The SP705CU/TR is a supervisory circuit manufactured by Exar Corporation. It is designed to monitor voltage levels in electronic systems and provide a reset signal to microprocessors or microcontrollers when the supply voltage drops below a predetermined threshold. This ensures proper system initialization and prevents data corruption or erratic behavior caused by insufficient voltage.

Applications

• Microprocessor-based systems
• Embedded systems
• Industrial control equipment
• 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 malfunctions 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 SP705CU/TR monitors voltage levels and asserts a reset signal when the voltage falls below the specified threshold. After the voltage rises above the threshold and remains stable for a specified delay period, the reset signal is de-asserted, allowing the microprocessor to begin operation. This device may incorporate a watchdog timer, which monitors the microprocessor's activity. If the microprocessor fails to periodically toggle the watchdog input within a defined time window, the SP705CU/TR will assert a reset signal, preventing system lockups. A manual reset input can be present allowing an external signal to trigger a reset. The active-low reset output remains asserted (low) as long as the supply voltage is below the threshold, the watchdog timer has timed out, or the manual reset input is asserted. 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, suitable for automated assembly. The exact specifications and available features can vary based on the specific configuration of the SP705 series.