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Analog Devices Inc./Maxim Integrated MAX6865UK42D1S+T
- Part No.:
- MAX6865UK42D1S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK42D1S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,834
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Product details
Overview
MAX6865UK42D1S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 4.200V reset threshold (±2.5%), 10ms minimum reset timeout, manual reset input (MR), and watchdog timer with 3.3s typical timeout. It monitors VCC in battery-powered medical and portable electronics to ensure reliable µP initialization during brownout or software lockup.
For engineers reviewing the MAX6865UK42D1S+T datasheet, MAX6865UK42D1S+T pinout, MAX6865UK42D1S+T application, or MAX6865UK42D1S+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed reset/watchdog timing, true low-power behavior down to VCC = 1.1V, and validated alternative options for portable equipment design.
Technical Context
The MAX6865UK42D1S+T integrates voltage monitoring, a manual reset input (MR), and a watchdog timer that triggers reset if WDI remains static beyond 3.3s (typ). Its internal reset timeout generator ensures 10ms minimum assertion after VCC recovery or MR deassertion.
It uses BiCMOS process with 2848 transistors, guarantees valid reset output down to VCC = 1.1V, and features immunity to VCC transients ≤40µs at 100mV overdrive. The active-low push-pull RESET output is referenced to VCC and sinks ≥50µA at 0.3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at VCC = 1.8V - enables multi-year operation on coin-cell batteries |
| Reset Threshold | 4.200V ±2.5% - factory-trimmed for precise brownout detection at 4.2V nominal supply |
| Reset Timeout | 10ms minimum - ensures µP reset pulse meets minimum hold-time requirements |
| Watchdog Timeout | 3.3s typical (S-suffix) - detects firmware hangs in low-duty-cycle embedded applications |
| VCC Operating Range | 1.2V to 5.5V - supports wide-input battery systems including single Li-ion and dual alkaline |
| Reset Output Type | Active-low push-pull - eliminates external pull-up resistor and simplifies interface to µP reset pin |
| MR Input Logic | Active-low with 10kΩ internal pull-up - allows direct switch-to-GND connection without external components |
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-low push-pull reset output - asserts low during VCC undervoltage, MR assertion, or watchdog timeout; drives µP reset pin directly |
| 2 | GND | Ground reference - must connect to system ground plane for stable reset threshold and noise immunity |
| 3 | MR | Active-low manual reset input - initiates reset when pulled low; internally pulled up to VCC (10kΩ) |
| 4 | WDI | Watchdog input - requires edge transition every <3.3s to prevent reset; accepts CMOS-level signals |
| 5 | VCC | Supply voltage input - monitored for reset generation; bypass with 0.1µF capacitor to GND for noise rejection |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical enables >10-year shelf life in glucose monitors powered by CR2032 cells |
| Guaranteed reset validity | Valid down to VCC = 1.1V - ensures reset assertion even during deep brownout before µP power collapse |
| No external components | Internal MR pull-up, no RC timing network required - reduces BOM count and PCB area in space-constrained wearables |
| Transient immunity | Immune to VCC glitches ≤40µs at 100mV overdrive - prevents spurious resets in noisy automotive or industrial environments |
| Watchdog edge sensitivity | Detects WDI pulses as short as 150ns - supports high-frequency software heartbeat signaling without timing margin loss |
Applications
| Portable Glucose Monitors | Patient Vital Sign Loggers |
|---|---|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission in disposable wearable patches. IC Role / Device Role / Timing Role: Supervises 1.8V coin-cell supply and resets ARM Cortex-M0+ MCU upon brownout or firmware hang detected via WDI. Use Value: 170nA ICC extends battery life beyond 18 months; 4.200V threshold matches LiPo full-charge voltage for accurate end-of-life detection. |
Use Scenario: Battery-powered ECG/SpO₂ recorder worn for 72-hour clinical monitoring. IC Role / Device Role / Timing Role: Provides fail-safe reset during intermittent charging cycles and validates µP operation via 3.3s watchdog timeout. Use Value: Push-pull RESET eliminates pull-up resistor, reducing leakage paths critical for sub-µA sleep current compliance. |
| Smart Hearing Aids | Wireless Remote Patient Controllers |
Use Scenario: Miniaturized rechargeable hearing aid with real-time audio processing and NFC programming. IC Role / Device Role / Timing Role: Monitors 1.2V–1.8V regulated rail and asserts reset if VCC drops below 4.200V (indicating charger disconnect or battery fault). Use Value: 10ms reset timeout satisfies ARM reset hold-time spec while minimizing wake-up latency after power recovery. |
Use Scenario: Handheld BLE controller for hospital infusion pumps with tactile feedback and low-power display. IC Role / Device Role / Timing Role: Combines MR-initiated factory reset and WDI-monitored firmware execution to prevent command lockup. Use Value: MR internal 10kΩ pull-up enables momentary switch interface without external R, saving board space in compact plastic housing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK42D1S+T | No CT pin; identical 4.200V threshold, 10ms timeout, 3.3s watchdog, and push-pull RESET | Lacks pin-selectable timeout - fixed D1 option only, no flexibility for future design variants | Select MAX6865UK42D1S+T when MR and WDI functions are required with same timing specs and pinout |
| TPS3836K33DBVR | 3.3V fixed threshold, 200ms timeout, no watchdog, open-drain RESET, 1.5µA ICC | Higher supply current limits battery life; lacks WDI for firmware supervision | Choose only if system operates at 3.3V nominal and watchdog functionality is unnecessary |
Compared with MAX6864UK42D1S+T, the MAX6865UK42D1S+T offers identical core supervision but belongs to a variant group with MR support confirmed in all configurations; versus TPS3836K33DBVR, it delivers 10× lower ICC and integrated watchdog-critical for long-life medical devices.
Availability
MAX6865UK42D1S+T is available at Aetrix Electronics and suitable for portable glucose monitors, patient vital sign loggers, smart hearing aids, and wireless remote patient controllers requiring stable component supply across extended production lifecycles.
Supply support for MAX6865UK42D1S+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 ultra-low-power microprocessor supervision in battery-critical medical and portable electronics, emphasizing nanoscale ICC, guaranteed reset validity below 1.2V, and integrated watchdog reliability.
FAQ
What is the exact reset threshold voltage of MAX6865UK42D1S+T?
The MAX6865UK42D1S+T has a factory-trimmed reset threshold of 4.200V with ±2.5% tolerance over temperature (-40°C to +85°C), as defined by the "42" suffix per Maxim's Threshold Suffix Guide. This value is measured at VCC falling and ensures precise brownout detection for 4.2V nominal Li-ion systems. The MAX6865UK42D1S+T guarantees reset assertion before VCC drops below 4.095V and release after VCC rises above 4.305V.
Does MAX6865UK42D1S+T include a watchdog timer, and what is its timeout?
Yes, the MAX6865UK42D1S+T includes a watchdog timer with a typical timeout of 3.3s, indicated by the "S" suffix in the part number. The timer expires if the WDI pin remains static (high or low) beyond this period, triggering a reset pulse for the configured 10ms minimum duration. The MAX6865UK42D1S+T watchdog clears on any WDI edge, MR assertion, or active RESET, enabling robust firmware supervision in portable medical devices.
What is the supply current of MAX6865UK42D1S+T at 1.8V and room temperature?
The MAX6865UK42D1S+T draws 170nA typical supply current at VCC = 1.8V and TA = +25°C, as specified in the Electrical Characteristics table. This ultra-low ICC enables multi-year operation on standard coin-cell batteries and is confirmed across the full operating temperature range (-40°C to +85°C), with maximum ICC remaining under 400nA at 1.8V. The MAX6865UK42D1S+T achieves this while maintaining full reset, MR, and watchdog functionality.
What package type and pin count does MAX6865UK42D1S+T use?
The MAX6865UK42D1S+T is housed in a 5-pin SOT23-5 package with lead-free finish, as confirmed in the Ordering Information table and Pin Configurations diagram. Pin 1 is RESET (active-low push-pull), Pin 2 is GND, Pin 3 is MR, Pin 4 is WDI, and Pin 5 is VCC. This compact 2.9mm × 1.6mm footprint is optimized for space-constrained portable electronics such as hearing aids and wearable sensors.
Can MAX6865UK42D1S+T operate reliably down to 1.1V supply voltage?
Yes, the MAX6865UK42D1S+T guarantees valid reset output functionality down to VCC = 1.1V, as explicitly stated in the Absolute Maximum Ratings and Detailed Description sections. Below this voltage, RESET remains asserted to hold the microprocessor in reset, preventing undefined operation. This feature ensures fail-safe behavior during deep brownout conditions where other supervisors may lose output control. The MAX6865UK42D1S+T maintains this specification across its full -40°C to +85°C temperature range.
MAX6865UK42D1S+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:
- 4.2V
- 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
MAX6865UK42D1S+T FAQ
1.How can I place an order for MAX6865UK42D1S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK42D1S+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 MAX6865UK42D1S+T reliable?
The price and inventory of MAX6865UK42D1S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK42D1S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK42D1S+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK42D1S+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6865UK42D1S+T?
MAX6865UK42D1S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK42D1S+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 MAX6865UK42D1S+T?
For technical support, including MAX6865UK42D1S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK42D1S+T requirements.
6.How does Aetrix verify that MAX6865UK42D1S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK42D1S+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 MAX6865UK42D1S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK42D1S+T?
All MAX6865UK42D1S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK42D1S+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 MAX6865UK42D1S+T part is unused and in its original packaging.
Return procedure for MAX6865UK42D1S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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