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Analog Devices Inc./Maxim Integrated MAX6369KA+T
- Part No.:
- MAX6369KA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6369KA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:6,698
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Product details
Overview
MAX6369KA+T from Maxim Integrated is a pin-selectable watchdog timer IC designed to supervise microprocessor activity in safety-critical embedded systems. It features open-drain active-low WDO output with 100ms pulse width, 1ms–60s pin-selectable startup delay and watchdog timeout periods, and operates from +2.5V to +5.5V supply. Used in automotive and industrial controllers to detect software hangs and trigger system reset.
For engineers reviewing the MAX6369KA+T datasheet, MAX6369KA+T pinout, MAX6369KA+T application, or MAX6369KA+T equivalent, key selection criteria include its AEC-Q100-qualified variant status, SOT23-8 package compatibility, 8µA supply current at +25°C, and ability to reconfigure timing without power cycling via SET0/SET1/SET2 logic inputs.
Technical Context
The MAX6369KA+T implements a dual-phase supervision architecture: an initial startup delay (programmable 1ms–60s) precedes activation of the main watchdog timeout period (also 1ms–60s), both set by three logic-controlled pins (SET0/SET1/SET2). Its internal transition detector clears the timer on any valid rising or falling edge at WDI ≥100ns wide.
It uses BiCMOS process technology (1500 transistors), supports operation from −40°C to +125°C, and includes internal setup time (300µs) after power-up or timing configuration changes. The open-drain WDO output requires an external pullup and asserts low for ≥100ms upon timeout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.5V to +5.5V - powers directly from common logic rails without LDO regulation |
| Supply Current (TA = +25°C) | 8µA typical - enables ultra-low-power operation in battery-backed or energy-constrained systems |
| Watchdog Output Type | Open-drain active-low - allows flexible voltage-level translation and wired-OR fault signaling |
| WDO Pulse Width | ≥100ms - ensures reliable reset assertion across diverse µP reset input timing requirements |
| Startup Delay Range | 1ms to 60s (pin-selectable) - accommodates boot-time variability across MCU families and firmware initialization sequences |
| Watchdog Timeout Range | 1ms to 60s (pin-selectable) - matches real-time execution windows from fast control loops to long polling intervals |
| Operating Temperature | −40°C to +125°C - certified for under-hood automotive and industrial ambient environments |
| WDI Input Pulse Width | ≥100ns - tolerates fast digital toggling without requiring dedicated timing hardware |
Pinout & Package
MAX6369KA+T is housed in an 8-pin SOT23 package (package code K8SN+1, outline 21-0078), measuring 2.9mm × 1.6mm × 1.1mm, RoHS-compliant and tape-and-reel packaged (2500 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - WDI | Watchdog Input | Edge-sensitive input; timer resets on rising or falling edge ≥100ns; tied to GND via ≤100kΩ if unused |
| 2 - GND | Ground Reference | Primary return path for supply and signal currents; must be low-impedance connection to system ground plane |
| 3 - N.C. | No Connection | Internally unconnected; must remain floating - no PCB trace or solder mask opening required |
| 4 - SET0 | Timing Configuration Bit 0 | Logic input selecting startup delay and timeout values per Table 1; driven to VCC or GND only |
| 5 - SET1 | Timing Configuration Bit 1 | Logic input selecting startup delay and timeout values per Table 1; driven to VCC or GND only |
| 6 - SET2 | Timing Configuration Bit 2 | Logic input selecting startup delay and timeout values per Table 1; driven to VCC or GND only |
| 7 - WDO | Watchdog Output | Open-drain active-low output; requires external pullup (e.g., 10kΩ to VCC); sinks ≥1.2mA when asserted |
| 8 - VCC | Supply Voltage Input | +2.5V to +5.5V power rail; bypass with 0.1µF ceramic capacitor placed ≤0.2 inches from pin |
Key Features
| Feature | Design Value |
|---|---|
| Pin-selectable timing configuration | Three logic inputs (SET0–SET2) enable 8 distinct startup delay/watchdog timeout combinations without firmware or external components |
| Watchdog disable capability | Setting SET2=HIGH, SET1=LOW, SET0=LOW disables watchdog function entirely - allows safe debug mode entry without hardware modification |
| First-power-up immunity | 300µs internal setup time prevents false timeout assertion during VCC ramp and initial logic settling |
| Robust noise immunity | 100ns minimum WDI pulse width requirement rejects EMI-induced glitches while accepting standard CMOS toggling |
| AEC-Q100 qualification | Qualified per AEC-Q100 Rev H Grade 0 (−40°C to +125°C) - meets automotive reliability and stress-test requirements |
| No external timing components | Internal oscillator eliminates need for capacitors, resistors, or crystals - reduces BOM count and layout area |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Main Controller |
|---|---|
|
Use Scenario: Monitors real-time firmware execution in gasoline/diesel engine management systems where missed CAN message deadlines or sensor read failures indicate critical failure. IC Role / Device Role / Timing Role: Standalone hardware watchdog that independently verifies µP instruction flow outside the main application stack, asserting WDO to reset the MCU if no WDI toggle occurs within configured timeout. Use Value: Prevents unsafe operating states (e.g., uncontrolled fuel injection) by enforcing deterministic recovery before thermal or mechanical damage occurs. |
Use Scenario: Supervises ladder logic execution in programmable logic controllers deployed in factory automation lines handling high-voltage motor drives. IC Role / Device Role / Timing Role: Hardware-level safety monitor that validates cyclic scan completion of I/O processing routines, independent of OS scheduler jitter or task starvation. Use Value: Guarantees machine stoppage within ≤100ms of detected hang, satisfying SIL-2 functional safety requirements for personnel protection. |
| Railway Signaling Onboard Computer | Medical Infusion Pump Controller |
|
Use Scenario: Ensures fail-safe behavior in onboard train control computers managing ATP (Automatic Train Protection) algorithms under vibration, temperature extremes, and EMI. IC Role / Device Role / Timing Role: Redundant watchdog supervisor verifying deterministic response to track circuit inputs and brake command outputs, with startup delay accommodating cold-boot diagnostics. Use Value: Enables automatic safe state transition (e.g., full service brake application) upon timeout - meeting EN 50126/50128 RAMS requirements. |
Use Scenario: Validates continuous operation of infusion pump firmware responsible for precise drug delivery rate calculation and motor control in hospital settings. IC Role / Device Role / Timing Role: Independent hardware monitor detecting infinite loops or stack overflow in safety-critical dose computation routines, triggering immediate pump halt and alarm. Use Value: Limits maximum undetected fault latency to ≤100ms, supporting IEC 62304 Class C software safety classification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar watchdog timer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6370KA+T | Push-pull WDO output with 1ms pulse width; identical pinout and timing selection logic | Better suited for µPs requiring short, well-defined reset pulses without external pullup | Select when system reset input has strict minimum pulse width <10ms or lacks pullup infrastructure |
| TPS3823DBVR | Fixed 200ms watchdog timeout; no pin-selectable timing; 3.3V/5V supply options; SOT23-5 package | Limited configurability but lower cost and smaller footprint for non-variable timing needs | Select when timing requirements are static and board space is constrained - requires redesign due to different pin count and assignment |
Compared with MAX6369KA+T, MAX6370KA+T offers faster reset assertion but requires push-pull-compatible reset inputs, while TPS3823DBVR trades flexibility for size and cost savings in fixed-timing applications - neither is pin-compatible, but both serve overlapping safety-monitoring roles.
Availability
MAX6369KA+T is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, railway onboard computers, and medical infusion pump controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6369KA+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, automotive, and communications applications.
The MAX6369–MAX6374 family was engineered specifically for high-reliability microprocessor supervision in harsh environments, emphasizing configurability, low power, and AEC-Q100 compliance for functional safety-critical systems.
FAQ
What is the watchdog output type and drive capability of the MAX6369KA+T?
The MAX6369KA+T features an open-drain, active-low watchdog output (WDO) that sinks ≥1.2mA when asserted at VCC > 2.7V. It requires an external pullup resistor (typically 10kΩ) to VCC or another logic rail up to +5.5V. This configuration enables level-shifting, wired-OR fault signaling, and compatibility with diverse µP reset input thresholds - a core design feature of the MAX6369KA+T.
How does the MAX6369KA+T handle power-up and configuration changes?
The MAX6369KA+T incorporates a 300µs internal setup time (tSETUP) after power-up or any change to SET0/SET1/SET2 pins, during which WDI transitions are ignored to prevent false timeouts. This ensures deterministic initialization and avoids spurious resets during voltage ramp or logic reconfiguration - a guaranteed behavior documented in the MAX6369KA+T electrical characteristics table.
Can the MAX6369KA+T watchdog be disabled without power cycling?
Yes - the MAX6369KA+T watchdog can be fully disabled by setting SET2 = HIGH, SET1 = LOW, and SET0 = LOW. In this mode, WDO remains high indefinitely and no timeout monitoring occurs. The function resumes immediately upon changing to any other SET_ combination, with a 300µs setup delay - enabling safe debug mode entry without hardware intervention or power interruption for the MAX6369KA+T.
What is the minimum WDI pulse width the MAX6369KA+T recognizes?
The MAX6369KA+T requires a minimum WDI pulse width of 100ns for reliable edge detection. This specification ensures immunity to sub-100ns EMI-induced glitches while accepting standard CMOS-level toggling from most microcontrollers and FPGAs - a validated timing parameter confirmed in the MAX6369KA+T Electrical Characteristics table under "Watchdog Input Pulse Width".
Is the MAX6369KA+T qualified for automotive applications?
Yes - the MAX6369KA+T is AEC-Q100 qualified (Grade 0, −40°C to +125°C) and explicitly listed in the manufacturer's Benefits and Features section as AEC-Q100 Qualified. Its qualification covers stress testing for temperature cycling, humidity, and ESD, making it suitable for under-hood and chassis-mounted automotive modules - a verified attribute of the MAX6369KA+T.
MAX6369KA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Watchdog Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6369KA+T FAQ
1.How can I place an order for MAX6369KA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6369KA+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 MAX6369KA+T reliable?
The price and inventory of MAX6369KA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6369KA+T is usually 5 days.
3.What payment methods are accepted for MAX6369KA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6369KA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6369KA+T?
MAX6369KA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6369KA+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 MAX6369KA+T?
For technical support, including MAX6369KA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6369KA+T requirements.
6.How does Aetrix verify that MAX6369KA+T is sourced from the original manufacturer or authorized distributors?
All MAX6369KA+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 MAX6369KA+T meets industry standards.
7.What is the process for return or replacement of MAX6369KA+T?
All MAX6369KA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6369KA+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 MAX6369KA+T part is unused and in its original packaging.
Return procedure for MAX6369KA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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