DESCRIPTION

The LTC®1387 is a low power reconfigurable CMOS bidirectional transceiver. It can be configured as an RS485 differential port or as two RS232 single-ended ports. An onboard charge pump uses four 0.1µF capacitors to generate boosted positive and negative supplies, allowing the RS232 drivers to meet ±5V output swing requirements with only a single 5V supply. A shutdown mode reduces the ICC supply current to 5µA

FEATURES

■ Two RS232 Transceivers or One RS485 Transceiver
■ Operates from a Single 5V Supply
■ Guaranteed Receiver Output with Inputs Floating or Shorted to Ground
■ Logic Selectable Fast/Slow RS485 Driver Slew Rate
■ Low Supply Current: 7mA Typical
■ 5µA Supply Current in Shutdown
■ Self-Testing Capability in Loopback Mode
■ Separate Driver and Receiver Enable Controls
■ Driver Maintains High Impedance in Three-State, Shutdown or with Power Off
■ Receiver Inputs Can Withstand ±25V

APPLICATIOUNS

■ Point-of-Sale Terminals
■ Software Selectable Multiprotocol Interface Ports
■ Low Power RS485/RS422/RS232/EIA562 Interface
■ Cable Repeaters
■ Level Translators