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Analog Devices Inc./Maxim Integrated MAX6865UK32D5S+T
- Part No.:
- MAX6865UK32D5S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK32D5S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,304
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Product details
Overview
The MAX6865UK32D5S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, combining voltage monitoring, manual reset input (MR), and watchdog timer (WDI) functions. It asserts an active-high push-pull RESET output when VCC drops below 3.200V (factory-trimmed threshold), MR is pulled low, or the watchdog expires after 3.3s (typ). Designed for ultra-low-power systems, it draws only 170nA (typ) supply current and guarantees valid reset operation down to VCC = +1.1V.
For engineers reviewing the MAX6865UK32D5S+T datasheet, MAX6865UK32D5S+T pinout, MAX6865UK32D5S+T application, or MAX6865UK32D5S+T equivalent, this device serves as a critical power-on reset and software fault recovery component in battery-constrained embedded systems where supply current, brownout immunity, and watchdog timeout precision are design-critical parameters.
Technical Context
The MAX6865UK32D5S+T implements a dual-trigger reset architecture: one path monitors VCC against a factory-trimmed 3.200V threshold with ±2.5% tolerance, while a second path responds to manual reset assertion or watchdog timeout. Its internal watchdog timer clears on any WDI edge and expires if no transition occurs within 3.3s (typ), with temperature-stable performance across –40°C to +85°C.
Reset assertion is latched and held for a fixed 300ms minimum timeout period (D5 option) after VCC rises above threshold and MR deasserts-or after watchdog expiration-ensuring sufficient processor initialization time. The active-high push-pull RESET output drives directly to VCC without external pullup, supporting logic-level compatibility with 1.2V–5.5V supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at +25°C; enables multi-year battery life in portable medical and IoT devices. |
| Reset Threshold Voltage | 3.200V ±2.5%; factory-trimmed for precise brownout detection at 3.3V system rails. |
| Reset Timeout Period | 300ms minimum (D5 option); ensures reliable µP boot sequence completion before release. |
| Watchdog Timeout | 3.3s typical (S suffix); provides robust software execution monitoring without excessive overhead. |
| Operating Voltage Range | 1.2V to 5.5V; supports wide-input battery-powered systems including single-cell Li-ion and coin-cell applications. |
| Reset Valid Down To | VCC = +1.1V; guarantees deterministic reset behavior during deep brownout conditions. |
| MR Input Pullup | 10kΩ internal; eliminates need for external resistor when implementing momentary switch reset. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount. Compact footprint (2.9mm × 1.6mm × 1.1mm) suitable for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-high push-pull) | Drives high during reset assertion; sinks/source current per VOH/VOL specs; no external pullup required. |
| 2 | GND | Ground reference for all internal circuits; must be connected to system ground plane. |
| 3 | MR (manual reset input) | Active-low input with 10kΩ internal pullup to VCC; accepts CMOS logic levels; 1µs minimum pulse width. |
| 4 | WDI (watchdog input) | Edge-sensitive input; clears internal timer on rising/falling edges; rejects glitches <200ns. |
| 5 | VCC | Power supply input and monitored rail; requires 0.1µF bypass capacitor to GND for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical enables >10-year battery life in glucose monitors and wearable sensors. |
| Immunity to short VCC transients | Rejects ≤40µs transients at 100mV overdrive; prevents false resets in noisy power environments. |
| Guaranteed reset validity to VCC = +1.1V | Ensures deterministic behavior during deep undervoltage events common in battery discharge profiles. |
| No external components required | Integrates pullup on MR, bypass-capacitor guidance, and self-contained timing-reduces BOM count and layout area. |
| Watchdog edge-clearing logic | Resets timer on any WDI transition (not just toggles), simplifying firmware implementation and improving fault coverage. |
Applications
| Portable Medical Devices | Wearable Health Monitors |
|---|---|
Use Scenario: Continuous glucose monitoring (CGM) patch worn for 10+ days on a single coin cell. IC Role / Device Role / Timing Role: Supervises 3.3V rail and detects firmware hangs via WDI; asserts RESET to reboot MCU upon brownout or software lockup. Use Value: 170nA supply current extends battery life; 3.200V threshold matches LDO output; 300ms reset hold ensures full bootloader execution. |
Use Scenario: Bluetooth-enabled ECG wristband operating from rechargeable LiPo with intermittent charging. IC Role / Device Role / Timing Role: Monitors VCC during charge/discharge cycles and triggers watchdog reset if BLE stack freezes. Use Value: Valid reset down to 1.1V prevents undefined state during deep discharge; 3.3s watchdog timeout balances responsiveness and power savings. |
| Industrial Sensor Nodes | Low-Power IoT Endpoints |
Use Scenario: Wireless temperature/humidity sensor deployed in remote locations with primary AA batteries. IC Role / Device Role / Timing Role: Provides power-on reset and runtime supervision of ARM Cortex-M0+ MCU; MR pin used for field service reset. Use Value: Internal 10kΩ MR pullup eliminates discrete resistor; SOT23-5 footprint fits tight PCB layouts; D5 timeout aligns with sensor initialization sequence. |
Use Scenario: NB-IoT asset tracker sending periodic GPS reports using intermittent solar harvesting. IC Role / Device Role / Timing Role: Ensures clean startup after cold boot from harvested energy and recovers from firmware crashes during RF transmission. Use Value: 1.2V–5.5V operating range accommodates variable harvester output; edge-triggered WDI reduces firmware polling overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK32D5S+T | Active-low push-pull RESET output instead of active-high; identical threshold, timeout, and watchdog specs. | Requires inverted reset logic on host µP; unsuitable where active-high reset is hardwired or mandated by SoC. | Select MAX6864UK32D5S+T only if target µP accepts active-low reset and board layout allows signal inversion. |
| TPS3836K33DBVR | 3.3V fixed threshold (±2.5%), 200ms reset timeout, no watchdog timer; 2.5µA supply current. | Lacks watchdog functionality; higher ICC limits battery lifetime in always-on applications. | Choose TPS3836K33DBVR only when watchdog is unnecessary and cost is prioritized over ultra-low power. |
Compared with MAX6864UK32D5S+T and TPS3836K33DBVR, the MAX6865UK32D5S+T uniquely delivers active-high reset, nanopower operation, and integrated watchdog in a single SOT23-5 package-enabling simpler firmware integration and longer battery life where both reset polarity and runtime supervision are required.
Availability
MAX6865UK32D5S+T is available at Aetrix Electronics and suitable for portable medical devices, wearable health monitors, industrial sensor nodes, and low-power IoT endpoints requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6865UK32D5S+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-operated equipment, emphasizing nanoscale supply current, wide VCC range, and integrated watchdog reliability.
FAQ
What is the exact reset threshold voltage of the MAX6865UK32D5S+T?
The MAX6865UK32D5S+T has a factory-trimmed reset threshold voltage of 3.200V 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 "32" corresponds to 3.200V nominal. The device guarantees valid reset assertion down to VCC = +1.1V, making it suitable for systems experiencing deep brownout conditions.
Does the MAX6865UK32D5S+T include a watchdog timer, and what is its timeout?
Yes, the MAX6865UK32D5S+T includes a watchdog timer with a typical timeout of 3.3s (S suffix), as specified in Table 3 (Watchdog Timeout). The timer clears on any rising or falling edge at the WDI pin and expires only if no transition occurs within that period. It remains disabled during reset assertion and resumes counting immediately after reset deassertion.
What type of reset output does the MAX6865UK32D5S+T provide?
The MAX6865UK32D5S+T provides an active-high push-pull RESET output (Pin 1), meaning it drives high during reset assertion and low when deasserted. Unlike open-drain variants, it requires no external pullup resistor and is referenced to VCC. Output voltage specifications (VOH/VOL) are guaranteed across the full 1.2V–5.5V supply range.
What is the reset timeout period for the MAX6865UK32D5S+T?
The MAX6865UK32D5S+T uses the D5 reset timeout option, providing a minimum reset pulse width of 300ms after VCC exceeds the threshold and MR is deasserted-or after watchdog expiration. This value is confirmed in Table 4 (Reset Timeout Periods), where D5 maps to 300ms (min)/450ms (typ)/600ms (max).
Is the MAX6865UK32D5S+T compatible with 1.8V or 2.5V supply rails?
Yes, the MAX6865UK32D5S+T operates across 1.2V to 5.5V, fully supporting 1.8V and 2.5V rails. Its 170nA typical supply current and guaranteed reset validity down to VCC = +1.1V make it ideal for multi-rail systems. The RESET output VOH is specified as 0.8×VCC at ISOURCE = 500µA, ensuring interoperability with low-voltage logic families.
MAX6865UK32D5S+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:
- 3.2V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 300ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK32D5S+T FAQ
1.How can I place an order for MAX6865UK32D5S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK32D5S+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 MAX6865UK32D5S+T reliable?
The price and inventory of MAX6865UK32D5S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK32D5S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK32D5S+T?
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4.How is shipping managed for MAX6865UK32D5S+T?
MAX6865UK32D5S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK32D5S+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 MAX6865UK32D5S+T?
For technical support, including MAX6865UK32D5S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK32D5S+T requirements.
6.How does Aetrix verify that MAX6865UK32D5S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK32D5S+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 MAX6865UK32D5S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK32D5S+T?
All MAX6865UK32D5S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK32D5S+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 MAX6865UK32D5S+T part is unused and in its original packaging.
Return procedure for MAX6865UK32D5S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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