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