SN75ALS1177NSR

The SN75ALS1177 and SN75ALS1178 dual differential drivers and receivers are ICs designed for bidirectional data communication over multipoint bus transmission lines. These devices are designed for balanced transmission lines and comply with TIA/EIA-422-B and TIA/EIA-485-A standards. The SN75ALS1177 integrates dual three-state differential line drivers and dual three-state differential-input line receivers, both operating from a single 5V supply. The drivers and receivers feature active-high and active-low enables, respectively, which can be externally connected together for use as direction control. Each SN75ALS1178 driver has an individual active-high enable. The failsafe design ensures the receiver output remains high when the receiver inputs are open. The SN75ALS1177 and SN75ALS1178 are rated for an operating temperature range of -0°C to 70°C.

Applications

• Motor drivers
• Factory automation
• Building automation

Key features

• Meets or exceeds TIA/EIA-422-B and TIA/EIA-485-A requirements
• Multipoint bus transmission over long buses in noisy environments
• Low supply current (50mA maximum)
• Driver positive and negative current limiting
• Driver common-mode output voltage range: −7V to 12V
• Thermal shutdown protection
• Driver three-state output, active-high enable
• Receiver common-mode input voltage range: −12V to 12V
• Receiver input sensitivity: ±200mV
• Receiver hysteresis: 50mV (typical)
• Receiver high input impedance: 12kΩ (minimum)
• Receiver three-state output, active-low enable (SN75ALS1177 only)
• Single 5V supply operation