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Analog Devices Inc./Maxim Integrated MAX6865UK26D5S+T
- Part No.:
- MAX6865UK26D5S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK26D5S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,724
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Product details
Overview
The MAX6865UK26D5S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, combining voltage monitoring, manual reset input (MR), and watchdog timer (WDI) functionality. It asserts an active-high push-pull RESET output when VCC drops below 2.625V (factory-trimmed threshold), MR is pulled low, or the watchdog expires after 209s (typ). Designed for ultra-low-power systems, it draws only 170nA (typ) supply current and guarantees valid reset operation down to VCC = +1.1V.
For engineers reviewing the MAX6865UK26D5S+T datasheet, MAX6865UK26D5S+T pinout, MAX6865UK26D5S+T application, or MAX6865UK26D5S+T equivalent, key selection criteria include its 2.625V reset threshold, 300ms minimum reset timeout (D5), 209s watchdog period (S suffix), active-high push-pull RESET output, and compatibility with battery-powered medical and portable electronics requiring guaranteed reset validity at low VCC.
Technical Context
This device implements a dual-monitoring architecture: a precision bandgap-based voltage detector triggers reset on VCC undervoltage, while a digital watchdog timer monitors WDI edge transitions to detect firmware lockup. The internal 10kΩ MR pullup enables direct switch interfacing without external components.
Reset assertion is latched and held for a fixed 300ms (min) timeout after VCC recovery, MR release, or watchdog expiration. Its BiCMOS process ensures immunity to short VCC transients (<40µs at 100mV overdrive) and stable operation across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.625V (factory-trimmed, ±2.5% tolerance); ensures reliable brownout detection for 2.7V–3.3V logic domains. |
| Supply Current | 170nA (typ) at +25°C; enables multi-year operation in coin-cell–powered devices like glucose monitors. |
| Reset Timeout Period | 300ms (min, D5 option); provides sufficient time for µP power stabilization and initialization before release. |
| Watchdog Timeout | 209s (typ, S suffix); supports long-cycle firmware tasks while detecting catastrophic hangs. |
| RESET Output Type | Active-high push-pull; eliminates need for external pullup and interfaces directly with µP reset inputs requiring high-active assertion. |
| Valid Reset Down to VCC | +1.1V; guarantees deterministic reset behavior during deep brownout, critical for data integrity in patient monitors. |
| Operating Temperature | –40°C to +85°C; qualified for industrial and medical portable equipment environments. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount. Compact footprint (2.9mm × 1.6mm) suitable for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output; drives µP reset pin directly-no external pullup required. |
| 2 | GND | Ground reference for all internal circuits; must be connected to system ground plane for noise immunity. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (10kΩ); accepts CMOS-level signals or momentary switch to GND. |
| 4 | WDI | Watchdog input; resets internal timer on any rising or falling edge; detects pulses ≥150ns wide. |
| 5 | VCC | Supply voltage input (1.2V–5.5V); monitored for undervoltage; requires 0.1µF bypass capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical enables >10-year battery life in single-CR2032–powered medical wearables. |
| Guaranteed reset validity to VCC = +1.1V | Ensures fail-safe reset assertion even during severe brownout, preventing undefined µP states. |
| No external components required | Integrated MR pullup, precision voltage reference, and watchdog oscillator eliminate BOM cost and layout area. |
| Immunity to short VCC transients | Rejects glitches ≤40µs at 100mV overdrive-critical for noisy DC-DC converter outputs. |
| Watchdog pulse detection | Recognizes edges as short as 150ns, allowing tight software timing margins without false timeouts. |
Applications
| Portable Glucose Monitors | Patient Vital Sign Loggers |
|---|---|
|
Use Scenario: Continuous glucose sensing with Bluetooth LE transmission powered by CR2032 battery. IC Role / Device Role / Timing Role: Supervises 3.0V rail, asserts RESET on brownout or firmware hang, and validates reset down to 1.1V during battery depletion. Use Value: Prevents corrupted sensor readings or failed BLE handshakes by ensuring µP always boots from known state-even with aging battery. |
Use Scenario: Wearable ECG patch recording heart rate and SpO₂ for 72-hour clinical trials. IC Role / Device Role / Timing Role: Monitors 2.8V LDO output; triggers 300ms reset hold and 209s watchdog to catch missed ADC interrupt servicing. Use Value: Eliminates silent data loss by forcing full µP reboot before corrupted waveform buffers overwrite valid clinical data. |
| Industrial Handheld Scanners | Smart Smoke Detectors |
|
Use Scenario: Rugged barcode scanner operating from rechargeable Li-ion with intermittent charging cycles. IC Role / Device Role / Timing Role: Detects VCC sag during motor-driven scan actuation; uses MR for user-initiated factory reset via side button. Use Value: Avoids partial boot failures that cause scanner freeze-ensuring consistent decode reliability in warehouse environments. |
Use Scenario: Battery-backed smoke alarm with self-test and wireless alert reporting. IC Role / Device Role / Timing Role: Supervises 3.3V backup rail; watchdog verifies annual self-test firmware execution completes within 209s. Use Value: Guarantees regulatory compliance by catching hung self-test routines before end-of-life battery discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK26D5S+T | Active-low push-pull RESET output; identical threshold, timeout, and watchdog specs. | Requires µP with active-low reset input; incompatible with active-high reset architectures without level-shifting. | Select when target µP reset pin is active-low and board layout cannot accommodate signal inversion. |
| TPS3837K26DBVR | 2.63V threshold, 200ms reset timeout, no watchdog; 1.6µA supply current (vs. 170nA). | Lacks watchdog functionality; higher ICC reduces battery life in multi-year deployments. | Choose only if watchdog is unnecessary and cost is prioritized over ultra-low power and feature completeness. |
Compared with MAX6864UK26D5S+T and TPS3837K26DBVR, the MAX6865UK26D5S+T uniquely delivers active-high RESET, nanopower operation, and integrated watchdog in one SOT23-5 package-enabling simpler, longer-life designs for safety-critical portable medical devices.
Availability
MAX6865UK26D5S+T is available at Aetrix Electronics and suitable for portable glucose monitors, patient vital sign loggers, industrial handheld scanners, and smart smoke detectors requiring stable component supply across extended production lifecycles.
Supply support for MAX6865UK26D5S+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 systems.
The MAX6854–MAX6869 family was engineered specifically for ultra-low-power microprocessor supervision in battery-critical portable medical and consumer electronics, emphasizing nanoscale current draw and robust reset assurance.
FAQ
What is the exact reset threshold voltage of the MAX6865UK26D5S+T?
The MAX6865UK26D5S+T has a factory-trimmed reset threshold voltage of 2.625V, with a guaranteed tolerance of ±2.5% over the full temperature range (–40°C to +85°C). This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "26" corresponds to 2.625V nominal. The MAX6865UK26D5S+T maintains this accuracy without external calibration.
Does the MAX6865UK26D5S+T require external components for basic operation?
No, the MAX6865UK26D5S+T operates autonomously with no external components required. It integrates a 10kΩ internal pullup on the MR pin, a precision voltage reference, and a self-contained watchdog oscillator. Only a 0.1µF ceramic bypass capacitor on VCC to GND is recommended for noise suppression-no resistors, capacitors, or additional ICs are needed for core supervision functionality in the MAX6865UK26D5S+T.
How does the watchdog timer in the MAX6865UK26D5S+T respond to firmware stalls?
The MAX6865UK26D5S+T watchdog timer expires if the WDI pin remains static (high or low) for longer than 209s (typical, S-suffix). Upon expiration, it asserts the active-high RESET output for 300ms (min, D5), forcing a full µP reboot. The timer clears on any WDI edge, MR assertion, or RESET assertion-ensuring rapid recovery from infinite loops or task starvation in safety-critical firmware running on the MAX6865UK26D5S+T.
Can the MAX6865UK26D5S+T guarantee reset assertion when VCC falls below 1.2V?
Yes, the MAX6865UK26D5S+T guarantees valid reset assertion down to VCC = +1.1V, as explicitly specified in the Electrical Characteristics table. Its push-pull active-high RESET output remains functional and well-defined even during deep brownout conditions-unlike open-drain or some competing supervisory ICs that lose drive capability below 1.5V. This ensures deterministic behavior in the MAX6865UK26D5S+T throughout the entire battery discharge curve.
What is the meaning of the "D5S" suffix in MAX6865UK26D5S+T?
In MAX6865UK26D5S+T, "D5" denotes the reset timeout period option: 300ms minimum (per Table 4), and "S" specifies the watchdog timeout variant: 209s typical (per Table 3). The "UK26" indicates the 2.625V reset threshold, "+T" confirms lead-free packaging, and the base "MAX6865" identifies it as a watchdog-enabled, active-high push-pull supervisory IC. All these codes are defined in the Ordering Information section of the MAX6865UK26D5S+T datasheet.
MAX6865UK26D5S+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
MAX6865UK26D5S+T FAQ
1.How can I place an order for MAX6865UK26D5S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK26D5S+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 MAX6865UK26D5S+T reliable?
The price and inventory of MAX6865UK26D5S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK26D5S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK26D5S+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK26D5S+T transactions.
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4.How is shipping managed for MAX6865UK26D5S+T?
MAX6865UK26D5S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK26D5S+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 MAX6865UK26D5S+T?
For technical support, including MAX6865UK26D5S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK26D5S+T requirements.
6.How does Aetrix verify that MAX6865UK26D5S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK26D5S+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 MAX6865UK26D5S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK26D5S+T?
All MAX6865UK26D5S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK26D5S+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 MAX6865UK26D5S+T part is unused and in its original packaging.
Return procedure for MAX6865UK26D5S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6865UK26D5S+T Tags
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