Quad Line Receiver (276-2521) Features Faxback Doc. # 14283 The 1489 monolithic quad line RECEIVER is designed to interface data terminal equipment with data communications equipment in conformance with the specifications of EIA Standard No. RS-232C. Fully interchangeable with MC1489, SN75189, DS1489, XR1489, etc. FEATURES: Input Resistance - 3.0k to 7.0 kilohms Input Signal Range - +30 Volts Input Threshold Hysteresis Built In Response Control a) Logic Threshold Shifting b) Input Noise Filtering (TK/all-03/20/95)