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Analog Devices Inc./Maxim Integrated MAX6865UK29D6L+T
- Part No.:
- MAX6865UK29D6L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK29D6L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,459
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Product details
Overview
The MAX6865UK29D6L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, a factory-trimmed 2.925V reset threshold, 1200ms minimum reset timeout, manual reset input (MR), and watchdog timer with 209s typical timeout. It asserts an active-high push-pull RESET signal during VCC brownout, MR assertion, or watchdog expiration-used in battery-powered glucose monitors and portable medical devices.
For engineers reviewing the MAX6865UK29D6L+T datasheet, MAX6865UK29D6L+T pinout, MAX6865UK29D6L+T application, or MAX6865UK29D6L+T equivalent, key selection criteria include guaranteed RESET validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), pin-selectable reset delay absence (fixed D6 timeout), and compatibility with noisy low-power embedded systems requiring fail-safe boot integrity.
Technical Context
This device integrates voltage monitoring, manual reset control, and watchdog timer functionality into a single BiCMOS IC. Its reset logic asserts RESET high when VCC falls below 2.925V, MR is pulled low, or WDI remains static beyond 209s (typ); RESET remains asserted for ≥1200ms after recovery.
The watchdog timer clears on any WDI edge (rising/falling) and is disabled during RESET assertion. The MR input features 10kΩ internal pullup, 1µs minimum pulse width, and 200ns glitch rejection-enabling robust external reset button interfacing without debounce circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at VCC = 1.8V - enables multi-year operation on coin-cell batteries |
| Reset Threshold Voltage | 2.925V (±2.5%) - factory-trimmed for precise brownout detection of 3.0V nominal rails |
| Reset Timeout Period | 600–1200ms (D6 option) - ensures µP completes power-rail stabilization before release |
| Watchdog Timeout | 95–487s (L suffix, typ 209s) - supports long-loop firmware execution in medical telemetry |
| VCC Operating Range | 1.2V to 5.5V - valid operation across Li-ion, alkaline, and regulated 3.3V/2.5V domains |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup resistor in most µP interfaces |
| Guaranteed RESET Validity | Down to VCC = +1.1V - ensures 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 µP reset pin directly; sinks 500µA at VCC ≥ 2.38V |
| 2 | GND | Ground reference - must connect to system ground plane for noise immunity and timing accuracy |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; accepts CMOS-level signals |
| 4 | WDI | Watchdog input - edge-sensitive (150ns min pulse); clears internal timer on rising/falling transitions |
| 5 | VCC | Supply voltage input - monitored for reset generation; bypass with 0.1µF capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current extends battery life in portable medical devices beyond 5 years |
| Reset threshold hysteresis | 0.5% of VTH prevents chatter during slow VCC ramp-up or noise-induced threshold crossings |
| VCC transient immunity | Immune to ≤40µs VCC glitches at 100mV overdrive - avoids spurious resets in electrically noisy environments |
| No external components | Self-contained supervision requires only 0.1µF VCC bypass capacitor - reduces BOM count and PCB area |
| Watchdog edge sensitivity | Detects 150ns WDI pulses - enables reliable software heartbeat signaling even with fast µP I/O toggling |
Applications
| Glucose Monitors | Patient Monitors |
|---|---|
|
Use Scenario: Continuous glucose sensing in handheld meters with Bluetooth LE transmission and disposable sensor cartridges. IC Role / Device Role / Timing Role: Supervises 3.0V LDO output powering ADC, BLE SoC, and display driver; asserts RESET if rail drops during sensor warm-up or battery depletion. Use Value: Prevents corrupted glucose readings due to undervoltage-induced ADC miscalibration or BLE packet loss. |
Use Scenario: Portable ECG and SpO₂ units operating on dual AA alkaline cells with dynamic load switching. IC Role / Device Role / Timing Role: Monitors main 3.3V supply feeding analog front-end and ARM Cortex-M4; triggers watchdog reset if firmware hangs during waveform analysis. Use Value: Ensures clinical-grade data continuity by recovering unresponsive units without user intervention. |
| MP3 Players | Cell Phones (Feature Phones) |
|
Use Scenario: Low-cost audio players using single-cell Li-ion (2.8–4.2V) with integrated Class-D amplifier. IC Role / Device Role / Timing Role: Provides power-on reset and brownout protection for audio codec and flash memory controller; MR tied to mechanical play/pause button. Use Value: Eliminates audio artifacts and file corruption during battery voltage sag under peak amplifier load. |
Use Scenario: Entry-level GSM handsets with 3.6V Li-ion battery and baseband processor requiring deterministic boot sequence. IC Role / Device Role / Timing Role: Generates 1200ms RESET pulse synchronized to PMIC power-rail sequencing; WDI fed by baseband timer interrupt. Use Value: Guarantees full initialization of RF transceiver and SIM interface before network registration attempt. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6365KPA+T | Higher 1.2µA supply current; fixed 2.93V threshold; no watchdog; 200ms reset timeout | Lacks watchdog capability - unsuitable for firmware hang recovery in autonomous devices | Select when only basic power-on reset is needed and ultra-low ICC is not critical |
| TPS3839G33DBVR | 1.5µA ICC; 3.3V fixed threshold; 200ms timeout; no MR or watchdog; open-drain RESET | Requires external pullup; no manual reset or watchdog - limited to simple power-good monitoring | Choose for cost-sensitive consumer electronics where supervision complexity is minimal |
Compared with MAX6865UK29D6L+T, MAX6365KPA+T trades nanopower operation for simpler architecture and lower cost, while TPS3839G33DBVR offers higher integration density but sacrifices watchdog safety and manual reset flexibility required in medical and industrial designs.
Availability
MAX6865UK29D6L+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, and portable MP3 players requiring stable component supply across extended production lifecycles and global regulatory compliance.
Supply support for MAX6865UK29D6L+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 industrial, medical, and automotive applications.
The MAX6854–MAX6869 family delivers nanopower supervision for battery-critical systems-engineered specifically for portable medical instrumentation and ultra-low-power embedded controllers needing fail-safe boot integrity.
FAQ
What is the exact reset threshold voltage of the MAX6865UK29D6L+T?
The MAX6865UK29D6L+T has a factory-trimmed reset threshold voltage of 2.925V, 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 "29" corresponds to 2.925V nominal. The MAX6865UK29D6L+T maintains this specification without external calibration or trimming components.
Does the MAX6865UK29D6L+T support active-low reset output?
No, the MAX6865UK29D6L+T provides an active-high push-pull RESET output only. Per the Selector Guide and MAX6865 pin description, it belongs to the MAX6865 variant group (active-high push-pull), unlike MAX6864 (active-low) or MAX6866 (open-drain). The MAX6865UK29D6L+T cannot be configured for active-low operation-designers requiring that polarity must select MAX6864UK29D6L+T instead.
What is the watchdog timeout behavior of the MAX6865UK29D6L+T during power-up?
The watchdog timer in the MAX6865UK29D6L+T is disabled while RESET is asserted and resumes counting only after RESET deasserts. During power-up, the device holds RESET high until VCC exceeds 2.925V and the 1200ms timeout expires-so WDI monitoring begins only after the µP is fully released. This prevents false timeouts during initial boot sequences, ensuring the MAX6865UK29D6L+T aligns watchdog activation with functional firmware execution.
Can the MAX6865UK29D6L+T operate reliably at VCC = 1.3V?
Yes, the MAX6865UK29D6L+T guarantees functional operation and valid RESET assertion down to VCC = +1.1V, per Absolute Maximum Ratings and Electrical Characteristics tables. At 1.3V, it draws ~190nA (typ), maintains 2.925V threshold tracking, and sustains MR input recognition and WDI edge detection. This makes the MAX6865UK29D6L+T suitable for end-of-battery-life scenarios in single-cell alkaline or LiFePO₄ systems.
Is an external pullup resistor required for the RESET output of the MAX6865UK29D6L+T?
No, an external pullup resistor is not required for the MAX6865UK29D6L+T because its RESET output is active-high push-pull. The internal driver actively sources current to pull RESET high (VOH ≥ 0.8 × VCC) and sinks current to pull it low (VOL ≤ 0.3V). Unlike open-drain variants, the MAX6865UK29D6L+T drives the reset line directly-reducing component count and eliminating pullup-related leakage paths in battery-critical designs.
MAX6865UK29D6L+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:
- 2.925V
- 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
MAX6865UK29D6L+T FAQ
1.How can I place an order for MAX6865UK29D6L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK29D6L+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 MAX6865UK29D6L+T reliable?
The price and inventory of MAX6865UK29D6L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK29D6L+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK29D6L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK29D6L+T transactions.
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4.How is shipping managed for MAX6865UK29D6L+T?
MAX6865UK29D6L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK29D6L+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 MAX6865UK29D6L+T?
For technical support, including MAX6865UK29D6L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK29D6L+T requirements.
6.How does Aetrix verify that MAX6865UK29D6L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK29D6L+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 MAX6865UK29D6L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK29D6L+T?
All MAX6865UK29D6L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK29D6L+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 MAX6865UK29D6L+T part is unused and in its original packaging.
Return procedure for MAX6865UK29D6L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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