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Analog Devices Inc./Maxim Integrated MAX6865UK45D5L+T
- Part No.:
- MAX6865UK45D5L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK45D5L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,392
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Product details
Overview
The MAX6865UK45D5L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, combining voltage monitoring, manual reset input (MR), and watchdog timer (WDI) with active-high push-pull RESET output. It asserts reset when VCC drops below 4.500V (typ), MR is pulled low, or WDI fails to toggle within 209s (typ). Designed for ultra-low-power systems, it draws only 170nA (typ) supply current and guarantees valid reset down to VCC = +1.1V.
For engineers reviewing the MAX6865UK45D5L+T datasheet, MAX6865UK45D5L+T pinout, MAX6865UK45D5L+T application, or MAX6865UK45D5L+T equivalent, this device serves as a critical power-on reset and software fault recovery element in battery-constrained embedded systems where supply current, brownout immunity, and watchdog timeout stability are design-critical parameters.
Technical Context
The MAX6865UK45D5L+T implements a precision bandgap-based voltage monitor with ±2.5% reset threshold accuracy over -40°C to +85°C, paired with a temperature-stable RC-based watchdog timer offering 209s typical timeout (L-suffix). Its internal 10kΩ MR pullup enables direct switch interfacing without external components.
This variant features push-pull active-high RESET output referenced to VCC, factory-trimmed 4.500V reset threshold (suffix "45"), 450ms minimum reset timeout (D5), and L-suffix 209s watchdog timeout - all integrated into a single 5-pin SOT23-5 package with no external timing components required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.500V (typ), ±2.5% tolerance - ensures reliable brownout detection at nominal 4.5V rail without false triggers |
| Supply Current | 170nA (typ) at +25°C - enables multi-year operation on coin-cell batteries in portable medical devices |
| Reset Timeout | 450ms (min) - provides sufficient hold time for slow-starting µPs and peripheral initialization sequences |
| Watchdog Timeout | 209s (typ), L-suffix - supports long-loop firmware execution while detecting catastrophic hangs |
| Operating Voltage | 1.2V to 5.5V - allows use across 1.8V, 3.3V, and 5V logic domains with guaranteed reset validity down to 1.1V |
| Output Type | Push-pull active-high RESET - eliminates need for external pullup and simplifies interface to µP reset inputs requiring high-active assertion |
| MR Input | Active-low with 10kΩ internal pullup - enables momentary switch reset without external biasing components |
Pinout & Package
MAX6865UK45D5L+T is housed in a lead-free 5-pin SOT23-5 package (JEDEC MO-178AA), with 1.3mm height and 2.9mm × 1.6mm footprint. Pin 1 is marked with a dot; pin numbering follows standard SOT23 orientation (counterclockwise from mark).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives high during reset condition; compatible with µP reset inputs expecting high-active assertion |
| 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; driven low to initiate reset independent of VCC level |
| 4 | WDI | Watchdog input - rising or falling edge clears internal timer; sustained high/low >209s triggers reset |
| 5 | VCC | Supply voltage input - monitored for reset generation; bypass with 0.1µF ceramic capacitor to GND for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical - extends battery life in glucose monitors and wearables beyond 5 years on CR2032 |
| Guaranteed reset validity | Down to VCC = +1.1V - ensures deterministic reset behavior during deep brownout conditions |
| Immunity to short VCC transients | No reset for ≤40µs transients at 100mV overdrive - prevents spurious resets in noisy automotive or industrial environments |
| No external components required | Integrated MR pullup, timing elements, and voltage reference - reduces BOM count and PCB area by ≥3 passives |
| Watchdog transition detection | 150ns minimum pulse width support - accommodates fast µP I/O toggling without missing watchdog refreshes |
Applications
| Portable Medical Devices | Battery-Powered IoT Sensors |
|---|---|
Use Scenario: Continuous glucose monitoring (CGM) patch worn for 14 days on single coin cell. IC Role / Device Role / Timing Role: Supervises 3.3V rail and detects µP lockup via WDI; asserts active-high RESET to reboot firmware after missed watchdog refresh. Use Value: 170nA quiescent current directly enables 14-day runtime; 209s watchdog timeout matches sensor sampling interval without premature resets. |
Use Scenario: LoRaWAN soil moisture node deployed in remote fields with solar charging. IC Role / Device Role / Timing Role: Monitors 3.6V Li-ion battery voltage and provides manual reset via BLE command; holds RESET high for 450ms during cold boot. Use Value: 4.500V reset threshold prevents false resets during solar charge fluctuations; D5 timeout ensures full RF initialization before µP release. |
| Industrial Handheld Terminals | Low-Power Wearables |
Use Scenario: Rugged barcode scanner operating in warehouses with frequent power cycling. IC Role / Device Role / Timing Role: Detects VCC brownout during hot-swap battery replacement and initiates controlled µP reset via MR input. Use Value: MR's 10kΩ internal pullup eliminates external resistor; 1.1V reset validity ensures reset assertion even during battery sag to 1.2V. |
Use Scenario: Fitness tracker with optical heart-rate sensor requiring periodic firmware updates. IC Role / Device Role / Timing Role: Provides fail-safe reset during OTA update corruption; WDI tied to update state machine to detect stalled writes. Use Value: Push-pull active-high RESET simplifies connection to ARM Cortex-M reset pin; no external pullup needed saves space in 8mm × 8mm module. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK45D5S+T | Same package and reset threshold, but S-suffix watchdog timeout (3.3s typ) instead of L-suffix (209s) | Suitable for applications requiring rapid watchdog response (e.g., motor control firmware), not long-interval monitoring | Select when shorter watchdog timeout aligns with firmware loop timing; not drop-in for 209s requirement |
| TPS3837K33DBVR | 3.3V fixed reset threshold, 200ms reset timeout, no watchdog timer, SOT23-5 package | Lacks WDI functionality; requires external circuitry for software fault detection | Use only if watchdog capability is unnecessary and 3.3V threshold suffices; not functionally equivalent |
Compared with MAX6864UK45D5S+T and TPS3837K33DBVR, the MAX6865UK45D5L+T uniquely delivers 4.5V threshold, 450ms reset hold, and 209s watchdog in one nanopower package - making it irreplaceable for long-cycle battery-powered medical and telemetry systems requiring both precise brownout detection and extended hang detection.
Availability
MAX6865UK45D5L+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered IoT sensors, and industrial handheld terminals requiring stable component supply with guaranteed long-term availability and lead-free compliance.
Supply support for MAX6865UK45D5L+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 management, sensing, and interface applications in demanding industrial, medical, and communications systems.
The MAX6865UK45D5L+T belongs to the MAX68xx nanopower supervisory family, engineered specifically for ultra-low-power embedded systems where extended battery life, robust brownout protection, and software fault recovery are essential.
FAQ
What is the exact reset threshold voltage of the MAX6865UK45D5L+T?
The MAX6865UK45D5L+T has a factory-trimmed reset threshold of +4.500V (typical), 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 "45" corresponds to 4.500V. The device guarantees valid reset assertion down to VCC = +1.1V, ensuring reliability during deep brownout conditions.
Does the MAX6865UK45D5L+T require external components for basic operation?
No, the MAX6865UK45D5L+T operates autonomously with no external components required. It integrates an internal 10kΩ pullup on the MR pin, precision voltage reference, RC timing for reset and watchdog functions, and push-pull driver circuitry. Only a 0.1µF ceramic bypass capacitor on VCC is recommended for noise immunity - no resistors, capacitors, or diodes are needed for core supervision functionality.
What is the watchdog timeout behavior of the MAX6865UK45D5L+T?
The MAX6865UK45D5L+T features an L-suffix watchdog timer with 209s typical timeout (95s min, 487s max). The timer resets on any rising or falling edge at WDI and expires only if WDI remains static (high or low) beyond that period. Upon expiration, it asserts the active-high RESET output for the full 450ms (D5) reset timeout - providing deterministic recovery from firmware hangs in long-interval applications like environmental sensors.
How does the MAX6865UK45D5L+T handle VCC supply transients?
The MAX6865UK45D5L+T is designed to ignore short VCC transients: it will not assert reset for glitches ≤40µs duration when overdriven by 100mV above threshold, as shown in the "Maximum VCC Transient Duration vs. Reset Threshold Overdrive" graph. This immunity prevents spurious resets in electrically noisy environments such as industrial handhelds or automotive accessory modules where supply ripple is common.
Is the MAX6865UK45D5L+T pin-compatible with other MAX68xx variants?
The MAX6865UK45D5L+T shares the same 5-pin SOT23-5 footprint and pinout (RESET, GND, MR, WDI, VCC) with MAX6864–MAX6866 and MAX6867–MAX6869 families. However, pin compatibility does not imply functional equivalence - for example, MAX6865 offers active-high push-pull RESET, while MAX6866 provides open-drain active-low. Direct substitution requires verification of reset polarity, timeout, and watchdog suffix alignment.
MAX6865UK45D5L+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:
- 300ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK45D5L+T FAQ
1.How can I place an order for MAX6865UK45D5L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK45D5L+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 MAX6865UK45D5L+T reliable?
The price and inventory of MAX6865UK45D5L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK45D5L+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK45D5L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK45D5L+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6865UK45D5L+T?
MAX6865UK45D5L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK45D5L+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 MAX6865UK45D5L+T?
For technical support, including MAX6865UK45D5L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK45D5L+T requirements.
6.How does Aetrix verify that MAX6865UK45D5L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK45D5L+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 MAX6865UK45D5L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK45D5L+T?
All MAX6865UK45D5L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK45D5L+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 MAX6865UK45D5L+T part is unused and in its original packaging.
Return procedure for MAX6865UK45D5L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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