Overview
The MAX6369KA+T is a pin-selectable watchdog timer designed by Analog Devices Inc./Maxim Integrated to supervise microprocessor (μP) activity and signal when a system is operating improperly. This component is part of the MAX6369–MAX6374 series, which are tailored for critical μP and microcontroller (μC) monitoring. During normal operation, the microprocessor must repeatedly toggle the watchdog input (WDI) before the selected watchdog timeout period elapses to ensure the system is processing code correctly. If the μP fails to provide a valid watchdog input transition before the timeout period expires, the supervisor asserts a watchdog (active-low WDO) output to signal processing errors, which can be used to reset the μP or interrupt the system.
Key Specifications
| Parameter | Symbol | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|---|
| Operating Voltage Range | VCC | 2.5 | 5.5 | V | ||
| Supply Current | ICC | No load, TA = -40°C to +85°C | 8 | 20 | µA | |
| No load, TA = -40°C to +125°C | 10 | 22 | µA | |||
| Input High Voltage | VIH | WDI, SET0, SET1, SET2 | 0.8 x VCC | V | ||
| Input Low Voltage | VIL | VCC ≥ 3.3V, TA = -40°C to +85°C | 0.8 VCC | V | ||
| VCC ≥ 3.3V, TA = -40°C to +125°C | 0.6 VCC | V | ||||
| VCC ≥ 2.5V, TA = -40°C to +85°C | 0.6 VCC | V | ||||
| VCC ≥ 2.5V, TA = -40°C to +125°C | 0.4 VCC | V | ||||
| Watchdog Timeout Period | tWD | VSET2 = 0V, SET1 = 0V, SET0 = VCC | 300 | 900 | ms | |
| Startup Delay Period | tDELAY | VSET2 = 0V, SET1 = 0V, SET0 = VCC | 3 | 9 | s | |
| Operating Temperature | TA | -40 | 125 | °C | ||
| Package Type | SOT23-8 |
Key Features
- Pin-selectable watchdog timeout periods and startup delay periods
- Ability to change watchdog timing characteristics without power cycling
- Open-drain or push-pull pulsed active-low watchdog output
- Watchdog timer disable feature
- Low supply current of 8µA
- No external components required
- Miniature 8-pin SOT23 package
- AEC-Q100 qualified for automotive applications (specific models)
Applications
- Embedded Control Systems
- Industrial Controllers
- Automotive Systems
- Communications & Networking
- Computers & Computer Peripherals
Q & A
- What is the primary function of the MAX6369KA+T? The MAX6369KA+T is a watchdog timer that supervises microprocessor activity and signals when a system is operating improperly.
- What is the operating voltage range of the MAX6369KA+T? The operating voltage range is from 2.5V to 5.5V.
- What types of watchdog output does the MAX6369KA+T support? It supports both open-drain and push-pull pulsed active-low watchdog outputs.
- Can the watchdog timing characteristics be changed without power cycling? Yes, the watchdog timing characteristics can be changed without power cycling.
- What is the typical supply current of the MAX6369KA+T? The typical supply current is 8µA.
- Does the MAX6369KA+T require external components? No, it does not require any external components.
- What is the package type of the MAX6369KA+T? It is available in an 8-pin SOT23 package.
- Is the MAX6369KA+T qualified for automotive applications? Yes, specific models are AEC-Q100 qualified for automotive applications.
- What are the typical applications of the MAX6369KA+T? Typical applications include embedded control systems, industrial controllers, automotive systems, communications & networking, and computers & computer peripherals.
- What is the operating temperature range of the MAX6369KA+T? The operating temperature range is from -40°C to +125°C.
