The IMP813 is a supervisory circuit manufactured by IMP, Inc. It's primarily designed for monitoring voltage levels in microprocessor and digital systems. This device provides essential protection against power supply faults that can lead to system malfunction or data corruption.

Applications

• Microprocessor systems
• Digital signal processors (DSPs)
• Embedded systems
• Industrial control systems
• Consumer electronics

Features

• Precision voltage monitoring
• Power-on reset generation
• Watchdog timer (in some versions)
• Low quiescent current
• Small package options

Benefits

• Prevents system errors and data corruption due to voltage drops.
• Ensures proper system initialization with power-on reset.
• Improves system reliability and uptime.
• Simplifies system design by integrating multiple supervisory functions.
• Reduces board space requirements with compact packaging.

Additional Details

The IMP813 typically monitors a single voltage rail, such as 5V or 3.3V. When the monitored voltage falls below a specified threshold, the IMP813 asserts a reset signal. This reset signal can be used to inhibit microprocessor operation until the voltage returns to an acceptable level. The device also includes a power-on reset (POR) function that generates a reset signal during power-up to ensure that the system starts in a known state. Some versions incorporate a watchdog timer that monitors microprocessor activity and asserts a reset signal if the microprocessor fails to respond within a specified time period. The IMP813 is available in various package options, including SOT-23 and TSSOP, to suit different board space constraints. Supply voltage ranges typically from 2.5V to 5.5V, and reset threshold voltages are available for common logic levels. The device operates over a wide temperature range, typically -40°C to +85°C, making it suitable for industrial and automotive applications. The low quiescent current minimizes power consumption and extends battery life in portable applications.