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Analog Devices Inc./Maxim Integrated MAX6865UK36D3S+T
- Part No.:
- MAX6865UK36D3S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK36D3S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,372
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Product details
Overview
The MAX6865UK36D3S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, combining voltage monitoring (3.510V factory-trimmed reset threshold), manual reset input (MR), and watchdog timer (209s typical timeout) with ultra-low 170nA typical supply current. It asserts an active-high push-pull RESET output during VCC brownout, MR assertion, or watchdog timeout, ensuring reliable µP initialization in battery-constrained medical and portable systems.
For engineers reviewing the MAX6865UK36D3S+T datasheet, MAX6865UK36D3S+T pinout, MAX6865UK36D3S+T application, or MAX6865UK36D3S+T equivalent, this device is selected for ultra-low-power supervision where guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), and dual-trigger reset (voltage + watchdog) are critical design requirements.
Technical Context
This device implements a precision bandgap-based voltage monitor with ±2.5% reset threshold tolerance over -40°C to +85°C, paired with a temperature-stable RC-based watchdog timer offering two factory-set timeout options (3.3s or 209s typ). The internal 10kΩ MR pullup and glitch rejection (200ns) enable robust manual reset without external components.
The active-high push-pull RESET output delivers VOH ≥ 0.8×VCC at ISOURCE = 500µA (VCC ≥ 2.38V) and VOL ≤ 0.3V at ISINK = 1.2mA (VCC ≥ 2.38V), supporting direct interface to µP reset inputs without level-shifting. Reset timeout is fixed at 150ms (D3 option), validated across full temperature range with <±1% normalized variation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.510V (factory-trimmed, ±2.5% tolerance); ensures reliable brownout detection for 3.3V systems with margin |
| Supply Current | 170nA typical at +25°C; enables multi-year operation on coin-cell batteries in portable medical devices |
| Watchdog Timeout | 209s typical (L-suffix); provides long-duration software execution monitoring for low-duty-cycle embedded firmware |
| Reset Timeout | 150ms minimum (D3 option); guarantees sufficient µP reset hold time for full initialization sequence |
| VCC Operating Range | 1.2V to 5.5V; supports supervision of diverse logic supplies including 1.8V, 2.5V, 3.3V, and 5V rails |
| Reset Validity | Guaranteed to VCC = +1.1V; maintains valid RESET signal during deep brownout conditions |
| MR Input Logic | Active-low with 10kΩ internal pullup; eliminates need for external resistor in manual reset switch implementation |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount. Compact 2.9mm × 1.6mm footprint with 0.95mm height, optimized for space-constrained portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output; drives µP reset pin directly without pullup; sinks 1.2mA / sources 500µA |
| 2 | GND | Ground reference for all internal circuits; must connect to system ground plane with low-inductance path |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC; accepts CMOS logic or open-drain signals |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); clears internal timer on transition; rejects pulses <150ns |
| 5 | VCC | Supply voltage input; monitored for brownout; requires 0.1µF ceramic bypass capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in glucose monitors using CR2032 cells |
| Watchdog Timer | 209s typical timeout (L-suffix) allows infrequent firmware health checks without excessive power overhead |
| Reset Threshold Accuracy | ±2.5% over -40°C to +85°C ensures consistent brownout response across industrial temperature range |
| No External Components | Integrated MR pullup, precision voltage reference, and RC timing eliminate BOM cost and layout area |
| VCC Transient Immunity | Immune to 100mV VCC glitches ≤40µs duration, preventing spurious resets in noisy power environments |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission every 5 minutes. IC Role / Device Role / Timing Role: Supervises 3.3V MCU supply and verifies firmware liveness via WDI toggling between transmissions. Use Value: 209s watchdog timeout aligns with maximum inter-transmission interval, while 170nA ICC extends single-CR2032 battery life beyond 18 months. |
Use Scenario: Portable ECG recorder with sleep mode activated between patient readings. IC Role / Device Role / Timing Role: Monitors 1.8V sensor interface rail and triggers hard reset if MCU fails to service WDI during wake cycles. Use Value: Guaranteed RESET validity to VCC = +1.1V prevents undefined state during partial power collapse in multi-rail systems. |
| Smart Wearables | Industrial Handheld Terminals |
Use Scenario: Fitness tracker with motion-activated display and ambient light sensing. IC Role / Device Role / Timing Role: Provides dual-trigger reset (VCC brownout + WDI stall) for ARM Cortex-M0+ MCU during battery voltage sag. Use Value: 3.510V reset threshold matches nominal 3.3V LDO output, ensuring reset before logic corruption occurs. |
Use Scenario: Rugged barcode scanner operating in warehouse environments with unstable 5V USB power. IC Role / Device Role / Timing Role: Supervises 5V-to-3.3V conversion and validates MCU boot sequence via MR during cold start. Use Value: 150ms reset timeout exceeds typical ARM bootloader initialization window, eliminating premature release. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK36D3S+T | Same 3.510V threshold, 150ms timeout, and 209s watchdog, but features active-low push-pull RESET output | Requires inverted reset logic on µP side; incompatible with µPs expecting active-high reset assertion | Select MAX6864UK36D3S+T only when target µP reset pin is active-low and board layout accommodates different RESET polarity |
| TPS3837K33DBVR | 3.08V fixed threshold, no watchdog timer, 200ms reset timeout, 3.5µA supply current | Lacks software execution monitoring; higher ICC reduces battery life by ~20× compared to MAX6865UK36D3S+T | Choose TPS3837K33DBVR only for cost-sensitive, non-battery-powered applications where watchdog functionality is unnecessary |
Compared with MAX6864UK36D3S+T, the MAX6865UK36D3S+T's active-high RESET simplifies interface to most modern µPs; versus TPS3837K33DBVR, its 170nA ICC and integrated watchdog deliver critical power and reliability advantages in portable medical designs.
Availability
MAX6865UK36D3S+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, smart wearables, and industrial handheld terminals requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6865UK36D3S+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 connectivity in demanding industrial and medical applications.
The MAX6854–MAX6869 family delivers nanopower supervision with integrated watchdog timers, targeting battery-operated portable electronics where ultra-low ICC and dual-trigger reset reliability are essential.
FAQ
What is the exact reset threshold voltage for MAX6865UK36D3S+T?
The MAX6865UK36D3S+T has a factory-trimmed reset threshold of 3.510V, with ±2.5% tolerance over the full -40°C to +85°C operating temperature range. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix '36' corresponds to 3.510V nominal. The MAX6865UK36D3S+T uses this precise threshold to supervise 3.3V systems with adequate headroom against ripple-induced false triggers.
Does MAX6865UK36D3S+T include a watchdog timer, and what is its timeout?
Yes, the MAX6865UK36D3S+T integrates a watchdog timer with a typical timeout of 209 seconds, designated by the 'L' suffix in the part number. This long-duration timeout is validated across temperature and supports infrequent firmware health checks in low-duty-cycle applications like portable medical sensors. The MAX6865UK36D3S+T watchdog clears on any WDI edge and triggers reset if no transition occurs within the timeout window.
What type of reset output does MAX6865UK36D3S+T provide?
The MAX6865UK36D3S+T provides an active-high push-pull RESET output, as confirmed by its pin description (Pin 1 = RESET, active-high) and Selector Guide. This output drives high during reset assertion and low during deassertion, eliminating the need for an external pullup resistor. The MAX6865UK36D3S+T delivers VOH ≥ 0.8×VCC at 500µA source current, ensuring compatibility with standard µP reset inputs.
What is the reset timeout period for MAX6865UK36D3S+T?
The MAX6865UK36D3S+T has a fixed minimum reset timeout period of 150ms, indicated by the 'D3' suffix in the part number. This value is specified in Table 4 (Reset Timeout Periods) as D3 = 150ms (min), 225ms (typ), 300ms (max). The MAX6865UK36D3S+T uses this timeout to guarantee sufficient hold time for complete µP initialization, including flash memory setup and peripheral configuration.
How does MAX6865UK36D3S+T handle supply voltage transients?
The MAX6865UK36D3S+T is immune to short VCC transients up to 40µs duration when the overdrive is 100mV, as shown in the "Maximum VCC Transient Duration vs. Reset Threshold Overdrive" graph. This transient immunity prevents spurious resets during switching noise or load-step events. The MAX6865UK36D3S+T achieves this through internal filtering and hysteresis (0.5% of VTH), making it suitable for noisy battery-powered environments.
MAX6865UK36D3S+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:
- 3.6V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK36D3S+T FAQ
1.How can I place an order for MAX6865UK36D3S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK36D3S+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 MAX6865UK36D3S+T reliable?
The price and inventory of MAX6865UK36D3S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK36D3S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK36D3S+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK36D3S+T transactions.
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4.How is shipping managed for MAX6865UK36D3S+T?
MAX6865UK36D3S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK36D3S+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 MAX6865UK36D3S+T?
For technical support, including MAX6865UK36D3S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK36D3S+T requirements.
6.How does Aetrix verify that MAX6865UK36D3S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK36D3S+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 MAX6865UK36D3S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK36D3S+T?
All MAX6865UK36D3S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK36D3S+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 MAX6865UK36D3S+T part is unused and in its original packaging.
Return procedure for MAX6865UK36D3S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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