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Analog Devices Inc./Maxim Integrated MAX6865UK19D3L+T
- Part No.:
- MAX6865UK19D3L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK19D3L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,631
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Product details
Overview
The MAX6865UK19D3L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 1.9V reset threshold (±2.5%), 300ms minimum reset timeout (D3), and watchdog timer with 209s typical timeout (L suffix). It monitors VCC, responds to manual reset (MR), and triggers reset on watchdog timeout - designed for battery-powered medical and portable electronics requiring guaranteed reset validity down to VCC = +1.1V.
For engineers reviewing the MAX6865UK19D3L+T datasheet, MAX6865UK19D3L+T pinout, MAX6865UK19D3L+T application, or MAX6865UK19D3L+T equivalent, this page delivers verified functional identity, confirmed SOT23-5 pin mapping, exact reset/wdog timing values, and real-world design implications - not generic supervisory IC descriptions.
Technical Context
The MAX6865UK19D3L+T integrates voltage monitoring, manual reset input (MR), and watchdog timer (WDI) in a single BiCMOS IC. Its reset assertion logic combines three independent triggers: VCC falling below 1.9V, MR pulled low, or WDI inactivity exceeding 209s (typ). The internal reset timeout generator enforces a fixed 300ms (min) deassertion delay after any trigger condition clears.
It uses push-pull active-high RESET output referenced to VCC, with VOH ≥ 0.8×VCC at ISOURCE = 500µA and VOL ≤ 0.3V at ISINK = 1.2mA. Immunity to short VCC transients (<40µs at 100mV overdrive) and guaranteed operation down to VCC = +1.1V enable robust use in noisy, low-voltage battery systems.
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 Voltage | 1.9V ±2.5% - factory-trimmed for precise brownout detection at 1.9V nominal rail |
| Reset Timeout Period | 300ms minimum (D3 option) - ensures µP completes power-up initialization before release |
| Watchdog Timeout | 209s typical (L suffix) - supports long idle intervals in low-power sleep modes without false resets |
| VCC Operating Range | 1.2V to 5.5V - compatible with Li-ion, Li-Po, and multi-rail embedded systems |
| RESET Output Type | Push-pull active-high - eliminates need for external pullup and simplifies interface to µP reset inputs |
| Guaranteed Reset Validity | Down to VCC = +1.1V - maintains deterministic reset state during deep brownout |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, -40°C to +85°C operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives high when asserted; requires no external components |
| 2 | GND | Ground reference - must be connected to system ground plane for stable reset threshold |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; accepts CMOS logic levels |
| 4 | WDI | Watchdog input - edge-sensitive; reset triggered if no transition occurs within 209s (typ) |
| 5 | VCC | Supply voltage input - monitored for reset; bypass with 0.1µF capacitor to GND per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical - reduces quiescent drain in always-on patient monitors and wearables |
| Immunity to VCC transients | Rejects <40µs glitches at 100mV overdrive - prevents spurious resets in electrically noisy environments |
| No external components required | Integrated MR pullup, precision threshold, and timeout - eliminates BOM cost and layout area |
| Valid reset down to 1.1V | Ensures deterministic behavior during deep brownout - critical for safe shutdown in medical devices |
| Watchdog edge sensitivity | Detects 150ns pulses - allows tight software polling intervals without missing watchdog refreshes |
Applications
| Glucose Monitors | Patient Vital Sign Loggers |
|---|---|
Use Scenario: Continuous subcutaneous glucose sensing with Bluetooth LE transmission and low-power sleep cycles. IC Role / Device Role / Timing Role: Supervisory circuit asserting reset on VCC brownout or firmware hang; watchdog enforces periodic sensor calibration and comms handshaking. Use Value: 209s watchdog timeout aligns with clinical data upload intervals; 1.9V threshold matches single-LiPo cell discharge curve. |
Use Scenario: Portable ECG/SpO₂ recorder with 7-day battery life and automatic fault recovery on memory corruption. IC Role / Device Role / Timing Role: Resets microcontroller on power instability or unresponsive firmware; 300ms timeout ensures flash write completion before boot. Use Value: 170nA supply current extends battery runtime; guaranteed reset down to 1.1V prevents undefined state during end-of-life battery drop. |
| Industrial Handheld Scanners | Smart Wearable Health Trackers |
Use Scenario: Rugged barcode scanner powered by rechargeable Li-ion, subject to mechanical shock-induced power noise. IC Role / Device Role / Timing Role: Detects VCC dips from motor startup or ESD events; MR enables field-service hard reset via button press. Use Value: Transient immunity rejects >100kHz switching noise; internal MR pullup eliminates external resistor. |
Use Scenario: Arm-worn heart rate monitor using coin-cell battery and intermittent BLE advertising. IC Role / Device Role / Timing Role: Provides fail-safe reset during RF interference-induced MCU lockup; watchdog monitors main loop execution. Use Value: Push-pull active-high RESET directly interfaces with ARM Cortex-M reset pin; no level-shifting needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK19D3L+T | Same 1.9V threshold, 300ms timeout, 209s watchdog, but active-low push-pull RESET output | Requires µP with active-low reset input; incompatible with active-high-only designs | Select only if target µP reset pin is active-low and board layout cannot accommodate signal inversion |
| TPS3837K25DBVR | 1.9V threshold, 200ms timeout, no watchdog; 1.5µA ICC (vs. 170nA); SOT23-5 pin-compatible | Lacks watchdog functionality; higher supply current limits battery life in ultra-low-power applications | Use where watchdog is unnecessary and cost is prioritized over nanopower operation |
Compared with MAX6865UK19D3L+T, MAX6864UK19D3L+T offers identical supervision specs but inverted RESET polarity, while TPS3837K25DBVR trades nanopower and watchdog capability for lower unit cost and broader distributor availability - making it suitable only for non-battery-critical industrial controls.
Availability
MAX6865UK19D3L+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign loggers, industrial handheld scanners, and smart wearable health trackers requiring stable component supply across extended production lifecycles.
Supply support for MAX6865UK19D3L+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 connectivity in demanding environments.
The MAX6854–MAX6869 family delivers nanopower supervisory functions specifically for battery-constrained medical, portable, and IoT endpoints - emphasizing ultra-low ICC, wide VCC range, and reliable reset under transient conditions.
FAQ
What is the exact reset threshold voltage of the MAX6865UK19D3L+T?
The MAX6865UK19D3L+T has a factory-trimmed reset threshold of 1.9V with ±2.5% tolerance over temperature (−40°C to +85°C), as defined by the "19" suffix in its part number per Maxim's Threshold Suffix Guide. This value is measured at VCC falling and guarantees reset assertion before critical brownout of 1.8V logic rails.
Does the MAX6865UK19D3L+T require external components for basic operation?
No - the MAX6865UK19D3L+T operates autonomously with no external components required. It includes an internal 10kΩ pullup on MR, precision voltage reference, fixed timeout generator, and push-pull active-high RESET output. Only a 0.1µF VCC bypass capacitor is recommended for noise immunity, per Maxim's layout guidance.
How does the watchdog timer in the MAX6865UK19D3L+T function?
The MAX6865UK19D3L+T watchdog timer monitors transitions on the WDI pin and expires if no rising or falling edge occurs within 209s (typical, L suffix). Upon expiration, it asserts the active-high RESET for 300ms (min). The timer clears on any WDI edge, MR assertion, or RESET assertion - enabling robust firmware hang detection without additional hardware.
What is the supply current of the MAX6865UK19D3L+T at 1.8V and 25°C?
The MAX6865UK19D3L+T draws 170nA typical supply current at VCC = 1.8V and TA = +25°C, as specified in the Electrical Characteristics table. This ultra-low ICC enables multi-year operation from CR2032 coin cells in always-on medical sensors and wearables, with minimal impact on battery self-discharge.
Is the MAX6865UK19D3L+T pin-compatible with other devices in the MAX68xx family?
Yes - the MAX6865UK19D3L+T uses the standard 5-pin SOT23-5 footprint shared across the MAX6854–MAX6869 series. Pin 1 is RESET, Pin 2 is GND, Pin 3 is MR, Pin 4 is WDI, and Pin 5 is VCC. This allows direct substitution with other MAX686x variants (e.g., MAX6864/MAX6866) when RESET polarity or timeout options differ, provided PCB layout accommodates functional differences.
MAX6865UK19D3L+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:
- 1.9V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK19D3L+T FAQ
1.How can I place an order for MAX6865UK19D3L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK19D3L+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 MAX6865UK19D3L+T reliable?
The price and inventory of MAX6865UK19D3L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK19D3L+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK19D3L+T?
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MAX6865UK19D3L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK19D3L+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 MAX6865UK19D3L+T?
For technical support, including MAX6865UK19D3L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK19D3L+T requirements.
6.How does Aetrix verify that MAX6865UK19D3L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK19D3L+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 MAX6865UK19D3L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK19D3L+T?
All MAX6865UK19D3L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK19D3L+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 MAX6865UK19D3L+T part is unused and in its original packaging.
Return procedure for MAX6865UK19D3L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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