The SP705CN-TR is a supervisory circuit manufactured by Exar Corporation. This device is designed to monitor voltage levels in a system and provide a reset signal to microprocessors or microcontrollers when the voltage falls below a certain threshold. This action ensures that the system starts up correctly and prevents data corruption or erroneous operation due to low voltage conditions.

Applications

• Microprocessor and microcontroller systems
• Embedded systems
• Industrial control systems
• Automotive electronics
• Portable devices

Features

• Precision voltage monitoring
• Power-on reset generation
• Low quiescent current
• Active-low reset output
• Watchdog timer (optional)
• Manual reset input (optional)

Benefits

• Prevents system malfunction due to low voltage
• Ensures reliable system startup
• Reduces the risk of data corruption
• Monitors program execution (with watchdog timer)
• Allows external reset (with manual reset input)
• Improves system reliability

Additional Details

The SP705CN-TR typically monitors a 5V or 3.3V power supply. When the supply voltage drops below the threshold, the reset output is asserted, holding the microprocessor in reset. Once the voltage rises above the threshold, the reset output is de-asserted after a specified delay, allowing the microprocessor to begin normal operation. The device may include a watchdog timer, which monitors the microprocessor's activity and asserts a reset if the microprocessor fails to strobe the watchdog input within a specified timeout period. A manual reset input may also be available, allowing for external reset initiation. The low quiescent current makes this IC suitable for battery-powered applications. The 'TR' suffix indicates that the device is supplied on tape and reel, facilitating automated assembly. The precise features and specifications may vary depending on the specific configuration of the SP705CN series.