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Analog Devices Inc./Maxim Integrated MAX6865UK30D4S+T
- Part No.:
- MAX6865UK30D4S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK30D4S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,838
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Product details
Overview
MAX6865UK30D4S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 3.000V reset threshold (±2.5%), 1200ms 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 power-on reset and code-execution error recovery.
For engineers reviewing the MAX6865UK30D4S+T datasheet, MAX6865UK30D4S+T pinout, MAX6865UK30D4S+T application, or MAX6865UK30D4S+T equivalent, this page delivers verified functional identity, exact pin roles, real-world timing behavior, and validated alternative options for low-power µP reset and watchdog supervision.
Technical Context
The MAX6865UK30D4S+T implements a dual-trigger reset architecture: it asserts reset on VCC falling below 3.000V, MR pin assertion, or WDI inactivity exceeding 3.3s (typ). Its internal watchdog timer clears on any WDI edge, MR assertion, or active reset - enabling robust software execution monitoring without external components.
This device guarantees valid reset output down to VCC = +1.1V, features 250ns MR-to-reset delay, 40µs VCC-to-reset delay, and immunity to sub-40µs VCC transients at 100mV overdrive. It uses BiCMOS process with 2848 transistors and operates across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at VCC = 1.8V; enables multi-year battery life in glucose monitors and pagers. |
| Reset Threshold Voltage | 3.000V ±2.5% (VTH = 3.000V); factory-trimmed for precise brownout detection at 3.0V rail. |
| Reset Timeout Period | 1200ms min (D4 option); ensures full µP initialization before release in embedded systems. |
| Watchdog Timeout | 3.3s typ (S suffix); detects firmware hangs in low-duty-cycle sensor nodes. |
| VCC Operating Range | 1.2V to 5.5V; supports single-cell Li-ion, 3.3V, and 5V logic domains without level-shifting. |
| Reset Output Type | Push-pull active-high RESET; drives µP reset pin directly without pullup resistor. |
| MR Input Behavior | Active-low with 10kΩ internal pullup; accepts CMOS logic or momentary switch; 1µs min pulse width. |
Pinout & Package
MAX6865UK30D4S+T is housed in a lead-free 5-pin SOT23-5 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output; asserts high during fault conditions and holds for 1200ms after recovery. |
| 2 | GND | Ground reference for all internal circuits; must be connected to system ground plane for noise immunity. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (10kΩ); initiates reset when pulled ≤0.3×VCC. |
| 4 | WDI | Watchdog input; requires ≥150ns edge transitions; resets internal timer on every rising/falling edge. |
| 5 | VCC | Supply voltage input and monitored rail; bypass with 0.1µF ceramic capacitor to GND for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current at 1.8V enables >10-year battery operation in wearable health devices. |
| Guaranteed reset validity | RESET remains functional down to VCC = +1.1V, ensuring fail-safe behavior during deep brownout. |
| No external components | Integrates reset timer, watchdog, MR pullup, and voltage reference - eliminates BOM cost and layout area. |
| Transient immunity | Immune to VCC glitches ≤40µs at 100mV overdrive, preventing spurious resets in noisy automotive/industrial environments. |
| Watchdog edge sensitivity | Detects 150ns WDI pulses, supporting high-frequency software heartbeat signals without timing margin loss. |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission in disposable patch form factor. IC Role / Device Role / Timing Role: Supervises 1.8V coin-cell supply and triggers hard reset if firmware stalls during sensor calibration or radio handshake. Use Value: Prevents undetected sensor drift or missed alarms by enforcing 3.3s watchdog timeout and 1200ms post-reset stabilization. |
Use Scenario: Portable ECG recorder with rechargeable Li-ion battery and low-power ARM Cortex-M0+ MCU. IC Role / Device Role / Timing Role: Monitors 3.0V system rail and asserts active-high RESET to hold MCU in reset until stable power and clock are confirmed. Use Value: Ensures deterministic boot sequence after battery insertion or sudden voltage sag, eliminating corrupted memory writes. |
| Smart Pagers | Industrial Handheld Scanners |
Use Scenario: Two-way messaging pager operating on CR2032 battery with intermittent RF wake-up. IC Role / Device Role / Timing Role: Provides manual reset via tactile button (MR) and automatic reset on VCC drop below 3.0V during RF transmit surge. Use Value: Eliminates need for external RC network; 170nA ICC extends shelf life beyond 5 years in standby mode. |
Use Scenario: Rugged barcode scanner powered by 3.7V Li-Po with frequent motor-induced supply transients. IC Role / Device Role / Timing Role: Detects brownout during motor activation and suppresses false resets using 40µs VCC-to-reset delay and glitch rejection. Use Value: Maintains operational continuity during mechanical load spikes without requiring system-level debounce firmware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3837K33DBVR | 3.3V fixed threshold; no watchdog; 200ms reset timeout; 1.2µA ICC. | Suitable only for basic reset supervision without code-execution monitoring. | Select when watchdog functionality is unnecessary and lower cost is prioritized over ultra-low ICC. |
| MAX6369KA29D3+T | 2.93V threshold; 1200ms timeout; no watchdog; 1.5µA ICC; same SOT23-5 package. | Lacks WDI input; intended for simpler power-rail monitoring where software hang detection is handled externally. | Choose for legacy designs migrating from MAX68xx family but omitting watchdog requirements. |
Compared with TPS3837K33DBVR and MAX6369KA29D3+T, the MAX6865UK30D4S+T uniquely combines 3.000V precision threshold, 1200ms timeout, and integrated 3.3s watchdog in a 170nA solution - making it the only choice for long-life, safety-critical portable medical devices requiring autonomous firmware supervision.
Availability
MAX6865UK30D4S+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, smart pagers, and industrial handheld scanners requiring stable component supply and guaranteed long-term availability.
Supply support for MAX6865UK30D4S+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 management, sensing, and interface applications in industrial, medical, and communications markets.
The MAX6854–MAX6869 product line delivers nanopower supervisory circuits specifically engineered for battery-operated medical wearables and portable electronics demanding ultra-low ICC, guaranteed reset validity down to 1.1V, and integrated watchdog reliability.
FAQ
What is the exact reset threshold voltage of the MAX6865UK30D4S+T?
The MAX6865UK30D4S+T has a factory-trimmed reset threshold voltage of 3.000V with ±2.5% tolerance over temperature (–40°C to +85°C), corresponding to the "30" suffix in its part number per Maxim's Threshold Suffix Guide. This value is guaranteed across the full operating range and enables precise brownout detection for 3.0V system rails.
Does the MAX6865UK30D4S+T include a watchdog timer, and what is its timeout period?
Yes, the MAX6865UK30D4S+T includes an integrated watchdog timer with a typical timeout period of 3.3s (S suffix), as confirmed in Table 3 of the datasheet. The timer resets on any rising or falling edge at the WDI pin and expires only if WDI remains static longer than this interval - providing reliable firmware hang detection without external timing components.
What is the reset output configuration of the MAX6865UK30D4S+T?
The MAX6865UK30D4S+T features an active-high push-pull RESET output (Pin 1), meaning it drives high during reset assertion and low during normal operation. Unlike open-drain variants, it requires no external pullup resistor and interfaces directly with µP reset inputs expecting active-high logic levels.
How does the MAX6865UK30D4S+T handle short VCC transients?
The MAX6865UK30D4S+T is immune to VCC transients ≤40µs in duration when the overdrive is 100mV, as shown in the "Maximum VCC Transient Duration vs. Reset Threshold Overdrive" graph. This built-in glitch rejection prevents spurious resets during switching noise or motor-induced supply disturbances in portable equipment.
What is the supply current consumption of the MAX6865UK30D4S+T at 1.8V?
The MAX6865UK30D4S+T draws 170nA typical supply current (ICC) at VCC = 1.8V and TA = +25°C, as specified in the Electrical Characteristics table. This ultra-low quiescent current enables multi-year operation from small coin-cell batteries in applications like glucose monitors and smart pagers.
MAX6865UK30D4S+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:
- 3V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 1.2s Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK30D4S+T FAQ
1.How can I place an order for MAX6865UK30D4S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK30D4S+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 MAX6865UK30D4S+T reliable?
The price and inventory of MAX6865UK30D4S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK30D4S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK30D4S+T?
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4.How is shipping managed for MAX6865UK30D4S+T?
MAX6865UK30D4S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK30D4S+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 MAX6865UK30D4S+T?
For technical support, including MAX6865UK30D4S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK30D4S+T requirements.
6.How does Aetrix verify that MAX6865UK30D4S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK30D4S+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 MAX6865UK30D4S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK30D4S+T?
All MAX6865UK30D4S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK30D4S+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 MAX6865UK30D4S+T part is unused and in its original packaging.
Return procedure for MAX6865UK30D4S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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