The S-80819CNNB-B8E-T2 is a voltage detector IC manufactured by SII Semiconductor Corporation. It's designed to monitor the input voltage and generate a reset signal when the voltage drops below a specified threshold. This is crucial for ensuring the stable operation of microcontrollers, CPUs, and other sensitive digital circuits by preventing data corruption and system malfunctions caused by voltage fluctuations.

Applications

• Microcontroller Reset: Provides a reliable reset signal during power-up, power-down, and brown-out conditions.
• CPU Reset: Ensures the proper functioning of CPUs by providing a reliable reset signal.
• Memory Protection: Prevents data corruption in volatile memory by initiating a reset when the voltage is insufficient.
• Power Supply Monitoring: Monitors the power supply voltage and provides an alert if it falls below a safe level.
• Battery-Powered Devices: Prevents deep discharge of batteries by shutting down the device when the battery voltage is low.

Features

• Detection Voltage: 1.9V (Inferred from '19' in the part number 'S-80819CNNB').
• High-Precision Detection: Ensures accurate and reliable voltage monitoring.
• Ultra-Low Current Consumption: Minimizes power consumption, extending battery life in portable devices.
• Small Package: Available in compact packages for space-saving designs.
• Built-in Hysteresis: Prevents output chattering due to noise around the detection threshold.
• N-channel Open Drain Output: Provides flexibility in interfacing with various logic levels and microcontrollers.

Benefits

• Enhanced System Reliability: Prevents system crashes and data corruption caused by voltage drops.
• Extended Battery Life: Low current consumption maximizes battery runtime in portable devices.
• Simplified Circuit Design: Requires minimal external components.
• Reduced Board Space: Compact package size allows for smaller and more efficient designs.
• Improved System Stability: Provides a stable and reliable reset signal.

The S-80819CNNB-B8E-T2 operates by continuously monitoring the input voltage. When the voltage falls below the specified detection threshold of 1.9V, the N-channel open drain output is activated, typically pulling the reset line low (an external pull-up resistor is required). The output remains low until the voltage rises above the threshold plus the hysteresis voltage. The hysteresis prevents the output from oscillating due to minor voltage fluctuations near the threshold. This voltage detector is suitable for a wide range of applications where reliable voltage monitoring is crucial.