MAX3157EAI+ Datasheet PDF - Maxim Integrated

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