DS1487

Voltage on Any Pin Relative to Ground -0.5V to +7.0V
Storage Temperature -40°C to +85°C
Soldering Temperature DIP: 260°C for 10 seconds (See Note 12) See IPC/JEDEC Standard J-STD-020A for Surface Mount Devices

* This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.

The DS1487 is a low-power transceiver for RS-485 and RS-422 communication. The device contains one driver and one receiver. The drivers slew rate allows for operation up to 2.0 Mbps (see Applications Information section). The trans-ceiver presents 1⁄4 unit loading to the RS-485 bus allowing up to 128 nodes to be connected together without the use of re-peaters.

The transceiver DS1487 draws 200 µA of supply current when un-loaded or fully loaded with the driver disabled and operates from a single +5V supply.

The driver DS1487 is short-circuit current limited and is protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into TRI-STATE® (High Impedance state) under fault conditions. The driver guarantees a minimum of 1.5V differential output voltage with maximum loading across the common mode range (VOD3).

The receiver DS1487 has a failsafe feature that guarantees a logic-high output if the input is open circuit. The DS1487 is available in surface mount and DIP pack-ages.