(rs-422/rs-423) Line Drivers With Tri-state Outputs - National Semiconductor

The DS1691A DS3691 are low power Schottky TTL line driv- ers designed to meet the requirements of EIA standards RS-422 and RS-423. They feature 4 buffered outputs with high source and sink current capability with internal short cir- cuit protection. A mode control input provides a choice of op- eration either as 4 single-ended Line Drivers or 2 differential Line Drivers A rise time control pin allows the use of an exter- nal capacitor to slow the rise time for suppression of near end crosstalk to other receivers in the cable. Rise time ca- pacitors are primarily intended for waveshaping output sig- nals in the single-ended driver mode. Multipoint applications in differential mode with waveshaping capacitors is not al- lowed. With the mode select pin low, the DS1691A DS3691 are dual-differential Line Drivers with TRI-STATE outputs. They feature 10V output common-mode range in TRI-STATE mode and 0V output unbalance when operated with 5V supply. By National Semiconductor Corporation