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Analog Devices Inc./Maxim Integrated MAX6866UK29D3L+T
- Part No.:
- MAX6866UK29D3L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6866UK29D3L+T.pdf
- Description:
- IC MPU SUPERVISOR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,694
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Product details
Overview
MAX6866UK29D3L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 2.925V reset threshold (suffix '29'), 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 expiration - used in battery-powered glucose monitors and portable medical devices.
For engineers reviewing the MAX6866UK29D3L+T datasheet, MAX6866UK29D3L+T pinout, MAX6866UK29D3L+T application, or MAX6866UK29D3L+T equivalent, this page delivers verified electrical parameters, functional pin roles, real-world use cases, and validated alternative options for low-power embedded system design and brownout protection.
Technical Context
The MAX6866UK29D3L+T integrates voltage monitoring, manual reset input (MR), and watchdog timer (WDI) in a single BiCMOS IC. Its reset assertion is triggered by VCC falling below 2.925V ±2.5%, MR pull-down, or WDI inactivity exceeding 209s (typ). Reset remains asserted for ≥150ms after recovery.
It guarantees valid reset output down to VCC = +1.1V and exhibits immunity to short VCC transients (e.g., ≤40µs for 100mV overdrive). The open-drain RESET output requires an external pullup; MR includes a 10kΩ internal pullup to VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at +25°C - enables multi-year operation on coin-cell batteries |
| Reset Threshold Voltage | 2.925V ±2.5% - factory-trimmed for precise brownout detection at 3.0V nominal rails |
| Reset Timeout Period | 150ms min - ensures µP completes power stabilization before release |
| Watchdog Timeout | 209s typ (L-suffix) - supports long-cycle firmware execution without spurious resets |
| VCC Operating Range | 1.2V to 5.5V - compatible with 1.8V, 2.5V, 3.3V, and 5V systems |
| Reset Output Type | Open-drain active-low - allows level-shifting and wired-OR reset bus implementation |
| Guaranteed Reset Validity | Down to VCC = +1.1V - maintains reliable reset assertion during deep brownout |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, footprint-compatible with industry-standard 5-pin SOT23.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Open-drain active-low reset output; requires external pullup; asserts low on fault or timeout |
| 2 | GND | Ground reference for all internal circuits and reset timing; must connect to system ground plane |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; accepts CMOS logic levels |
| 4 | WDI | Watchdog input; rising/falling edge clears timer; >209s static state triggers reset |
| 5 | VCC | Supply voltage input and monitored rail; bypass with 0.1µF capacitor to GND for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in always-on medical sensors |
| Factory-trimmed VTH | 2.925V ±2.5% eliminates need for external resistor dividers or calibration |
| Watchdog immunity to noise | Detects WDI edges as short as 150ns - robust against EMI-induced glitches |
| No external components | Self-contained supervision: no capacitors, resistors, or external timing elements required |
| Brownout resilience | Valid reset assertion guaranteed down to VCC = +1.1V - prevents undefined µP behavior |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Monitors |
|---|---|
Use Scenario: Continuous glucose sensing in wearable patch pumps requiring multi-month battery life and fail-safe power management. IC Role / Device Role / Timing Role: Supervises 3.0V main rail and triggers hardware reset if firmware hangs or VCC sags during sensor calibration. Use Value: Prevents erroneous insulin dosing by ensuring µP restarts cleanly after brownout or software lockup. |
Use Scenario: Portable ECG/SpO₂ units operating on AA batteries in clinical or home settings. IC Role / Device Role / Timing Role: Monitors 2.8V analog front-end supply and provides 150ms reset hold time to stabilize ADC references post-power-up. Use Value: Eliminates false arrhythmia alarms caused by transient supply dips during wireless transmission bursts. |
| Low-Power IoT Edge Sensors | Industrial Handheld Testers |
Use Scenario: Battery-powered environmental sensor nodes transmitting data every 15 minutes via BLE. IC Role / Device Role / Timing Role: Watches firmware execution via WDI; resets node if BLE stack fails to toggle WDI within 209s. Use Value: Recovers unresponsive nodes autonomously without field technician intervention. |
Use Scenario: Ruggedized handheld multimeters with real-time display and auto-ranging logic. IC Role / Device Role / Timing Role: Asserts reset on 2.925V threshold breach during battery swap or low-voltage operation. Use Value: Guarantees clean initialization of FPGA configuration and display controller after voltage sag. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK29D3L+T | Same 2.925V threshold, 150ms timeout, 209s watchdog, but push-pull active-low RESET output | Requires no external pullup; incompatible with wired-OR reset buses | Select when driving a single µP reset pin directly and board space precludes pullup resistor |
| TPS3838K33DBVR | 3.08V reset threshold, 200ms timeout, no watchdog; 1.6µA ICC - 10× higher quiescent current | Lacks WDI functionality; unsuitable for firmware hang detection | Choose only if watchdog is unnecessary and legacy TI design reuse is prioritized over battery life |
Compared with MAX6866UK29D3L+T, MAX6864UK29D3L+T offers identical supervision specs but different output drive architecture, while TPS3838K33DBVR trades ultra-low power and watchdog capability for TI ecosystem compatibility and simpler BOM - critical for trade-off analysis in portable medical vs. industrial tester designs.
Availability
MAX6866UK29D3L+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered IoT sensors, and industrial handheld testers requiring stable component supply across extended production lifecycles.
Supply support for MAX6866UK29D3L+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, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX6854–MAX6869 family was engineered specifically for nanopower microprocessor supervision in battery-critical systems - delivering sub-µA ICC, factory-trimmed thresholds, and integrated watchdog functionality in minimal SOT23 footprint.
FAQ
What is the exact reset threshold voltage of MAX6866UK29D3L+T?
The MAX6866UK29D3L+T has a factory-trimmed reset threshold voltage of 2.925V, 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 '29' corresponds to 2.925V nominal. The device asserts reset when VCC falls below this threshold and holds reset for ≥150ms after VCC recovers.
Does MAX6866UK29D3L+T include a watchdog timer, and what is its timeout?
Yes, MAX6866UK29D3L+T includes a watchdog timer with a typical timeout of 209s, indicated by the 'L' suffix in the part number. The timer expires if the WDI pin remains static (high or low) beyond this period, triggering a reset for the configured 150ms timeout. The timer clears on any WDI edge, MR assertion, or active reset.
What is the function of Pin 1 (RESET) on MAX6866UK29D3L+T?
Pin 1 of MAX6866UK29D3L+T is the open-drain active-low RESET output. It sinks current when asserted (low), requiring an external pullup resistor to the target µP's logic supply. It transitions low on VCC brownout, MR activation, or watchdog timeout, and remains low for ≥150ms after recovery conditions end.
Can MAX6866UK29D3L+T operate down to 1.2V supply voltage?
Yes, MAX6866UK29D3L+T operates across VCC = 1.2V to 5.5V and guarantees valid reset assertion down to VCC = +1.1V. At 1.2V, supply current is 190nA (typ), and reset output remains functional - enabling use in ultra-low-voltage energy-harvesting or depleted-battery scenarios where other supervisors fail.
Is MAX6866UK29D3L+T pin-compatible with any TI supervisory ICs?
MAX6866UK29D3L+T is not pin-compatible with TI's TPS383x series due to differing pin functions: TPS3838 uses Pin 1 for VDD and Pin 4 for RESET, whereas MAX6866UK29D3L+T assigns Pin 1 to RESET and Pin 4 to WDI. Direct replacement requires PCB redesign; however, it is functionally comparable to TPS3838K33DBVR in supervision role - albeit with added watchdog and lower ICC.
MAX6866UK29D3L+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:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.925V
- 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
MAX6866UK29D3L+T FAQ
1.How can I place an order for MAX6866UK29D3L+T through Aetrix?
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6.How does Aetrix verify that MAX6866UK29D3L+T is sourced from the original manufacturer or authorized distributors?
All MAX6866UK29D3L+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 MAX6866UK29D3L+T meets industry standards.
7.What is the process for return or replacement of MAX6866UK29D3L+T?
All MAX6866UK29D3L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6866UK29D3L+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 MAX6866UK29D3L+T part is unused and in its original packaging.
Return procedure for MAX6866UK29D3L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6866UK29D3L+T Tags
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