The HC5549 Subscriber line interface circuit is a 100V diellectrically isolated bipolar integrated circuit for use in short loop ISDN, PABX and Pairgain applications. The HC5549 has been optimized for low power as required for battery backed remote terminals or for applications requiring emergency powering from the line such as European ISDN NT1+ designs.

Features
• Dual Battery Operation
• Single Additional +5V Supply
• Low Standby Power Consumption (48V, 35mW)
• On Hook Transmission
• Tip and Ring Disconnect
• Soft or Hard Polarity Reversal
• Supports 12kHz or 16kHz Pulse Metering
• Ring Relay Driver
• On Chip 2-wire AC/DC Loopback
• 0°C to 70°C or -40°C to 85°C Ambient Temp Range
• Low External Component Count
• Pb-Free Available (RoHS Compliant)

Applications
• ISDN NT1+ Terminals
• Pairgain Remote Termination
• PABX and Key Systems