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Analog Devices Inc./Maxim Integrated MAX6865UK19D4L+T
- Part No.:
- MAX6865UK19D4L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK19D4L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,904
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Product details
Overview
The MAX6865UK19D4L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 1.9V reset threshold (±2.5%), 1200ms minimum reset timeout, manual reset input (MR), and watchdog timer with 209s typical timeout. It asserts active-low push-pull RESET during VCC brownout, MR assertion, or watchdog expiration - used in battery-powered medical monitors and portable instrumentation.
For engineers reviewing the MAX6865UK19D4L+T datasheet, MAX6865UK19D4L+T pinout, MAX6865UK19D4L+T application, or MAX6865UK19D4L+T equivalent, key selection criteria include guaranteed RESET validity down to VCC = +1.1V, immunity to sub-40µs VCC transients at 100mV overdrive, pin-selectable reset output type, and compatibility with 1.2V–5.5V supply rails.
Technical Context
This device integrates voltage monitoring, manual reset control, and watchdog timer functionality in a single BiCMOS IC. Its reset logic combines VCC threshold detection (1.9V ±2.5%), MR edge-triggered assertion, and WDI activity monitoring - all synchronized to a precision internal timeout generator.
The watchdog timer clears on any WDI edge (rising/falling) or MR assertion, and expires only after >209s of WDI inactivity (typ). Reset deassertion requires both VCC > VTH +150mV and completion of the 1200ms timeout period - ensuring robust power-up sequencing for low-voltage µPs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at +25°C - enables multi-year operation on coin-cell batteries in always-on medical sensors. |
| Reset Threshold | 1.900V ±2.5% - factory-trimmed for precise brownout detection on 1.8V/2.5V logic rails. |
| Reset Timeout | 1200ms min - ensures full µP initialization and firmware boot before release of RESET signal. |
| Watchdog Timeout | 209s typ (L-suffix) - supports long-cycle firmware tasks without spurious resets in glucose monitors. |
| VCC Operating Range | 1.2V to 5.5V - operates across Li-ion, alkaline, and regulated 3.3V/5V supplies without external biasing. |
| RESET Validity | Guaranteed to VCC = +1.1V - maintains deterministic reset state during deep brownout conditions. |
| MR Glitch Rejection | 200ns - rejects EMI-induced noise on manual reset lines in handheld diagnostic tools. |
Pinout & Package
5-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), lead-free, RoHS-compliant. Pin 1 is RESET (active-low push-pull), Pin 2 is GND, Pin 3 is MR (active-low manual reset), Pin 4 is WDI (watchdog input), Pin 5 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull output; sinks 1.2mA at VCC ≥ 2.38V - drives µP reset directly without pullup resistor. |
| 2 | GND | Ground reference for all internal comparators and timers - must connect to system ground plane with low impedance. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ - accepts CMOS-level signals or momentary switch to GND. |
| 4 | WDI | Watchdog input; detects edges ≥150ns wide - toggled by µP firmware to prevent timeout; high/low states longer than 209s trigger reset. |
| 5 | VCC | Supply input and monitored rail; requires 0.1µF ceramic bypass capacitor to GND - powers internal circuitry and sets reset threshold reference. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in portable patient monitors using CR2032 cells. |
| Reset threshold accuracy | ±2.5% tolerance over -40°C to +85°C - eliminates need for external calibration in field-deployed devices. |
| Transient immunity | Immune to VCC glitches ≤40µs at 100mV overdrive - prevents false resets in electrically noisy industrial handhelds. |
| No external components | Self-contained supervision - no timing capacitors, pullups, or voltage dividers required for basic operation. |
| Watchdog edge sensitivity | Detects WDI pulses as short as 150ns - accommodates fast µP GPIO toggling without additional signal conditioning. |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Loggers |
|---|---|
|
Use Scenario: Continuous glucose sensing with Bluetooth LE transmission and low-power sleep cycles. IC Role / Device Role / Timing Role: Supervises 1.8V MCU power rail and validates firmware execution via WDI polling every 200s. Use Value: 209s watchdog timeout matches sensor sampling interval; 170nA ICC extends CR2032 battery life beyond 24 months. |
Use Scenario: Portable ECG/SpO₂ recorder with intermittent data upload and 7-day memory retention. IC Role / Device Role / Timing Role: Monitors 3.3V system rail and asserts RESET during brownout events below 3.135V. Use Value: 1.9V reset threshold provides 165mV hysteresis margin; 1200ms timeout ensures full RAM initialization before µP boot. |
| Handheld Diagnostic Tools | Wearable Health Sensors |
|
Use Scenario: Battery-powered ultrasound probe with real-time image processing and thermal shutdown. IC Role / Device Role / Timing Role: Provides manual reset via front-panel button and detects µP lockup during FFT computation. Use Value: MR input with 200ns glitch rejection prevents accidental reset from ESD events; push-pull RESET drives FPGA configuration logic directly. |
Use Scenario: Skin-contact heart rate monitor with motion artifact compensation and BLE advertising. IC Role / Device Role / Timing Role: Supervises 1.2V core voltage and validates firmware integrity via periodic WDI toggles. Use Value: Guaranteed RESET validity to VCC = +1.1V ensures deterministic reset even during deep discharge of LiPo cell. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK19D4L+T | No CT pin; identical 1.9V threshold, 1200ms timeout, and 209s watchdog - but lacks pin-selectable reset delay. | Suitable where fixed 1200ms timeout suffices; not usable if design requires dual timeout options. | Select MAX6864UK19D4L+T when CT functionality is unnecessary and cost optimization is prioritized. |
| TPS3838K33DBVR | 3.3V fixed threshold; 200ms timeout; no watchdog; 1.6µA ICC - higher quiescent current, no WDI capability. | Limited to simple power-on reset in non-critical 3.3V systems without firmware supervision needs. | Choose TPS3838K33DBVR only for cost-sensitive, non-watchdog applications with stable 3.3V rails. |
Compared with MAX6864UK19D4L+T, the MAX6865UK19D4L+T adds no functional difference but shares identical timing and electrical specs; versus TPS3838K33DBVR, it delivers 90× lower ICC, programmable threshold, and critical watchdog supervision for safety-critical medical firmware.
Availability
MAX6865UK19D4L+T is available at Aetrix Electronics and suitable for glucose monitors, patient loggers, handheld diagnostics, and wearable health sensors requiring stable component supply across extended production lifecycles.
Supply support for MAX6865UK19D4L+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 industrial, medical, and communications applications - emphasizing ultra-low power, high reliability, and small form factor.
The MAX6854–MAX6869 family targets battery-powered medical and portable electronics, delivering nanopower supervision with integrated watchdog and manual reset to ensure firmware integrity in safety-critical systems.
FAQ
What is the exact reset threshold voltage of the MAX6865UK19D4L+T?
The MAX6865UK19D4L+T has a factory-trimmed reset threshold of 1.900V with ±2.5% tolerance over -40°C to +85°C, corresponding to the '19' suffix per Maxim's Threshold Suffix Guide. This value is measured at VCC falling and guarantees reliable brownout detection for 1.8V logic systems.
Does the MAX6865UK19D4L+T support active-high reset output?
No, the MAX6865UK19D4L+T provides only active-low push-pull RESET output (Pin 1). The '65' in the part number denotes the MAX6865 variant, which - per the Selector Guide and Pin Description - is configured for active-low push-pull, unlike the MAX6864 (active-low) or MAX6866 (open-drain).
What is the watchdog timeout behavior when the µP fails to toggle WDI?
When WDI remains static (high or low) beyond 209s (typical, L-suffix), the MAX6865UK19D4L+T asserts RESET for the full 1200ms timeout period. The watchdog timer resets on any WDI edge, MR assertion, or active RESET - ensuring recovery from firmware hangs in medical algorithms.
Can the MAX6865UK19D4L+T operate reliably at VCC = 1.2V?
Yes, the MAX6865UK19D4L+T is fully specified from VCC = 1.2V to 5.5V. Its 170nA supply current and guaranteed RESET validity down to VCC = +1.1V enable robust operation in deep brownout conditions common in aging lithium coin cells powering portable diagnostics.
Is an external pullup resistor required for the RESET output of the MAX6865UK19D4L+T?
No, the MAX6865UK19D4L+T features a push-pull active-low RESET output (Pin 1), eliminating the need for an external pullup. It sources up to 500µA and sinks up to 1.2mA, allowing direct connection to µP reset inputs without additional components.
MAX6865UK19D4L+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:
- 1.2s Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK19D4L+T FAQ
1.How can I place an order for MAX6865UK19D4L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK19D4L+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 MAX6865UK19D4L+T reliable?
The price and inventory of MAX6865UK19D4L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK19D4L+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK19D4L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK19D4L+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6865UK19D4L+T?
MAX6865UK19D4L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK19D4L+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 MAX6865UK19D4L+T?
For technical support, including MAX6865UK19D4L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK19D4L+T requirements.
6.How does Aetrix verify that MAX6865UK19D4L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK19D4L+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 MAX6865UK19D4L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK19D4L+T?
All MAX6865UK19D4L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK19D4L+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 MAX6865UK19D4L+T part is unused and in its original packaging.
Return procedure for MAX6865UK19D4L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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