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Analog Devices Inc./Maxim Integrated MAX6865UK26D5L+T
- Part No.:
- MAX6865UK26D5L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK26D5L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,063
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Product details
Overview
The MAX6865UK26D5L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 2.625V reset threshold (suffix "26"), 600ms minimum reset timeout (suffix "D5"), and watchdog timer with 209s typical timeout (suffix "L"). It monitors VCC, responds to manual reset (MR), and triggers reset on watchdog expiration - designed for battery-powered medical and portable electronics requiring guaranteed reset validity down to VCC = +1.1V.
For engineers reviewing the MAX6865UK26D5L+T datasheet, MAX6865UK26D5L+T pinout, MAX6865UK26D5L+T application, or MAX6865UK26D5L+T equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior, and validated alternative options for low-power µP supervision in glucose monitors, wearables, and handheld diagnostics.
Technical Context
The MAX6865UK26D5L+T integrates a precision voltage monitor with ±2.5% threshold accuracy over -40°C to +85°C, a 209s typical watchdog timer cleared by WDI edges, and a 600ms minimum reset timeout after VCC recovery or MR release. Its internal 10kΩ MR pullup and glitch rejection (200ns) enable robust manual reset without external components.
This device uses BiCMOS process technology (2848 transistors) and guarantees valid reset output down to VCC = +1.1V. The active-high push-pull RESET output is referenced to VCC, eliminating need for external pullup while supporting direct interface to µP reset inputs across 1.2V–5.5V supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at +25°C - enables multi-year operation on coin-cell batteries in always-on monitoring devices. |
| Reset Threshold | 2.625V (±2.5%) - factory-trimmed to supervise 2.6V logic rails or Li-ion battery mid-discharge voltage. |
| Reset Timeout | 600ms minimum (D5 option) - ensures µP completes power-up initialization before release from reset. |
| Watchdog Timeout | 209s typical (L option) - provides long-duration software execution monitoring for infrequent but critical tasks. |
| VCC Range | 1.2V to 5.5V - supports operation across single-cell Li-ion, 3.3V, and 5V systems without level-shifting. |
| RESET Output Type | Active-high push-pull - drives µP reset pin directly without external resistor; VOH ≥ 0.8×VCC at 500µA source. |
| Guaranteed Reset Validity | Down to VCC = +1.1V - maintains deterministic reset state during deep brownout, preventing undefined µP behavior. |
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 - asserts high during fault conditions (VCC < 2.625V, MR low, or WDI timeout); deasserts low after timeout expires. |
| 2 | GND | Ground reference - must be connected to system ground plane; shared return for all internal circuits. |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; 1µs minimum pulse width; 200ns glitch rejection. |
| 4 | WDI | Watchdog input - edge-sensitive (rising/falling); clears internal timer on each transition; timeout triggered if static >209s. |
| 5 | VCC | Supply voltage input - monitored for reset assertion; bypass with 0.1µF capacitor to GND for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current - extends battery life in portable medical devices beyond 5 years on CR2032. |
| Reset threshold accuracy | ±2.5% over -40°C to +85°C - eliminates need for external calibration in field-deployed patient monitors. |
| Watchdog immunity | 150ns minimum WDI pulse width - rejects EMI-induced glitches while detecting true software hangs. |
| VCC transient immunity | Immune to ≤40µs 100mV VCC transients - prevents spurious resets in electrically noisy environments like hospital equipment. |
| No external components | Integrated MR pullup, precision bandgap, and RC timing - reduces BOM count and PCB area in space-constrained wearables. |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Loggers |
|---|---|
|
Use Scenario: Continuous glucose monitoring (CGM) patch worn for 10+ days, powered by microbattery. IC Role / Device Role / Timing Role: Supervises 2.6V analog front-end and BLE SoC; asserts reset on battery sag below 2.625V or firmware hang detected via WDI. Use Value: Prevents corrupted glucose readings during brownout; 209s watchdog timeout aligns with sensor calibration interval, ensuring data integrity without excessive power drain. |
Use Scenario: Portable ECG/SpO₂ logger used in home care, operating 72h on single AAA cell. IC Role / Device Role / Timing Role: Monitors main 3.0V rail; triggers reset if µP fails to toggle WDI during sleep/wake cycles or if MR pressed for emergency reboot. Use Value: 600ms reset timeout allows full ADC initialization and flash memory verification before clinical data capture begins. |
| Handheld Diagnostic Scanners | Wearable Health Trackers |
|
Use Scenario: Battery-powered infrared thermometer or dermal scanner with intermittent usage pattern. IC Role / Device Role / Timing Role: Provides power-on reset and brownout protection; MR pin enables hardware reset button; WDI monitors firmware heartbeat during measurement sequences. Use Value: 170nA quiescent current preserves >95% of battery capacity during standby; 2.625V threshold matches nominal LiPo discharge curve midpoint. |
Use Scenario: Fitness tracker with optical heart-rate sensor, running continuous low-power firmware. IC Role / Device Role / Timing Role: Supervises 1.8V sensor hub supply; RESET output drives µP reset pin directly; WDI toggled every 200ms by firmware scheduler. Use Value: Active-high push-pull RESET eliminates external pullup, saving board space and leakage path; guaranteed reset validity to 1.1V prevents boot failure during cold-weather operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK26D5L+T | Active-low push-pull RESET output; identical VTH, tRP, tWD, and pinout except RESET polarity. | Requires µP with active-low reset input; no change to MR, WDI, or power sequencing logic. | Select when interfacing with legacy µPs that mandate active-low reset assertion. |
| TPS3836K33DBVR | Fixed 3.08V reset threshold; no watchdog timer; 200ms reset timeout; 3.5µA supply current. | Lacks WDI functionality and ultra-low power; suited only for basic reset supervision without software monitoring. | Choose only if watchdog capability is unnecessary and higher supply current is acceptable for cost-sensitive designs. |
Compared with MAX6865UK26D5L+T, MAX6864UK26D5L+T offers identical supervision timing and power efficiency but inverted RESET polarity, while TPS3836K33DBVR trades nanopower operation and watchdog functionality for lower unit cost and simpler integration in non-critical applications.
Availability
MAX6865UK26D5L+T is available at Aetrix Electronics and suitable for glucose monitors, patient loggers, and wearable health trackers requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6865UK26D5L+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 interface applications in industrial, medical, and communications markets.
The MAX6854–MAX6869 family delivers nanopower µP supervision with integrated watchdog and manual reset for battery-critical portable medical and diagnostic equipment where reliability and multi-year operation are mandatory.
FAQ
What is the exact reset threshold voltage of the MAX6865UK26D5L+T?
The MAX6865UK26D5L+T has a factory-trimmed reset threshold of 2.625V, with ±2.5% tolerance over the full -40°C to +85°C operating temperature range. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "26" corresponds to 2.625V nominal. The MAX6865UK26D5L+T guarantees reset assertion when VCC falls below this threshold and holds reset for the full 600ms timeout after recovery.
Does the MAX6865UK26D5L+T include a watchdog timer, and what is its timeout period?
Yes, the MAX6865UK26D5L+T includes a watchdog timer with a typical timeout period of 209s, indicated by the "L" suffix in the part number. The timer resets on any rising or falling edge at the WDI pin and triggers reset if WDI remains static longer than this period. This long timeout is specifically designed for applications where firmware executes infrequent but critical tasks, such as periodic sensor calibration in medical devices.
What type of RESET output does the MAX6865UK26D5L+T provide, and how is it configured?
The MAX6865UK26D5L+T provides an active-high push-pull RESET output, as confirmed in the MAX6865 pin description and Selector Guide. Pin 1 drives high during reset assertion (VCC < 2.625V, MR low, or WDI timeout) and pulls low after the 600ms timeout expires. This eliminates the need for an external pullup resistor and ensures clean, rail-to-rail reset signaling directly compatible with µPs requiring active-high reset inputs.
What is the supply current of the MAX6865UK26D5L+T, and under what conditions is it measured?
The MAX6865UK26D5L+T draws 170nA typical supply current at +25°C with VCC = 2.5V and no load on RESET, as specified in the Electrical Characteristics table. This ultra-low quiescent current is maintained across the full 1.2V–5.5V VCC range and over temperature, enabling multi-year battery life in always-on portable medical devices - a key design target for the MAX6865UK26D5L+T.
How does the MAX6865UK26D5L+T handle short VCC transients, and what is its immunity level?
The MAX6865UK26D5L+T is immune to short VCC transients up to 40µs duration when the overdrive is 100mV, as shown in the "Maximum VCC Transient Duration vs. Reset Threshold Overdrive" graph. This transient immunity prevents spurious resets caused by switching noise or coupling in compact, battery-powered systems - a critical feature validated for use in ECG loggers and glucose monitors where signal integrity must be preserved.
MAX6865UK26D5L+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:
- 2.625V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 300ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK26D5L+T FAQ
1.How can I place an order for MAX6865UK26D5L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK26D5L+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 MAX6865UK26D5L+T reliable?
The price and inventory of MAX6865UK26D5L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK26D5L+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK26D5L+T?
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4.How is shipping managed for MAX6865UK26D5L+T?
MAX6865UK26D5L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK26D5L+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 MAX6865UK26D5L+T?
For technical support, including MAX6865UK26D5L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK26D5L+T requirements.
6.How does Aetrix verify that MAX6865UK26D5L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK26D5L+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 MAX6865UK26D5L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK26D5L+T?
All MAX6865UK26D5L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK26D5L+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 MAX6865UK26D5L+T part is unused and in its original packaging.
Return procedure for MAX6865UK26D5L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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