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Analog Devices Inc./Maxim Integrated MAX6865UK45D2L+T
- Part No.:
- MAX6865UK45D2L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK45D2L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,752
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Product details
Overview
The MAX6865UK45D2L+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 4.500V reset threshold (±2.5%), and dual watchdog timeout options (3.3s or 209s typ). It integrates voltage monitoring, manual reset input (MR), and watchdog timer (WDI) to ensure reliable system startup and fault recovery in battery-powered medical and portable electronics.
For engineers reviewing the MAX6865UK45D2L+T datasheet, MAX6865UK45D2L+T pinout, MAX6865UK45D2L+T application, or MAX6865UK45D2L+T equivalent, key selection criteria include its active-high push-pull RESET output, guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), and compatibility with noisy low-power systems requiring deterministic reset timing and watchdog supervision.
Technical Context
This device belongs to the MAX6864–MAX6869 family, which adds watchdog timer functionality to the core supervisory architecture. The MAX6865UK45D2L+T implements an edge-triggered watchdog that clears on any rising or falling transition at WDI and expires if WDI remains static beyond the selected timeout (L = 209s typ).
Its push-pull active-high RESET output is referenced to VCC and delivers VOH ≥ 0.8×VCC (ISOURCE = 500µA) and VOL ≤ 0.3V (ISINK = 1.2mA), ensuring robust logic-level compatibility across 1.2V–5.5V supply ranges. MR is internally pulled up to VCC via 10kΩ and accepts CMOS-compatible input levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at VCC = 1.8V - enables multi-year operation on coin-cell batteries without compromising supervision integrity. |
| Reset Threshold Voltage | 4.500V ±2.5% - precisely matches 4.5V system rails; factory-trimmed for no external calibration. |
| Reset Timeout Period | 40ms min (D2 option) - ensures µP completes power-up sequencing before release from reset. |
| Watchdog Timeout | 209s typ (L suffix) - supports long-duration firmware tasks while detecting catastrophic hangs. |
| Operating Voltage Range | 1.2V to 5.5V - accommodates single-cell Li-ion, 3.3V, and 5V logic domains without level-shifting. |
| Reset Validity Limit | VCC ≥ 1.1V - guarantees RESET assertion remains valid during deep brownout conditions. |
| MR Input Pulse Width | 1µs min - allows clean reset initiation even with fast-switching GPIO or debounced mechanical inputs. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount. Compact footprint (2.9mm × 1.6mm × 1.1mm) optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives high upon fault detection (VCC drop, MR assert, or WDI timeout); no external pullup required. |
| 2 | GND | Ground reference - must be connected to system ground plane for stable reset threshold and noise immunity. |
| 3 | MR | Active-low manual reset input - initiates reset when pulled low; internally pulled up to VCC (10kΩ), compatible with open-drain drivers. |
| 4 | WDI | Watchdog input - must toggle within 209s to prevent timeout; detects edges ≥150ns; resets internal timer on each transition. |
| 5 | VCC | Supply and monitored voltage input - powers the IC and serves as the primary reset monitor 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 and wearable sensors. |
| Factory-trimmed VTH | 4.500V ±2.5% eliminates need for external resistor dividers or calibration in production test. |
| Watchdog immunity to noise | 150ns minimum WDI pulse width rejection prevents false timeouts from EMI or signal glitches. |
| VCC transient immunity | Immune to <40µs VCC dips of 100mV - avoids spurious resets in electrically noisy environments like motor-driven handhelds. |
| Guaranteed reset at low VCC | RESET remains valid down to VCC = +1.1V - ensures fail-safe behavior during critical brownout recovery. |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission and low-power MCU sleep cycles. IC Role / Device Role / Timing Role: Supervises 3.3V MCU power rail and triggers hardware reset if firmware hangs during sensor readout or radio transmit. Use Value: Prevents undetected sensor data loss by enforcing watchdog timeout (209s) aligned with clinical measurement intervals. |
Use Scenario: Portable ECG recorder with rechargeable Li-ion battery and real-time waveform processing. IC Role / Device Role / Timing Role: Monitors 4.5V analog front-end supply and asserts active-high RESET to initialize ADC and DSP on power-up or brownout. Use Value: 4.500V threshold matches regulated 4.5V rail; 40ms reset timeout ensures stable reference settling before sampling begins. |
| Smart Wearables | Industrial Handheld Terminals |
|
Use Scenario: Fitness tracker with motion sensor fusion, heart-rate algorithm, and intermittent BLE advertising. IC Role / Device Role / Timing Role: Provides manual reset via button (MR) and watchdog supervision (WDI) of main application processor. Use Value: 170nA ICC extends battery runtime; MR internal 10kΩ pullup eliminates BOM cost and PCB area for external resistor. |
Use Scenario: Ruggedized barcode scanner operating in warehouse environments with voltage fluctuations and ESD events. IC Role / Device Role / Timing Role: Detects VCC droop below 4.5V due to motor load switching and asserts RESET to prevent corrupted scan buffer writes. Use Value: Immunity to 40µs transients prevents nuisance resets during barcode motor activation, improving operational uptime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK45D2L+T | Active-low push-pull RESET output instead of active-high; identical VTH, timeout, and watchdog specs. | Requires inverted reset logic on host µP; suitable where existing design uses active-low reset input. | Select MAX6864UK45D2L+T only if host MCU reset pin is active-low and board layout cannot accommodate logic inversion. |
| TPS3838K33DBVR | No watchdog timer; fixed 3.08V reset threshold; 200ms reset timeout; 3.5µA ICC - 20× higher quiescent current. | Limited to basic voltage monitoring; unsuitable for firmware hang detection or ultra-low-power multi-year deployments. | Choose TPS3838K33DBVR only for cost-sensitive, non-watchdog applications where 3.3V rail supervision suffices and µA-level ICC is acceptable. |
Compared with MAX6864UK45D2L+T, the MAX6865UK45D2L+T provides native active-high reset signaling, eliminating external inverters; versus TPS3838K33DBVR, it delivers 20× lower ICC and integrated watchdog - essential for certified medical and long-life portable devices.
Availability
MAX6865UK45D2L+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, smart wearables, and industrial handheld terminals requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6865UK45D2L+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 MAX6864–MAX6869 product line targets ultra-low-power supervisory needs in battery-operated medical and portable equipment, emphasizing nanopower operation, factory-trimmed accuracy, and robust watchdog supervision.
FAQ
What is the reset threshold voltage of the MAX6865UK45D2L+T?
The MAX6865UK45D2L+T has a factory-trimmed reset threshold voltage of 4.500V with ±2.5% tolerance over temperature (−40°C to +85°C). This value is fixed per the "45" suffix in the part number and does not require external resistors or calibration. The threshold is guaranteed valid down to VCC = +1.1V, ensuring reliable brownout detection even during deep supply sag.
Does the MAX6865UK45D2L+T include a watchdog timer, and what are its timeout options?
Yes, the MAX6865UK45D2L+T includes a watchdog timer with two factory-selected timeout options: "S" (3.3s typ) or "L" (209s typ). The "L" suffix in MAX6865UK45D2L+T specifies the 209s typical timeout. The timer resets on any rising or falling edge at the WDI pin and expires only if WDI remains static beyond the timeout period - enabling detection of firmware lockups in long-running embedded tasks.
What type of reset output does the MAX6865UK45D2L+T provide?
The MAX6865UK45D2L+T provides an active-high push-pull RESET output (pin 1), meaning it drives high during reset assertion and low when deasserted. This eliminates the need for an external pullup resistor and ensures strong drive capability: VOH ≥ 0.8×VCC (at ISOURCE = 500µA) and VOL ≤ 0.3V (at ISINK = 1.2mA), supporting direct interfacing with 1.2V–5.5V µP reset inputs.
How is the reset timeout period configured on the MAX6865UK45D2L+T?
The reset timeout period on the MAX6865UK45D2L+T is fixed at 40ms minimum (D2 option), as indicated by the "D2" segment in the part number. This value is factory-programmed and non-adjustable. The 40ms duration ensures sufficient time for power supply stabilization and µP internal initialization before release from reset, and is validated across the full −40°C to +85°C operating range.
What is the supply current consumption of the MAX6865UK45D2L+T under normal operation?
The MAX6865UK45D2L+T consumes only 170nA typical supply current (ICC) at VCC = 1.8V and TA = +25°C, rising to 400nA maximum across temperature and voltage extremes. This nanopower performance enables multi-year operation on standard CR2032 coin cells in applications like glucose monitors and wearable health sensors, without compromising supervision reliability or timing accuracy.
MAX6865UK45D2L+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:
- 4.5V
- 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
MAX6865UK45D2L+T FAQ
1.How can I place an order for MAX6865UK45D2L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK45D2L+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 MAX6865UK45D2L+T reliable?
The price and inventory of MAX6865UK45D2L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK45D2L+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK45D2L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK45D2L+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6865UK45D2L+T?
MAX6865UK45D2L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK45D2L+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 MAX6865UK45D2L+T?
For technical support, including MAX6865UK45D2L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK45D2L+T requirements.
6.How does Aetrix verify that MAX6865UK45D2L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK45D2L+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 MAX6865UK45D2L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK45D2L+T?
All MAX6865UK45D2L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK45D2L+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 MAX6865UK45D2L+T part is unused and in its original packaging.
Return procedure for MAX6865UK45D2L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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