HC5521
Description
The HC5521 is a Monolithic Subscriber Line Interface Circuit (SLIC) for Analog Subscriber Line cards in Central Office and PABX switches.
Key Features
- Normal and Reversed DC Feed
- 30mA Current Limit
- Ringing, Test-In, and Test-Out Relay Drivers
- Ground Key Detector with Seperate Logic Output
- Thermal Shutdown Protection with Alert Signal
- On-Hook Transmission
- Selectable Transmit and Receive Gain Setting
- Selectable 2-Wire Impedance Matching
- Zero Crossing Ring Trip Detection and Ring Relay Release
- Parallel Digital Control and Status Monitoring
Applications
- PABX/CO Line Circuits
