Quad RS-232 Bus Transceiver, 9V, 300Kbps, 14-Pin SOIC
Quadruple Line Driver 14-SOIC 0 to 70
Quad Bus Transceiver, 300Kbps, 9V Dual Supply, Surface Mount
4-Channel Dual Supply Voltage 9V 34mA Surface Mount Bus Transceiver
SN75188DR-TI