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Analog Devices Inc./Maxim Integrated MAX6865UK20D1S+T
- Part No.:
- MAX6865UK20D1S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK20D1S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,649
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Product details
Overview
The MAX6865UK20D1S+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-low push-pull RESET when VCC drops below 2.000V (±2.5%), MR is pulled low, or the watchdog expires after 3.3s (typ). Designed for ultra-low-power systems, it draws only 170nA (typ) at 2.5V and guarantees valid reset down to VCC = +1.1V.
For engineers reviewing the MAX6865UK20D1S+T datasheet, MAX6865UK20D1S+T pinout, MAX6865UK20D1S+T application, or MAX6865UK20D1S+T equivalent, this device is selected for battery-powered medical monitors, portable instrumentation, and embedded systems requiring guaranteed brownout immunity, glitch-resistant reset timing, and watchdog supervision without external components.
Technical Context
The MAX6865UK20D1S+T implements a factory-trimmed voltage monitor with 2.000V reset threshold (±2.5%), a 10ms minimum reset timeout (D1 option), and a 3.3s typical watchdog timeout (S suffix). Its internal 10kΩ MR pullup, 150ns WDI pulse detection, and immunity to ≤40µs VCC transients support robust operation in noisy, low-voltage environments.
It features a push-pull active-high RESET output referenced to VCC, requires no external timing components, and operates across –40°C to +85°C. The watchdog timer clears on any WDI edge and remains disabled while RESET is asserted - ensuring deterministic recovery behavior during power-up or fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.000V ±2.5% - ensures reliable brownout detection for 2.0V nominal supply rails |
| Supply Current | 170nA (typ) at 2.5V - enables multi-year battery life in always-on portable devices |
| Reset Timeout | 10ms (min) - provides sufficient hold time for µP initialization without delaying system wake-up |
| Watchdog Timeout | 3.3s (typ), S-suffix - balances supervision responsiveness with software execution margin |
| VCC Operating Range | 1.2V to 5.5V - supports single-cell Li-ion, coin-cell, and multi-rail embedded systems |
| RESET Valid Down To | VCC = +1.1V - guarantees reset assertion integrity during deep brownout conditions |
| MR Input Logic | Active-low, internally pulled up to VCC via 10kΩ - eliminates need for external pullup |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount. Compact footprint (2.9mm × 1.6mm × 1.1mm) suitable for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output - drives high during reset; compatible with µP reset inputs expecting active-high assertion |
| 2 | GND | Ground reference - must be connected to system ground plane for stable voltage monitoring |
| 3 | MR | Active-low manual reset input - initiates reset when pulled low; internally pulled up to VCC |
| 4 | WDI | Watchdog input - must toggle within 3.3s (typ) to prevent watchdog timeout and reset assertion |
| 5 | VCC | Supply voltage input - monitored for reset threshold violation; bypass with 0.1µF capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in coin-cell–powered devices |
| Glitch-immune VCC monitor | Rejects transients ≤40µs at 100mV overdrive - prevents spurious resets in electrically noisy environments |
| No external components | Integrated timing, pullup, and threshold trimming eliminate capacitors, resistors, and trimming potentiometers |
| Valid RESET to 1.1V | Ensures reset assertion remains functional even during severe brownout - critical for safety-critical shutdown |
| WDI edge-triggered watchdog | Clears on rising or falling edge - supports flexible software polling or toggling without strict duty-cycle constraints |
Applications
| Portable Glucose Monitors | Patient Vital Sign Loggers |
|---|---|
Use Scenario: Continuous glucose sensing with Bluetooth LE transmission and low-power sleep cycles. IC Role / Device Role / Timing Role: Supervises 1.8V MCU supply, triggers reset on brownout, and enforces firmware watchdog discipline via WDI. Use Value: Prevents data corruption during battery sag; 170nA ICC extends disposable sensor life beyond 7 days. |
Use Scenario: Wearable ECG patch recording heart rate and SpO₂ over 24–48 hours on a CR2032 cell. IC Role / Device Role / Timing Role: Monitors 2.0V regulated rail, asserts RESET on undervoltage, and validates firmware liveness via 3.3s watchdog window. Use Value: Guarantees safe shutdown before memory retention loss; 10ms reset timeout enables rapid recovery from transient faults. |
| Handheld Industrial Testers | Low-Power IoT Sensor Nodes |
Use Scenario: Battery-operated multimeter with auto-ranging, display, and USB-C charging. IC Role / Device Role / Timing Role: Provides MR-initiated calibration reset and VCC brownout protection for dual-core ARM Cortex-M0+ MCU. Use Value: Internal 10kΩ MR pullup simplifies front-panel switch design; push-pull RESET avoids external pullup resistor. |
Use Scenario: Soil moisture/temperature node transmitting LoRaWAN packets every 15 minutes using AA alkaline cells. IC Role / Device Role / Timing Role: Supervises 2.0V LDO output, detects supply collapse during RF transmit burst, and forces watchdog reset if sensor firmware hangs. Use Value: 3.3s watchdog timeout aligns with maximum sensor read + transmit duration; 1.2–5.5V operating range accommodates aging battery discharge curve. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK20D1S+T | Active-low push-pull RESET output instead of active-high; identical threshold, timeout, and watchdog specs | Requires µP with active-low reset input; no change to VCC monitoring or WDI interface logic | Select when interfacing with legacy MCUs expecting active-low reset assertion |
| TPS3836K20DBVR | 2.0V threshold, 200ms min reset timeout, no watchdog timer, 1.6µA ICC (typ) | Lacks WDI supervision; higher supply current limits battery lifetime in always-on designs | Choose only if watchdog functionality is unnecessary and longer reset hold time is acceptable |
Compared with MAX6865UK20D1S+T, MAX6864UK20D1S+T offers identical supervision accuracy and ultra-low power but differs in RESET polarity, while TPS3836K20DBVR trades watchdog capability and nanopower operation for broader industry familiarity and longer reset timeout - making it suitable only for non-watchdog, higher-current applications.
Availability
MAX6865UK20D1S+T is available at Aetrix Electronics and suitable for portable medical diagnostics, battery-powered test equipment, and low-power IoT sensor nodes requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6865UK20D1S+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 MAX68xx family delivers nanopower supervisory circuits optimized for battery longevity and reliability in portable health and instrumentation systems - emphasizing ultra-low ICC, guaranteed reset validity at sub-1.2V, and integrated watchdog supervision without external components.
FAQ
What is the exact reset threshold voltage of the MAX6865UK20D1S+T?
The MAX6865UK20D1S+T has a factory-trimmed reset threshold of 2.000V 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 "20" corresponds to 2.000V nominal. The device guarantees valid reset assertion down to VCC = +1.1V, supporting robust operation during deep brownout events.
Does the MAX6865UK20D1S+T include a watchdog timer, and what is its timeout?
Yes, the MAX6865UK20D1S+T includes a watchdog timer with a typical timeout of 3.3 seconds, indicated by the "S" suffix in the part number. The watchdog clears on any rising or falling edge at the WDI pin and triggers reset if no transition occurs within the timeout window. It remains disabled while RESET is asserted, preventing interference during power-up or fault recovery.
What type of RESET output does the MAX6865UK20D1S+T provide?
The MAX6865UK20D1S+T provides an active-high push-pull RESET output (Pin 1), meaning it drives high during reset assertion and low otherwise. This configuration eliminates the need for an external pullup resistor and interfaces directly with MCUs requiring active-high reset inputs. The output is referenced to VCC and maintains valid logic levels across the full 1.2V–5.5V supply range.
How is the reset timeout period configured on the MAX6865UK20D1S+T?
The reset timeout period of the MAX6865UK20D1S+T is fixed at 10ms (minimum), specified by the "D1" suffix in the part number. Unlike the MAX6861–MAX6863 variants, this device does not feature a configurable CT pin - the timeout is factory-set and requires no external components or configuration. This ensures predictable, repeatable reset timing across temperature and voltage.
What is the supply current consumption of the MAX6865UK20D1S+T under normal operation?
The MAX6865UK20D1S+T consumes only 170nA typical supply current (ICC) at VCC = 2.5V and TA = +25°C, as specified in the Electrical Characteristics table. This ultra-low quiescent current enables multi-year operation from primary batteries such as CR2032 or AA cells in always-on portable medical and sensor applications.
MAX6865UK20D1S+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:
- 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
MAX6865UK20D1S+T FAQ
1.How can I place an order for MAX6865UK20D1S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK20D1S+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 MAX6865UK20D1S+T reliable?
The price and inventory of MAX6865UK20D1S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK20D1S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK20D1S+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK20D1S+T transactions.
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4.How is shipping managed for MAX6865UK20D1S+T?
MAX6865UK20D1S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK20D1S+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 MAX6865UK20D1S+T?
For technical support, including MAX6865UK20D1S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK20D1S+T requirements.
6.How does Aetrix verify that MAX6865UK20D1S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK20D1S+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 MAX6865UK20D1S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK20D1S+T?
All MAX6865UK20D1S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK20D1S+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 MAX6865UK20D1S+T part is unused and in its original packaging.
Return procedure for MAX6865UK20D1S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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