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Analog Devices Inc./Maxim Integrated MAX6865UK29D2L+T
- Part No.:
- MAX6865UK29D2L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK29D2L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,335
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Product details
Overview
The MAX6865UK29D2L+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, 40ms minimum reset timeout, and integrated watchdog timer with 209s typical timeout. It monitors VCC, responds to manual reset (MR), and asserts active-high push-pull RESET during brownout or watchdog expiration - used in battery-powered glucose monitors and portable medical devices.
For engineers reviewing the MAX6865UK29D2L+T datasheet, MAX6865UK29D2L+T pinout, MAX6865UK29D2L+T application, or MAX6865UK29D2L+T equivalent, key selection criteria include its guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), pin-selectable reset output type, and compatibility with low-voltage µP systems operating from 1.2V to 5.5V.
Technical Context
The MAX6865UK29D2L+T implements a precision bandgap-based voltage monitor with ±2.5% threshold accuracy over temperature, coupled with a digital watchdog timer that clears on any WDI edge and expires if WDI remains static beyond 209s (typ). Its internal 10kΩ MR pullup and glitch rejection (200ns) enable robust manual reset handling without external components.
It uses BiCMOS process technology (2848 transistors) to achieve nanoscale quiescent current while maintaining push-pull RESET output drive capability: VOH ≥ 0.8×VCC at ISOURCE = 500µA and VOL ≤ 0.3V at ISINK = 1.2mA for VCC ≥ 2.38V - ensuring reliable interface with modern low-voltage microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at VCC = 1.8V; enables multi-year operation on coin-cell batteries in portable medical devices. |
| Reset Threshold Voltage | 2.925V (factory-trimmed, ±2.5%); precisely matches 3.0V nominal rail monitoring with margin for brownout detection. |
| Reset Timeout Period | 40ms minimum (D2 option); ensures µP completes power-up initialization before release from reset. |
| Watchdog Timeout | 209s typical (L suffix); supports long-loop firmware execution while detecting catastrophic hangs in embedded health monitors. |
| VCC Operating Range | 1.2V to 5.5V; allows direct integration into diverse low-power subsystems including 1.8V and 3.3V domains. |
| Reset Output Type | Active-high push-pull; eliminates need for external pullup and simplifies interface to µP reset inputs requiring high-true assertion. |
| Guaranteed Reset Validity | Down to VCC = +1.1V; ensures deterministic reset behavior during deep brownout conditions before system collapse. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, footprint compatible with industry-standard 5-pin SOT23 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output; drives high during fault condition (VCC < VTH, MR low, or WDI timeout); referenced to VCC. |
| 2 | GND | Ground reference for all internal circuitry; must be connected to system ground plane with low-impedance path. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; accepts CMOS logic levels; 250ns MR-to-reset delay. |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); clears internal timer on transition; 150ns minimum pulse width supported. |
| 5 | VCC | Primary supply and monitored voltage rail; requires 0.1µF bypass capacitor to GND for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical enables >10-year battery life in single-CR2032-powered patient monitors. |
| Factory-trimmed reset threshold | 2.925V ±2.5% eliminates external resistor divider calibration and reduces BOM count. |
| Watchdog timer with edge-clearing | 209s timeout with automatic reset on WDI transitions prevents false triggers during normal software polling. |
| Immunity to VCC transients | Rejects transients ≤40µs at 100mV overdrive - critical for noisy switch-mode power supply environments. |
| No external components required | Integrated MR pullup, precision voltage reference, and timing elements reduce PCB area and assembly cost. |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Monitors |
|---|---|
|
Use Scenario: Continuous glucose meters powered by coin-cell batteries with intermittent sensor sampling and Bluetooth LE transmission. IC Role / Device Role / Timing Role: Supervisory IC asserting active-high RESET to ARM Cortex-M0+ MCU during VCC brownout or firmware hang detected via WDI. Use Value: 170nA supply current extends battery life beyond 2 years; 209s watchdog timeout accommodates extended sleep cycles without spurious resets. |
Use Scenario: Portable ECG/SpO₂ monitors operating from rechargeable Li-ion cells with dynamic load switching. IC Role / Device Role / Timing Role: Voltage supervisor ensuring deterministic reset initiation when main 3.3V rail drops below 2.925V during battery discharge or transient load surge. Use Value: Guaranteed reset validity down to VCC = +1.1V prevents undefined MCU state during final battery depletion phase. |
| Industrial Handheld Terminals | Low-Power IoT Edge Sensors |
|
Use Scenario: Ruggedized barcode scanners with cold-temperature operation (-40°C) and frequent button-activated resets. IC Role / Device Role / Timing Role: Manual reset interface via MR pin with 250ns response and 200ns glitch rejection, eliminating need for external debounce hardware. Use Value: Internal 10kΩ MR pullup and noise-immune design allow direct connection of momentary switch to GND - reducing component count and board space. |
Use Scenario: Wireless environmental sensors transmitting data every 5 minutes using sub-GHz RF, powered by energy harvesting. IC Role / Device Role / Timing Role: Nanopower supervisor enabling wake-up reset coordination between harvested energy storage and µP boot sequence. Use Value: 1.2V minimum operating voltage allows operation during lowest charge states of supercapacitor storage, maximizing usable energy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK29D2L+T | Same 2.925V threshold, 40ms timeout, and 209s watchdog, but features active-low push-pull RESET output instead of active-high. | Requires µP with active-low reset input; incompatible with systems expecting high-true reset assertion. | Select MAX6864UK29D2L+T only when interfacing to legacy µPs with active-low reset pins and no level-shifting capability. |
| TPS3837K29DBVR | 2.93V threshold, 200ms minimum timeout, no watchdog timer, 1.6µA supply current - 9× higher than MAX6865UK29D2L+T. | Suitable for basic power-on reset only; cannot replace watchdog functionality in safety-critical medical firmware monitoring. | Choose TPS3837K29DBVR only for cost-sensitive, non-watchdog applications where 1.6µA ICC is acceptable and longer reset hold time is tolerable. |
Compared with MAX6864UK29D2L+T, the MAX6865UK29D2L+T provides active-high RESET for direct compatibility with modern low-voltage µPs; compared with TPS3837K29DBVR, it delivers 10× lower supply current and integrated watchdog - essential for battery longevity and functional safety in portable diagnostics.
Availability
MAX6865UK29D2L+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered instrumentation, and low-power IoT edge nodes requiring stable component supply across extended product lifecycles.
Supply support for MAX6865UK29D2L+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 MAX6865UK29D2L+T belongs to the MAX6854–MAX6869 nanopower µP supervisory family, engineered specifically for ultra-long-life battery-operated equipment requiring guaranteed reset integrity, watchdog supervision, and minimal quiescent current.
FAQ
What is the exact reset threshold voltage of the MAX6865UK29D2L+T?
The MAX6865UK29D2L+T has a factory-trimmed reset threshold voltage of 2.925V, with ±2.5% tolerance over the full -40°C to +85°C temperature range. This value is fixed per the "29" suffix in the part number and is verified in the Threshold Suffix Guide (Table 2) of the official datasheet. The MAX6865UK29D2L+T maintains this accuracy without external calibration components.
Does the MAX6865UK29D2L+T support active-high or active-low reset output?
The MAX6865UK29D2L+T provides an active-high push-pull reset output, as confirmed by its pin description (Pin 1 = RESET, active-high) and Selector Guide entry. This differs from the MAX6864UK29D2L+T (active-low) and MAX6866UK29D2L+T (open-drain active-low). The MAX6865UK29D2L+T drives high during reset assertion and deasserts low - matching µP reset inputs requiring high-true signaling.
What is the watchdog timeout period for the MAX6865UK29D2L+T?
The MAX6865UK29D2L+T features a watchdog timeout period of 209s typical (minimum 95s, maximum 487s), denoted by the "L" suffix in the part number. This long timeout supports firmware with extended idle or sleep intervals while still detecting catastrophic hangs. The watchdog timer clears on any rising or falling edge at the WDI pin and resumes counting immediately after reset deassertion.
Can the MAX6865UK29D2L+T operate reliably below 1.8V?
Yes - the MAX6865UK29D2L+T operates from 1.2V to 5.5V and guarantees valid reset output down to VCC = +1.1V, as specified in the Electrical Characteristics table. At 1.2V supply, its typical supply current is 190nA, making it suitable for deep-brownout supervision in energy-harvesting and ultra-low-voltage systems. The MAX6865UK29D2L+T maintains functional reset assertion even as VCC collapses.
Is the MAX6865UK29D2L+T pin-compatible with other devices in the MAX68xx family?
The MAX6865UK29D2L+T uses the standard 5-pin SOT23-5 package and shares identical pinout with MAX6864/MAX6866/MAX6867–MAX6869 variants: Pin 1 = RESET, Pin 2 = GND, Pin 3 = MR, Pin 4 = WDI, Pin 5 = VCC. However, it is not pin-compatible with MAX6861–MAX6863 (which use CT instead of WDI) or MAX6854–MAX6856 (which lack WDI). Always verify function mapping before substitution.
MAX6865UK29D2L+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:
- 40ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK29D2L+T FAQ
1.How can I place an order for MAX6865UK29D2L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK29D2L+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 MAX6865UK29D2L+T reliable?
The price and inventory of MAX6865UK29D2L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK29D2L+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK29D2L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK29D2L+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6865UK29D2L+T?
MAX6865UK29D2L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK29D2L+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 MAX6865UK29D2L+T?
For technical support, including MAX6865UK29D2L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK29D2L+T requirements.
6.How does Aetrix verify that MAX6865UK29D2L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK29D2L+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 MAX6865UK29D2L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK29D2L+T?
All MAX6865UK29D2L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK29D2L+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 MAX6865UK29D2L+T part is unused and in its original packaging.
Return procedure for MAX6865UK29D2L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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