MAX3157EAI+

The MAX3157EAI+ is a high CMRR RS485 transceiver with ±50V isolation in 28 pin SSOP package. The high CMRR RS485/RS422 data communications interface providing ±50V isolation in a hybrid microcircuit. A single +5V supply on the logic side powers both sides of the interface with external ±50V capacitors transferring power from the logic side to the isolated side. Each MAX3157 contains one transmitter and one receiver and operates at a data rates up to 250Kbps. Drivers are short-circuit current limited and protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a high impedance state. The receiver input has a fail-safe feature that has a logic high receiver output if the inputs are open, shorted or connected to a terminated transmission line with all drivers disabled.

• Supply voltage range is 4.75V to 5.25V
• Operating temperature range from -40°C to 85°C
• Low cost replacement for opto-isolated transceivers
• True fail safe receiver while maintaining EIA/TIA485 compliance
• Pin selectable full/half duplex operation
• Phase controls to correct for twisted pair reversal
• Low power shutdown mode reduces supply current to 25μA
• 25mA of supply current when unloaded or when fully loaded with the driver disabled
• Slew rate limited reduced EMI

Applications

Communications & Networking, Industrial

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party