The HC5523 is a subscriber line interface circuit which is interchangeable with Ericsson’s PBL3764A/4 for distributed central office applications. Enhancements include immunity to circuit latch-up during hot plug and absence of false signaling in the presence of longitudinal currents.

Features
• DI Monolithic High Voltage Process
• Programmable Current Feed (20mA to 60mA)
• Programmable Loop Current Detector Threshold and Battery Feed Characteristics
• Ground Key and Ring Trip Detection
• Compatible with Ericsson’s PBL3764A/4
• Thermal Shutdown
• On-Hook Transmission
• Wide Battery Voltage Range (-24V to -58V)
• Low Standby Power
• Meets TR-NWT-000057 Transmission Requirements
• -40°C to 85°C Ambient Temperature Range

Applications
• Digital Loop Carrier Systems
• Pair Gain
• Fiber-In-The-Loop ONUs
• POTS
• Wireless Local Loop
• PABX
• Hybrid Fiber Coax
• Related Literature
    - AN9632, Operation of the HC5523/15 Evaluation Board