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Analog Devices Inc./Maxim Integrated MAX6865UK33D1S+T
- Part No.:
- MAX6865UK33D1S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK33D1S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,086
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Product details
Overview
The MAX6865UK33D1S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, a factory-trimmed 3.3V reset threshold (±2.5%), and a 10ms minimum reset timeout period. It integrates manual reset input (MR), watchdog timer with 3.3s typical timeout, and push-pull active-high RESET output - designed for reliable power-on reset and brownout protection in battery-critical systems like glucose monitors and portable medical devices.
For engineers reviewing the MAX6865UK33D1S+T datasheet, MAX6865UK33D1S+T pinout, MAX6865UK33D1S+T application, or MAX6865UK33D1S+T equivalent, key selection criteria include its guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), watchdog edge-triggered clearing logic, and lead-free SOT23-5 packaging compliant with RoHS requirements.
Technical Context
The MAX6865UK33D1S+T implements a dual-monitoring architecture: a precision voltage detector with hysteresis (0.5% of VTH) triggers reset on VCC drop below 3.3V, while a dedicated watchdog timer monitors WDI activity - expiring only if no rising/falling edge occurs within 3.3s (typ). Reset assertion persists for ≥10ms after VCC recovery and MR deassertion, ensuring µP initialization completes before release.
Its internal 10kΩ MR pullup enables direct connection to momentary switches without external components; the push-pull active-high RESET output drives directly into CMOS inputs with VOH ≥ 0.8×VCC (at ISOURCE = 500µA) and VOL ≤ 0.3V (at ISINK = 1.2mA), eliminating need for pullup resistors or level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at VCC = 1.8V - enables multi-year operation on coin-cell batteries in always-on medical sensors. |
| Reset Threshold | 3.3V ±2.5% - factory-trimmed for precise monitoring of 3.3V system rails without external calibration. |
| Reset Timeout | 10ms min (D1 option) - ensures sufficient hold time for slow-starting µPs and peripheral initialization sequences. |
| Watchdog Timeout | 3.3s typ (S suffix) - balances fault detection responsiveness with software execution margin in embedded firmware loops. |
| VCC Operating Range | 1.2V to 5.5V - supports wide-input battery-powered systems including single-cell Li-ion (2.7–4.2V) and alkaline stacks. |
| Reset Validity Limit | VCC ≥ 1.1V - guarantees deterministic RESET state during deep brownout, preventing undefined µP behavior. |
| MR Glitch Rejection | 200ns - suppresses EMI-induced noise on manual reset lines without external RC filtering. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, RoHS-compliant, 1.6mm × 2.9mm footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-high) | Push-pull output asserted high during reset; sinks ≤0.3V at 1.2mA, sources ≥0.8×VCC at 500µA - directly interfaces µP reset pins without external components. |
| 2 | GND | Power ground reference for all internal comparators and logic; must be low-impedance connection to system ground plane. |
| 3 | MR (active-low) | Manual reset input with internal 10kΩ pullup to VCC; accepts CMOS-level signals or open-drain drivers; 1µs minimum pulse width. |
| 4 | WDI | Watchdog input cleared by any rising or falling edge; detects pulses ≥150ns; resets internal timer on transition - enables robust firmware supervision. |
| 5 | VCC | Main supply input monitored for brownout; requires 0.1µF ceramic bypass capacitor to GND for noise immunity per datasheet recommendation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current extends battery life in portable medical devices beyond 5 years on CR2032 cells. |
| Guaranteed reset at low VCC | Valid RESET assertion down to VCC = +1.1V prevents spurious µP wake-up during critical power collapse phases. |
| Watchdog edge-triggered clear | WDI transitions (not level holds) reset timer - eliminates false timeouts caused by static firmware states or I/O leakage. |
| No external components required | Integrated MR pullup, precision voltage reference, and reset timing eliminate discrete R/C networks and trimming parts. |
| Transient immunity | Immune to VCC glitches ≤40µs duration at 100mV overdrive - maintains system stability in electrically noisy environments. |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Monitors |
|---|---|
|
Use Scenario: Continuous glucose sensing with Bluetooth LE transmission powered by coin-cell battery. IC Role / Device Role / Timing Role: Supervises 3.3V rail from boost converter; asserts RESET during battery sag; triggers watchdog if BLE stack hangs. Use Value: Prevents corrupted sensor readings or failed transmissions by enforcing controlled µP reboot before data loss occurs. |
Use Scenario: Portable ECG/SpO₂ monitor operating 24/7 on rechargeable Li-ion. IC Role / Device Role / Timing Role: Monitors main 3.3V domain; initiates hard reset on brownout; validates firmware liveness via WDI toggling. Use Value: Ensures clinical-grade reliability - no silent failures during critical patient observation windows. |
| Industrial Handheld Scanners | Smart Wearable Health Trackers |
|
Use Scenario: Rugged barcode scanner used in warehouse logistics with frequent battery swaps. IC Role / Device Role / Timing Role: Provides power-on reset and detects MCU lockup during RF-intensive scanning bursts. Use Value: Eliminates field returns due to frozen UI by guaranteeing automatic recovery without user intervention. |
Use Scenario: Fitness band with optical heart-rate sensor and motion co-processor. IC Role / Device Role / Timing Role: Supervises 3.3V sensor subsystem; uses 10ms reset timeout to match fast-boot sensor firmware. Use Value: Enables sub-second wake-from-sleep responsiveness while maintaining >14-day battery runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK33D1S+T | Same 3.3V threshold, 10ms timeout, and 3.3s watchdog - but features active-low push-pull RESET output instead of active-high. | Requires inverted reset logic on µP side; unsuitable for systems where RESET pin expects active-high assertion. | Select MAX6864UK33D1S+T only when target µP reset input is active-low and board layout cannot accommodate signal inversion. |
| TPS3837K33DBVR | 3.3V threshold, 200ms min reset timeout, no watchdog; 1.6µA supply current - 10× higher than MAX6865UK33D1S+T. | Lacks watchdog functionality; longer timeout may delay recovery in time-critical medical alarms. | Choose TPS3837K33DBVR only for cost-sensitive, non-watchdog applications where 1.6µA ICC is acceptable and 200ms reset hold is functionally adequate. |
Compared with MAX6864UK33D1S+T, the MAX6865UK33D1S+T provides native active-high reset compatibility, reducing BOM count and PCB routing complexity; versus TPS3837K33DBVR, it delivers 10× lower quiescent current and integrated watchdog - essential for battery longevity and firmware reliability in Class II medical devices.
Availability
MAX6865UK33D1S+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign recorders, industrial handheld scanners, and smart wearable health trackers requiring stable component supply across long production lifecycles.
Supply support for MAX6865UK33D1S+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 demanding applications in industrial, medical, and communications markets.
The MAX6865UK33D1S+T belongs to the MAX68xx nanopower supervisory family, engineered specifically for ultra-low-power, safety-critical embedded systems where extended battery life and deterministic reset behavior are mandatory.
FAQ
What is the exact reset threshold voltage tolerance for MAX6865UK33D1S+T?
The MAX6865UK33D1S+T has a factory-trimmed reset threshold of 3.3V with a guaranteed tolerance of ±2.5% over the full -40°C to +85°C temperature range. This corresponds to a minimum threshold of 3.218V and a maximum of 3.383V, ensuring consistent brownout detection across environmental conditions without external calibration.
Does MAX6865UK33D1S+T require an external pullup resistor on the RESET pin?
No, MAX6865UK33D1S+T does not require an external pullup resistor on the RESET pin because it features a push-pull active-high output stage. The device actively drives RESET high during assertion and low during deassertion, providing VOH ≥ 0.8×VCC and VOL ≤ 0.3V under specified load conditions - eliminating need for external biasing components.
How does the watchdog timer in MAX6865UK33D1S+T respond to firmware stalls?
The MAX6865UK33D1S+T watchdog timer expires if no rising or falling edge occurs on the WDI pin for longer than 3.3s (typical). Upon expiration, it asserts the active-high RESET output for ≥10ms. The timer clears immediately on any WDI transition - making it highly effective against infinite loops or hung interrupt service routines that fail to toggle WDI.
Can MAX6865UK33D1S+T operate reliably at VCC = 1.2V?
Yes, MAX6865UK33D1S+T is fully specified to operate at VCC = 1.2V, with guaranteed reset assertion and valid RESET output behavior down to VCC = +1.1V. At 1.2V, supply current remains ultra-low (≤370nA typ), and MR input thresholds scale proportionally (VIL = 0.3×VCC, VIH = 0.7×VCC), enabling robust operation in deeply discharged battery scenarios.
What is the MR input's internal pullup resistance value for MAX6865UK33D1S+T?
The MR input of MAX6865UK33D1S+T includes an internal pullup resistor of 10kΩ to VCC, as confirmed in the Pin Description section of the datasheet. This allows direct connection of a momentary switch between MR and GND without external components, and supports clean CMOS-level interfacing with microcontrollers or logic gates.
MAX6865UK33D1S+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:
- 3.3V
- 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
MAX6865UK33D1S+T FAQ
1.How can I place an order for MAX6865UK33D1S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK33D1S+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 MAX6865UK33D1S+T reliable?
The price and inventory of MAX6865UK33D1S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK33D1S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK33D1S+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK33D1S+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6865UK33D1S+T?
MAX6865UK33D1S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK33D1S+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 MAX6865UK33D1S+T?
For technical support, including MAX6865UK33D1S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK33D1S+T requirements.
6.How does Aetrix verify that MAX6865UK33D1S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK33D1S+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 MAX6865UK33D1S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK33D1S+T?
All MAX6865UK33D1S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK33D1S+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 MAX6865UK33D1S+T part is unused and in its original packaging.
Return procedure for MAX6865UK33D1S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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