: Monitors 1.8V MCU rail; asserts reset if VCC drops during RF transmission surge or if firmware fails to toggle WDI every 3.3s. Use Value: Eliminates silent data corruption by guaranteeing full MCU reboot before next measurement cycle - critical for clinical-grade traceability. |
| Wireless Sensor Nodes | Industrial Handheld Scanners |
|
Use Scenario: LoRaWAN soil moisture node deployed in remote fields, powered by AA alkaline cells. IC Role / Device Role / Timing Role: Provides 10ms reset hold time after cold start and watchdog supervision of sleep/wake firmware state machine. Use Value: Ensures reliable boot sequence despite variable battery impedance and temperature-induced voltage droop - reducing field failure rate by >99%. |
Use Scenario: Rugged barcode scanner used in warehouse logistics with frequent drop-induced MCU resets. IC Role / Device Role / Timing Role: Detects VCC dip during mechanical shock-induced power interruption and initiates controlled reset via MR line tied to power-good signal. Use Value: Avoids partial register corruption by holding reset until rails stabilize - preserving scan history and preventing firmware crash loops. |
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; 200ms reset timeout; 1.6µA ICC. | Lacks WDI supervision - suitable only for simple power-monitoring, not firmware safety-critical systems. | Select when watchdog is unnecessary and higher supply current is acceptable for cost-sensitive designs. |
| STM6315SW13F | 2.63V reset threshold; 1.6s watchdog; 1.5µA ICC; open-drain RESET; requires external pullup. | Higher ICC and open-drain output increase BOM count and reduce noise margin vs. MAX6864UK20D1S+T's push-pull drive. | Choose if 2.63V threshold matches system rail better and board space allows pullup resistor. |
Compared with TPS3836K33DBVR and STM6315SW13F, MAX6864UK20D1S+T delivers 10× lower supply current, integrated watchdog with edge-triggered clear, and push-pull RESET eliminating external components - making it optimal for ultra-low-power, safety-aware portable medical and industrial edge nodes.
Availability
MAX6864UK20D1S+T is available at Aetrix Electronics and suitable for glucose monitors, patient loggers, wireless sensor nodes, and industrial handheld scanners requiring stable component supply with long-term lifecycle assurance.
Supply support for MAX6864UK20D1S+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 high-performance analog and mixed-signal ICs for power, sensing, and interface applications in industrial, medical, and communications markets.
The MAX6864UK20D1S+T belongs to Maxim's nanopower µP supervisory family, engineered specifically for battery-operated medical and portable electronics where sub-µA quiescent current, guaranteed low-VCC reset, and integrated watchdog supervision are mandatory.
FAQ
What is the exact reset threshold voltage of MAX6864UK20D1S+T?
The MAX6864UK20D1S+T has a factory-trimmed reset threshold of 2.0V 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 2.0V nominal. The device guarantees reset assertion when VCC falls below this threshold and holds reset for ≥10ms after VCC exceeds it.
Does MAX6864UK20D1S+T require external components for basic operation?
No, MAX6864UK20D1S+T operates autonomously with no external resistors or capacitors required for core functionality. Only a 0.1µF ceramic bypass capacitor on VCC to GND is recommended for noise immunity. The 2.0V threshold, 10ms reset timeout, and 3.3s watchdog period are all factory-configured - eliminating calibration and reducing BOM count.
How does the watchdog timer in MAX6864UK20D1S+T respond to firmware errors?
The MAX6864UK20D1S+T watchdog timer expires if the WDI input remains static (high or low) for >3.3s (typ). It clears on *any* edge - rising or falling - enabling robust firmware supervision. If the MCU hangs in a loop without toggling WDI, MAX6864UK20D1S+T asserts RESET for ≥10ms, forcing a full hardware reset to recover deterministic operation.
What is the minimum VCC level at which MAX6864UK20D1S+T guarantees valid reset output?
MAX6864UK20D1S+T guarantees valid RESET output down to VCC = +1.1V, as specified in the Electrical Characteristics table. Below this voltage, VOL and VOH specifications degrade, but the device continues asserting RESET until VCC falls further. This ensures µP reset integrity during deep brownout conditions common in battery-powered medical devices.
Is MAX6864UK20D1S+T pin-compatible with other supervisory ICs?
MAX6864UK20D1S+T uses a standard 5-pin SOT23-5 footprint and shares identical pinout (RESET, GND, MR, WDI, VCC) with the MAX6865/MAX6866 variants. It is not pin-compatible with TPS3836-series or STM63xx devices due to differing pin functions (e.g., missing WDI, different RESET polarity or drive type), requiring PCB layout changes for substitution.
MAX6864UK20D1S+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:
- Active
- 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:
- 10ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6864UK20D1S+T FAQ
1.How can I place an order for MAX6864UK20D1S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6864UK20D1S+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 MAX6864UK20D1S+T reliable?
The price and inventory of MAX6864UK20D1S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6864UK20D1S+T is usually 5 days.
3.What payment methods are accepted for MAX6864UK20D1S+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6864UK20D1S+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6864UK20D1S+T?
MAX6864UK20D1S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6864UK20D1S+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 MAX6864UK20D1S+T?
For technical support, including MAX6864UK20D1S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6864UK20D1S+T requirements.
6.How does Aetrix verify that MAX6864UK20D1S+T is sourced from the original manufacturer or authorized distributors?
All MAX6864UK20D1S+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 MAX6864UK20D1S+T meets industry standards.
7.What is the process for return or replacement of MAX6864UK20D1S+T?
All MAX6864UK20D1S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6864UK20D1S+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 MAX6864UK20D1S+T part is unused and in its original packaging.
Return procedure for MAX6864UK20D1S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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