General Description

The MAX253 is a monolithic oscillator/power-driver, specifically designed to provide isolated power for an isolated RS-485 or RS-232 data interface. It 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.

Features

♦ Power-Supply Transformer Driver 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

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