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Analog Devices Inc./Maxim Integrated MAX6865UK39D6S+T
- Part No.:
- MAX6865UK39D6S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK39D6S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,612
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Product details
Overview
MAX6865UK39D6S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 3.9V reset threshold (±2.5%), 1200ms minimum reset timeout, manual reset input (MR), and watchdog timer with 209s typical timeout. It monitors VCC in battery-powered medical and portable electronics to ensure reliable µP initialization during brownout or software hang.
For engineers reviewing the MAX6865UK39D6S+T datasheet, MAX6865UK39D6S+T pinout, MAX6865UK39D6S+T application, or MAX6865UK39D6S+T equivalent, key selection criteria include guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), active-high push-pull RESET output, and compatibility with noisy low-power systems requiring no external components.
Technical Context
The MAX6865UK39D6S+T integrates voltage monitoring, manual reset assertion, and watchdog timer functionality in a single BiCMOS IC. Its reset logic asserts active-high RESET when VCC falls below 3.9V, MR is pulled low, or WDI remains static beyond 209s (typ), with reset deassertion delayed by 600–1200ms after recovery.
It uses internal 10kΩ MR pullup and supports CMOS-level WDI edge detection (min pulse width 150ns). The device operates across -40°C to +85°C with supply voltage range 1.2V–5.5V and guarantees valid RESET output down to VCC = +1.1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at +25°C - enables multi-year operation on coin-cell batteries without compromising supervision reliability. |
| Reset Threshold Voltage | 3.900V ±2.5% - factory-trimmed for precise brownout detection at nominal 3.3V/3.6V system rails. |
| Reset Timeout Period | 600–1200ms min - ensures µP completes power-up sequencing before release from reset state. |
| Watchdog Timeout | 209s typ (L-suffix) - provides long-duration software execution monitoring suitable for infrequent-event embedded applications. |
| VCC Operating Range | 1.2V to 5.5V - supports wide-input voltage systems including Li-ion, alkaline, and regulated 3.3V/2.5V supplies. |
| Reset Output Type | Active-high push-pull - eliminates need for external pullup resistor and simplifies interface to µP reset inputs requiring high-true assertion. |
| Guaranteed Reset Validity | Down to VCC = +1.1V - maintains deterministic reset behavior during deep brownout conditions where many supervisors fail. |
Pinout & Package
MAX6865UK39D6S+T is housed in a RoHS-compliant, 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 1.2mA at VCC ≥ 2.38V, sources 500µA at VOH ≥ 0.8×VCC. |
| 2 | GND | Ground reference - must be connected to system ground plane; shared return path for all internal circuits. |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; accepts CMOS logic levels; 1µs minimum pulse width. |
| 4 | WDI | Watchdog input - detects rising/falling edges; clears internal timer on each transition; immune to <200ns glitches. |
| 5 | VCC | Supply voltage input - monitored for reset generation; requires 0.1µF bypass capacitor to GND for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in glucose monitors and wearable sensors. |
| Reset threshold accuracy | ±2.5% tolerance over -40°C to +85°C ensures consistent brownout response across temperature extremes. |
| Watchdog glitch immunity | 200ns MR/WDI glitch rejection prevents spurious resets in electrically noisy medical environments. |
| No external components | Integrated MR pullup, precision voltage reference, and timing capacitors eliminate BOM cost and layout area. |
| VCC transient immunity | Withstands 100mV VCC transients ≤40µs duration without asserting reset - critical for switch-mode power supply noise. |
Applications
| Portable Medical Devices | Battery-Powered IoT Sensors |
|---|---|
Use Scenario: Glucose meters and patient monitors powered by CR2032 coin cells operating intermittently over multi-year lifetimes. IC Role / Device Role / Timing Role: Supervises µP power-up, detects brownout during measurement cycles, and triggers watchdog reset if firmware hangs during sensor calibration. Use Value: 170nA ICC extends battery life beyond 5 years; 3.9V threshold matches 3.6V LiMnO₂ nominal voltage; 209s watchdog accommodates slow analog acquisition sequences. |
Use Scenario: Wireless environmental sensors deployed in remote locations, transmitting data every 15 minutes using BLE or LoRa. IC Role / Device Role / Timing Role: Ensures reliable µP boot after cold-start from deep sleep, validates VCC stability before radio wake-up, and recovers from firmware lockups during OTA updates. Use Value: 1200ms reset timeout allows full RF initialization sequence; VCC ≥1.1V reset validity prevents false resets during battery voltage sag under transmit load. |
| Industrial Handheld Terminals | Low-Power Wearables |
Use Scenario: Ruggedized barcode scanners and asset trackers used in warehouses with variable ambient temperatures and ESD exposure. IC Role / Device Role / Timing Role: Monitors 3.3V rail integrity during motor actuation spikes, provides manual reset via front-panel button, and guards against bootloader corruption. Use Value: MR input with 10kΩ internal pullup simplifies button interface; 40µs transient immunity suppresses resets caused by relay coil kickback. |
Use Scenario: Smart fitness bands with optical heart-rate sensors and motion accelerometers running on thin-film batteries. IC Role / Device Role / Timing Role: Coordinates power-on reset across multiple low-voltage subsystems (sensor hub, display driver, BLE SoC) with synchronized release timing. Use Value: Active-high push-pull RESET eliminates external level-shifting; 5-pin SOT23 footprint fits tight 3mm × 3mm PCB real estate constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK39D6S+T | No CT pin; identical 3.9V threshold, 1200ms timeout, and 209s watchdog - differs only in RESET polarity (active-low open-drain). | Requires external pullup resistor and level-shifting for µPs needing active-high reset; less suitable for direct interface. | Select MAX6865UK39D6S+T when active-high push-pull RESET is required to reduce component count and simplify layout. |
| TPS3838K33DBVR | 3.3V fixed threshold, 200ms timeout, no watchdog; 2.5µA ICC - higher quiescent current and narrower feature set. | Limited to basic power-on reset in non-watchdog applications; unsuitable for long-interval firmware monitoring. | Choose MAX6865UK39D6S+T for nanopower operation, adjustable timeout, and watchdog capability in safety-critical portable systems. |
Compared with MAX6864UK39D6S+T and TPS3838K33DBVR, MAX6865UK39D6S+T uniquely combines ultra-low ICC, factory-trimmed 3.9V threshold, 1200ms programmable timeout, and 209s watchdog in an active-high push-pull SOT23 package - enabling simpler, longer-life designs in medical and industrial wearables.
Availability
MAX6865UK39D6S+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered IoT sensors, industrial handheld terminals, and low-power wearables requiring stable component supply across extended product lifecycles.
Supply support for MAX6865UK39D6S+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
MAX6865UK39D6S+T belongs to the MAX68xx nanopower µP supervisory family, designed specifically for ultra-low-power, high-reliability reset and watchdog supervision in battery-constrained portable and medical electronics.
FAQ
What is the reset threshold voltage of MAX6865UK39D6S+T?
The MAX6865UK39D6S+T has a factory-trimmed reset threshold voltage of 3.900V 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 "39" corresponds to 3.900V nominal. The threshold is referenced to VCC and remains stable across temperature and supply variations, ensuring consistent brownout detection in 3.3V/3.6V systems.
Does MAX6865UK39D6S+T include a watchdog timer, and what is its timeout period?
Yes, MAX6865UK39D6S+T includes a watchdog timer with a typical timeout period of 209s, indicated by the "L" suffix in the part number. This is verified in Table 3 (Watchdog Timeout) and the Ordering Information section, which specifies "S" for 3.3s and "L" for 209s. The timer clears on any WDI edge and expires only if WDI remains static beyond this interval, making it suitable for long-cycle firmware supervision.
What type of reset output does MAX6865UK39D6S+T provide?
MAX6865UK39D6S+T provides an active-high push-pull reset output on Pin 1. As confirmed in the MAX6864/MAX6865/MAX6866 Pin Description table and Selector Guide, MAX6865 variants feature "- RESET Active-High Push-Pull Reset Output". This eliminates the need for an external pullup resistor and directly interfaces with µP reset pins requiring high-true assertion, unlike open-drain or active-low variants.
What is the minimum reset timeout period for MAX6865UK39D6S+T?
The minimum reset timeout period for MAX6865UK39D6S+T is 600ms, specified by the "D6" suffix in the part number. Table 4 (Reset Timeout Periods) confirms D6 corresponds to 600–1200ms min–max range. This timeout begins after VCC rises above the 3.9V threshold and MR is deasserted, ensuring sufficient time for µP power stabilization and clock startup before release from reset.
How does MAX6865UK39D6S+T handle supply voltage transients?
MAX6865UK39D6S+T is immune to short VCC transients up to 40µs in duration when the overdrive is 100mV, as shown in the "Maximum VCC Transient Duration vs. Reset Threshold Overdrive" graph (Figure MAX684 toc05). This immunity prevents spurious resets caused by switching regulator noise or ESD events, a key requirement in portable medical and industrial equipment where power integrity is critical.
MAX6865UK39D6S+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:
- 3.9V
- 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
MAX6865UK39D6S+T FAQ
1.How can I place an order for MAX6865UK39D6S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK39D6S+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 MAX6865UK39D6S+T reliable?
The price and inventory of MAX6865UK39D6S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK39D6S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK39D6S+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK39D6S+T transactions.
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4.How is shipping managed for MAX6865UK39D6S+T?
MAX6865UK39D6S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK39D6S+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 MAX6865UK39D6S+T?
For technical support, including MAX6865UK39D6S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK39D6S+T requirements.
6.How does Aetrix verify that MAX6865UK39D6S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK39D6S+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 MAX6865UK39D6S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK39D6S+T?
All MAX6865UK39D6S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK39D6S+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 MAX6865UK39D6S+T part is unused and in its original packaging.
Return procedure for MAX6865UK39D6S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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