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Analog Devices Inc./Maxim Integrated MAX6865UK41D1L+T
- Part No.:
- MAX6865UK41D1L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK41D1L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,261
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Product details
Overview
MAX6865UK41D1L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 4.100V reset threshold (±2.5%), 10ms minimum reset timeout, manual reset input (MR), and watchdog timer with 209s typical timeout (L-suffix). It monitors VCC in battery-powered medical and portable electronics to ensure reliable µP initialization during brownout or software hang.
For engineers reviewing the MAX6865UK41D1L+T datasheet, MAX6865UK41D1L+T pinout, MAX6865UK41D1L+T application, or MAX6865UK41D1L+T equivalent, this page delivers verified specifications, functional pin mapping, real-world use cases, and validated alternative options for low-power system supervision design.
Technical Context
The MAX6865UK41D1L+T integrates voltage monitoring, manual reset assertion, and watchdog timer functionality in a single BiCMOS IC. Its reset output remains asserted for ≥10ms after VCC rises above 4.100V and MR deasserts, and it guarantees valid reset operation down to VCC = +1.1V.
Watchdog timing is triggered by WDI edge transitions; expiration occurs if WDI remains static >209s (typ), clearing only on rising/falling edges, MR assertion, or active reset. The device uses internal 10kΩ MR pullup and supports push-pull active-high RESET output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at VCC = 1.8V - enables multi-year battery life in glucose monitors and pagers. |
| Reset Threshold Voltage | 4.100V ±2.5% - factory-trimmed for precise 3.3V/5V rail supervision without external resistors. |
| Reset Timeout Period | 10ms min (D1 option) - ensures µP reset pulse meets minimum assertion time for ARM Cortex-M boot sequences. |
| Watchdog Timeout | 209s typ (L-suffix) - suitable for low-frequency firmware polling in patient monitors with infrequent I/O activity. |
| VCC Operating Range | 1.2V to 5.5V - supports supervision of Li-ion, alkaline, and regulated 3.3V/1.8V rails. |
| RESET Output Type | Push-pull active-high - eliminates need for external pullup and simplifies interface to µP reset inputs requiring high-active assertion. |
| Guaranteed Reset Validity | To VCC = +1.1V - maintains deterministic reset state during deep brownout, critical for data retention in flash-based µPs. |
Pinout & Package
MAX6865UK41D1L+T is housed in a lead-free 5-pin SOT23-5 package (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 µP reset pin directly; sinks/source up to 1.2mA at VCC ≥ 2.38V. |
| 2 | GND | Ground reference - must be connected to system ground plane with low-impedance path to minimize noise coupling. |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; accepts CMOS logic or momentary switch to GND. |
| 4 | WDI | Watchdog input - detects rising/falling edges; resets internal timer on each transition; immune to <150ns glitches. |
| 5 | VCC | Supply voltage input - monitored rail; requires 0.1µF ceramic bypass capacitor to GND for transient immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current - extends battery life in always-on medical wearables beyond 5 years. |
| Immunity to VCC transients | Rejects ≤40µs transients at 100mV overdrive - prevents false resets in noisy automotive accessory circuits. |
| No external components | Factory-trimmed threshold and timeout - eliminates resistor dividers, timing capacitors, and calibration effort. |
| Watchdog glitch rejection | 150ns minimum WDI pulse width - tolerates digital noise while detecting true firmware stalls. |
| Reset validity at low VCC | Functional down to VCC = +1.1V - ensures safe shutdown sequencing before power collapse in energy-harvesting systems. |
Applications
| Glucose Monitors | Patient Monitors |
|---|---|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission and low-power sleep cycles. IC Role / Device Role / Timing Role: Supervises 3.3V MCU supply and triggers hardware reset if firmware hangs during sensor calibration or radio handshake. Use Value: Prevents missed hypoglycemia alerts by enforcing full µP reboot within 10ms, leveraging 209s watchdog timeout aligned with clinical sampling intervals. |
Use Scenario: Multi-parameter bedside monitor with ECG, SpO₂, and NIBP modules sharing a single ARM-based controller. IC Role / Device Role / Timing Role: Monitors main 5V rail and asserts active-high RESET to initialize controller on power-up or brownout. Use Value: Guarantees deterministic boot state even during AC line sags, using 4.100V threshold matched to 5V regulator dropout margin. |
| Portable Diagnostic Tools | Smart Wearables |
Use Scenario: Handheld ultrasound probe with rechargeable Li-ion battery and intermittent high-current transducer bursts. IC Role / Device Role / Timing Role: Detects VCC droop below 4.100V during burst mode and holds RESET active until stable recovery. Use Value: Avoids corrupted image buffers by enforcing ≥10ms reset pulse synchronized to analog front-end power sequencing. |
Use Scenario: Fitness tracker with motion sensor, heart-rate monitor, and BLE SoC operating on coin-cell battery. IC Role / Device Role / Timing Role: Provides manual reset via button press and watchdog supervision of firmware task scheduler. Use Value: Enables user-initiated recovery from frozen UI while 170nA ICC preserves 12-month battery life between charges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK41D1L+T | Same 4.100V threshold, 10ms timeout, 209s watchdog, but active-low push-pull RESET output. | Requires µP with active-low reset input; incompatible with active-high reset architectures without level-shifting. | Select when interfacing to legacy µPs like MSP430F5xx that mandate active-low reset assertion. |
| TPS3836K33DBVR | 3.3V fixed threshold, 200ms timeout, no watchdog, 1.6µA ICC - higher current, no WDI capability. | Suitable only for basic power-on reset; cannot replace MAX6865UK41D1L+T in systems requiring firmware hang detection. | Choose for cost-sensitive, non-watchdog applications where 3.3V rail supervision suffices and ultra-low ICC is not required. |
Compared with MAX6864UK41D1L+T and TPS3836K33DBVR, the MAX6865UK41D1L+T uniquely combines active-high RESET, nanopower operation, and long-interval watchdog - making it optimal for modern low-power medical SoCs needing both robust brownout response and software fault recovery.
Availability
MAX6865UK41D1L+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered diagnostics, and smart wearables requiring stable component supply across extended product lifecycles.
Supply support for MAX6865UK41D1L+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 power, sensing, and interface applications in industrial, medical, and communications markets.
The MAX6854–MAX6869 family was engineered specifically for ultra-low-power microprocessor supervision in battery-critical systems, integrating voltage monitoring, manual reset, and configurable watchdog functionality in minimal footprint.
FAQ
What is the exact reset threshold voltage of MAX6865UK41D1L+T?
The MAX6865UK41D1L+T has a factory-trimmed reset threshold of 4.100V, with guaranteed tolerance of ±2.5% over -40°C to +85°C. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "41" corresponds to 4.100V nominal. The device asserts reset when VCC falls below this threshold and maintains reset for ≥10ms after VCC exceeds it.
Does MAX6865UK41D1L+T support active-high or active-low reset output?
MAX6865UK41D1L+T provides an active-high push-pull RESET output, as specified in its pin description and Selector Guide. Pin 1 drives high during reset assertion and low during deassertion - directly compatible with µPs requiring high-active reset inputs such as certain STM32 and NXP Kinetis families. This differs from MAX6864 variants which offer active-low outputs.
What is the watchdog timeout behavior of MAX6865UK41D1L+T?
The MAX6865UK41D1L+T features a watchdog timer with 209s typical timeout (L-suffix), with min/max values of 95s and 487s. The timer clears on any WDI edge (rising or falling), MR assertion, or active reset. If WDI remains static beyond timeout, RESET asserts for the configured 10ms period. This behavior is validated in Electrical Characteristics Table and Figure 3 of the datasheet.
Can MAX6865UK41D1L+T operate down to 1.2V supply voltage?
Yes, MAX6865UK41D1L+T operates across VCC = 1.2V to 5.5V, with guaranteed reset functionality down to VCC = +1.1V. At 1.2V, supply current is 190nA (typ), and RESET output remains valid - enabling use in single-cell alkaline or LiFePO₄ systems where rail voltage decays below 2V. This is explicitly stated in the Absolute Maximum Ratings and Electrical Characteristics tables.
Is MAX6865UK41D1L+T pin-compatible with other MAX68xx supervisory ICs?
MAX6865UK41D1L+T shares the same 5-pin SOT23-5 footprint and pinout (VCC, WDI, MR, GND, RESET) with MAX6864/MAX6866/MAX6867–MAX6869, but is not pin-compatible with MAX6854–MAX6863 due to CT pin substitution. Its RESET output polarity (active-high) also differs from MAX6864 (active-low), requiring schematic review before substitution.
MAX6865UK41D1L+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:
- 4.1V
- 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
MAX6865UK41D1L+T FAQ
1.How can I place an order for MAX6865UK41D1L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK41D1L+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 MAX6865UK41D1L+T reliable?
The price and inventory of MAX6865UK41D1L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK41D1L+T is usually 5 days.
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Once your MAX6865UK41D1L+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 MAX6865UK41D1L+T?
For technical support, including MAX6865UK41D1L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK41D1L+T requirements.
6.How does Aetrix verify that MAX6865UK41D1L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK41D1L+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 MAX6865UK41D1L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK41D1L+T?
All MAX6865UK41D1L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK41D1L+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 MAX6865UK41D1L+T part is unused and in its original packaging.
Return procedure for MAX6865UK41D1L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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