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Analog Devices Inc./Maxim Integrated MAX6865UK26D1L+T
- Part No.:
- MAX6865UK26D1L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK26D1L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,192
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Product details
Overview
MAX6865UK26D1L+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 D1L), 10ms minimum reset timeout, manual reset input (MR), and watchdog timer with 209s typical timeout. It monitors VCC in battery-powered portable electronics to ensure reliable µP reset during brownout or software hang.
For engineers reviewing the MAX6865UK26D1L+T datasheet, MAX6865UK26D1L+T pinout, MAX6865UK26D1L+T application, or MAX6865UK26D1L+T equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options for low-power embedded system design.
Technical Context
The MAX6865UK26D1L+T integrates voltage monitoring, manual reset assertion, and watchdog timer functionality in a single BiCMOS IC. Its reset output remains asserted for ≥10ms after VCC rises above 2.625V and MR deasserts, and it triggers reset if WDI remains static beyond 209s (typ).
It features active-high push-pull RESET output, internal 10kΩ MR pullup, guaranteed reset validity down to VCC = +1.1V, and immunity to VCC transients ≤40µs at 100mV overdrive - enabling robust operation in noisy, low-voltage portable systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.625V (factory-trimmed, ±2.5% tolerance) - ensures precise brownout detection for 2.7–3.3V logic rails. |
| Supply Current | 170nA (typ) at +25°C - enables multi-year battery life in glucose monitors and wearables. |
| Reset Timeout | 10ms (min) - provides sufficient hold time for µP power-up initialization without delaying system boot. |
| Watchdog Timeout | 209s (typ, L-suffix) - supports long-cycle firmware tasks while catching catastrophic hangs. |
| VCC Operating Range | 1.2V to 5.5V - compatible with Li-ion, coin-cell, and multi-rail embedded supplies. |
| Reset Output Type | Active-high push-pull - eliminates external pullup, simplifies interface to µP reset inputs requiring high-active assertion. |
| Guaranteed Reset Validity | Down to VCC = +1.1V - ensures deterministic reset behavior during deep brownout recovery. |
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 - asserts high during fault conditions (VCC < 2.625V, MR low, or WDI timeout); sinks/source capability defined per VCC level. |
| 2 | GND | Ground reference - must be connected to system common ground; shared return for all internal circuits. |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; logic-low pulse ≥1µs initiates reset sequence. |
| 4 | WDI | Watchdog input - edge-sensitive (rising/falling); clears internal timer on transition; timeout occurs if static >209s (typ). |
| 5 | VCC | Supply and monitored voltage input - powers device and serves as reset monitor rail; requires 0.1µF bypass capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in coin-cell-powered medical devices. |
| Watchdog immunity to noise | 150ns minimum WDI pulse width tolerance prevents false timeouts from EMI or signal jitter. |
| Reset assertion at low VCC | Guaranteed RESET validity down to VCC = +1.1V ensures fail-safe behavior during undervoltage recovery. |
| No external components | Integrated MR pullup, precision voltage reference, and timing elements eliminate BOM cost and layout area. |
| Transient immunity | Immune to VCC glitches ≤40µs at 100mV overdrive - avoids spurious resets in electrically noisy environments. |
Applications
| Portable Glucose Monitor | Patient Vital Sign Logger |
|---|---|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high RESET to ARM Cortex-M0+ MCU during battery voltage sag or firmware lockup. Use Value: 170nA quiescent current extends battery life beyond 24 months; 209s watchdog timeout accommodates long sensor calibration cycles without false reset. |
Use Scenario: Wearable ECG/SpO₂ patch recording data every 5 minutes and storing locally before nightly upload. IC Role / Device Role / Timing Role: Voltage monitor and watchdog enforcing safe boot and runtime recovery of ultra-low-power microcontroller. Use Value: 2.625V reset threshold aligns with end-of-life cutoff for 3V lithium primary cells; 10ms reset pulse satisfies ARM reset timing requirements. |
| Industrial Handheld Scanner | Smart Smoke Detector |
Use Scenario: Rugged barcode scanner using AA batteries and operating in variable-temperature warehouses. IC Role / Device Role / Timing Role: Brownout protector and software watchdog for TI MSP430-based host controller managing laser, imager, and BLE. Use Value: Guaranteed reset operation from -40°C to +85°C and immunity to 40µs VCC transients prevent field failures during motor-induced supply noise. |
Use Scenario: Battery-backed photoelectric smoke alarm with 10-year sealed lithium battery and self-test routine. IC Role / Device Role / Timing Role: Primary supervisor ensuring MCU reset on battery depletion, temperature drift, or firmware stall during monthly self-test. Use Value: Factory-trimmed 2.625V threshold matches lithium battery discharge curve; 209s watchdog enforces full self-test completion before reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK26D1L+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 pin without level-shifting. | Select when target MCU uses active-low reset assertion and board layout cannot accommodate inversion. |
| TPS3837K26DBVR | 1.8V–5.5V VCC range; 2.63V threshold; 10ms timeout; no integrated watchdog; 2.5µA ICC (typ). | Lacks watchdog functionality; higher supply current reduces battery lifetime in always-on devices. | Choose only if watchdog is unnecessary and cost is prioritized over power efficiency and safety coverage. |
Compared with MAX6865UK26D1L+T, MAX6864UK26D1L+T offers identical supervision accuracy and watchdog timing but differs in reset polarity - critical for direct µP interface compatibility; TPS3837K26DBVR omits watchdog entirely and draws 15× more current, limiting suitability to non-critical, line-powered applications.
Availability
MAX6865UK26D1L+T is available at Aetrix Electronics and suitable for portable medical devices, industrial handheld scanners, smart smoke detectors, and battery-powered IoT sensors requiring stable component supply across extended product lifecycles.
Supply support for MAX6865UK26D1L+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 and medical applications.
The MAX6854–MAX6869 family delivers nanopower supervisory functionality targeting battery-critical portable electronics - emphasizing ultra-low ICC, wide VCC range, and integrated watchdog for functional safety in resource-constrained systems.
FAQ
What is the exact reset threshold voltage of MAX6865UK26D1L+T?
The MAX6865UK26D1L+T has a factory-trimmed reset threshold of 2.625V, 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 '26' corresponds to 2.625V nominal. The device asserts RESET high when VCC falls below this threshold and holds it for ≥10ms after VCC recovers.
Does MAX6865UK26D1L+T include a watchdog timer, and what is its timeout?
Yes, MAX6865UK26D1L+T includes a watchdog timer with 209s typical timeout (L-suffix). The timer expires if the WDI pin remains static (no rising or falling edge) beyond this period, triggering a reset for the 10ms timeout duration. The timer clears on any WDI transition, MR assertion, or RESET assertion - ensuring responsive fault recovery in MAX6865UK26D1L+T deployments.
What is the function of Pin 1 on MAX6865UK26D1L+T?
Pin 1 of MAX6865UK26D1L+T is the RESET output, configured as active-high push-pull. It drives high during reset conditions - including VCC drop below 2.625V, MR low, or WDI timeout - and returns low after the 10ms timeout expires. Unlike open-drain variants, it requires no external pullup and interfaces directly to µP reset pins expecting high-active assertion.
What is the supply current specification for MAX6865UK26D1L+T at room temperature?
The MAX6865UK26D1L+T draws 170nA typical supply current at +25°C and VCC = 2.5V, as specified in the Electrical Characteristics table. This ultra-low ICC is measured with reset deasserted and no load on RESET. At VCC = 1.8V, it remains 170nA (typ), confirming consistent nanopower performance across its 1.2V–5.5V operating range - a key enabler for MAX6865UK26D1L+T in decade-long battery applications.
Is MAX6865UK26D1L+T compatible with 1.8V microcontrollers?
Yes, MAX6865UK26D1L+T operates from VCC = 1.2V to 5.5V and guarantees RESET validity down to VCC = +1.1V. Its 2.625V reset threshold is appropriate for monitoring 3.3V or 2.8V rails, but when used with 1.8V µPs, it must supervise the µP's actual VCC supply - not a lower I/O voltage. The active-high push-pull RESET output is fully compatible with 1.8V logic thresholds, as VOH ≥ 0.8×VCC and VOL ≤ 0.3V across the range.
MAX6865UK26D1L+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:
- 10ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK26D1L+T FAQ
1.How can I place an order for MAX6865UK26D1L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK26D1L+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 MAX6865UK26D1L+T reliable?
The price and inventory of MAX6865UK26D1L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK26D1L+T is usually 5 days.
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MAX6865UK26D1L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK26D1L+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 MAX6865UK26D1L+T?
For technical support, including MAX6865UK26D1L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK26D1L+T requirements.
6.How does Aetrix verify that MAX6865UK26D1L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK26D1L+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 MAX6865UK26D1L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK26D1L+T?
All MAX6865UK26D1L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK26D1L+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 MAX6865UK26D1L+T part is unused and in its original packaging.
Return procedure for MAX6865UK26D1L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6865UK26D1L+T Tags
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MIC826SYMT-TR
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