This package uses SOP. Thebuffer features 14 terminations that serve different purposes. 5V is the required supply voltageWith the electrical component, 14 pins are set. For the transceiver to be powered, it must have a minimum voltage of 4.5V. It's in the LINE RECEIVER interface IC category.
SN75C189NS Features
SN75C189NS Applications
There are a lot of Texas Instruments SN75C189NS Buffers & Transceivers applications.