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Analog Devices Inc./Maxim Integrated MAX6865UK33D6L+T
- Part No.:
- MAX6865UK33D6L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK33D6L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,086
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Product details
Overview
MAX6865UK33D6L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 3.3V reset threshold (±2.5%), 1200ms minimum reset timeout, manual reset input (MR), and watchdog timer with 209s typical timeout. It monitors VCC in battery-powered medical and portable electronics to ensure reliable µP startup and fault recovery.
For engineers reviewing the MAX6865UK33D6L+T datasheet, MAX6865UK33D6L+T pinout, MAX6865UK33D6L+T application, or MAX6865UK33D6L+T equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options for low-power system supervision design.
Technical Context
The MAX6865UK33D6L+T integrates voltage monitoring, a manual reset input (MR), and a watchdog timer (WDI) with internal 209s timeout (L-suffix). Its reset output remains asserted for ≥600ms after VCC rises above 3.3V and MR deasserts, ensuring µP initialization completes before release.
This device uses BiCMOS process technology and guarantees valid reset assertion down to VCC = +1.1V. It features immunity to short VCC transients (e.g., ≤40µs at 100mV overdrive) and supports push-pull active-high RESET output - confirmed by its MAX6865 variant designation and pin configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at VCC = 1.8V; enables multi-year battery life in glucose monitors and pagers. |
| Reset Threshold | 3.3V ±2.5% (factory-trimmed); matches common 3.3V logic rails without external resistors. |
| Reset Timeout | 600–1200ms (D6 option); ensures full µP boot sequence completion before reset deassertion. |
| Watchdog Timeout | 209s typical (L-suffix); provides long-duration software execution monitoring for infrequent tasks. |
| VCC Operating Range | 1.2V to 5.5V; supports operation across Li-ion, coin-cell, and regulated 3.3V/5V supplies. |
| Reset Output Type | Push-pull active-high; drives high directly without pullup, simplifying interface to µP reset inputs. |
| Guaranteed Reset Validity | To VCC = +1.1V; maintains deterministic reset state during deep brownout conditions. |
Pinout & Package
MAX6865UK33D6L+T is housed in a lead-free 5-pin SOT23-5 package (JEDEC MO-178AA), footprint-compatible with industry-standard 5-lead SOT23 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output; asserts high during fault conditions and remains high for ≥600ms post-recovery. |
| 2 | GND | Ground reference for all internal circuitry; must be connected to system ground plane for noise immunity. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; accepts CMOS-level signals or momentary switch to GND. |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); clears internal timer on transition; triggers reset if idle >209s. |
| 5 | VCC | Supply voltage input and monitored rail; requires 0.1µF bypass capacitor to GND for transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in single-CR2032 medical devices. |
| No external components | Factory-trimmed 3.3V threshold and fixed D6/L watchdog eliminate need for resistive dividers or timing capacitors. |
| Transient immunity | Immune to VCC glitches ≤40µs at 100mV overdrive, preventing spurious resets in noisy portable environments. |
| Valid reset at low VCC | Guaranteed RESET assertion down to VCC = +1.1V, supporting graceful shutdown in deep brownout scenarios. |
| Watchdog edge detection | Detects WDI pulses as short as 150ns, enabling robust software supervision even with fast MCU GPIO toggling. |
Applications
| Portable Glucose Monitors | Patient Vital Sign Loggers |
|---|---|
Use Scenario: Continuous glucose sensing with intermittent Bluetooth transmission powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output, asserts reset on battery sag below 3.3V, and monitors firmware execution via WDI to recover from sensor read hangs. Use Value: Prevents corrupted glucose history storage by ensuring µP only operates within valid voltage window and recovers autonomously from software lockups. |
Use Scenario: Wearable ECG patch recording heart rate and SpO₂ for 72-hour clinical trials. IC Role / Device Role / Timing Role: Monitors main 3.3V supply and triggers 1200ms reset timeout to guarantee complete RAM initialization before data acquisition begins. Use Value: Eliminates field failures caused by incomplete µP boot due to marginal power-up sequencing in compact wearable form factors. |
| Industrial Handheld Scanners | Low-Power Wireless Sensors |
Use Scenario: Rugged barcode scanner using LiPo battery and cold-chain temperature logging. IC Role / Device Role / Timing Role: Provides manual reset via front-panel button (MR) and watchdog supervision of BLE stack execution (WDI) to prevent communication freezes. Use Value: Enables field technicians to force reboot without opening enclosure while maintaining autonomous recovery from BLE stack crashes. |
Use Scenario: Soil moisture sensor node transmitting LoRaWAN packets every 15 minutes on AA alkaline cells. IC Role / Device Role / Timing Role: Supervises 3.3V rail generated by ultra-low-IQ DC/DC converter; uses 209s watchdog to detect missed wake-up events or ADC initialization failures. Use Value: Extends operational lifetime beyond 5 years by avoiding unnecessary resets during normal sleep cycles while catching true firmware hangs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK33D6L+T | Same 3.3V threshold, D6 timeout, L-watchdog, but active-low push-pull RESET output. | Requires µP with active-low reset input; incompatible with active-high reset designs without level-shifting. | Select when interfacing to legacy µPs requiring active-low reset assertion. |
| TPS3837K33DBVR | 3.3V threshold, 200ms reset timeout, no watchdog, 1.5µA supply current - 9× higher than MAX6865UK33D6L+T. | Suitable for cost-sensitive, non-watchdog applications where battery life >5 years is not required. | Choose for simpler systems lacking software supervision needs and where higher ICC is acceptable. |
Compared with MAX6865UK33D6L+T, MAX6864UK33D6L+T offers identical supervision parameters but inverted reset polarity, while TPS3837K33DBVR trades ultra-low power and watchdog capability for lower unit cost and simpler architecture.
Availability
MAX6865UK33D6L+T is available at Aetrix Electronics and suitable for portable medical devices, industrial handheld scanners, and low-power wireless sensors requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6865UK33D6L+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 delivers nanopower supervision for battery-critical systems, with the MAX6865UK33D6L+T specifically optimized for 3.3V µP platforms needing long-duration watchdog coverage and ultra-low quiescent current.
FAQ
What is the reset threshold voltage of MAX6865UK33D6L+T?
The MAX6865UK33D6L+T has a factory-trimmed reset threshold of 3.3V with ±2.5% tolerance over -40°C to +85°C. This value is encoded in the "33" suffix and is guaranteed across temperature and supply voltage range per the Electrical Characteristics table. The MAX6865UK33D6L+T does not require external resistor networks to set this threshold.
Does MAX6865UK33D6L+T include a watchdog timer, and what is its timeout?
Yes, MAX6865UK33D6L+T includes a watchdog timer with a typical timeout of 209 seconds, indicated by the "L" suffix in the part number. The timer resets on any rising or falling edge at the WDI pin and triggers a reset if no edge occurs within the timeout window. This behavior is fully specified in the Watchdog Timeout Period parameter (Table 3).
What type of reset output does MAX6865UK33D6L+T provide?
MAX6865UK33D6L+T provides a push-pull active-high reset output, confirmed by its MAX6865 variant designation and Pin Description table. Pin 1 outputs high during reset assertion and low when deasserted, eliminating the need for an external pullup resistor and simplifying interface to µPs with active-high reset inputs.
What is the minimum reset timeout period for MAX6865UK33D6L+T?
The MAX6865UK33D6L+T has a minimum reset timeout period of 600ms, specified by the "D6" suffix. This is the guaranteed minimum duration that the RESET output remains asserted after VCC exceeds the 3.3V threshold and MR is deasserted, ensuring sufficient time for µP power stabilization and register initialization.
Is MAX6865UK33D6L+T compatible with 1.8V supply systems?
Yes, MAX6865UK33D6L+T operates across VCC = 1.2V to 5.5V and guarantees valid reset assertion down to VCC = +1.1V. At 1.8V, its typical supply current is 170nA, and its RESET output meets VOH ≥ 0.8 × VCC and VOL ≤ 0.3V specifications - making it fully functional in 1.8V logic domains.
MAX6865UK33D6L+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:
- 3.3V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 600ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK33D6L+T FAQ
1.How can I place an order for MAX6865UK33D6L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK33D6L+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 MAX6865UK33D6L+T reliable?
The price and inventory of MAX6865UK33D6L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK33D6L+T is usually 5 days.
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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 MAX6865UK33D6L+T?
For technical support, including MAX6865UK33D6L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK33D6L+T requirements.
6.How does Aetrix verify that MAX6865UK33D6L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK33D6L+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 MAX6865UK33D6L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK33D6L+T?
All MAX6865UK33D6L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK33D6L+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 MAX6865UK33D6L+T part is unused and in its original packaging.
Return procedure for MAX6865UK33D6L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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