DS36276

DS36276 FAILSAFE Multipoint Transceiver July 1998 DS36276 FAILSAFE Multipoint Transceiver General Description The DS36276 FAILSAFE Multipoint Transceiver is designed for use on bi-directional differential busses. It is compatible with existing TIA/EIA-485 transceivers, however, it offers an additional feature not supported by standard transceivers. The FAILSAFE feature guarantees the receiver output to a known state when the Interface is in the following conditions: Floating Line, Idle Line (no active drivers), and Line Fault conditions (open or short). The receiver output is in a HIGH state for the following conditions: OPEN Inputs, Terminated Inputs (50Ω), and SHORTED Inputs. FAILSAFE is a highly desirable feature when the transceivers are used with Asynchronous Controllers such as UARTs. Features n FAILSAFE receiver, RO = HIGH for: — OPEN inputs — Terminated inputs — SHORTED inputs n Compatible with popular interface standards: — TIA/EIA-485 (RS-485) — TIA/EIA-422-A (RS-422-A) — CCITT Recommendation V.11 n Bi-Directional Transceiver — Designed for multipoint transmission n Separate driver input, driver enable, receiver enable, and receiver output for maximum flexibility n Wide bus common mode range — (−7V to +12V) n Pin compatible with: DS75176B, DS96176, DS3695 and SN75176A and B n Available in SOIC package Connection and Logic Diagram Truth Tables Driver Inputs RE X X X DE H H L DI H L X H L Z Outputs DO/RI DO /RI L H Z DS011383-1 Receiver Inputs RE L L H DE L L X...