SN75ALS1177 Datasheet | Texas Instruments

Features - Meet or exceed standards TIA/EIA-422-B and TIA/EIA-485-A - Designed for multipoint bus transmission on long bus lines in noisy environments - Low supply-current requirement 50m A maximum - Driver positive-and negative-current limiting - Driver mon-mode output voltage range of - 7V to 12V - Thermal shutdown protection driver 3-state outputs active-high enable - Receiver mon-mode input voltage range of - 12V to 12V - Receiver input sensitivity: ±200m V - Receiver hysteresis: 50m V typical - Receiver high input impedance: 12kΩ minimum - Receiver 3-state outputs active-low enable for SN75ALS1177 only - Operate from single 5V supply 2 Applications - Motor Drives - Factory Automation - Building Automation 3 Description The SN75ALS1177 and SN75ALS1178 dual differential drivers and receivers are integrated circuits designed for bidirectional data munication on multipoint bus transmission lines. The devices are designed for balanced transmission lines, and meet standards TIA/EIA-422-B and TIA/EIA-485-A. The SN75ALS1177 bines dual 3-state differential line drivers and dual 3-state differential input line receivers, both of which operate from a single 5V power supply. The drivers and receivers have activehigh and active-low enables, respectively, which can be externally connected together to function as direction control. The SN75ALS1178 drivers each have an individual active-high enable. Fail-safe design ensures that when the receiver inputs are open, the receiver outputs are always high. The SN75ALS1177 and SN75ALS1178 are characterized for operation from 0°C to 70°C. PART NUMBER SN75ALS1177 SN75ALS1178 Package Options PACKAGE(1) PACKAGE SIZE(2) SOP (NS, 16) 10.2mm × 7.8mm PDIP (N, 16) 19.3mm × 9.4mm (1) For more information, see Section 10. (2) The package size (length × width) is a nominal value and includes pins, where applicable. Logic Symbol† Logic Diagram (Positive Logic) † These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC...