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Analog Devices Inc./Maxim Integrated MAX6865UK38D5L+T
- Part No.:
- MAX6865UK38D5L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK38D5L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,451
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Product details
Overview
MAX6865UK38D5L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 3.800V reset threshold (±2.5%), 300ms minimum reset timeout, manual reset input (MR), and watchdog timer with 209s typical timeout. It monitors VCC in battery-powered portable electronics to ensure reliable µP initialization during power-up, brownout, or software hang conditions.
For engineers reviewing the MAX6865UK38D5L+T datasheet, MAX6865UK38D5L+T pinout, MAX6865UK38D5L+T application, or MAX6865UK38D5L+T equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior, and validated alternative options for low-power embedded system design.
Technical Context
The MAX6865UK38D5L+T integrates voltage monitoring, manual reset assertion, and watchdog timer functionality in a single BiCMOS IC. Its reset output asserts when VCC falls below 3.800V, MR is pulled low, or WDI remains static beyond 209s - with guaranteed reset validity down to VCC = +1.1V and immunity to ≤40µs VCC transients at 100mV overdrive.
It features push-pull active-high RESET output referenced to VCC, internal 10kΩ MR pullup, and WDI input that clears the watchdog on any edge transition. The device operates across -40°C to +85°C and draws only 170nA (typ) at 2.5V, enabling multi-year operation from coin-cell batteries.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at 2.5V - enables >10-year battery life in coin-cell–powered devices |
| Reset Threshold | 3.800V ±2.5% - factory-trimmed for precise 3.3V rail supervision without external components |
| Reset Timeout | 300ms minimum (D5 option) - ensures µP completes full boot sequence before release |
| Watchdog Timeout | 209s typical (L suffix) - supports long idle periods in low-duty-cycle sensor nodes |
| VCC Operating Range | 1.2V to 5.5V - compatible with Li-ion, alkaline, and regulated 3.3V/1.8V systems |
| Reset Output Type | Push-pull active-high - eliminates need for external pullup and simplifies interface to µP reset pin |
| Guaranteed Reset Validity | Down to VCC = +1.1V - maintains deterministic reset state during deep brownout |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount. Compact 2.9mm × 1.6mm footprint with 0.95mm height, optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives high during fault condition; no external pullup required |
| 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 via 10kΩ; accepts CMOS logic or momentary switch to GND |
| 4 | WDI | Watchdog input - edge-sensitive; clears internal timer on rising/falling transitions; rejects pulses <150ns |
| 5 | VCC | Supply and monitored voltage input - requires 0.1µF ceramic bypass capacitor to GND for transient suppression |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year operation from CR2032 coin cell in always-on applications |
| Factory-trimmed VTH | 3.800V ±2.5% threshold eliminates calibration overhead and supports direct 3.3V rail supervision |
| Watchdog immunity | WDI detects edges ≥150ns - prevents false timeouts from digital noise while catching true software hangs |
| Brownout resilience | Reset asserted valid down to VCC = +1.1V - guarantees safe µP halt even during severe undervoltage |
| No external components | Integrated MR pullup, precision bandgap, and timeout generator eliminate discrete resistors/capacitors |
Applications
| Portable Medical Sensors | Wearable Health Monitors |
|---|---|
Use Scenario: Glucose meter operating from single AAA battery with intermittent BLE transmission. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output; asserts reset if battery sags below 3.8V or firmware locks during ADC sampling. Use Value: Prevents corrupted glucose readings by forcing clean µP reboot before data transmission. |
Use Scenario: ECG patch with 7-day battery life, waking every 30 seconds for signal acquisition. IC Role / Device Role / Timing Role: Provides 300ms reset hold time after power-up and 209s watchdog timeout between wake cycles. Use Value: Ensures firmware resumes correct state after sleep mode, eliminating silent crashes during long deployments. |
| Industrial Handheld Terminals | Smart Asset Trackers |
Use Scenario: Rugged barcode scanner powered by rechargeable Li-ion, exposed to voltage dips during motor actuation. IC Role / Device Role / Timing Role: Monitors main 3.3V rail; triggers reset on 40µs+ transients exceeding 100mV overdrive. Use Value: Maintains system reliability without requiring oversized input capacitance or complex filtering. |
Use Scenario: GPS tracker reporting location every 6 hours using ultra-low-power µP and cellular modem. IC Role / Device Role / Timing Role: Uses MR for field-service reset and watchdog to recover from modem lockups during network handshakes. Use Value: Eliminates need for physical button access or remote firmware update to restore connectivity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3838K33DBVR | 3.08V fixed threshold, 200ms timeout, no watchdog, SOT23-5 | Lacks watchdog timer and MR input; suitable only for basic power-monitoring use cases | Select when watchdog functionality is unnecessary and cost sensitivity outweighs feature completeness |
| STM6315SDW13F | 3.08V threshold, 1.125s timeout, 1.5µA ICC, no watchdog, SOT23-5 | Higher supply current (1.5µA vs. 170nA) limits battery life; no WDI support | Choose for legacy ST ecosystem compatibility where ultra-low ICC is not critical |
Compared with TPS3838K33DBVR and STM6315SDW13F, the MAX6865UK38D5L+T uniquely combines 170nA ICC, 3.800V precision threshold, 300ms reset hold, and 209s watchdog in one SOT23-5 package - making it optimal for long-life, self-recovering portable systems requiring both voltage and software supervision.
Availability
MAX6865UK38D5L+T is available at Aetrix Electronics and suitable for portable medical sensors, wearable health monitors, industrial handheld terminals, and smart asset trackers requiring stable component supply across extended production lifecycles.
Supply support for MAX6865UK38D5L+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 consumer markets.
The MAX6865UK38D5L+T belongs to the MAX68xx nanopower supervisory family, engineered specifically for ultra-low-power battery-operated systems requiring simultaneous voltage monitoring, manual reset, and watchdog-based software recovery.
FAQ
What is the exact reset threshold voltage of the MAX6865UK38D5L+T?
The MAX6865UK38D5L+T has a factory-trimmed reset threshold of 3.800V 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 "38" corresponds to 3.800V nominal. The device guarantees reset assertion when VCC falls below this threshold and deassertion only after VCC exceeds it plus hysteresis.
Does the MAX6865UK38D5L+T include a watchdog timer, and what is its timeout?
Yes, the MAX6865UK38D5L+T includes a watchdog timer with 209s typical timeout (L suffix). As specified in Table 3 (Watchdog Timeout), the "L" in the part number denotes the long watchdog period (min 95s, typ 209s, max 487s). The timer resets on any edge at WDI and triggers reset if no transition occurs within this window.
What is the function of Pin 1 on the MAX6865UK38D5L+T?
Pin 1 of the MAX6865UK38D5L+T is the RESET output, configured as an active-high push-pull driver. Per the MAX6864/MAX6865/MAX6866 Pin Description section, this pin transitions high when VCC drops below 3.800V, MR is pulled low, or the watchdog expires - and remains high for the full 300ms reset timeout period before returning low.
Can the MAX6865UK38D5L+T operate from a 1.8V supply?
Yes, the MAX6865UK38D5L+T operates from 1.2V to 5.5V per Electrical Characteristics. At 1.8V, its supply current is 170nA (typ), reset threshold remains 3.800V (ensuring supervision of higher rails), and RESET output VOH is guaranteed ≥0.8×VCC with 200µA source current - supporting direct interface to 1.8V logic.
How does the manual reset (MR) input behave on the MAX6865UK38D5L+T?
The MR input on the MAX6865UK38D5L+T is active-low with internal 10kΩ pullup to VCC. Driving MR low initiates reset immediately; the RESET output stays asserted for the full 300ms timeout after MR returns high. MR accepts CMOS logic levels and rejects glitches <200ns, enabling robust switch-based or microcontroller-driven reset control without external debouncing.
MAX6865UK38D5L+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:
- 3.8V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 300ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK38D5L+T FAQ
1.How can I place an order for MAX6865UK38D5L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK38D5L+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 MAX6865UK38D5L+T reliable?
The price and inventory of MAX6865UK38D5L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK38D5L+T is usually 5 days.
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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 MAX6865UK38D5L+T?
For technical support, including MAX6865UK38D5L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK38D5L+T requirements.
6.How does Aetrix verify that MAX6865UK38D5L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK38D5L+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 MAX6865UK38D5L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK38D5L+T?
All MAX6865UK38D5L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK38D5L+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 MAX6865UK38D5L+T part is unused and in its original packaging.
Return procedure for MAX6865UK38D5L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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