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Analog Devices Inc./Maxim Integrated MAX6865UK23D6L+T
- Part No.:
- MAX6865UK23D6L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK23D6L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,439
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Product details
Overview
The MAX6865UK23D6L+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 2.313V (typ), MR is pulled low, or WDI fails to toggle within 209s (typ), and holds reset for ≥600ms after recovery. Designed for ultra-low-power battery-operated medical and portable electronics.
For engineers reviewing the MAX6865UK23D6L+T datasheet, MAX6865UK23D6L+T pinout, MAX6865UK23D6L+T application, or MAX6865UK23D6L+T equivalent, key selection criteria include its 170nA typical supply current, factory-trimmed 2.313V reset threshold, 600–1200ms reset timeout, 209s watchdog period, and guaranteed reset validity down to VCC = +1.1V - critical for brownout resilience in energy-constrained systems.
Technical Context
This device implements a dual-trigger reset architecture: one path monitors VCC against a precision bandgap-based threshold (±2.5% tolerance), while a second path detects MR assertion or WDI inactivity. The internal watchdog timer clears on any WDI edge (rising/falling) and resumes counting only after RESET deasserts.
The reset timeout generator uses an RC-based oscillator calibrated for temperature stability (±1% normalized tRP over –40°C to +85°C), and the push-pull RESET output drives high to VCC with 0.8×VCC VOH at 500µA source current - enabling direct interface with 1.8V/2.5V/3.3V µP reset inputs without external level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at VCC = 1.8V; enables >10-year battery life in coin-cell-powered devices. |
| Reset Threshold | 2.313V (typ), ±2.5% accuracy; matches common 2.5V rail brownout detection with margin. |
| Reset Timeout | 600ms minimum (D6 option); ensures µP completes power-rail stabilization before release. |
| Watchdog Timeout | 209s typical (L suffix); supports long-loop firmware execution while catching hangs. |
| VCC Operating Range | 1.2V to 5.5V; valid reset assertion guaranteed down to VCC = 1.1V for deep brownout coverage. |
| MR Input | Active-low, internally pulled up to VCC via 10kΩ; accepts CMOS logic or momentary switch without external components. |
| WDI Pulse Width | 150ns minimum; tolerates fast MCU GPIO toggling without false watchdog clears. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount. Pin 1 is RESET (active-high push-pull), Pin 2 is GND, Pin 3 is MR (manual reset input), Pin 4 is WDI (watchdog input), Pin 5 is VCC (supply voltage input).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output; drives high to VCC during reset assertion; no external pullup required. |
| 2 | GND | Ground reference for all internal circuits; must be connected to system ground plane. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC; initiates reset when pulled ≤0.3×VCC. |
| 4 | WDI | Watchdog input; rising or falling edge clears internal timer; static high/low >209s triggers reset. |
| 5 | VCC | Supply voltage input (1.2V–5.5V); monitored for brownout; bypass with 0.1µF capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables multi-year operation on CR2032 coin cells. |
| Immunity to VCC transients | Rejects 100mV transients ≤40µs duration - prevents spurious resets in noisy power environments. |
| Guaranteed reset validity | RESET remains functional down to VCC = +1.1V, ensuring reliable brownout response even near cutoff. |
| No external components | Internal 10kΩ MR pullup, factory-trimmed threshold, and self-contained timing eliminate BOM cost and layout area. |
| Watchdog edge sensitivity | Detects 150ns WDI pulses - compatible with high-speed MCU GPIO toggling without signal conditioning. |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
Use Scenario: Portable handheld glucose meters powered by single CR2032 battery with intermittent usage over 2+ years. IC Role / Device Role / Timing Role: Supervisory IC asserting active-high RESET to ARM Cortex-M0 µP during cold-start, brownout, or software hang. Use Value: 170nA ICC extends battery life beyond 36 months; 209s watchdog timeout accommodates long sensor calibration sequences without false resets. |
Use Scenario: Wearable ECG patch requiring continuous low-power operation and fail-safe reboot on firmware crash. IC Role / Device Role / Timing Role: Voltage monitor and watchdog supervisor triggering hard reset of ultra-low-power RISC-V MCU upon VCC dip or WDI stall. Use Value: Guaranteed RESET validity to VCC = 1.1V ensures reset assertion even during deep discharge; 600ms timeout allows ADC reference settling before µP boot. |
| Smart Pagers | Industrial Handheld Terminals |
Use Scenario: Two-way pagers with intermittent RF transmission, relying on LiMnO₂ primary cell for 5-year shelf life. IC Role / Device Role / Timing Role: Nanopower supervisor providing MR-initiated reset for field service and VCC-monitored reset during battery swap. Use Value: 2.313V reset threshold aligns with nominal 2.5V rail; MR input accepts direct connection to tactile switch - zero external parts needed. |
Use Scenario: Ruggedized barcode scanners used in warehouse logistics, subject to ESD and supply noise from motor drivers. IC Role / Device Role / Timing Role: Brownout protector and watchdog enforcer for Cortex-A53 application processor running Linux. Use Value: Immunity to 40µs VCC transients prevents false resets near motors; open-drain-compatible RESET output isolates reset domain from noisy 5V peripherals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK23D6S+T | Same package and pinout; watchdog timeout = 3.3s (S suffix) instead of 209s (L suffix). | Better suited for short-loop firmware where rapid hang detection is required. | Select MAX6864UK23D6S+T when watchdog response time <5s is mandatory and long idle periods are rare. |
| TPS3836K33DBVR | Pin-compatible; fixed 3.08V reset threshold; no watchdog; 200ms reset timeout; 4.5µA ICC. | Lacks WDI functionality; higher supply current limits battery life in always-on devices. | Choose TPS3836K33DBVR only if watchdog is unnecessary and system operates exclusively from stable 3.3V rails. |
Compared with MAX6865UK23D6L+T, the MAX6864UK23D6S+T offers faster watchdog response but sacrifices long-duration hang coverage, while the TPS3836K33DBVR eliminates watchdog capability entirely and draws 26× more current - making MAX6865UK23D6L+T the sole choice for ultra-low-power, watchdog-reliant medical and portable designs.
Availability
MAX6865UK23D6L+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, smart pagers, and industrial handheld terminals requiring stable component supply across extended product lifecycles and strict medical-grade reliability.
Supply support for MAX6865UK23D6L+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 MAX6854–MAX6869 family delivers nanopower supervisory functionality with integrated watchdog timers and manual reset - engineered specifically for battery-critical portable healthcare and consumer electronics where runtime and reliability are non-negotiable.
FAQ
What is the exact reset threshold voltage of the MAX6865UK23D6L+T?
The MAX6865UK23D6L+T has a factory-trimmed reset threshold of 2.313V (typical), with ±2.5% tolerance over temperature (–40°C to +85°C). This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "23" corresponds to VTH = 2.313V. The MAX6865UK23D6L+T maintains this accuracy without external calibration.
Does the MAX6865UK23D6L+T support active-high or active-low reset output?
The MAX6865UK23D6L+T features an active-high push-pull RESET output (Pin 1), as confirmed in the MAX6865 pin description and Selector Guide. When asserted, RESET drives high to VCC; when deasserted, it pulls low. This eliminates need for external pullup resistors and simplifies interfacing with µPs requiring active-high reset signals.
What is the watchdog timeout period for the MAX6865UK23D6L+T?
The MAX6865UK23D6L+T provides a watchdog timeout period of 209s (typical), specified by the "L" suffix in the part number. Minimum and maximum values are 95s and 487s respectively, per Table 3 (Watchdog Timeout). This long timeout supports firmware with extended idle or calibration phases without risking false resets.
Can the MAX6865UK23D6L+T operate reliably below 1.8V supply voltage?
Yes - the MAX6865UK23D6L+T operates from VCC = 1.2V to 5.5V and guarantees valid RESET assertion down to VCC = +1.1V, as stated in the Electrical Characteristics table. Its 170nA typical supply current at 1.8V and stable reset behavior at 1.2V make it suitable for Li-ion/LiFePO₄ battery systems nearing end-of-discharge.
Is the MAX6865UK23D6L+T pin-compatible with other devices in the MAX68xx family?
Yes - the MAX6865UK23D6L+T uses the standard 5-pin SOT23-5 package and shares identical pinout with MAX6864/MAX6866/MAX6867/MAX6869 variants (Pin 1: RESET, Pin 2: GND, Pin 3: MR, Pin 4: WDI, Pin 5: VCC). This allows drop-in substitution within the same watchdog-enabled subgroup, provided reset polarity and timeout requirements match.
MAX6865UK23D6L+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:
- 2.313V
- 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
MAX6865UK23D6L+T FAQ
1.How can I place an order for MAX6865UK23D6L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK23D6L+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 MAX6865UK23D6L+T reliable?
The price and inventory of MAX6865UK23D6L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK23D6L+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK23D6L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK23D6L+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6865UK23D6L+T?
MAX6865UK23D6L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK23D6L+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 MAX6865UK23D6L+T?
For technical support, including MAX6865UK23D6L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK23D6L+T requirements.
6.How does Aetrix verify that MAX6865UK23D6L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK23D6L+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 MAX6865UK23D6L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK23D6L+T?
All MAX6865UK23D6L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK23D6L+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 MAX6865UK23D6L+T part is unused and in its original packaging.
Return procedure for MAX6865UK23D6L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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