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Analog Devices Inc./Maxim Integrated MAX6866UK26D3L+T
- Part No.:
- MAX6866UK26D3L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6866UK26D3L+T.pdf
- Description:
- IC MPU SUPERVISOR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:7,200
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Product details
Overview
The MAX6866UK26D3L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 2.625V reset threshold (suffix "26"), 150ms minimum reset timeout (suffix "D3"), and watchdog timer with 209s typical timeout (suffix "L"). It monitors VCC, responds to manual reset (MR), and triggers reset on watchdog timeout or brownout - used in battery-powered medical and portable electronics requiring guaranteed reset assertion down to VCC = +1.1V.
For engineers reviewing the MAX6866UK26D3L+T datasheet, MAX6866UK26D3L+T pinout, MAX6866UK26D3L+T application, or MAX6866UK26D3L+T equivalent, this page delivers verified functional identity, exact reset threshold and timeout values, watchdog timing behavior, SOT23-5 terminal mapping, and real-world selection guidance for low-power µP supervision in glucose monitors, patient monitors, and handheld devices.
Technical Context
The MAX6866UK26D3L+T integrates voltage monitoring, manual reset input (MR), and watchdog timer (WDI) in a single BiCMOS IC. Its reset output asserts low when VCC drops below 2.625V ±2.5%, MR is pulled low, or WDI remains static beyond 209s (typ). The internal timer holds reset asserted for ≥150ms after recovery.
It uses a precision bandgap reference and hysteresis (0.5% of VTH) to reject short VCC transients (e.g., ≤40µs at 100mV overdrive). The watchdog clears on any WDI edge and resumes counting only after reset deasserts - ensuring reliable detection of software hangs without false triggers during reset assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.625V ±2.5% - precisely trimmed to monitor 2.6V–2.7V rails; ensures deterministic reset during brownout in 2.8V/3.0V systems. |
| Supply Current | 170nA (typ) at +25°C - enables multi-year operation on coin cells in portable medical devices. |
| Reset Timeout | 150ms (min) - guarantees µP initialization completes before release; avoids premature boot in slow-ramping power supplies. |
| Watchdog Timeout | 209s (typ), L-suffix - supports long-loop firmware (e.g., sensor polling intervals) while detecting catastrophic hangs. |
| VCC Validity Range | Operates down to VCC = +1.1V - maintains valid reset assertion even during deep brownout, critical for fail-safe shutdown. |
| Output Type | Open-drain active-low RESET - allows level-shifting to diverse logic families (0–5.5V pullup) and wired-OR reset bus configurations. |
| MR Input | Active-low with 10kΩ internal pullup - simplifies manual reset implementation using momentary switch to GND; no external components needed. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount. Compact 2.9mm × 1.6mm footprint optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Open-drain active-low reset output; requires external pullup; sinks ≥500µA at VCC ≥2.38V (VOL ≤0.3V). |
| 2 | GND | Ground reference for all internal circuits; must connect to system ground plane with low-impedance path. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (10kΩ); accepts CMOS levels; glitch rejection ≥200ns. |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); clears internal timer on each transition; pulse width ≥150ns guaranteed. |
| 5 | VCC | Supply input and monitored rail; bypass with 0.1µF ceramic capacitor to GND for noise immunity; valid from 1.2V to 5.5V. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in coin-cell-powered glucose monitors. |
| Reset threshold accuracy | ±2.5% tolerance over -40°C to +85°C ensures reliable brownout detection across industrial temperature range. |
| Watchdog immunity to reset state | WDI timer pauses during RESET assertion and resumes only after deassertion - prevents missed timeouts during power recovery. |
| VCC transient immunity | Rejects ≤40µs VCC glitches at 100mV overdrive - eliminates spurious resets in noisy automotive or industrial environments. |
| No external components | Internal MR pullup, precision reference, and hysteresis eliminate discrete resistors/capacitors - reduces BOM count and PCB area. |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
Use Scenario: Continuous glucose sensing with Bluetooth LE transmission in disposable wearable patches. IC Role / Device Role / Timing Role: Supervises 2.8V lithium coin cell rail and triggers hard reset if firmware hangs during sensor calibration or radio handshake. Use Value: 209s watchdog timeout aligns with maximum BLE connection interval; 170nA ICC extends patch lifetime beyond 14 days. |
Use Scenario: Portable ECG recorder with flash memory logging and USB charging. IC Role / Device Role / Timing Role: Monitors 3.3V system rail and asserts open-drain RESET to microcontroller and analog front-end during brownout or software lockup. Use Value: 150ms reset timeout exceeds µP power-on reset requirement; VCC = +1.1V validity prevents undefined state during battery depletion. |
| Handheld Medical Testers | Industrial Handheld Scanners |
Use Scenario: Battery-operated blood coagulation analyzer with thermal print head and optical sensor. IC Role / Device Role / Timing Role: Provides manual reset via tactile button (MR) and automatic reset on VCC sag during print head activation surge. Use Value: Internal 10kΩ MR pullup eliminates external resistor; open-drain RESET interfaces cleanly with 5V print controller logic. |
Use Scenario: Rugged barcode scanner with 2.4GHz Wi-Fi and motion-activated wake-up. IC Role / Device Role / Timing Role: Supervises 3.0V main rail and detects firmware freeze during RF packet processing using WDI toggling. Use Value: 2.625V threshold matches nominal 2.8V Li-ion discharge curve; 170nA ICC preserves standby time between scans. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK26D3L+T | Same 2.625V threshold, 150ms timeout, 209s watchdog, but push-pull active-low RESET output instead of open-drain. | Requires VCC-referenced reset signaling; cannot share reset bus with other open-drain devices. | Select MAX6864UK26D3L+T only when driving a single µP with push-pull compatibility and no need for wired-OR reset arbitration. |
| TPS3836K26DBVR | 2.63V threshold, 200ms timeout, no watchdog; 1.6µA ICC (vs. 170nA); SOT23-5 pin-compatible but higher quiescent current. | Suitable for basic reset-only applications where ultra-low power is not critical and watchdog functionality is handled externally. | Choose TPS3836K26DBVR for cost-sensitive designs without watchdog needs and where 10× higher ICC is acceptable. |
Compared with MAX6866UK26D3L+T, MAX6864UK26D3L+T offers identical supervision parameters but lacks open-drain flexibility, while TPS3836K26DBVR trades nanopower operation and watchdog capability for lower unit cost and simpler architecture.
Availability
MAX6866UK26D3L+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, and handheld medical testers requiring stable component supply with guaranteed long-term availability and lead-free compliance.
Supply support for MAX6866UK26D3L+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 high-performance analog and mixed-signal ICs for power, sensing, and interface applications, with emphasis on reliability and low-power innovation.
The MAX6854–MAX6869 family was engineered specifically for nanopower microprocessor supervision in battery-critical portable medical and consumer electronics, integrating voltage monitoring, manual reset, and configurable watchdog in minimal footprint.
FAQ
What is the exact reset threshold voltage of the MAX6866UK26D3L+T?
The MAX6866UK26D3L+T has a factory-trimmed reset threshold of 2.625V, with ±2.5% tolerance over the full -40°C to +85°C operating range. This value is confirmed by the "26" suffix in the part number per Maxim's Threshold Suffix Guide (Table 2), and is validated in the Electrical Characteristics table where VTH = 2.625V (typ) under VCC falling conditions.
Does the MAX6866UK26D3L+T include a watchdog timer, and what is its timeout period?
Yes, the MAX6866UK26D3L+T includes a watchdog timer with a typical timeout period of 209s, indicated by the "L" suffix in the part number. This is specified in Table 3 (Watchdog Timeout) and confirmed in the Electrical Characteristics section where tWD = 95s (min), 209s (typ), and 487s (max) under L-suffix configuration.
What type of reset output does the MAX6866UK26D3L+T provide, and how is it configured?
The MAX6866UK26D3L+T provides an open-drain active-low RESET output (Pin 1), as confirmed by the Selector Guide and Pin Description for MAX6866. It requires an external pullup resistor to the target logic voltage and can interface with systems up to 5.5V, enabling flexible level-shifting and wired-OR reset bus implementations.
What is the minimum reset timeout period for the MAX6866UK26D3L+T, and how is it selected?
The MAX6866UK26D3L+T has a fixed minimum reset timeout period of 150ms, denoted by the "D3" suffix per Table 4 (Reset Timeout Periods). This value is factory-set and non-adjustable - unlike MAX6861–MAX6863 variants, it does not feature a CT pin for dynamic timeout selection.
Is the MAX6866UK26D3L+T compatible with 1.8V or 2.5V supply rails, and what is its operational VCC range?
Yes, the MAX6866UK26D3L+T operates across VCC = 1.2V to 5.5V, fully supporting 1.8V and 2.5V systems. Its reset function remains valid down to VCC = +1.1V, and supply current is characterized at 1.8V (170nA typ), making it suitable for modern low-voltage µP platforms without derating concerns.
MAX6866UK26D3L+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- 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:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6866UK26D3L+T FAQ
1.How can I place an order for MAX6866UK26D3L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6866UK26D3L+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 MAX6866UK26D3L+T reliable?
The price and inventory of MAX6866UK26D3L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6866UK26D3L+T is usually 5 days.
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Once your MAX6866UK26D3L+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 MAX6866UK26D3L+T?
For technical support, including MAX6866UK26D3L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6866UK26D3L+T requirements.
6.How does Aetrix verify that MAX6866UK26D3L+T is sourced from the original manufacturer or authorized distributors?
All MAX6866UK26D3L+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 MAX6866UK26D3L+T meets industry standards.
7.What is the process for return or replacement of MAX6866UK26D3L+T?
All MAX6866UK26D3L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6866UK26D3L+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 MAX6866UK26D3L+T part is unused and in its original packaging.
Return procedure for MAX6866UK26D3L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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