DESCRIPTION
The LTC®1334 is a low power CMOS bidirectional transceiver featuring two reconfigurable interface ports. It can be configured as two RS485 differential ports, as two dual RS232 single-ended ports or as one RS485 differential port and one dual RS232 single-ended port. An onboard charge pump requires four 0.1µF capacitors to generate boosted positive and negative supplies, allowing the RS232 drivers to meet the RS232 ±5V output swing requirement with only a single 5V supply. A shutdown mode reduces the ICC supply current to 10µA.

FEATURES
■ Four RS232 Transceivers or Two RS485 Transceivers on One Chip
■ Operates from a Single 5V Supply
■ Withstands Repeated ±10kV ESD Pulses
■ Uses Small Charge Pump Capacitors: 0.1µF
■ Low Supply Current: 8mA Typical
■ 10µA Supply Current in Shutdown
■ Self-Testing Capability in Loopback Mode
■ Power-Up/Down Glitch-Free Outputs
■ Driver Maintains High Impedance in Three-State, Shutdown or with Power Off
■ Thermal Shutdown Protection
■ Receiver Inputs Can Withstand ±25V

APPLICATIONS
■ Low Power RS485/RS422/RS232/EIA562 Interface
■ Software-Selectable Multiprotocol Interface Port
■ Cable Repeaters
■ Level Translators