L7557 Description
These electronic subscriber loop interface circuits (SLICs) are optimized for low power consumption while providing an extensive set.
L7557 Key Features
- Forward powerup
- Disconnect (high impedance)
- 2-wire wink (zero loop voltage)
- Off-hook detector with longitudinal rejection
- Ground key detector
- Ring trip detector
- dc feed resistance
- Loop current limit
- Termination impedance