MAX250CSD+

MAX250CSD+ is a 5V, isolated, RS-232 driver/receiver. By combining many functions on two chips, the cost and complexity required for an isolated digital interface is greatly reduced. Four low-cost optocouplers, four capacitors, a diode and a small pot-core type transformer are all that are required to complete a 19.2k baud transceiver. Faster data rates are possible by using high-speed optocouplers. In addition to the driving and receiving circuitry for the optocouplers, the chipset includes a push-pull transformer driver to supply power to the interface's isolated side. Other convenient features include single +5V operation, a low power shutdown mode, and output-enabling control for three-state operation. Applications include bridge ground differentials, data links to analogue circuits, high-noise data communications, and industrial communications.

• Isolated data interface, single +5V supply
• Uses low cost optocouplers
• 5µW power shutdown, 2 transmitters and 2 receivers
• Operating supply current is 0.1mA typ at D1, D2 open
• Shutdown supply current is 1µA typ at TA=-40 to 85°C
• Switch frequency is 200kHz typ at VCC=5V, TA=25°C
• Current output source is -8mA typ at Vout=1.4V, TA=25°C
• Leakage current is 10µA maximum
• 14 lead SO package
• Temperature range from 0°C to +70°C

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