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Analog Devices Inc./Maxim Integrated MAX6865UK41D2L+T
- Part No.:
- MAX6865UK41D2L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK41D2L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,050
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Product details
Overview
MAX6865UK41D2L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 4.100V reset threshold (±2.5%), 40ms minimum reset timeout, manual reset input (MR), and watchdog timer with 209s typical timeout. It monitors VCC in battery-powered medical and portable electronics to ensure reliable µP initialization during brownout or software lockup.
For engineers reviewing the MAX6865UK41D2L+T datasheet, MAX6865UK41D2L+T pinout, MAX6865UK41D2L+T application, or MAX6865UK41D2L+T equivalent, this device delivers validated reset assertion down to VCC = +1.1V, immunity to sub-40µs VCC transients, and guaranteed push-pull active-low RESET output compatibility with 1.2V–5.5V supply rails.
Technical Context
The MAX6865UK41D2L+T integrates a precision voltage monitor, a glitch-immune manual reset detector with 250ns MR-to-reset delay and 1µs minimum pulse width, and a watchdog timer that clears on any WDI edge and expires if WDI remains static beyond 209s (typ). Its internal 10kΩ MR pullup eliminates external components.
Reset assertion occurs when VCC falls below 4.100V, MR is pulled low, or the watchdog times out; RESET remains asserted for ≥40ms after VCC rises above threshold and MR deasserts. The device operates across -40°C to +85°C with guaranteed functionality at VCC as low as 1.2V.
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 | 4.100V ±2.5% - factory-trimmed for precise 3.3V/5V rail monitoring without external resistors |
| Reset Timeout Period | 40ms min (D2 option) - ensures µP completes power-up sequencing before release |
| Watchdog Timeout | 209s typ (L suffix) - supports long-loop firmware without false triggers |
| VCC Operating Range | 1.2V to 5.5V - compatible with Li-ion, alkaline, and regulated 1.8V/2.5V/3.3V/5V systems |
| RESET Output Type | Push-pull active-low - drives µP reset pin directly without pullup resistor |
| Guaranteed Reset Validity | To VCC = +1.1V - maintains valid logic state during deep brownout |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, footprint-compatible with industry-standard 5-pin supervisory ICs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output - asserts low during fault conditions and holds for ≥40ms post-recovery |
| 2 | GND | Ground reference - must be connected to system ground plane for noise immunity and accurate threshold sensing |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; accepts CMOS logic or momentary switch to GND |
| 4 | WDI | Watchdog input - edge-sensitive; clears internal timer on rising/falling transitions; requires toggling every <209s |
| 5 | VCC | Supply and monitored voltage input - powers device and provides reference for reset threshold detection |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in glucose monitors and wearables |
| Reset threshold accuracy | ±2.5% over -40°C to +85°C ensures reliable trip point across temperature without calibration |
| VCC transient immunity | Immune to ≤40µs VCC glitches at 100mV overdrive - prevents spurious resets in noisy automotive/industrial environments |
| No external components | Integrated MR pullup, precision voltage reference, and watchdog oscillator eliminate BOM cost and layout area |
| Valid RESET at low VCC | Guaranteed RESET functionality down to VCC = +1.1V - supports graceful shutdown in deep brownout scenarios |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission and low-power sleep cycles. IC Role / Device Role / Timing Role: Supervisory circuit asserting reset during battery voltage sag or firmware hang to recover sensor stack. Use Value: Prevents missed readings or corrupted data logs by ensuring µP restarts reliably after brownout or watchdog timeout. |
Use Scenario: Portable ECG and SpO₂ units operating on single AA/AAA cells with intermittent wireless upload. IC Role / Device Role / Timing Role: Voltage monitor and watchdog enforcing safe boot sequence and detecting unresponsive firmware loops. Use Value: Maintains clinical-grade reliability with 170nA quiescent current extending battery life beyond 6 months per set. |
| Industrial Handheld Terminals | Smart Asset Trackers |
Use Scenario: Ruggedized barcode scanners and RFID readers deployed in warehouses with variable ambient temperature. IC Role / Device Role / Timing Role: Brownout protector and manual reset enabler for field technicians performing cold reboots. Use Value: Ensures deterministic startup under 1.8V–3.6V battery discharge curves and rejects ESD-induced VCC transients. |
Use Scenario: GPS-enabled logistics tags reporting location every 12 hours using Li-SOCl₂ primary cells. IC Role / Device Role / Timing Role: Long-interval watchdog supervisor preventing firmware freeze during extended sleep modes. Use Value: 209s watchdog timeout aligns with typical wake intervals, eliminating unnecessary resets while catching true lockups. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3836K33DBVR | Fixed 3.08V reset threshold; no watchdog; 200ms reset timeout; 1.6µA ICC | Lacks watchdog capability and ultra-low current - suitable only for basic reset-only designs | Select when watchdog is unnecessary and higher ICC is acceptable for cost-sensitive industrial controls |
| STM6315SW13F | 3.08V threshold; 140ms timeout; 1.2µA ICC; no MR or watchdog; open-drain RESET | Higher current, no manual reset or watchdog - limited to simple power-on reset in legacy systems | Choose for drop-in replacement in existing STM63xx-based designs where feature reduction is acceptable |
Compared with TPS3836K33DBVR and STM6315SW13F, the MAX6865UK41D2L+T uniquely combines nanopower operation, precise 4.100V threshold, integrated watchdog with 209s timeout, and manual reset - making it optimal for next-generation battery-critical medical and IoT endpoints requiring full supervision.
Availability
MAX6865UK41D2L+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered instrumentation, and industrial handheld terminals requiring stable component supply across extended product lifecycles.
Supply support for MAX6865UK41D2L+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for demanding applications.
The MAX68xx family was designed specifically for ultra-low-power microprocessor supervision in space-constrained, battery-operated systems - delivering precision voltage monitoring, robust reset timing, and intelligent watchdog protection in minimal footprint.
FAQ
What is the exact reset threshold voltage of the MAX6865UK41D2L+T?
The MAX6865UK41D2L+T has a factory-trimmed reset threshold voltage of 4.100V with ±2.5% tolerance over -40°C to +85°C. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "41" corresponds to 4.100V nominal. The device guarantees valid reset assertion down to VCC = +1.1V, supporting operation across wide supply ranges.
Does the MAX6865UK41D2L+T include a watchdog timer, and what is its timeout period?
Yes, the MAX6865UK41D2L+T includes a watchdog timer with a typical timeout period of 209 seconds, indicated by the "L" suffix in the part number. The timer clears on any rising or falling edge at the WDI pin and expires only if WDI remains static beyond this interval. This long timeout is optimized for firmware with extended idle periods, such as in asset trackers or metering devices.
What type of RESET output does the MAX6865UK41D2L+T provide, and how is it configured?
The MAX6865UK41D2L+T provides a push-pull active-low RESET output (pin 1), which actively drives low during reset and high when deasserted - requiring no external pullup resistor. This configuration is fixed per the "65" variant designation and differs from open-drain or active-high variants in the MAX68xx family. It interfaces directly with standard µP reset inputs powered from 1.2V–5.5V rails.
What is the minimum reset timeout period for the MAX6865UK41D2L+T, and how is it selected?
The MAX6865UK41D2L+T has a fixed minimum reset timeout period of 40ms, denoted by the "D2" suffix in the part number. This value is one of six factory-programmed options (D1–D6) ranging from 10ms to 1200ms. Unlike the MAX6861–MAX6863 series, the MAX6865 does not support pin-selectable timeout - D2 is permanently configured during manufacturing.
How does the MAX6865UK41D2L+T handle short VCC transients, and what is its immunity level?
The MAX6865UK41D2L+T is immune to VCC transients ≤40µs in duration when the overdrive is 100mV above the 4.100V threshold, as shown in the "Maximum VCC Transient Duration vs. Reset Threshold Overdrive" graph. This immunity prevents false resets caused by switching noise or ESD events, making it suitable for use in electrically noisy environments like industrial handhelds or medical equipment with motorized components.
MAX6865UK41D2L+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:
- 4.1V
- 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
MAX6865UK41D2L+T FAQ
1.How can I place an order for MAX6865UK41D2L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK41D2L+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 MAX6865UK41D2L+T reliable?
The price and inventory of MAX6865UK41D2L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK41D2L+T is usually 5 days.
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Once your MAX6865UK41D2L+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 MAX6865UK41D2L+T?
For technical support, including MAX6865UK41D2L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK41D2L+T requirements.
6.How does Aetrix verify that MAX6865UK41D2L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK41D2L+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 MAX6865UK41D2L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK41D2L+T?
All MAX6865UK41D2L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK41D2L+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 MAX6865UK41D2L+T part is unused and in its original packaging.
Return procedure for MAX6865UK41D2L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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