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Analog Devices Inc./Maxim Integrated MAX6865UK24D6L+T
- Part No.:
- MAX6865UK24D6L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK24D6L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,746
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Product details
Overview
The MAX6865UK24D6L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, combining voltage monitoring (2.4V reset threshold), manual reset input, and watchdog timer with 209s typical timeout. It asserts an active-high push-pull RESET output when VCC drops below threshold, MR is asserted, or watchdog expires - ensuring reliable boot-up and fault recovery in ultra-low-power systems.
For engineers reviewing the MAX6865UK24D6L+T datasheet, MAX6865UK24D6L+T pinout, MAX6865UK24D6L+T application, or MAX6865UK24D6L+T equivalent, this device is selected for battery-powered medical monitors, portable instrumentation, and embedded controllers requiring guaranteed reset validity down to VCC = +1.1V, <170nA supply current, and immunity to short VCC transients.
Technical Context
This device implements a precision bandgap-based voltage monitor with ±2.5% threshold accuracy over temperature, coupled with a digitally timed watchdog circuit that clears on any WDI edge and times out after 209s (typ) if inactive. The internal reset timeout is fixed at 1200ms (D6 option), and the active-high push-pull RESET output is referenced to VCC with VOH ≥ 0.8×VCC at ISOURCE = 500µA.
It features a 10kΩ internal MR pullup, 150ns minimum WDI pulse width detection, and guaranteed operation from -40°C to +85°C. The watchdog timeout exhibits <±20% variation over temperature, and the device remains functional with VCC as low as 1.2V - critical for brownout resilience in single-cell Li-ion or coin-cell systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.400V (factory-trimmed, ±2.5% over temp) - ensures precise power-rail supervision for 2.5V logic domains |
| Supply Current | 170nA (typ) at VCC = 1.8V - enables multi-year battery life in always-on wearable sensors |
| Reset Timeout | 1200ms (min) - provides sufficient hold time for slow-starting µPs and peripheral initialization |
| Watchdog Timeout | 209s (typ), L-suffix - supports long-cycle firmware tasks without spurious resets |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup and simplifies interface to µP reset inputs |
| VCC Operating Range | 1.2V to 5.5V - compatible with single-cell Li-ion (2.7–4.2V), NiMH, and 3.3V/5V systems |
| Reset Validity Limit | Guaranteed to VCC = +1.1V - ensures deterministic reset assertion during deep brownout |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount. Compact footprint (2.9mm × 1.6mm × 1.1mm) suitable for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives µP reset pin directly; sinks/source up to 500µA |
| 2 | GND | Ground reference - must be connected to system ground plane for noise immunity and accurate threshold sensing |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC (10kΩ); accepts CMOS logic levels |
| 4 | WDI | Watchdog input - edge-sensitive (rising/falling); clears internal timer on each transition; min pulse width 150ns |
| 5 | VCC | Supply and monitored rail - powers device and serves as voltage sense input; requires 0.1µF bypass capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current - extends battery life in glucose monitors and remote sensors |
| Watchdog immunity | Clears on any WDI edge - prevents false timeouts during periodic polling or interrupt-driven code flow |
| VCC transient rejection | Immune to ≤40µs transients at 100mV overdrive - avoids nuisance resets in noisy DC-DC environments |
| No external components | Self-contained supervision - eliminates discrete R/C networks and reduces BOM count and layout area |
| Reset validity at low VCC | Functional down to VCC = +1.1V - ensures reset assertion integrity during deep discharge or cold-temperature operation |
Applications
| Portable Glucose Monitors | Patient Vital Sign Loggers |
|---|---|
Use Scenario: Continuous subcutaneous glucose sensing with Bluetooth LE transmission and low-power sleep cycles. IC Role / Device Role / Timing Role: Supervises 3.3V rail and triggers full-system reset if firmware hangs or power sags during sensor calibration. Use Value: Prevents undetected sensor drift or missed alarms by enforcing deterministic recovery within 1200ms of watchdog timeout. |
Use Scenario: Wearable ECG patch recording heart rate, SpO₂, and respiration over 72-hour deployments. IC Role / Device Role / Timing Role: Monitors coin-cell-supplied 2.4V domain and asserts reset if VCC drops below 2.4V during cold ambient conditions. Use Value: Guarantees valid reset signal even at VCC = 1.1V, enabling safe shutdown before data corruption occurs. |
| Handheld Diagnostic Tools | Industrial Wireless Sensors |
Use Scenario: Battery-powered ultrasound probe with ARM Cortex-M4 and analog front-end ASIC. IC Role / Device Role / Timing Role: Provides manual reset via tactile button and watchdog supervision of firmware execution loops. Use Value: 209s watchdog timeout accommodates long acquisition sequences without requiring frequent WDI toggling. |
Use Scenario: LoRaWAN node measuring temperature/humidity in remote infrastructure with 10-year battery target. IC Role / Device Role / Timing Role: Supervises buck-regulated 2.4V rail and initiates clean restart after brownout caused by load switching transients. Use Value: 170nA quiescent current contributes <0.15µA average to total system sleep current, preserving battery longevity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK24D6L+T | Same 2.4V threshold, 1200ms timeout, 209s watchdog, but active-low push-pull RESET output | Requires µP with active-low reset input; incompatible with active-high-only reset pins | Select when interfacing to legacy µPs expecting active-low reset assertion |
| TPS3838K25DBVR | 2.5V threshold, 200ms timeout, no watchdog, 1.6µA ICC - higher current, shorter timeout, no WDI function | Suitable only for basic power-on reset; cannot replace watchdog functionality in safety-critical firmware monitoring | Choose only for cost-sensitive, non-watchdog applications where 2.5V threshold suffices and 1.6µA ICC is acceptable |
Compared with MAX6864UK24D6L+T and TPS3838K25DBVR, the MAX6865UK24D6L+T uniquely delivers active-high reset signaling *plus* 209s watchdog supervision at nanopower levels - making it the sole fit for new designs requiring both features in space- and energy-constrained medical devices.
Availability
MAX6865UK24D6L+T is available at Aetrix Electronics and suitable for portable medical diagnostics, battery-powered instrumentation, and industrial wireless sensor nodes requiring stable component supply across extended product lifecycles.
Supply support for MAX6865UK24D6L+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 connectivity applications in industrial, medical, and communications markets.
The MAX68xx family targets ultra-low-power microprocessor supervision - specifically engineered for battery-operated medical, portable, and IoT endpoints needing guaranteed reset behavior, watchdog safety, and minimal ICC.
FAQ
What is the exact reset threshold voltage of the MAX6865UK24D6L+T?
The MAX6865UK24D6L+T has a factory-trimmed reset threshold of 2.400V, with guaranteed tolerance of ±2.5% over the full operating temperature range (-40°C to +85°C). This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "24" corresponds to 2.400V nominal. The device asserts reset when VCC falls below this threshold and holds reset for 1200ms after VCC rises above it.
Does the MAX6865UK24D6L+T support active-high or active-low reset output?
The MAX6865UK24D6L+T provides an active-high push-pull RESET output, as confirmed by its pin description (Pin 1 = RESET, active-high) and Selector Guide entry. Unlike the MAX6864 variant, it does not assert low on fault - instead, it drives high during reset assertion. This matches µPs with active-high reset inputs and eliminates external pullup requirements.
What is the watchdog timeout period for the MAX6865UK24D6L+T?
The MAX6865UK24D6L+T uses the "L" watchdog suffix, specifying a typical timeout period of 209s, with min/max bounds of 95s and 487s respectively. This long timeout is designed for firmware with extended idle or measurement cycles, and the timer clears on every rising or falling edge at the WDI pin - preventing false timeouts during normal operation.
Can the MAX6865UK24D6L+T operate reliably at very low supply voltages?
Yes - the MAX6865UK24D6L+T guarantees valid reset assertion down to VCC = +1.1V, as explicitly stated in the Electrical Characteristics table and Applications Information section. Its supply voltage range is 1.2V to 5.5V, and internal circuitry remains functional and deterministic even during deep brownout conditions common in single-cell battery systems.
Is the MAX6865UK24D6L+T pin-compatible with other devices in the MAX68xx family?
The MAX6865UK24D6L+T uses the standard 5-pin SOT23-5 package and shares identical pinout with MAX6864/MAX6866 variants (Pin 1=RESET, Pin 2=GND, Pin 3=MR, Pin 4=WDI, Pin 5=VCC). However, it is *not* pin-compatible with MAX6861–MAX6863 (which use CT instead of WDI) or MAX6854–MAX6856 (which lack WDI). Always verify function mapping before substitution.
MAX6865UK24D6L+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:
- 2.4V
- 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
MAX6865UK24D6L+T FAQ
1.How can I place an order for MAX6865UK24D6L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK24D6L+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 MAX6865UK24D6L+T reliable?
The price and inventory of MAX6865UK24D6L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK24D6L+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK24D6L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK24D6L+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6865UK24D6L+T?
MAX6865UK24D6L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK24D6L+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 MAX6865UK24D6L+T?
For technical support, including MAX6865UK24D6L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK24D6L+T requirements.
6.How does Aetrix verify that MAX6865UK24D6L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK24D6L+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 MAX6865UK24D6L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK24D6L+T?
All MAX6865UK24D6L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK24D6L+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 MAX6865UK24D6L+T part is unused and in its original packaging.
Return procedure for MAX6865UK24D6L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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