The CAT823TTDI-G is a supervisory circuit from Catalyst Semiconductor (now part of ON Semiconductor) designed to monitor voltage levels in electronic systems. It provides a reset signal to microcontrollers or other digital circuits when the supply voltage drops below a specified threshold, preventing erroneous operation and ensuring system integrity. The device offers a combination of precision voltage monitoring, low power consumption, and small package size, making it suitable for a wide range of applications.

Applications

• Microcontroller Reset Circuitry.
• Power-On Reset (POR) Functionality.
• Voltage Monitoring in Embedded Systems.
• Portable Devices.
• Industrial Control Systems.

Features

• Precision voltage monitoring with a fixed threshold.
• Active-low reset output.
• Open-drain or push-pull reset output options.
• Low supply current.
• Small SOT-23 or similar package.
• RoHS compliant.

Benefits

• Prevents microcontroller malfunction due to voltage drops.
• Ensures reliable system startup.
• Simplifies power management design.
• Low power consumption extends battery life in portable devices.
• Small size allows for compact designs.

Additional Details

The CAT823TTDI-G monitors a specific supply voltage, typically 3.3V or 5V, with a precise threshold voltage. When the supply voltage falls below this threshold, the reset output is asserted (driven low). The reset output remains asserted until the supply voltage rises above the threshold and a certain reset timeout period has elapsed. The reset timeout period ensures that the microcontroller has sufficient time to initialize before normal operation begins. The device consumes very little current, making it suitable for battery-powered applications. The CAT823TTDI-G is commonly available in a small SOT-23 package, minimizing board space requirements. It's essential to select the correct threshold voltage and reset timeout period for the specific application. This supervisory circuit is a crucial component in many embedded systems, ensuring reliable and predictable operation.