"The DS1489/DS1489A are quad line receivers designed to interface data terminal equipment with data communications equipment. They are constructed on a single monolithic silicon chip. These devices satisfy the specifications of EIA Standard RS-232D. The DS1489/DS1489A meet and exceed the specifications of MC1489/MC1489A and are pin-for-pin replacements.

Features

Four separate receivers per package
Programmable threshold
Built-in input threshold hysteresis
“Fail safe” operating mode: high output for open inputs
Inputs withstand ± 30V
"