Software-Selectable Multiprotocol Transceiver with Termination Features: Software-Selectable Transceiver Supports: RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21 TUV Telecom Services Inc. Certified NET1, NET2 and TBR2 Compliant On-Chip Cable Termination Pin Compatible with LTC1543 Complete DTE or DCE Port with LTC1544 Operates from Single 5V Supply Small Footprint