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Description

FULL DATA SHEET (PDF, 832kB) Download   E-Mail 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. The MAX253 consists of a CMOS oscillator driving a pair of N-channel power switches. The oscillator runs at double the output frequency, driving a toggle flip-flop to ensure 50% duty cycle to each of the switches. Internal delays are arranged to ensure break-before-make action between the two switches. The SD pin puts the entire device into a low-power shutdown state, disabling both the power switches and oscillator.

Key Features		Applications/Uses
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		Bridge Ground Differentials High Noise-Immunity Communications Interface Isolated and/or High-Voltage Power Supplies Isolated RS-485/RS-232 Power Supply Medical Equipment Process Control Transformer Driver

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