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MAX253 - Transformer Driver

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.

Key Features

  • o Power-Supply Transformer Driver for Isolated RS-485/RS-232 Data-Interface.

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Other Datasheets by Maxim Integrated (now Analog Devices)

Part Number Description
MAX250 +5V Powered Isolated RS-232 Drivers/Receivers
MAX251 +5V Powered Isolated RS-232 Drivers/Receivers
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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
19-0226; Rev 0; 1/94 Transformer Driver for Isolated RS-485 Interface _______________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. 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-beforemake action between the two switches.