Maxim Integrated (MAX253CSA+) Transformer Driver for RS232, RS485

Product Overview The MAX253CSA+ is a simple power-supply Transformer Driver for isolated RS-485/RS-232 data-interface applications. The device drives a centre-tapped transformer primary from a 5 or 3.3VDC 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. 0.4µA Low-current shutdown mode Applications Power Management, Communications & Networking, Medical, Automation & Process Control Product Information Device Type: Transformer Driver IC Interface Type: RS232, RS485 No. of Drivers: 1Drivers Supply Voltage Min: -300mV Supply Voltage Max: 7V Driver Case Style: SOIC No. of Pins: 8Pins Operating Temperature Min: 0°C Operating Temperature Max: 70°C Product Range: - Automotive Qualification Standard: - MSL: MSL 1 - Unlimited