Texas Instruments TPS3823-33DBVR Supply Voltage Supervisor IC SOT-23-5

Texas Instruments TPS3823-33DBVR Supply Voltage Supervisor IC provides a fixed 200 ms reset delay for reliable system initialisation in DSP and processor-based designs. This compact supervisor integrates a watchdog timer and a manual reset input, supporting circuit initialisation and timing supervision where controlled start-up is essential.

Overview

On power-on, the RESET output asserts low once the supply voltage (VDD) exceeds 1.1V. The device continuously monitors VDD and holds RESET active whenever the voltage falls below the precise threshold (VIT-). After the fixed 200 ms delay, the output returns to its inactive high state, supporting stable operation with noisy or slowly rising power supplies.

Watchdog Timer

The integrated watchdog timer must be periodically triggered by transitions at the Watchdog Input (WDI) pin. If the supervising microcontroller does not retrigger it within the set timeout interval, the device asserts a reset pulse, helping to recover the system from a software hang or fault condition. This makes the IC suitable for critical applications where uptime is important.

Key Features

• Power-on reset generator with a fixed 200 ms delay
• Manual reset input for user-initiated system restarts
• Active-low reset output
• Integrated watchdog timer for system health monitoring
• Ultra-low 15µA typical supply current
• Manufactured without antimony or brominated flame retardants (no Sb/Br)

Package and Supply Range

The device is offered in a compact, surface-mount SOT-23-5 package. It supports a wide supervision range, with variants available for 2.5V, 3V, 3.3V, and 5V systems. Its low typical supply current of 15µA makes it suitable for power-sensitive portable devices.

This IC provides a fundamental building block for enhancing system integrity.