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
(EN)
