General Description
The MAX253 monolithic oscillator/power-driver is specifically designed to provide isolated power for an isolated RS-485 or RS-232 data interface. The device drives a center-tapped transformer primary from a 5V or 3.3V DC power supply. The secondary can be wound to provide any isolated voltage needed at power levels up to 1W.
Benefits and Features
• Simple Power-Supply Transformer Driver Design for Isolated RS-485/RS-232 Data-Interface Applications
• Single 5V or 3.3V Supply
• Low-Current Shutdown Mode: 0.4µA
• Pin-Selectable Frequency: 350kHz or 200kHz
• 8-Pin DIP, SO, and µMAX® Packages Take Minimal Board Space
APPLICATIONs
Isolated RS-485/RS-232 Power-Supply Transformer Driver
High Noise-Immunity Communications Interface
Isolated and/or High-Voltage Power Supplies
Bridge Ground Differentials
Medical Equipment
Process Control