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Analog Devices Inc./Maxim Integrated MAX6865UK24D6S+T
- Part No.:
- MAX6865UK24D6S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK24D6S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,853
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Product details
Overview
The MAX6865UK24D6S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, a factory-trimmed 2.4V reset threshold (±2.5%), 1200ms minimum reset timeout, manual reset input (MR), and watchdog timer with 3.3s typical timeout. It asserts an active-high push-pull RESET during VCC brownout, MR assertion, or watchdog expiration - used in battery-powered medical monitors and portable instrumentation.
For engineers reviewing the MAX6865UK24D6S+T datasheet, MAX6865UK24D6S+T pinout, MAX6865UK24D6S+T application, or MAX6865UK24D6S+T equivalent, key selection criteria include guaranteed RESET validity down to VCC = +1.1V, immunity to sub-40µs VCC transients, watchdog pulse detection as short as 150ns, and compatibility with CMOS-level MR/WDI inputs.
Technical Context
This device integrates three core functions: precision voltage monitoring with hysteresis (0.5% of VTH), a monostable reset timeout generator (D6 = 600–1200ms), and a watchdog timer that clears on any WDI edge and expires if WDI remains static beyond 3.3s (typ). Its BiCMOS process enables stable operation across –40°C to +85°C with no external components required.
The MAX6865UK24D6S+T uses an internal 10kΩ pullup on MR and accepts WDI logic levels defined by 0.3×VCC (VIL) and 0.7×VCC (VIH). RESET output is push-pull active-high, sourcing ≥0.8×VCC at 500µA when deasserted and sinking ≤0.3V at 1.2mA when asserted - eliminating need for external pullups or level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at VCC = 1.8V; enables >10-year battery life in glucose monitors and wearables. |
| Reset Threshold | 2.4V ±2.5% (VTH = 2.34V–2.46V); factory-trimmed for precise brownout detection at 2.4V rails. |
| Reset Timeout | 600–1200ms min (D6 option); ensures full µP initialization before release in low-power systems. |
| Watchdog Timeout | 3.3s typ (S suffix); detects firmware hangs without requiring high-frequency software polling. |
| VCC Operating Range | 1.2V to 5.5V; supports single-cell Li-ion (3.0–4.2V), coin-cell (1.5–3.0V), and 3.3V/5V logic domains. |
| RESET Output Type | Push-pull active-high; drives µP reset pin directly without external components or pull resistors. |
| Guaranteed RESET Validity | Down to VCC = +1.1V; maintains deterministic reset state during deep brownout conditions. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount. Footprint compatible with industry-standard 5-pin SOT23 layouts.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output; asserts high during fault conditions and holds for full timeout period. |
| 2 | GND | Ground reference for all internal circuits; must be connected to system ground plane. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; accepts CMOS logic or open-drain signals. |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); clears internal timer on each transition; detects pulses ≥150ns. |
| 5 | VCC | Supply voltage input and monitored rail; requires 0.1µF bypass capacitor to GND for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables multi-year operation on CR2032 coin cells in portable diagnostics. |
| Reset threshold accuracy | ±2.5% over temperature ensures reliable brownout detection without margining overhead in 2.4V systems. |
| Watchdog edge sensitivity | Detects 150ns WDI pulses - supports low-duty-cycle firmware heartbeat signals without added timing overhead. |
| VCC transient immunity | Immune to 100mV VCC glitches ≤40µs - prevents spurious resets in noisy automotive or industrial environments. |
| No external components | Integrates MR pullup, reset timer, and watchdog logic - reduces BOM count and PCB area vs. discrete solutions. |
Applications
| Portable Medical Monitoring | Battery-Powered IoT Sensors |
|---|---|
|
Use Scenario: Continuous glucose monitor operating from a single CR2032 cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Supervises 2.4V analog front-end and µP supply; triggers hardware reset on brownout or firmware lockup. Use Value: 170nA ICC extends battery life beyond 3 years; 3.3s watchdog timeout aligns with sensor sampling intervals without excessive polling load. |
Use Scenario: Remote environmental sensor node powered by energy harvesting, waking every 5 minutes. IC Role / Device Role / Timing Role: Monitors harvested supply rail; asserts RESET if voltage sags below 2.4V during cold start or low-light conditions. Use Value: Guaranteed RESET validity to VCC = +1.1V ensures deterministic reset even during marginal energy harvest; D6 timeout allows full µP boot sequence before data acquisition. |
| Industrial Handheld Terminals | Low-Power Wearable Electronics |
|
Use Scenario: Ruggedized barcode scanner using Li-ion battery with wide temperature range (-20°C to +60°C). IC Role / Device Role / Timing Role: Provides power-on reset and watchdog supervision for ARM Cortex-M0 host processor. Use Value: Immunity to 40µs VCC transients prevents false resets during motor-driven barcode scanning; MR input enables field-service hard reset via button. |
Use Scenario: Fitness tracker with optical heart-rate sensor and Bluetooth LE, powered by 3.7V LiPo. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output feeding sensor hub and radio; resets system on firmware hang detected via WDI toggling. Use Value: Push-pull active-high RESET eliminates need for external pullup resistor - saving board space and leakage path in compact wearable form factor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK24D6S+T | No CT pin; identical reset threshold (2.4V), timeout (D6), and watchdog (S); differs only in RESET polarity (active-low push-pull). | Requires µP with active-low reset input; not suitable where active-high reset is mandatory. | Select MAX6864UK24D6S+T only if target µP accepts active-low reset and board layout accommodates pin 1 reassignment. |
| TPS3836K24DBVR | Higher 1.2µA ICC; same 2.4V threshold and 1200ms timeout; no watchdog; SOT23-5 pin-compatible but lacks WDI functionality. | Applicable only in systems where watchdog supervision is handled separately (e.g., by µP internal WDT). | Choose TPS3836K24DBVR only when ultra-low current is non-critical and external watchdog logic already exists. |
Compared with MAX6864UK24D6S+T and TPS3836K24DBVR, the MAX6865UK24D6S+T uniquely delivers active-high RESET, integrated watchdog, and nanopower operation in one 5-pin SOT23 - enabling simpler, longer-life designs where all three features are required simultaneously.
Availability
MAX6865UK24D6S+T is available at Aetrix Electronics and suitable for portable medical monitoring, battery-powered IoT sensors, industrial handheld terminals, and low-power wearable electronics requiring stable component supply across extended product lifecycles.
Supply support for MAX6865UK24D6S+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, sensing, and interface applications - with emphasis on low-power, high-reliability solutions for demanding environments.
The MAX6854–MAX6869 family was developed specifically for nanopower microprocessor supervision in battery-constrained systems, integrating voltage monitoring, manual reset, and watchdog functionality into minimal-footprint packages without external components.
FAQ
What is the exact reset threshold voltage of the MAX6865UK24D6S+T?
The MAX6865UK24D6S+T has a factory-trimmed reset threshold of 2.4V with ±2.5% tolerance (2.34V to 2.46V), specified over –40°C to +85°C. This value is fixed per the "24" suffix in the part number and confirmed in Table 2 (Threshold Suffix Guide) of the datasheet. The MAX6865UK24D6S+T does not support user-adjustable thresholds.
Does the MAX6865UK24D6S+T require external components for basic operation?
No, the MAX6865UK24D6S+T operates autonomously with no external components required. It includes an internal 10kΩ pullup on MR, integrated reset timeout generator, and self-contained watchdog timer. Only a 0.1µF ceramic bypass capacitor from VCC to GND is recommended for noise immunity - not strictly required but strongly advised per the Typical Operating Circuit.
How does the watchdog timer in the MAX6865UK24D6S+T respond to signal edges?
The MAX6865UK24D6S+T watchdog timer clears on any rising or falling edge at the WDI pin and expires only if WDI remains static (high or low) for longer than 3.3s (typ). It detects pulses as narrow as 150ns and ignores glitches shorter than that. The timer remains suspended while RESET is asserted, resuming counting only after RESET deasserts.
Can the MAX6865UK24D6S+T operate reliably at VCC = 1.2V?
Yes, the MAX6865UK24D6S+T is fully specified to operate from VCC = 1.2V to 5.5V. Its reset output remains valid down to VCC = +1.1V, and supply current is characterized at 1.2V (190nA typ). At 1.2V, RESET still sources ≥0.8×VCC at 200µA and sinks ≤0.3V at 500µA - ensuring robust interfacing with low-voltage µPs.
What is the function of Pin 1 (RESET) on the MAX6865UK24D6S+T?
Pin 1 of the MAX6865UK24D6S+T is the active-high push-pull RESET output. It transitions high during VCC brownout, MR assertion, or watchdog timeout, and remains high for the full D6 timeout period (600–1200ms) after fault clearance. Unlike open-drain variants, it requires no external pullup and drives µP reset pins directly.
MAX6865UK24D6S+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:
- 2.4V
- 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
MAX6865UK24D6S+T FAQ
1.How can I place an order for MAX6865UK24D6S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK24D6S+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 MAX6865UK24D6S+T reliable?
The price and inventory of MAX6865UK24D6S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK24D6S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK24D6S+T?
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4.How is shipping managed for MAX6865UK24D6S+T?
MAX6865UK24D6S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK24D6S+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 MAX6865UK24D6S+T?
For technical support, including MAX6865UK24D6S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK24D6S+T requirements.
6.How does Aetrix verify that MAX6865UK24D6S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK24D6S+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 MAX6865UK24D6S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK24D6S+T?
All MAX6865UK24D6S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK24D6S+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 MAX6865UK24D6S+T part is unused and in its original packaging.
Return procedure for MAX6865UK24D6S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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