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Analog Devices Inc./Maxim Integrated MAX6865UK31D4L+T
- Part No.:
- MAX6865UK31D4L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK31D4L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,130
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Product details
Overview
MAX6865UK31D4L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring active-high push-pull RESET output, manual reset (MR) input, and watchdog timer with 209s typical timeout. It monitors VCC down to +1.1V, asserts reset when VCC drops below factory-trimmed 3.075V threshold (suffix "31"), and guarantees reset validity during brownout conditions in portable medical and battery-powered systems.
For engineers reviewing the MAX6865UK31D4L+T datasheet, MAX6865UK31D4L+T pinout, MAX6865UK31D4L+T application, or MAX6865UK31D4L+T equivalent, this page delivers verified functional identity, exact reset threshold and timeout values, watchdog timing behavior, MR interface logic, and real-world design implications for low-power embedded reset management.
Technical Context
The MAX6865UK31D4L+T implements a dual-trigger reset architecture: it asserts RESET on VCC falling below 3.075V (±2.5%), MR assertion, or WDI inactivity exceeding 209s (typ). Its internal watchdog clears on any WDI edge, MR assertion, or RESET assertion - ensuring robust recovery from software hangs without false triggers.
Reset deassertion follows a fixed 1200ms minimum timeout (suffix "D4") after VCC rises above threshold and MR deasserts; the active-high push-pull output drives high to VCC with VOH ≥ 0.8×VCC at 500µA source current, eliminating external pullups and supporting direct µP reset input interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 3.075V ±2.5% - factory-trimmed for precise brownout detection at nominal 3.3V rail |
| Reset Timeout Period | 1200ms min - ensures sufficient hold time for full µP initialization before release |
| Watchdog Timeout | 209s typ (L-suffix) - long-duration supervision suitable for infrequent firmware tasks |
| Supply Current | 170nA typ at +25°C - enables multi-year operation on coin-cell batteries |
| VCC Operating Range | 1.2V to 5.5V - supports wide-input voltage designs including 1.8V/2.5V/3.3V/5V systems |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup resistor and simplifies PCB layout |
| Guaranteed Reset Validity | Down to VCC = +1.1V - ensures deterministic reset state even 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 to VCC upon reset assertion; no external pullup required |
| 2 | GND | Ground reference - must be connected to system ground plane for stable reset timing and noise immunity |
| 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 - edge-sensitive; any rising or falling transition resets internal 209s timer; immune to <150ns glitches |
| 5 | VCC | Supply voltage input - monitored for reset generation; requires 0.1µF bypass capacitor to GND for noise rejection |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical - extends battery life in glucose monitors and wearable health devices |
| Immunity to short VCC transients | Rejects ≤40µs transients at 100mV overdrive - prevents spurious resets in noisy power environments |
| No external components required | Integrated MR pullup, precision voltage reference, and watchdog oscillator - reduces BOM count and board area |
| Guaranteed reset validity to 1.1V | Ensures reliable reset assertion even as battery discharges below 1.2V - critical for safety-critical medical use |
| Watchdog edge-triggered clear | WDI transitions (rising/falling) fully reset timer - enables flexible firmware heartbeat placement without strict periodicity |
Applications
| Portable Glucose Monitors | Patient Vital Sign Loggers |
|---|---|
Use Scenario: Battery-powered handheld device measuring blood glucose levels with Bluetooth LE transmission. IC Role / Device Role / Timing Role: Supervises 3.3V main rail and initiates full µP reset on brownout or firmware hang via WDI monitoring. Use Value: 170nA quiescent current enables >5-year shelf life on CR2032; 209s watchdog timeout accommodates extended sleep cycles between measurements. |
Use Scenario: Wearable patch recording ECG, SpO₂, and temperature over 72-hour clinical sessions. IC Role / Device Role / Timing Role: Provides fail-safe reset during intermittent charging events and ensures µP restarts cleanly after low-battery shutdown. Use Value: Reset valid to 1.1V prevents undefined µP state during final battery discharge; 1200ms timeout allows complete sensor initialization sequence. |
| Industrial Handheld Scanners | Smart Smoke Detectors |
Use Scenario: Rugged barcode scanner with cold-temperature operation (-20°C) and frequent wake/sleep cycling. IC Role / Device Role / Timing Role: Monitors 1.8V logic rail and asserts active-high RESET to ARM Cortex-M0+ on power-up instability or code lockup. Use Value: Push-pull output eliminates pullup resistor, reducing component count; 3.075V threshold matches 3.3V LDO tolerance stack-up. |
Use Scenario: UL-certified battery-operated smoke alarm with 10-year sealed lithium cell and self-test routines. IC Role / Device Role / Timing Role: Acts as primary safety monitor - triggers hardware reset if µP fails to toggle WDI during monthly self-test. Use Value: 209s watchdog period aligns with self-test execution window; 170nA ICC minimizes annual battery drain to <0.5%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK31D4L+T | Active-low push-pull RESET output instead of active-high; identical threshold, timeout, and watchdog specs | Requires µP with active-low reset input; incompatible with active-high-only reset pins without level-shifting | Select when target µP uses active-low reset signaling and board layout already accommodates pullup-free drive |
| TPS3837K33DBVR | 3.3V fixed threshold (not 3.075V); 200ms reset timeout (not 1200ms); no watchdog timer; SOT23-5 pinout | Suitable only for basic power-on reset without runtime supervision; lacks WDI-based fault recovery capability | Choose only for cost-sensitive, non-safety-critical applications where watchdog functionality is omitted by system design |
Compared with MAX6864UK31D4L+T and TPS3837K33DBVR, the MAX6865UK31D4L+T uniquely combines long watchdog supervision (209s), extended reset hold (1200ms), and active-high push-pull output - making it optimal for battery-constrained medical and industrial devices requiring both power-on reliability and runtime fault detection.
Availability
MAX6865UK31D4L+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered instrumentation, and industrial handheld equipment requiring stable component supply across extended product lifecycles.
Supply support for MAX6865UK31D4L+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 MAX68xx family delivers nanopower supervisory circuits optimized for ultra-low-energy battery applications where reset integrity, watchdog supervision, and minimal quiescent current are mandatory.
FAQ
What is the exact reset threshold voltage for MAX6865UK31D4L+T?
The MAX6865UK31D4L+T has a factory-trimmed reset threshold of 3.075V with ±2.5% tolerance (minimum 2.998V, maximum 3.152V), corresponding to the "31" suffix in its part number per Maxim's Threshold Suffix Guide. This value is guaranteed over -40°C to +85°C and enables precise brownout detection on 3.3V rails with margin for LDO dropout and load regulation.
Does MAX6865UK31D4L+T support active-high reset output?
Yes, MAX6865UK31D4L+T features an active-high push-pull RESET output - meaning it drives high to VCC when asserting reset and returns low when deasserted. This eliminates the need for an external pullup resistor and directly interfaces with µPs that require active-high reset signaling, unlike open-drain or active-low variants in the same family.
What is the watchdog timeout period for MAX6865UK31D4L+T?
The MAX6865UK31D4L+T uses the "L" suffix, specifying a typical watchdog timeout of 209 seconds (min 95s, max 487s). The internal timer resets on any WDI edge (rising or falling), MR assertion, or RESET assertion - enabling flexible firmware heartbeat placement without strict periodic timing constraints.
How long does the reset signal remain asserted after power recovery?
The MAX6865UK31D4L+T holds RESET asserted for a minimum of 1200ms after VCC rises above the 3.075V threshold and MR is deasserted, per the "D4" timeout suffix. This guaranteed minimum duration ensures complete µP initialization, clock stabilization, and peripheral readiness before release - critical for reliable boot in resource-constrained systems.
Can MAX6865UK31D4L+T operate down to 1.2V supply?
Yes, MAX6865UK31D4L+T operates across VCC = 1.2V to 5.5V and guarantees valid RESET assertion down to VCC = 1.1V. At 1.2V, it draws only ~190nA typical supply current and maintains full watchdog and MR functionality - making it suitable for end-of-battery-life operation in coin-cell-powered medical devices.
MAX6865UK31D4L+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:
- 3.075V
- 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
MAX6865UK31D4L+T FAQ
1.How can I place an order for MAX6865UK31D4L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK31D4L+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 MAX6865UK31D4L+T reliable?
The price and inventory of MAX6865UK31D4L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK31D4L+T is usually 5 days.
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Once your MAX6865UK31D4L+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 MAX6865UK31D4L+T?
For technical support, including MAX6865UK31D4L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK31D4L+T requirements.
6.How does Aetrix verify that MAX6865UK31D4L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK31D4L+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 MAX6865UK31D4L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK31D4L+T?
All MAX6865UK31D4L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK31D4L+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 MAX6865UK31D4L+T part is unused and in its original packaging.
Return procedure for MAX6865UK31D4L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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