应用功能： 四施密特可控线路驱动器 MC1489, MC1489A, SN55189, SN55189A, SN75189, SN75189AThese devices are monolithic low-power Schottkyquadruple line receivers designed to satisfy the requirements of the standard interface between data-terminal equipment and data-communication equipment as defined by TIA/EIA-232-F.
