DS1834AS+ – DALLAS

Overview

The Analog Devices Inc./Maxim Integrated DS1834AS+ is a robust dual-channel multi-voltage supervisor IC, primarily designed for critical system reset generation. Its core function is to monitor two distinct voltage rails (3.3V and 5V) and assert an active-low reset signal when either voltage falls below a predefined threshold, ensuring system integrity during power-up or brownout conditions. A key design consideration often overlooked is the trade-off between the reset timeout period (200ms minimum) and the potential for premature reset in systems with slow-charging decoupling capacitors; engineers must carefully select appropriate capacitor values to avoid spurious resets while guaranteeing timely system initialization.

Key Features

• Dual voltage monitoring (3.3V, 5V)
• Open-drain/open-collector output for flexible interfacing
• 200ms minimum reset timeout
• Active-low reset signal
• Operating temperature range: -40°C to 85°C
• 8-SOIC surface mount package (3.90mm width)

Applications

The component is engineered for deployment in systems requiring high reliability and performance under specific operating conditions. It provides functional stability across the stated design envelope.

• Power sequencing and reset generation for embedded microcontrollers
• System supervision in industrial control equipment
• Voltage monitoring for battery-backed systems
• Ensuring reliable boot-up in consumer electronics