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Analog Devices Inc./Maxim Integrated MAX6865UK39D2S+T
- Part No.:
- MAX6865UK39D2S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK39D2S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,295
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Product details
Overview
The MAX6865UK39D2S+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%), 40ms minimum reset timeout, and integrated watchdog timer with 3.3s typical timeout. It monitors VCC, responds to manual reset (MR), and asserts active-low push-pull RESET during brownout or watchdog expiration - used in battery-powered glucose monitors and portable medical devices.
For engineers reviewing the MAX6865UK39D2S+T datasheet, MAX6865UK39D2S+T pinout, MAX6865UK39D2S+T application, or MAX6865UK39D2S+T equivalent, key selection criteria include its 3.9V reset threshold accuracy, 40ms reset timeout, 3.3s watchdog period, guaranteed RESET validity down to VCC = +1.1V, and immunity to sub-40µs VCC transients at 100mV overdrive.
Technical Context
This device integrates voltage monitoring, manual reset input (MR), and watchdog timer (WDI) in a single BiCMOS IC. The reset function triggers on VCC falling below 3.9V, MR assertion, or WDI inactivity exceeding 3.3s; RESET remains asserted for ≥40ms after recovery.
The watchdog clears on any WDI edge (rising/falling), MR assertion, or RESET assertion, and tolerates pulses as short as 150ns. Internal 10kΩ MR pullup enables direct switch-to-GND implementation without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.900V ±2.5% (factory-trimmed; ensures reliable brownout detection at nominal 3.3V/3.9V rail) |
| Reset Timeout | 40ms min (D2 option; guarantees µP reset hold time sufficient for full power stabilization) |
| Watchdog Timeout | 3.3s typ (S suffix; provides robust software execution monitoring for low-duty-cycle embedded firmware) |
| Supply Current | 170nA typ at +25°C (enables multi-year operation on coin-cell batteries in portable medical devices) |
| VCC Validity Range | 1.1V to 5.5V (RESET remains functional down to 1.1V, supporting deep brownout recovery) |
| Reset Output Type | Active-low push-pull (no external pullup required; drives standard CMOS reset inputs directly) |
| VCC Transient Immunity | No reset for ≤40µs transients at 100mV overdrive (prevents false resets in noisy battery-powered systems) |
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-low push-pull reset output; sinks current when asserted, referenced to VCC; valid down to VCC = 1.1V |
| 2 | GND | Ground reference for all internal circuits; must connect to system ground plane |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; accepts CMOS logic or open-drain signals |
| 4 | WDI | Watchdog input; edge-sensitive (150ns min pulse); clears internal timer on rising/falling transitions |
| 5 | VCC | Supply voltage input and monitored rail; 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 coin-cell–powered wearables |
| Factory-trimmed VTH | 3.900V ±2.5% eliminates external resistor networks and calibration overhead |
| Integrated watchdog | 3.3s timeout (S suffix) detects firmware hangs without requiring external timing components |
| No external components | Internal MR pullup, no RC network needed for reset timing - reduces BOM count and PCB area |
| VCC transient immunity | Immune to ≤40µs glitches at 100mV overdrive - avoids false resets in ESD-prone portable systems |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
Use Scenario: Continuous glucose sensing with Bluetooth LE transmission in disposable wearable patches. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output, asserts RESET on battery sag or firmware lockup, and triggers watchdog if sensor readout loop stalls. Use Value: Ensures deterministic recovery from brownout or code hang without user intervention, meeting IEC 60601-1 safety requirements. |
Use Scenario: Portable ECG recorder with rechargeable Li-ion battery and low-power MCU. IC Role / Device Role / Timing Role: Monitors main 3.9V rail, initiates hard reset on undervoltage, and validates firmware liveness via WDI toggling during ADC sampling cycles. Use Value: Guarantees reset assertion down to VCC = 1.1V, enabling safe shutdown before battery cutoff, and prevents silent data corruption. |
| MP3 Players | Smart Pagers |
Use Scenario: Flash-based audio player powered by single AAA alkaline cell (1.0–1.6V range). IC Role / Device Role / Timing Role: Provides precise 3.9V reset threshold tracking across battery discharge curve; uses MR for user-initiated reboot. Use Value: Eliminates need for discrete voltage divider + comparator, reducing component count while maintaining ±2.5% threshold accuracy over temperature. |
Use Scenario: Two-way pager with intermittent RF transmission and long standby intervals. IC Role / Device Role / Timing Role: Supervises 3.3V PMIC output; watchdog verifies baseband processor responsiveness between paging bursts. Use Value: 3.3s watchdog timeout aligns with maximum allowable idle duration before protocol timeout, preventing missed message delivery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK39D2S+T | No CT pin; identical 3.9V threshold, 40ms timeout, 3.3s watchdog, and pinout - differs only in absence of CT select functionality | Suitable where fixed 40ms timeout suffices; not usable if pin-selectable timeout is required | Select MAX6864UK39D2S+T when CT functionality is unnecessary and cost optimization is prioritized |
| TPS3836K33DBVR | 3.3V reset threshold (not 3.9V); 200ms timeout; no watchdog; SOT23-5 package; 1.6µA ICC | Lacks watchdog and manual reset; higher supply current limits battery life in ultra-low-power designs | Choose TPS3836K33DBVR only for non-watchdog 3.3V rail supervision where TI ecosystem compatibility is mandatory |
Compared with MAX6864UK39D2S+T, the MAX6865UK39D2S+T offers identical core supervision but is not interchangeable due to CT pin presence; versus TPS3836K33DBVR, it delivers 10× lower ICC, 3.9V threshold precision, and integrated watchdog - critical for medical-grade reliability.
Availability
MAX6865UK39D2S+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, MP3 players, and smart pagers requiring stable component supply with long-term lifecycle support and traceable sourcing.
Supply support for MAX6865UK39D2S+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 industrial, medical, and portable systems.
The MAX6865UK39D2S+T belongs to the MAX68xx nanopower supervisory family, engineered specifically for ultra-low-current battery-powered medical and consumer electronics requiring guaranteed reset behavior under brownout and firmware fault conditions.
FAQ
What is the exact reset threshold voltage of the MAX6865UK39D2S+T?
The MAX6865UK39D2S+T has a factory-trimmed reset threshold of 3.900V with ±2.5% tolerance over temperature (-40°C to +85°C), corresponding to the '39' suffix per Maxim's Threshold Suffix Guide. This value is guaranteed by design and tested during production, ensuring accurate brownout detection for 3.3V/3.9V systems without external calibration.
Does the MAX6865UK39D2S+T include a watchdog timer, and what is its timeout period?
Yes, the MAX6865UK39D2S+T includes an integrated watchdog timer with a typical timeout period of 3.3s, indicated by the 'S' suffix in the part number. The timer clears on any edge (rising or falling) at the WDI pin and expires only if WDI remains static beyond this period, triggering a reset for the configured 40ms timeout.
What is the function of Pin 1 (RESET) on the MAX6865UK39D2S+T?
Pin 1 of the MAX6865UK39D2S+T is the active-low push-pull RESET output. It drives low during VCC brownout, MR assertion, or watchdog timeout, and remains low for ≥40ms after recovery. Unlike open-drain variants, it requires no external pullup and is referenced to VCC, simplifying interface to standard CMOS reset inputs.
Can the MAX6865UK39D2S+T operate reliably at very low supply voltages?
Yes, the MAX6865UK39D2S+T guarantees valid RESET output down to VCC = +1.1V, enabling robust operation during deep battery discharge. Its ultra-low 170nA supply current further extends usable battery range, making it suitable for coin-cell–powered devices where voltage drops below 1.5V during end-of-life.
How does the MAX6865UK39D2S+T handle short VCC transients?
The MAX6865UK39D2S+T is immune to VCC transients ≤40µs in duration when the overdrive is 100mV above the 3.9V threshold, per the "Maximum VCC Transient Duration vs. Reset Threshold Overdrive" curve. This prevents false resets caused by ESD events or switching noise in portable medical and consumer equipment.
MAX6865UK39D2S+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:
- 40ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK39D2S+T FAQ
1.How can I place an order for MAX6865UK39D2S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK39D2S+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 MAX6865UK39D2S+T reliable?
The price and inventory of MAX6865UK39D2S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK39D2S+T is usually 5 days.
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Once your MAX6865UK39D2S+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 MAX6865UK39D2S+T?
For technical support, including MAX6865UK39D2S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK39D2S+T requirements.
6.How does Aetrix verify that MAX6865UK39D2S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK39D2S+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 MAX6865UK39D2S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK39D2S+T?
All MAX6865UK39D2S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK39D2S+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 MAX6865UK39D2S+T part is unused and in its original packaging.
Return procedure for MAX6865UK39D2S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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