The SP301 and SP302 are proprietary single-chip devices that contain both RS-232 and RS-422 protocol line drivers and receivers. Their configuration may be changed at any time by logic levels on two control lines. In any configuration, both the SP301 and SP302 fully meet the requirements of the EIA RS-232D and RS-422 data communication standards. A loopback test mode is provided.The SP301 and SP302 are available in 24-pin single width plastic, and 28-pin SOIC packages for commercial and industrial temperature range operation.